HomeMy WebLinkAboutTract 7262 -Panama Lane - Offsite DrainageCITY OF BAKERSFIELD RATIONAL METHOD
(In accordance with City of Bakersfield Standards)
TABLE OF RUNOFF COEFFICIENTS
R-1, 6000 SF 0.42
JOB TITLE:PANAMA LANE R-1, 6750 SF 0.4
DATE:Mar-21 R-1, 7500 SF 0.38
R-1, 10000 SF 0.34
Rational Values:R-1, 15000 SF 0.27
Event: 10 YEAR Values: 5, 10, 50 R-3, R-4, M-H 0.8
M.A.P. 6 in./yr. Values: 6, 10, 15, 20, 25, 30 Commercial 0.9
Industrial 0.8
Curve Values Parks 0.15
a: 2.38 I=a+bTc (Tc<20min.) Grasslands, Type A Soil 0.15
b: -0.058 Grasslands, Type B Soil 0.25
P60: 0.550 I=K1*(6.02*Tc)^(0.17*LN(p60/K1) Grasslands, Type C Soil 0.35
K1: 40.00 (Tc>=20min.) Grasslands, Type D Soil 0.45
Pavement, drives & roofs 0.95
Backyards 0.05
Lawn-landscape 2% slope 0.10 0.17
C: 0.01 Lawn-landscape 2-7% slope 0.15 0.22
0.92 Lawn-landscape 7% slope 0.20 0.35
SUBAREA C I A rslt Tc L dH Sg Q Street V Trial Tc Roof to Tm D Curb
NAME Runoff Intensity Total Time Length Elev. Gutter Flow Type Vel. MIN. Gutter Travel Pipe Cap
Coef. IN/HR Area Conc. Feet Diff. Slope CFS FPS Time Time Dia. In
AC. MIN. Feet Ft/Ft MIN. MIN. In.
OFF-SITE AREA (S)0.85 1.30 2.05 18.66 1126.0 2.80 0.25% 2.26 60 1.74 18.66 0.00 10.81 4.18
NEW PIPE 95.0 1.28 1.24 18
19.90
OFF-SITE AREA (N)0.85 1.22 3.36 19.90 1426.0 2.84 0.20% 3.50 60 1.84 19.90 0.00 12.94 4.68
PIPE 18 0.85 1.22 5.41 222.4 5.63 60 3.18 19.90 1.16 18
21.06
Org Total Q per Approved Study = 3.40 Delta Q =2.23 cfs to be added to existing Qs in the Approved Drainage Study.
Tc CALCULATIONS
PANAMA LANE
CITY-REV.xls
McIntosh Associates
2001 Wheelan Ct
Bakersfield, CA 93309 10 yr Calc
OFF-SITE AREA (S)2.05 ACRES
NTS
PANAMA LANE (SOUTH OF CL)
TRIBUTARY AREA EXHIBITDe 18" RCP
PIPE 27Q= 22.63 CFSPIPE 24Q= 21.03 CFSPIPE 23Q= 15.33 CFSPIPE 22Q= 15.33 CFSPIPE 19Q= 10.53 CFSPIPE 18Q= 5.63 CFSSTUB/NEW PIPEQ= 2.26 CFS