HomeMy WebLinkAboutvillas detention volume calculations prelimROSEMARY VILLAS AT CB3:K65HENAL
STORMWATER DETENTION
NORTH DRAINAGE AREAS
DRAINAGE AREA
8.64 AC
TC
10 MIN
25 YEAR INTENSITY
7.1
C(UNDEVEL)
0.55
FLOW(UNDEVEL)
33.7392 CFS
C(DEVELOPED)
0.75
FLOW(UNDEVEL)
46.008 CFS
DETENTION VOLUME
7361.28 CUBIC FEET
USE DBL 72" PIPE X 130 LF =
7350.2 CUBIC FEET (CLOSE ENOUGH FOR PRELIMIANRY CALC)
DRAINAGE AREA TO RAHLING ROAD BOX CULVERT (EXCLUDING FUTURE COMMERCIAL)
DRAINAGE AREA
26.36 AC
TC
30 MIN
25 YEAR INTENSITY
4.5
C(UNDEVEL)
0.55
FLOW(UNDEVEL)
65.241 CFS
C(DEVELOPED)
0.75
FLOW(UNDEVEL)
88.965 CFS
DETENTION VOLUME
42703.2 CUBIC FEET
USE QUAD 72" PIPE X 380 LF =
42970.4 CUBIC FEET (CLOSE ENOUGH FOR PRELIMIANRY CALC)
CHECK 20 MIN TC
DRAINAGEAREA 26.36 AC
TC 20 MIN
25 YEAR INTENSITY 5.6
C(UNDEVEL) 0.55
FLOW(UNDEVEL) 81.1888 CFS
C(DEVELOPED) 0.75
FLOW(UNDEVEL) 110.712 CFS
DETENTION VOLUME 35427.84 CUBIC FEET
USE QUAD 72" PIPE X 315 LF = 35620.2 CUBIC FEET (CLOSE ENOUGH FOR PRELIMIANRY CALC)
SUMMARY
FOR NORTH BASIN, IF REQUIRED DOUBLE 72" PIPE X 130 LINEAR FEET PROVIDES ADEQUATE DETENTION VOLUME
FOR SOUTH AND CENTRAL BASIN, WHICH COMBINE AT RAHLING ROAD BOX CULVERT
QUAD 72" PIPE X 380 LINEAR FEET PROVIDES ADEQUATE DETENTION VOLUME
THESE CALCULATIONS ARE PRELIMINARY AND INTENDED TO PROVE ONLY PROOF OF CONCEPT.
FINAL CALCUATIONS WILL BE PROVIDED WITH GRADING AND DRAINAGE PLAN, PRIOR TO ANY CONSTRUCTION
OR WORK ON THE SITE.