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HomeMy WebLinkAboutDrainage Report 051324 DRAINAGE REPORT 12420 Chicot Road Date: 04-16-2024 Located in: Little Rock, Arkansas Prepared for: City of Little Rock, Arkansas Prepared by: PHILLIP LEWIS ENGINEERING, INC. Structural/Civil Design 23620 Interstate 30 N Bryant, Arkansas 72022 CERTIFICATION I hereby state that this Final Drainage has been prepared by me or under my supervision and meets the standard of care and expertise which is usual and customary in this community of professional engineers. The analysis has been prepared utilizing procedures and practices by the City of Little Rock and within the standard accepted practices. ____________________________________ DATE: 04-16-2024 Phillip A. Lewis, PE. PHILLIP LEWIS ENGINEERING, INC. Structural/Civil Design 23620 Interstate 30 N Bryant, Arkansas 72022 INTRODUCTION Owner, Developer, Engineer Owner: Romero’s Enterprises LLC 15 Valley Ct Little Rock, AR 72204 Developer/Authorized Agent: Romero’s Enterprises LLC 15 Valley Ct Little Rock, AR 72204 Engineer: Phillip Lewis Engineering, Inc. Structal + Civil Consultants Attn: Phillip Lewis, P.E. 23620 Interstate 30 Bryant, Arkansas 72022 (501) 350-9840 plewisengineering@yahoo.com PHILLIP LEWIS ENGINEERING, INC. Structural/Civil Design 23620 Interstate 30 N Bryant, Arkansas 72022 Location The project lies within the City of Little Rock Planning department jurisdiction and is within city limits of Little Rock. The property is located at the corner of Bunch Road and Chicot Road. Project Vicinity Map: Description of Property The site work consists of platting 7 Single-Family residential lots. The existing ground coverage for the Drainage Basin consists of existing grass cover, C = 0.22 Sandy Loam (per the Little Rock Stormwater Management and Drainage Manual). According to FEMA Flood Insurance Rate Map 05119C0463G, the property is not within a Flood Hazard area, Floodways, or other flood areas. The property falls in Zone X, areas determined to be outside the 0.2% annual chance floodplain. A copy of the map can be found within the supplemental information attached to this report. PHILLIP LEWIS ENGINEERING, INC. Structural/Civil Design 23620 Interstate 30 N Bryant, Arkansas 72022 Drainage Criteria & Design In accordance with requirements of the City of Little Rock, the proposed developments drainage plan and this Drainage Report were developed with the criteria established in Little Rock Stormwater Management and Drainage Manual provided on LittleRock.gov. The site is being treated as two drainage basins, with one collecting in a dry detention basin. This detention basin has a single, controlled, discharge. All drainage calculations were performed using HydroCAD software to determine and analyze the changes in stormrunoff volume and flow rates, as well as, to appropriately design and size the outlet release structure for each detention basin. Calculations were performed using the Rational Method, using NOAA rainfall data, and the pond volume and outlet structure was determined by the 25-year storm event while the outlet structure is designed to match or reduce pre-development flow rates for all storm events: 2-yr, 5-yr, 10-yr, 25-yr and 100-yr storms. The designed detention basin lies in the middle of the original parcel, alond the south side of the creek. This creeks splits the property and no development is proposed north of this creek. The basin has a total calculated capacity of 3,977 cf at a rim elevation of 284.00’. Stormwater is then throttled through a low flow orifice (3” diameter) to bring each storm discharge under pre-development rates. After throttling through the 3” orifice, stormwater is then relased to the adjacent creek by a 12” HDPE culvert. The designed outlet structure can be found within the supplemental information attached to this report. The comparison between pre-development and post-development runoff are summarised below: Final Run-off Calculations Storm Frequency Pre-Dev Runoff (cfs) Post-Dev Discharge (cfs) 2 yr 1.91 1.80 5 yr 2.27 2.11 10 yr 2.56 2.35 25 yr 2.95 2.69 100 yr 3.50 3.17 PHILLIP LEWIS ENGINEERING, INC. Structural/Civil Design 23620 Interstate 30 N Bryant, Arkansas 72022 Pre-Development Hydrographs AR - Little Rock 2-yr Duration=10 min, Inten=4.36 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment A1: Drainage Basin A1 Runoff = 1.91 cfs @ 0.14 hrs, Volume= 1,147 cf, Depth= 0.16" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs AR - Little Rock 2-yr Duration=10 min, Inten=4.36 in/hr Area (sf) C Description 86,233 0.22 PERVIOUS 86,233 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.6 100 0.0670 0.36 Sheet Flow, Overland Flow Range n= 0.130 P2= 4.32" 0.3 20 0.0570 1.19 Shallow Concentrated Flow, Concentrated Overland Flow Woodland Kv= 5.0 fps 1.9 159 0.0800 1.41 Shallow Concentrated Flow, Concentrated Overland Flow Woodland Kv= 5.0 fps 1.3 78 0.0390 0.99 Shallow Concentrated Flow, Concentrated Overland Flow Woodland Kv= 5.0 fps 8.1 357 Total Subcatchment A1: Drainage Basin A1 Runoff Hydrograph Time (hours) 3210Flow (cfs)2 1 0 AR - Little Rock 2-yr Duration=10 min, Inten=4.36 in/hr Runoff Area=86,233 sf Runoff Volume=1,147 cf Runoff Depth=0.16" Flow Length=357' Tc=8.1 min C=0.22 1.91 cfs AR - Little Rock 5-yr Duration=10 min, Inten=5.17 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment A1: Drainage Basin A1 Runoff = 2.27 cfs @ 0.14 hrs, Volume= 1,362 cf, Depth= 0.19" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs AR - Little Rock 5-yr Duration=10 min, Inten=5.17 in/hr Area (sf) C Description 86,233 0.22 PERVIOUS 86,233 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.6 100 0.0670 0.36 Sheet Flow, Overland Flow Range n= 0.130 P2= 4.32" 0.3 20 0.0570 1.19 Shallow Concentrated Flow, Concentrated Overland Flow Woodland Kv= 5.0 fps 1.9 159 0.0800 1.41 Shallow Concentrated Flow, Concentrated Overland Flow Woodland Kv= 5.0 fps 1.3 78 0.0390 0.99 Shallow Concentrated Flow, Concentrated Overland Flow Woodland Kv= 5.0 fps 8.1 357 Total Subcatchment A1: Drainage Basin A1 Runoff Hydrograph Time (hours) 3210Flow (cfs)2 1 0 AR - Little Rock 5-yr Duration=10 min, Inten=5.17 in/hr Runoff Area=86,233 sf Runoff Volume=1,362 cf Runoff Depth=0.19" Flow Length=357' Tc=8.1 min C=0.22 2.27 cfs AR - Little Rock 10-yr Duration=10 min, Inten=5.83 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment A1: Drainage Basin A1 Runoff = 2.56 cfs @ 0.14 hrs, Volume= 1,534 cf, Depth= 0.21" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs AR - Little Rock 10-yr Duration=10 min, Inten=5.83 in/hr Area (sf) C Description 86,233 0.22 PERVIOUS 86,233 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.6 100 0.0670 0.36 Sheet Flow, Overland Flow Range n= 0.130 P2= 4.32" 0.3 20 0.0570 1.19 Shallow Concentrated Flow, Concentrated Overland Flow Woodland Kv= 5.0 fps 1.9 159 0.0800 1.41 Shallow Concentrated Flow, Concentrated Overland Flow Woodland Kv= 5.0 fps 1.3 78 0.0390 0.99 Shallow Concentrated Flow, Concentrated Overland Flow Woodland Kv= 5.0 fps 8.1 357 Total Subcatchment A1: Drainage Basin A1 Runoff Hydrograph Time (hours) 3210Flow (cfs)2 1 0 AR - Little Rock 10-yr Duration=10 min, Inten=5.83 in/hr Runoff Area=86,233 sf Runoff Volume=1,534 cf Runoff Depth=0.21" Flow Length=357' Tc=8.1 min C=0.22 2.56 cfs AR - Little Rock 25-yr Duration=10 min, Inten=6.72 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment A1: Drainage Basin A1 Runoff = 2.95 cfs @ 0.14 hrs, Volume= 1,769 cf, Depth= 0.25" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs AR - Little Rock 25-yr Duration=10 min, Inten=6.72 in/hr Area (sf) C Description 86,233 0.22 PERVIOUS 86,233 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.6 100 0.0670 0.36 Sheet Flow, Overland Flow Range n= 0.130 P2= 4.32" 0.3 20 0.0570 1.19 Shallow Concentrated Flow, Concentrated Overland Flow Woodland Kv= 5.0 fps 1.9 159 0.0800 1.41 Shallow Concentrated Flow, Concentrated Overland Flow Woodland Kv= 5.0 fps 1.3 78 0.0390 0.99 Shallow Concentrated Flow, Concentrated Overland Flow Woodland Kv= 5.0 fps 8.1 357 Total Subcatchment A1: Drainage Basin A1 Runoff Hydrograph Time (hours) 3210Flow (cfs)3 2 1 0 AR - Little Rock 25-yr Duration=10 min, Inten=6.72 in/hr Runoff Area=86,233 sf Runoff Volume=1,769 cf Runoff Depth=0.25" Flow Length=357' Tc=8.1 min C=0.22 2.95 cfs AR - Little Rock 100-yr Duration=10 min, Inten=7.98 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment A1: Drainage Basin A1 Runoff = 3.50 cfs @ 0.14 hrs, Volume= 2,101 cf, Depth= 0.29" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs AR - Little Rock 100-yr Duration=10 min, Inten=7.98 in/hr Area (sf) C Description 86,233 0.22 PERVIOUS 86,233 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.6 100 0.0670 0.36 Sheet Flow, Overland Flow Range n= 0.130 P2= 4.32" 0.3 20 0.0570 1.19 Shallow Concentrated Flow, Concentrated Overland Flow Woodland Kv= 5.0 fps 1.9 159 0.0800 1.41 Shallow Concentrated Flow, Concentrated Overland Flow Woodland Kv= 5.0 fps 1.3 78 0.0390 0.99 Shallow Concentrated Flow, Concentrated Overland Flow Woodland Kv= 5.0 fps 8.1 357 Total Subcatchment A1: Drainage Basin A1 Runoff Hydrograph Time (hours) 3210Flow (cfs)3 2 1 0 AR - Little Rock 100-yr Duration=10 min, Inten=7.98 in/hr Runoff Area=86,233 sf Runoff Volume=2,101 cf Runoff Depth=0.29" Flow Length=357' Tc=8.1 min C=0.22 3.50 cfs PHILLIP LEWIS ENGINEERING, INC. Structural/Civil Design 23620 Interstate 30 N Bryant, Arkansas 72022 Post-Development Hydrographs B1 Drainage Basin B1 B2 Drainage Basin B2 DP-1 Detention Pond Post Post-Dev Routing Diagram for Chicot Rd Subdivision Prepared by Phillip Lewis Engineering, Printed 4/17/2024 HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Subcat Reach Pond Link AR - Little Rock 2-yr Duration=10 min, Inten=4.36 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment B1: Drainage Basin B1 Runoff = 2.51 cfs @ 0.09 hrs, Volume= 1,502 cf, Depth= 0.32" Routed to Pond DP-1 : Detention Pond Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs AR - Little Rock 2-yr Duration=10 min, Inten=4.36 in/hr Area (sf) C Description 27,361 0.22 Sandy Loam 25,444 0.60 Residential Lot 3,710 0.98 Detention Pond 56,515 0.44 Weighted Average 52,805 93.44% Pervious Area 3,710 6.56% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.6 120 0.0500 3.35 Shallow Concentrated Flow, Flow around Residences Grassed Waterway Kv= 15.0 fps 0.4 103 0.0810 4.27 Shallow Concentrated Flow, Concentrated Overland Flow to Pond Grassed Waterway Kv= 15.0 fps 4.0 Direct Entry, Min TC Adustment 5.0 223 Total Subcatchment B1: Drainage Basin B1 Runoff Hydrograph Time (hours) 3210Flow (cfs)2 1 0 AR - Little Rock 2-yr Duration=10 min, Inten=4.36 in/hr Runoff Area=56,515 sf Runoff Volume=1,502 cf Runoff Depth=0.32" Flow Length=223' Tc=5.0 min C=0.44 2.51 cfs AR - Little Rock 2-yr Duration=10 min, Inten=4.36 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment B2: Drainage Basin B2 Runoff = 1.59 cfs @ 0.09 hrs, Volume= 951 cf, Depth= 0.38" Routed to Link Post : Post-Dev Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs AR - Little Rock 2-yr Duration=10 min, Inten=4.36 in/hr Area (sf) C Description 24,610 0.60 Single Family Lot 5,108 0.22 Sandy Loam 29,718 0.53 Weighted Average 29,718 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Minimum Subcatchment B2: Drainage Basin B2 Runoff Hydrograph Time (hours) 3210Flow (cfs)1 0 AR - Little Rock 2-yr Duration=10 min, Inten=4.36 in/hr Runoff Area=29,718 sf Runoff Volume=951 cf Runoff Depth=0.38" Tc=5.0 min C=0.53 1.59 cfs AR - Little Rock 2-yr Duration=10 min, Inten=4.36 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Summary for Pond DP-1: Detention Pond Inflow Area = 56,515 sf, 6.56% Impervious, Inflow Depth = 0.32" for 2-yr event Inflow = 2.51 cfs @ 0.09 hrs, Volume= 1,502 cf Outflow = 0.23 cfs @ 0.24 hrs, Volume= 1,451 cf, Atten= 91%, Lag= 9.1 min Primary = 0.23 cfs @ 0.24 hrs, Volume= 1,451 cf Routed to Link Post : Post-Dev Routing by Stor-Ind method, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Peak Elev= 282.58' @ 0.24 hrs Storage= 1,367 cf Plug-Flow detention time= 58.8 min calculated for 1,446 cf (96% of inflow) Center-of-Mass det. time= 59.0 min ( 66.5 - 7.5 ) Volume Invert Avail.Storage Storage Description #1 281.50' 3,977 cf Custom Stage Data Listed below Elevation Cum.Store (feet) (cubic-feet) 281.50 0 282.00 320 282.50 1,204 283.00 2,214 283.50 3,354 284.00 3,977 Device Routing Invert Outlet Devices #1 Primary 281.50'12.0" Round RCP_Round 12" L= 24.0' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 281.50' / 281.00' S= 0.0208 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 0.79 sf #2 Device 1 283.67'9.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) #3 Device 1 281.50'3.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.23 cfs @ 0.24 hrs HW=282.58' (Free Discharge) 1=RCP_Round 12" (Passes 0.23 cfs of 2.88 cfs potential flow) 2=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) 3=Orifice/Grate (Orifice Controls 0.23 cfs @ 4.71 fps) AR - Little Rock 2-yr Duration=10 min, Inten=4.36 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Pond DP-1: Detention Pond Inflow Primary Hydrograph Time (hours) 3210Flow (cfs)2 1 0 Inflow Area=56,515 sf Peak Elev=282.58' Storage=1,367 cf 2.51 cfs 0.23 cfs Pond DP-1: Detention Pond Primary Stage-Discharge Discharge (cfs) 543210Elevation (feet)284 283 282 RCP_Round 12" + Orifice/Grate Sharp-Crested Rectangular Weir AR - Little Rock 2-yr Duration=10 min, Inten=4.36 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond DP-1: Detention Pond Elevation (feet) Storage (cubic-feet) 281.50 0 281.52 13 281.54 26 281.56 38 281.58 51 281.60 64 281.62 77 281.64 90 281.66 102 281.68 115 281.70 128 281.72 141 281.74 154 281.76 166 281.78 179 281.80 192 281.82 205 281.84 218 281.86 230 281.88 243 281.90 256 281.92 269 281.94 282 281.96 294 281.98 307 282.00 320 282.02 355 282.04 391 282.06 426 282.08 461 282.10 497 282.12 532 282.14 568 282.16 603 282.18 638 282.20 674 282.22 709 282.24 744 282.26 780 282.28 815 282.30 850 282.32 886 282.34 921 282.36 956 282.38 992 282.40 1,027 282.42 1,063 282.44 1,098 282.46 1,133 282.48 1,169 282.50 1,204 282.52 1,244 Elevation (feet) Storage (cubic-feet) 282.54 1,285 282.56 1,325 282.58 1,366 282.60 1,406 282.62 1,446 282.64 1,487 282.66 1,527 282.68 1,568 282.70 1,608 282.72 1,648 282.74 1,689 282.76 1,729 282.78 1,770 282.80 1,810 282.82 1,850 282.84 1,891 282.86 1,931 282.88 1,972 282.90 2,012 282.92 2,052 282.94 2,093 282.96 2,133 282.98 2,174 283.00 2,214 283.02 2,260 283.04 2,305 283.06 2,351 283.08 2,396 283.10 2,442 283.12 2,488 283.14 2,533 283.16 2,579 283.18 2,624 283.20 2,670 283.22 2,716 283.24 2,761 283.26 2,807 283.28 2,852 283.30 2,898 283.32 2,944 283.34 2,989 283.36 3,035 283.38 3,080 283.40 3,126 283.42 3,172 283.44 3,217 283.46 3,263 283.48 3,308 283.50 3,354 283.52 3,379 283.54 3,404 283.56 3,429 Elevation (feet) Storage (cubic-feet) 283.58 3,454 283.60 3,479 283.62 3,504 283.64 3,528 283.66 3,553 283.68 3,578 283.70 3,603 283.72 3,628 283.74 3,653 283.76 3,678 283.78 3,703 283.80 3,728 283.82 3,753 283.84 3,778 283.86 3,803 283.88 3,827 283.90 3,852 283.92 3,877 283.94 3,902 283.96 3,927 283.98 3,952 284.00 3,977 AR - Little Rock 2-yr Duration=10 min, Inten=4.36 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Summary for Link Post: Post-Dev Inflow Area = 86,233 sf, 4.30% Impervious, Inflow Depth > 0.33" for 2-yr event Inflow = 1.80 cfs @ 0.16 hrs, Volume= 2,402 cf Primary = 1.80 cfs @ 0.16 hrs, Volume= 2,402 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Link Post: Post-Dev Inflow Primary Hydrograph Time (hours) 3210Flow (cfs)2 1 0 Inflow Area=86,233 sf 1.80 cfs 1.80 cfs AR - Little Rock 5-yr Duration=10 min, Inten=5.17 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment B1: Drainage Basin B1 Runoff = 2.98 cfs @ 0.09 hrs, Volume= 1,783 cf, Depth= 0.38" Routed to Pond DP-1 : Detention Pond Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs AR - Little Rock 5-yr Duration=10 min, Inten=5.17 in/hr Area (sf) C Description 27,361 0.22 Sandy Loam 25,444 0.60 Residential Lot 3,710 0.98 Detention Pond 56,515 0.44 Weighted Average 52,805 93.44% Pervious Area 3,710 6.56% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.6 120 0.0500 3.35 Shallow Concentrated Flow, Flow around Residences Grassed Waterway Kv= 15.0 fps 0.4 103 0.0810 4.27 Shallow Concentrated Flow, Concentrated Overland Flow to Pond Grassed Waterway Kv= 15.0 fps 4.0 Direct Entry, Min TC Adustment 5.0 223 Total Subcatchment B1: Drainage Basin B1 Runoff Hydrograph Time (hours) 3210Flow (cfs)3 2 1 0 AR - Little Rock 5-yr Duration=10 min, Inten=5.17 in/hr Runoff Area=56,515 sf Runoff Volume=1,783 cf Runoff Depth=0.38" Flow Length=223' Tc=5.0 min C=0.44 2.98 cfs AR - Little Rock 5-yr Duration=10 min, Inten=5.17 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment B2: Drainage Basin B2 Runoff = 1.89 cfs @ 0.09 hrs, Volume= 1,130 cf, Depth= 0.46" Routed to Link Post : Post-Dev Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs AR - Little Rock 5-yr Duration=10 min, Inten=5.17 in/hr Area (sf) C Description 24,610 0.60 Single Family Lot 5,108 0.22 Sandy Loam 29,718 0.53 Weighted Average 29,718 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Minimum Subcatchment B2: Drainage Basin B2 Runoff Hydrograph Time (hours) 3210Flow (cfs)2 1 0 AR - Little Rock 5-yr Duration=10 min, Inten=5.17 in/hr Runoff Area=29,718 sf Runoff Volume=1,130 cf Runoff Depth=0.46" Tc=5.0 min C=0.53 1.89 cfs AR - Little Rock 5-yr Duration=10 min, Inten=5.17 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Summary for Pond DP-1: Detention Pond Inflow Area = 56,515 sf, 6.56% Impervious, Inflow Depth = 0.38" for 5-yr event Inflow = 2.98 cfs @ 0.09 hrs, Volume= 1,783 cf Outflow = 0.25 cfs @ 0.24 hrs, Volume= 1,712 cf, Atten= 92%, Lag= 9.2 min Primary = 0.25 cfs @ 0.24 hrs, Volume= 1,712 cf Routed to Link Post : Post-Dev Routing by Stor-Ind method, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Peak Elev= 282.71' @ 0.24 hrs Storage= 1,638 cf Plug-Flow detention time= 64.9 min calculated for 1,706 cf (96% of inflow) Center-of-Mass det. time= 65.0 min ( 72.5 - 7.5 ) Volume Invert Avail.Storage Storage Description #1 281.50' 3,977 cf Custom Stage Data Listed below Elevation Cum.Store (feet) (cubic-feet) 281.50 0 282.00 320 282.50 1,204 283.00 2,214 283.50 3,354 284.00 3,977 Device Routing Invert Outlet Devices #1 Primary 281.50'12.0" Round RCP_Round 12" L= 24.0' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 281.50' / 281.00' S= 0.0208 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 0.79 sf #2 Device 1 283.67'9.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) #3 Device 1 281.50'3.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.25 cfs @ 0.24 hrs HW=282.71' (Free Discharge) 1=RCP_Round 12" (Passes 0.25 cfs of 3.20 cfs potential flow) 2=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) 3=Orifice/Grate (Orifice Controls 0.25 cfs @ 5.02 fps) AR - Little Rock 5-yr Duration=10 min, Inten=5.17 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Pond DP-1: Detention Pond Inflow Primary Hydrograph Time (hours) 3210Flow (cfs)3 2 1 0 Inflow Area=56,515 sf Peak Elev=282.71' Storage=1,638 cf 2.98 cfs 0.25 cfs Pond DP-1: Detention Pond Primary Stage-Discharge Discharge (cfs) 543210Elevation (feet)284 283 282 RCP_Round 12" + Orifice/Grate Sharp-Crested Rectangular Weir AR - Little Rock 5-yr Duration=10 min, Inten=5.17 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond DP-1: Detention Pond Elevation (feet) Storage (cubic-feet) 281.50 0 281.52 13 281.54 26 281.56 38 281.58 51 281.60 64 281.62 77 281.64 90 281.66 102 281.68 115 281.70 128 281.72 141 281.74 154 281.76 166 281.78 179 281.80 192 281.82 205 281.84 218 281.86 230 281.88 243 281.90 256 281.92 269 281.94 282 281.96 294 281.98 307 282.00 320 282.02 355 282.04 391 282.06 426 282.08 461 282.10 497 282.12 532 282.14 568 282.16 603 282.18 638 282.20 674 282.22 709 282.24 744 282.26 780 282.28 815 282.30 850 282.32 886 282.34 921 282.36 956 282.38 992 282.40 1,027 282.42 1,063 282.44 1,098 282.46 1,133 282.48 1,169 282.50 1,204 282.52 1,244 Elevation (feet) Storage (cubic-feet) 282.54 1,285 282.56 1,325 282.58 1,366 282.60 1,406 282.62 1,446 282.64 1,487 282.66 1,527 282.68 1,568 282.70 1,608 282.72 1,648 282.74 1,689 282.76 1,729 282.78 1,770 282.80 1,810 282.82 1,850 282.84 1,891 282.86 1,931 282.88 1,972 282.90 2,012 282.92 2,052 282.94 2,093 282.96 2,133 282.98 2,174 283.00 2,214 283.02 2,260 283.04 2,305 283.06 2,351 283.08 2,396 283.10 2,442 283.12 2,488 283.14 2,533 283.16 2,579 283.18 2,624 283.20 2,670 283.22 2,716 283.24 2,761 283.26 2,807 283.28 2,852 283.30 2,898 283.32 2,944 283.34 2,989 283.36 3,035 283.38 3,080 283.40 3,126 283.42 3,172 283.44 3,217 283.46 3,263 283.48 3,308 283.50 3,354 283.52 3,379 283.54 3,404 283.56 3,429 Elevation (feet) Storage (cubic-feet) 283.58 3,454 283.60 3,479 283.62 3,504 283.64 3,528 283.66 3,553 283.68 3,578 283.70 3,603 283.72 3,628 283.74 3,653 283.76 3,678 283.78 3,703 283.80 3,728 283.82 3,753 283.84 3,778 283.86 3,803 283.88 3,827 283.90 3,852 283.92 3,877 283.94 3,902 283.96 3,927 283.98 3,952 284.00 3,977 AR - Little Rock 5-yr Duration=10 min, Inten=5.17 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Summary for Link Post: Post-Dev Inflow Area = 86,233 sf, 4.30% Impervious, Inflow Depth > 0.40" for 5-yr event Inflow = 2.11 cfs @ 0.16 hrs, Volume= 2,842 cf Primary = 2.11 cfs @ 0.16 hrs, Volume= 2,842 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Link Post: Post-Dev Inflow Primary Hydrograph Time (hours) 3210Flow (cfs)2 1 0 Inflow Area=86,233 sf 2.11 cfs 2.11 cfs AR - Little Rock 10-yr Duration=10 min, Inten=5.83 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment B1: Drainage Basin B1 Runoff = 3.35 cfs @ 0.09 hrs, Volume= 2,009 cf, Depth= 0.43" Routed to Pond DP-1 : Detention Pond Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs AR - Little Rock 10-yr Duration=10 min, Inten=5.83 in/hr Area (sf) C Description 27,361 0.22 Sandy Loam 25,444 0.60 Residential Lot 3,710 0.98 Detention Pond 56,515 0.44 Weighted Average 52,805 93.44% Pervious Area 3,710 6.56% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.6 120 0.0500 3.35 Shallow Concentrated Flow, Flow around Residences Grassed Waterway Kv= 15.0 fps 0.4 103 0.0810 4.27 Shallow Concentrated Flow, Concentrated Overland Flow to Pond Grassed Waterway Kv= 15.0 fps 4.0 Direct Entry, Min TC Adustment 5.0 223 Total Subcatchment B1: Drainage Basin B1 Runoff Hydrograph Time (hours) 3210Flow (cfs)3 2 1 0 AR - Little Rock 10-yr Duration=10 min, Inten=5.83 in/hr Runoff Area=56,515 sf Runoff Volume=2,009 cf Runoff Depth=0.43" Flow Length=223' Tc=5.0 min C=0.44 3.35 cfs AR - Little Rock 10-yr Duration=10 min, Inten=5.83 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment B2: Drainage Basin B2 Runoff = 2.12 cfs @ 0.09 hrs, Volume= 1,272 cf, Depth= 0.51" Routed to Link Post : Post-Dev Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs AR - Little Rock 10-yr Duration=10 min, Inten=5.83 in/hr Area (sf) C Description 24,610 0.60 Single Family Lot 5,108 0.22 Sandy Loam 29,718 0.53 Weighted Average 29,718 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Minimum Subcatchment B2: Drainage Basin B2 Runoff Hydrograph Time (hours) 3210Flow (cfs)2 1 0 AR - Little Rock 10-yr Duration=10 min, Inten=5.83 in/hr Runoff Area=29,718 sf Runoff Volume=1,272 cf Runoff Depth=0.51" Tc=5.0 min C=0.53 2.12 cfs AR - Little Rock 10-yr Duration=10 min, Inten=5.83 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Summary for Pond DP-1: Detention Pond Inflow Area = 56,515 sf, 6.56% Impervious, Inflow Depth = 0.43" for 10-yr event Inflow = 3.35 cfs @ 0.09 hrs, Volume= 2,009 cf Outflow = 0.26 cfs @ 0.24 hrs, Volume= 1,910 cf, Atten= 92%, Lag= 9.2 min Primary = 0.26 cfs @ 0.24 hrs, Volume= 1,910 cf Routed to Link Post : Post-Dev Routing by Stor-Ind method, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Peak Elev= 282.82' @ 0.24 hrs Storage= 1,856 cf Plug-Flow detention time= 69.4 min calculated for 1,910 cf (95% of inflow) Center-of-Mass det. time= 69.1 min ( 76.6 - 7.5 ) Volume Invert Avail.Storage Storage Description #1 281.50' 3,977 cf Custom Stage Data Listed below Elevation Cum.Store (feet) (cubic-feet) 281.50 0 282.00 320 282.50 1,204 283.00 2,214 283.50 3,354 284.00 3,977 Device Routing Invert Outlet Devices #1 Primary 281.50'12.0" Round RCP_Round 12" L= 24.0' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 281.50' / 281.00' S= 0.0208 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 0.79 sf #2 Device 1 283.67'9.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) #3 Device 1 281.50'3.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.26 cfs @ 0.24 hrs HW=282.82' (Free Discharge) 1=RCP_Round 12" (Passes 0.26 cfs of 3.43 cfs potential flow) 2=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) 3=Orifice/Grate (Orifice Controls 0.26 cfs @ 5.27 fps) AR - Little Rock 10-yr Duration=10 min, Inten=5.83 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Pond DP-1: Detention Pond Inflow Primary Hydrograph Time (hours) 3210Flow (cfs)3 2 1 0 Inflow Area=56,515 sf Peak Elev=282.82' Storage=1,856 cf 3.35 cfs 0.26 cfs Pond DP-1: Detention Pond Primary Stage-Discharge Discharge (cfs) 543210Elevation (feet)284 283 282 RCP_Round 12" + Orifice/Grate Sharp-Crested Rectangular Weir AR - Little Rock 10-yr Duration=10 min, Inten=5.83 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond DP-1: Detention Pond Elevation (feet) Storage (cubic-feet) 281.50 0 281.52 13 281.54 26 281.56 38 281.58 51 281.60 64 281.62 77 281.64 90 281.66 102 281.68 115 281.70 128 281.72 141 281.74 154 281.76 166 281.78 179 281.80 192 281.82 205 281.84 218 281.86 230 281.88 243 281.90 256 281.92 269 281.94 282 281.96 294 281.98 307 282.00 320 282.02 355 282.04 391 282.06 426 282.08 461 282.10 497 282.12 532 282.14 568 282.16 603 282.18 638 282.20 674 282.22 709 282.24 744 282.26 780 282.28 815 282.30 850 282.32 886 282.34 921 282.36 956 282.38 992 282.40 1,027 282.42 1,063 282.44 1,098 282.46 1,133 282.48 1,169 282.50 1,204 282.52 1,244 Elevation (feet) Storage (cubic-feet) 282.54 1,285 282.56 1,325 282.58 1,366 282.60 1,406 282.62 1,446 282.64 1,487 282.66 1,527 282.68 1,568 282.70 1,608 282.72 1,648 282.74 1,689 282.76 1,729 282.78 1,770 282.80 1,810 282.82 1,850 282.84 1,891 282.86 1,931 282.88 1,972 282.90 2,012 282.92 2,052 282.94 2,093 282.96 2,133 282.98 2,174 283.00 2,214 283.02 2,260 283.04 2,305 283.06 2,351 283.08 2,396 283.10 2,442 283.12 2,488 283.14 2,533 283.16 2,579 283.18 2,624 283.20 2,670 283.22 2,716 283.24 2,761 283.26 2,807 283.28 2,852 283.30 2,898 283.32 2,944 283.34 2,989 283.36 3,035 283.38 3,080 283.40 3,126 283.42 3,172 283.44 3,217 283.46 3,263 283.48 3,308 283.50 3,354 283.52 3,379 283.54 3,404 283.56 3,429 Elevation (feet) Storage (cubic-feet) 283.58 3,454 283.60 3,479 283.62 3,504 283.64 3,528 283.66 3,553 283.68 3,578 283.70 3,603 283.72 3,628 283.74 3,653 283.76 3,678 283.78 3,703 283.80 3,728 283.82 3,753 283.84 3,778 283.86 3,803 283.88 3,827 283.90 3,852 283.92 3,877 283.94 3,902 283.96 3,927 283.98 3,952 284.00 3,977 AR - Little Rock 10-yr Duration=10 min, Inten=5.83 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Summary for Link Post: Post-Dev Inflow Area = 86,233 sf, 4.30% Impervious, Inflow Depth > 0.44" for 10-yr event Inflow = 2.35 cfs @ 0.16 hrs, Volume= 3,182 cf Primary = 2.35 cfs @ 0.16 hrs, Volume= 3,182 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Link Post: Post-Dev Inflow Primary Hydrograph Time (hours) 3210Flow (cfs)2 1 0 Inflow Area=86,233 sf 2.35 cfs 2.35 cfs AR - Little Rock 25-yr Duration=10 min, Inten=6.72 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment B1: Drainage Basin B1 Runoff = 3.87 cfs @ 0.09 hrs, Volume= 2,317 cf, Depth= 0.49" Routed to Pond DP-1 : Detention Pond Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs AR - Little Rock 25-yr Duration=10 min, Inten=6.72 in/hr Area (sf) C Description 27,361 0.22 Sandy Loam 25,444 0.60 Residential Lot 3,710 0.98 Detention Pond 56,515 0.44 Weighted Average 52,805 93.44% Pervious Area 3,710 6.56% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.6 120 0.0500 3.35 Shallow Concentrated Flow, Flow around Residences Grassed Waterway Kv= 15.0 fps 0.4 103 0.0810 4.27 Shallow Concentrated Flow, Concentrated Overland Flow to Pond Grassed Waterway Kv= 15.0 fps 4.0 Direct Entry, Min TC Adustment 5.0 223 Total Subcatchment B1: Drainage Basin B1 Runoff Hydrograph Time (hours) 3210Flow (cfs)4 3 2 1 0 AR - Little Rock 25-yr Duration=10 min, Inten=6.72 in/hr Runoff Area=56,515 sf Runoff Volume=2,317 cf Runoff Depth=0.49" Flow Length=223' Tc=5.0 min C=0.44 3.87 cfs AR - Little Rock 25-yr Duration=10 min, Inten=6.72 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment B2: Drainage Basin B2 Runoff = 2.45 cfs @ 0.09 hrs, Volume= 1,468 cf, Depth= 0.59" Routed to Link Post : Post-Dev Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs AR - Little Rock 25-yr Duration=10 min, Inten=6.72 in/hr Area (sf) C Description 24,610 0.60 Single Family Lot 5,108 0.22 Sandy Loam 29,718 0.53 Weighted Average 29,718 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Minimum Subcatchment B2: Drainage Basin B2 Runoff Hydrograph Time (hours) 3210Flow (cfs)2 1 0 AR - Little Rock 25-yr Duration=10 min, Inten=6.72 in/hr Runoff Area=29,718 sf Runoff Volume=1,468 cf Runoff Depth=0.59" Tc=5.0 min C=0.53 2.45 cfs AR - Little Rock 25-yr Duration=10 min, Inten=6.72 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Summary for Pond DP-1: Detention Pond Inflow Area = 56,515 sf, 6.56% Impervious, Inflow Depth = 0.49" for 25-yr event Inflow = 3.87 cfs @ 0.09 hrs, Volume= 2,317 cf Outflow = 0.27 cfs @ 0.24 hrs, Volume= 2,145 cf, Atten= 93%, Lag= 9.2 min Primary = 0.27 cfs @ 0.24 hrs, Volume= 2,145 cf Routed to Link Post : Post-Dev Routing by Stor-Ind method, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Peak Elev= 282.97' @ 0.24 hrs Storage= 2,154 cf Plug-Flow detention time= 73.4 min calculated for 2,145 cf (93% of inflow) Center-of-Mass det. time= 73.0 min ( 80.5 - 7.5 ) Volume Invert Avail.Storage Storage Description #1 281.50' 3,977 cf Custom Stage Data Listed below Elevation Cum.Store (feet) (cubic-feet) 281.50 0 282.00 320 282.50 1,204 283.00 2,214 283.50 3,354 284.00 3,977 Device Routing Invert Outlet Devices #1 Primary 281.50'12.0" Round RCP_Round 12" L= 24.0' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 281.50' / 281.00' S= 0.0208 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 0.79 sf #2 Device 1 283.67'9.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) #3 Device 1 281.50'3.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.27 cfs @ 0.24 hrs HW=282.97' (Free Discharge) 1=RCP_Round 12" (Passes 0.27 cfs of 3.72 cfs potential flow) 2=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) 3=Orifice/Grate (Orifice Controls 0.27 cfs @ 5.58 fps) AR - Little Rock 25-yr Duration=10 min, Inten=6.72 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Pond DP-1: Detention Pond Inflow Primary Hydrograph Time (hours) 3210Flow (cfs)4 3 2 1 0 Inflow Area=56,515 sf Peak Elev=282.97' Storage=2,154 cf 3.87 cfs 0.27 cfs Pond DP-1: Detention Pond Primary Stage-Discharge Discharge (cfs) 543210Elevation (feet)284 283 282 RCP_Round 12" + Orifice/Grate Sharp-Crested Rectangular Weir AR - Little Rock 25-yr Duration=10 min, Inten=6.72 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond DP-1: Detention Pond Elevation (feet) Storage (cubic-feet) 281.50 0 281.52 13 281.54 26 281.56 38 281.58 51 281.60 64 281.62 77 281.64 90 281.66 102 281.68 115 281.70 128 281.72 141 281.74 154 281.76 166 281.78 179 281.80 192 281.82 205 281.84 218 281.86 230 281.88 243 281.90 256 281.92 269 281.94 282 281.96 294 281.98 307 282.00 320 282.02 355 282.04 391 282.06 426 282.08 461 282.10 497 282.12 532 282.14 568 282.16 603 282.18 638 282.20 674 282.22 709 282.24 744 282.26 780 282.28 815 282.30 850 282.32 886 282.34 921 282.36 956 282.38 992 282.40 1,027 282.42 1,063 282.44 1,098 282.46 1,133 282.48 1,169 282.50 1,204 282.52 1,244 Elevation (feet) Storage (cubic-feet) 282.54 1,285 282.56 1,325 282.58 1,366 282.60 1,406 282.62 1,446 282.64 1,487 282.66 1,527 282.68 1,568 282.70 1,608 282.72 1,648 282.74 1,689 282.76 1,729 282.78 1,770 282.80 1,810 282.82 1,850 282.84 1,891 282.86 1,931 282.88 1,972 282.90 2,012 282.92 2,052 282.94 2,093 282.96 2,133 282.98 2,174 283.00 2,214 283.02 2,260 283.04 2,305 283.06 2,351 283.08 2,396 283.10 2,442 283.12 2,488 283.14 2,533 283.16 2,579 283.18 2,624 283.20 2,670 283.22 2,716 283.24 2,761 283.26 2,807 283.28 2,852 283.30 2,898 283.32 2,944 283.34 2,989 283.36 3,035 283.38 3,080 283.40 3,126 283.42 3,172 283.44 3,217 283.46 3,263 283.48 3,308 283.50 3,354 283.52 3,379 283.54 3,404 283.56 3,429 Elevation (feet) Storage (cubic-feet) 283.58 3,454 283.60 3,479 283.62 3,504 283.64 3,528 283.66 3,553 283.68 3,578 283.70 3,603 283.72 3,628 283.74 3,653 283.76 3,678 283.78 3,703 283.80 3,728 283.82 3,753 283.84 3,778 283.86 3,803 283.88 3,827 283.90 3,852 283.92 3,877 283.94 3,902 283.96 3,927 283.98 3,952 284.00 3,977 AR - Little Rock 25-yr Duration=10 min, Inten=6.72 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Summary for Link Post: Post-Dev Inflow Area = 86,233 sf, 4.30% Impervious, Inflow Depth > 0.50" for 25-yr event Inflow = 2.69 cfs @ 0.16 hrs, Volume= 3,612 cf Primary = 2.69 cfs @ 0.16 hrs, Volume= 3,612 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Link Post: Post-Dev Inflow Primary Hydrograph Time (hours) 3210Flow (cfs)3 2 1 0 Inflow Area=86,233 sf 2.69 cfs 2.69 cfs AR - Little Rock 100-yr Duration=10 min, Inten=7.98 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment B1: Drainage Basin B1 Runoff = 4.59 cfs @ 0.09 hrs, Volume= 2,752 cf, Depth= 0.58" Routed to Pond DP-1 : Detention Pond Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs AR - Little Rock 100-yr Duration=10 min, Inten=7.98 in/hr Area (sf) C Description 27,361 0.22 Sandy Loam 25,444 0.60 Residential Lot 3,710 0.98 Detention Pond 56,515 0.44 Weighted Average 52,805 93.44% Pervious Area 3,710 6.56% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.6 120 0.0500 3.35 Shallow Concentrated Flow, Flow around Residences Grassed Waterway Kv= 15.0 fps 0.4 103 0.0810 4.27 Shallow Concentrated Flow, Concentrated Overland Flow to Pond Grassed Waterway Kv= 15.0 fps 4.0 Direct Entry, Min TC Adustment 5.0 223 Total Subcatchment B1: Drainage Basin B1 Runoff Hydrograph Time (hours) 3210Flow (cfs)5 4 3 2 1 0 AR - Little Rock 100-yr Duration=10 min, Inten=7.98 in/hr Runoff Area=56,515 sf Runoff Volume=2,752 cf Runoff Depth=0.58" Flow Length=223' Tc=5.0 min C=0.44 4.59 cfs AR - Little Rock 100-yr Duration=10 min, Inten=7.98 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment B2: Drainage Basin B2 Runoff = 2.91 cfs @ 0.09 hrs, Volume= 1,743 cf, Depth= 0.70" Routed to Link Post : Post-Dev Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs AR - Little Rock 100-yr Duration=10 min, Inten=7.98 in/hr Area (sf) C Description 24,610 0.60 Single Family Lot 5,108 0.22 Sandy Loam 29,718 0.53 Weighted Average 29,718 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Minimum Subcatchment B2: Drainage Basin B2 Runoff Hydrograph Time (hours) 3210Flow (cfs)3 2 1 0 AR - Little Rock 100-yr Duration=10 min, Inten=7.98 in/hr Runoff Area=29,718 sf Runoff Volume=1,743 cf Runoff Depth=0.70" Tc=5.0 min C=0.53 2.91 cfs AR - Little Rock 100-yr Duration=10 min, Inten=7.98 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Summary for Pond DP-1: Detention Pond Inflow Area = 56,515 sf, 6.56% Impervious, Inflow Depth = 0.58" for 100-yr event Inflow = 4.59 cfs @ 0.09 hrs, Volume= 2,752 cf Outflow = 0.29 cfs @ 0.24 hrs, Volume= 2,398 cf, Atten= 94%, Lag= 9.3 min Primary = 0.29 cfs @ 0.24 hrs, Volume= 2,398 cf Routed to Link Post : Post-Dev Routing by Stor-Ind method, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Peak Elev= 283.16' @ 0.24 hrs Storage= 2,576 cf Plug-Flow detention time= 75.8 min calculated for 2,390 cf (87% of inflow) Center-of-Mass det. time= 75.3 min ( 82.8 - 7.5 ) Volume Invert Avail.Storage Storage Description #1 281.50' 3,977 cf Custom Stage Data Listed below Elevation Cum.Store (feet) (cubic-feet) 281.50 0 282.00 320 282.50 1,204 283.00 2,214 283.50 3,354 284.00 3,977 Device Routing Invert Outlet Devices #1 Primary 281.50'12.0" Round RCP_Round 12" L= 24.0' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 281.50' / 281.00' S= 0.0208 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 0.79 sf #2 Device 1 283.67'9.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) #3 Device 1 281.50'3.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.29 cfs @ 0.24 hrs HW=283.16' (Free Discharge) 1=RCP_Round 12" (Passes 0.29 cfs of 4.07 cfs potential flow) 2=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) 3=Orifice/Grate (Orifice Controls 0.29 cfs @ 5.96 fps) AR - Little Rock 100-yr Duration=10 min, Inten=7.98 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Pond DP-1: Detention Pond Inflow Primary Hydrograph Time (hours) 3210Flow (cfs)5 4 3 2 1 0 Inflow Area=56,515 sf Peak Elev=283.16' Storage=2,576 cf 4.59 cfs 0.29 cfs Pond DP-1: Detention Pond Primary Stage-Discharge Discharge (cfs) 543210Elevation (feet)284 283 282 RCP_Round 12" + Orifice/Grate Sharp-Crested Rectangular Weir AR - Little Rock 100-yr Duration=10 min, Inten=7.98 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond DP-1: Detention Pond Elevation (feet) Storage (cubic-feet) 281.50 0 281.52 13 281.54 26 281.56 38 281.58 51 281.60 64 281.62 77 281.64 90 281.66 102 281.68 115 281.70 128 281.72 141 281.74 154 281.76 166 281.78 179 281.80 192 281.82 205 281.84 218 281.86 230 281.88 243 281.90 256 281.92 269 281.94 282 281.96 294 281.98 307 282.00 320 282.02 355 282.04 391 282.06 426 282.08 461 282.10 497 282.12 532 282.14 568 282.16 603 282.18 638 282.20 674 282.22 709 282.24 744 282.26 780 282.28 815 282.30 850 282.32 886 282.34 921 282.36 956 282.38 992 282.40 1,027 282.42 1,063 282.44 1,098 282.46 1,133 282.48 1,169 282.50 1,204 282.52 1,244 Elevation (feet) Storage (cubic-feet) 282.54 1,285 282.56 1,325 282.58 1,366 282.60 1,406 282.62 1,446 282.64 1,487 282.66 1,527 282.68 1,568 282.70 1,608 282.72 1,648 282.74 1,689 282.76 1,729 282.78 1,770 282.80 1,810 282.82 1,850 282.84 1,891 282.86 1,931 282.88 1,972 282.90 2,012 282.92 2,052 282.94 2,093 282.96 2,133 282.98 2,174 283.00 2,214 283.02 2,260 283.04 2,305 283.06 2,351 283.08 2,396 283.10 2,442 283.12 2,488 283.14 2,533 283.16 2,579 283.18 2,624 283.20 2,670 283.22 2,716 283.24 2,761 283.26 2,807 283.28 2,852 283.30 2,898 283.32 2,944 283.34 2,989 283.36 3,035 283.38 3,080 283.40 3,126 283.42 3,172 283.44 3,217 283.46 3,263 283.48 3,308 283.50 3,354 283.52 3,379 283.54 3,404 283.56 3,429 Elevation (feet) Storage (cubic-feet) 283.58 3,454 283.60 3,479 283.62 3,504 283.64 3,528 283.66 3,553 283.68 3,578 283.70 3,603 283.72 3,628 283.74 3,653 283.76 3,678 283.78 3,703 283.80 3,728 283.82 3,753 283.84 3,778 283.86 3,803 283.88 3,827 283.90 3,852 283.92 3,877 283.94 3,902 283.96 3,927 283.98 3,952 284.00 3,977 AR - Little Rock 100-yr Duration=10 min, Inten=7.98 in/hrChicot Rd Subdivision Printed 4/17/2024Prepared by Phillip Lewis Engineering HydroCAD® 10.20-2f s/n 12520 © 2022 HydroCAD Software Solutions LLC Summary for Link Post: Post-Dev Inflow Area = 86,233 sf, 4.30% Impervious, Inflow Depth > 0.58" for 100-yr event Inflow = 3.17 cfs @ 0.16 hrs, Volume= 4,141 cf Primary = 3.17 cfs @ 0.16 hrs, Volume= 4,141 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Link Post: Post-Dev Inflow Primary Hydrograph Time (hours) 3210Flow (cfs)3 2 1 0 Inflow Area=86,233 sf 3.17 cfs 3.17 cfs PHILLIP LEWIS ENGINEERING, INC. Structural/Civil Design 23620 Interstate 30 N Bryant, Arkansas 72022 Outlet Structure PHILLIP LEWIS ENGINEERING, INC. Structural/Civil Design 23620 Interstate 30 N Bryant, Arkansas 72022 FEMA Flood Insurance Rate Map PHILLIP LEWIS ENGINEERING, INC. Structural/Civil Design 23620 Interstate 30 N Bryant, Arkansas 72022 Soil Map United States Department of Agriculture A product of the National Cooperative Soil Survey, a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local participants Custom Soil Resource Report for Pulaski County, ArkansasNatural Resources Conservation Service April 2, 2024 Preface Soil surveys contain information that affects land use planning in survey areas. They highlight soil limitations that affect various land uses and provide information about the properties of the soils in the survey areas. Soil surveys are designed for many different users, including farmers, ranchers, foresters, agronomists, urban planners, community officials, engineers, developers, builders, and home buyers. Also, conservationists, teachers, students, and specialists in recreation, waste disposal, and pollution control can use the surveys to help them understand, protect, or enhance the environment. Various land use regulations of Federal, State, and local governments may impose special restrictions on land use or land treatment. Soil surveys identify soil properties that are used in making various land use or land treatment decisions. The information is intended to help the land users identify and reduce the effects of soil limitations on various land uses. The landowner or user is responsible for identifying and complying with existing laws and regulations. Although soil survey information can be used for general farm, local, and wider area planning, onsite investigation is needed to supplement this information in some cases. Examples include soil quality assessments (http://www.nrcs.usda.gov/wps/ portal/nrcs/main/soils/health/) and certain conservation and engineering applications. For more detailed information, contact your local USDA Service Center (https://offices.sc.egov.usda.gov/locator/app?agency=nrcs) or your NRCS State Soil Scientist (http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/contactus/? cid=nrcs142p2_053951). Great differences in soil properties can occur within short distances. Some soils are seasonally wet or subject to flooding. Some are too unstable to be used as a foundation for buildings or roads. Clayey or wet soils are poorly suited to use as septic tank absorption fields. A high water table makes a soil poorly suited to basements or underground installations. The National Cooperative Soil Survey is a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local agencies. The Natural Resources Conservation Service (NRCS) has leadership for the Federal part of the National Cooperative Soil Survey. Information about soils is updated periodically. Updated information is available through the NRCS Web Soil Survey, the site for official soil survey information. The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require 2 alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and employer. 3 Contents Preface....................................................................................................................2 Soil Map..................................................................................................................5 Soil Map................................................................................................................6 Legend..................................................................................................................7 Map Unit Legend..................................................................................................8 Map Unit Descriptions..........................................................................................8 Pulaski County, Arkansas...............................................................................10 Ao—Amy silt loam, 0 to 1 percent slopes, frequently flooded.....................10 StD—Smithdale fine sandy loam, 8 to 12 percent slopes...........................11 SuC—Smithdale-Urban land complex, 3 to 8 percent slopes.....................12 4 Soil Map The soil map section includes the soil map for the defined area of interest, a list of soil map units on the map and extent of each map unit, and cartographic symbols displayed on the map. Also presented are various metadata about data used to produce the map, and a description of each soil map unit. 5 6 Custom Soil Resource Report Soil Map 383298038329903833000383301038330203833030383304038330503833060383307038330803833090383310038331103833120383298038329903833000383301038330203833030383304038330503833060383307038330803833090383310038331103833120558200 558210 558220 558230 558240 558250 558260 558270 558280 558290 558300 558200 558210 558220 558230 558240 558250 558260 558270 558280 558290 558300 558310 34° 38' 18'' N 92° 21' 54'' W34° 38' 18'' N92° 21' 49'' W34° 38' 13'' N 92° 21' 54'' W34° 38' 13'' N 92° 21' 49'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 15N WGS84 0 35 70 140 210 Feet 0 10 20 40 60 Meters Map Scale: 1:756 if printed on A portrait (8.5" x 11") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Blowout Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:20,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Pulaski County, Arkansas Survey Area Data: Version 20, Sep 12, 2023 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: May 1, 2022—May 29, 2022 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Custom Soil Resource Report 7 Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI Ao Amy silt loam, 0 to 1 percent slopes, frequently flooded 1.4 49.1% StD Smithdale fine sandy loam, 8 to 12 percent slopes 0.5 17.5% SuC Smithdale-Urban land complex, 3 to 8 percent slopes 1.0 33.4% Totals for Area of Interest 2.9 100.0% Map Unit Descriptions The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or Custom Soil Resource Report 8 landform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, onsite investigation is needed to define and locate the soils and miscellaneous areas. An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Soils that have profiles that are almost alike make up a soil series. Except for differences in texture of the surface layer, all the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha-Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha-Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example. Custom Soil Resource Report 9 Pulaski County, Arkansas Ao—Amy silt loam, 0 to 1 percent slopes, frequently flooded Map Unit Setting National map unit symbol: 2s1z7 Elevation: 50 to 250 feet Mean annual precipitation: 38 to 61 inches Mean annual air temperature: 49 to 73 degrees F Frost-free period: 220 to 260 days Farmland classification: Farmland of statewide importance Map Unit Composition Amy and similar soils:90 percent Minor components:10 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Amy Setting Landform:Stream terraces Landform position (two-dimensional):Footslope Landform position (three-dimensional):Talf Down-slope shape:Linear Across-slope shape:Linear Parent material:Pleistocene era silty alluvium derived from sedimentary rock Typical profile A - 0 to 3 inches: silt loam Eg - 3 to 24 inches: silt loam Btg1 - 24 to 40 inches: silty clay loam Btg2 - 40 to 56 inches: silt loam Cg - 56 to 80 inches: silty clay loam Properties and qualities Slope:0 to 1 percent Depth to restrictive feature:More than 80 inches Drainage class:Poorly drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat):Moderately low to moderately high (0.06 to 0.20 in/hr) Depth to water table:About 0 to 12 inches Frequency of flooding:Frequent Frequency of ponding:None Maximum salinity:Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water supply, 0 to 60 inches: High (about 10.2 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 5w Hydrologic Soil Group: C/D Ecological site: F133BY017TX - Loamy Bottomland Hydric soil rating: Yes Custom Soil Resource Report 10 Minor Components Ouachita Percent of map unit:5 percent Landform:Flood plains Landform position (three-dimensional):Rise Down-slope shape:Linear Across-slope shape:Linear Ecological site:F133BY017TX - Loamy Bottomland Hydric soil rating: No Aquults Percent of map unit:5 percent Landform:Flood plains Landform position (three-dimensional):Talf Down-slope shape:Concave Across-slope shape:Linear Hydric soil rating: Yes StD—Smithdale fine sandy loam, 8 to 12 percent slopes Map Unit Setting National map unit symbol: 2tztf Elevation: 50 to 250 feet Mean annual precipitation: 38 to 61 inches Mean annual air temperature: 52 to 73 degrees F Frost-free period: 220 to 260 days Farmland classification: Not prime farmland Map Unit Composition Smithdale and similar soils:100 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Smithdale Setting Landform:Interfluves Landform position (three-dimensional):Side slope Down-slope shape:Convex Across-slope shape:Linear Parent material:Loamy marine deposits Typical profile Ap - 0 to 6 inches: fine sandy loam Bt1 - 6 to 45 inches: sandy clay loam Bt2 - 45 to 85 inches: sandy loam Properties and qualities Slope:8 to 12 percent Depth to restrictive feature:More than 80 inches Custom Soil Resource Report 11 Drainage class:Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat):Moderately high to high (0.60 to 2.00 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Maximum salinity:Nonsaline to slightly saline (0.0 to 4.0 mmhos/cm) Available water supply, 0 to 60 inches: High (about 9.4 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4e Hydrologic Soil Group: B Ecological site: F133BY005TX - Loamy Upland Hydric soil rating: No SuC—Smithdale-Urban land complex, 3 to 8 percent slopes Map Unit Setting National map unit symbol: m05s Elevation: 70 to 610 feet Mean annual precipitation: 43 to 58 inches Mean annual air temperature: 50 to 72 degrees F Frost-free period: 200 to 260 days Farmland classification: Not prime farmland Map Unit Composition Smithdale and similar soils:51 percent Urban land:49 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Smithdale Setting Landform:Interfluves Down-slope shape:Linear Across-slope shape:Convex Parent material:Loamy marine deposits Typical profile Ap - 0 to 5 inches: fine sandy loam Bt1 - 5 to 16 inches: clay loam Bt2 - 16 to 72 inches: sandy loam Properties and qualities Slope:3 to 8 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat):Moderately high to high (0.57 to 1.98 in/hr) Custom Soil Resource Report 12 Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Available water supply, 0 to 60 inches: High (about 9.1 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 3e Hydrologic Soil Group: B Ecological site: F133BY005TX - Loamy Upland Hydric soil rating: No Description of Urban Land Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 8 Hydrologic Soil Group: D Hydric soil rating: No Custom Soil Resource Report 13