HomeMy WebLinkAbout211-1; Carlsbad Storm Drains Calculations; Carlsbad Storm Drains Calculations; 1983-10-06«
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HYDRAULIC CALCULATIONS
A ^ r, "—fy (^
SHEET NO..
JOB HO.
DATE
_OF ._
BY
E.G.L. H.G.L. !! Q
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RUNOFF COEFFICIENTS (RATIONAL METHODJ
LAND USE
Undeveloped
Residential:
Rural
Coefficient, C
Soil Group (1)
A B ' C D •
.50 .35 .40 .45
.50 .55 .40 .45
Single Family
Multi-Units
Mobile Homes (2)
Commercial (2)
80% Impervious
Industrial (2)
90% Impervious
40
45
45
70
.45
.50.
.50
. 75
.50
.60
.55
.80
.55
. 70
'..65
. .85
SO .85 .90 .95
NOTES:
(.1) Obtain soil group from maps on file with the Department of Sanitation >,
and Flood Control.
(2) Where actual conditions deviate significantly from the tabulated
Imperviousness values of 80% or 90%, the values given for coefficient
C, may be revised by multiplying 80% or 90% by the ratio "of actual
.imperviousness to the tabulated imperviousness. However, in no case
shall the final coefficient be less than 0.50. For example: Consider
commercial property on D soil group.
Actual imperviousness = 50%
Tabulated imperviousness = 80%
_50
80"Revised C .= A?. X 0.85 = 0.55
APPENDIX IX
o o
RUNOFF COEFFICIENTS (RATIONAL METHOD)
Undeveloped
Resident ial:
Rural
Coefficient, C
Soil Group (1)
A B_ ' C D
.50 .35 .40 .45
.40 .45
Single Family
Multi-Units
Mobile Homes (2)
Commercial (2)
80% Impervious
Industrial (2)
90% Impervious
40
45
45
70
.45
.50.
.50
. 75
.50
.60
.55
.80
80 ,85 90
.55
•JO
' ' . )'
.85.:,;: '::'
.95'
(1) Obtain soil group from maps on file with the Department of Sanitation'^
and Flood Control. . • ' "
(2) Where actual conditions deviate significantly from the tabulated
imperviousness values of 80% or 90%, the values given for coefficient
C, may be revised by multiplying 80% or 90% by the ratio "of actual
imperviousness to the tabulated imperviousness. However, in no case
shall the final coefficient be less than 0.50. For example: Consider
commercial property on D soil group.
Actual imperviousness = 50%
Tabulated imperviousness - 80%
Revised C = 1P_ X 0.85 = 0. 5580
APPENDIX IX . •
o.
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me =/? Af//7t//£S
SAN .DIEGO COUNTY
DEPARTMENT OF SPECIAL DISTRICT SERVICES
DESIGN MANUAL ,
APPROVED
URBAN AREAS OVERLAND TIME .
OF FLOW CURVES
DATE APPENDIX X
ELEV. FACTOR
0—!5OO L OO
SOO—3OOO 1.25
30OO— 4OOO 1.42
40O'O—5OOO 1.60
500O-6OOO !.70
DESERT 1*25
To obtain correct intensity,
multiply intensily on chart
by. facfor for design
a I e v a "t i o n.
no
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DISCHARGE (CfTS)
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;: Ctvt! Engineering Planning ...Land Surveying .:
11511 MOREHA. BLVD. SAN DIEGO, XA.*
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TiB^fSA PEL.
.- .. Civil Engineering Planning land Surveying :
tl511 MORENA BLVD. SAN DIEGO,'CA. 92HO .,
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