HomeMy WebLinkAboutCT 00-02; CALAVERA HILLS PHASE II; PRELIMINARY HYDROLOGY STUDY; 2000-01-21PRELIMINARY
HYDROLOGY STUDY
FOR
CALAYERA HILLS PHASE LI
Prepared By:
O'DAY CONSULTANTS
5900 Pasteur Court, Suite 100
Carlsbad, California 92008
(760) 931-7700
January 21, 2000
George ODV 7 RCE 32014 Prepared By:
Registration Expires 12/31/00 Checked By: GO
This preliminary drainage report has been prepared for the intial review of the tentative
maps by the City of Carlsbad.
The following references were used
Hydrology Manual. County of San Diego,
Dated January 1985
City of Carlsbad standards for design &
Construction of public works improvements
In the City of Carlsbad, dated April 20, 1993
HYDROLOGY CALCULATIONS
The hydrological analysis utilized to calculate the storm runoff for the 100 year
storm event was the Rational Method (Q = C * J * A).
Q = Runoff (cfs),
C = Runoff coefficient,
IA = Rainfall intensity (inches/hour)
A = Area (acres)
Tc = Time of Concentration (Initial, overland, street gutter or pipe).
Determination of Runoff Coefficient
The runoff coefficient (C) is based on the soil group of the drainage basin.
Runoff coefficients are also dependent on the proposed land use of each basin.
Coefficients for this project were based from the County of San Diego Hydrology
Manual.
Determination of Intensity
Rainfall intensity (I) is a function of the six-hour precipitation measure and the time
of concentration for the drainage basin, as defined by the County of San Diego
Hydrology Manual
Determination of Areas
The area (A) of each drainage basin was determined from the drainage area map.
The drainage sub-basins have been based on the ultimate anticipated land use.
Hydrology Calculations
A summary of hydrology calculations for the developed conditions is listed in
Exhibit.
Exhibit "A" San Diego County Soil Classification Map
Exhibit "B" San Diego County Runoff Coefficients
Exhibit "C" Thomas Brother's Map - Location of Site
Exhibit "D" 100-year, 24 Hour Precipitation
Exhibit "E" 100-year, 6 Hour Precipitation
Exhibit "F" Intensity - Duration Design Chart
Exhibit "G" Urban Areas Overland Time of Flow Curves
Exhibit "H" Gutter and Roadway Discharge - Velocity Chart
Exhibit "I" Nomograph for Time of Concentration for Natural Watershed
Exhibit "J" 400-Scale City of Carlsbad Topographic Map with Project Plotted
Exhibit "K" 100-Scale Composite of the Tentative Maps - Villages U, W, X, Y, K, L-2, and R
Exhibit "L" 40-Scale Composite of the Tentative Maps - Villages H
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TABLE
RUNOFF COEFFICIENTS (RATIONAL METHOD)
DEVELOPED AREAS (URBAN)
Coefficient, C
Soil Group (1)
Land Use
A B C D
Residential: -
Single Family .40 .45 .50 .55
Multi-Units .45 .50 .60 .70
Mobile homes .45 .50 .55 .65
Rural (lots greater than 1/2 acre) .30 .35 .40 .45
conrierciai(2) .70 .75 .80 .85
80% Impervious
Industrial(2) .80 .85 .90 95
90% Impervious
NOTES:
Soil Group mans are available at the offices of the Department of Public Works.
(2)Where actual conditions deviate significantly from the tabulated impervious-
ness values of 80% or 90%, the values given for coefficient C, may be revised
by multiplying 80110 or 901% 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 0 soil.-group.
Actual imperviousness = 50%
Tabulated imperviousness = 809%
Revised C =. LO x 0.85 = 0.53 80
IV-A-9
APPENDIX TX-B
Rev. 5/81
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DESIGNED BY: HA.
DRAWN BY: J.S.
DATE: NOV. 1999
SCALE: AS SHOWN
PROJECT MGR: G.O'D.
CONSULT N T S
JOB NO..' 98-1020
5900 Pasteur Court
Suite 100
Civil £nginering
Planning ENGINEER OF WORK
Carlsbad, California 92008 Processing
780-931-7700
Fox: 760-931-8680
Surveying
DATE:
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CA / A VERA Hlfl S PHASE 1/
VILLAGES K, L -2 & P
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DATE- SEP. 1999
a,o
CONSULT NIS
5900 Pasteur Court Civil Engineering ENGINEER OF WORK' Suite 100 Planning
Carlsbad, California 92008 Processing
760-931-7700 Surveying
Fox: 760-931-8680
odayOodoyconsul ton ts.com GEORGE O'OAY RCE: 32014
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