HomeMy WebLinkAboutCT 90-23; Fairways; Preliminary Hydrology Study; 1989-08-16O‘DAY CONSULTANTS J.N. 87-3006 PROJECT: FAIRWAYS PAGE 1 OF 23 AUG 89
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PRELIMINARY
HYDROMGY STUDY
FOR
FAIRWAYS C!&;JT”o ew*
JOB # 87-3006
ALICANTE HILLS
PAGE 2 OF 23
TABLE OF CONTENTS
O'DAY CONSULTANTS
2
1
3
4
5
7
6
8
10 9
11
12
13
SECTION
EXISTING DRAINAGE AREAS AND QUANTITIES
PROPOSED DRAINAGE AREAS AND QUANTITIES DRAINAGE AREA PROPERTIES, EXISTING DRAINAGE AREA PROPERTIES, PROPOSED
USGS QUAD SHEET 10-YEAR INTENSITY CURVE
50-YEAR INTENSITY CURVE
RUNOFF COEFFICIENTS
100-YEAR INTENSITY CURVE
T, FOR NATURAL WATERSHEDS (APP. X-A)
URBAN OVERLAND TIME OF FLOW CURVES (APP. X-C) ROADWAY VELOCITY CHART (APP. X-D) SOILS CLASSIFICATION MAP
ATTACHED: A - "DRAINAGE STUDY" MAP
PAGE
3
4,5 6
7'8 9
10-12
13-15
16-18
20
19
21
22
23
B - HYDROLOGY STUDY OF CT 81-29 DATED 12-9-81
C - 400 SCALE ORTHOTOPOGRAPHIC MAP
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~~ . -~ . ... ". ........... ~ ..... .....................
~~ . ................. "" - . __ -
- - ~ .... .............
.. ~ "" .~ "" "" ... ." ...
.. - .... .. ...... ....
"" ...... ... ."~-~.~""."_I ...... - -
..... -. .... ...... . -. ...... ..... ....................
. .. - . .
-. - - .. .
. . ~.
* *I I e:
6-Hour Precipitation (inches)
0v)OvIOua 0 ua 0 Lo 0 . . . . . . .
I- c < - t
2- c
L
-
do
n nn -
6-Hour Precipitation (inches)
0 m
..
d
.r L
n- e N m a -In-
C c?l c Q - 0
9. n- - e" 40 - NOU
6-Hour Precipitation (inches)
OVIOrnOln 0 In 0 In . . . . . - . 0
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_-
LL'D USE
RUXOFF COEFFICIENTS (RATIONAL METHOD)
Undeveluped
Residential :
Rural
Single Family
Multi-Units
Mobile Homes (2)
Commercial (2)
80% Inpervious
Industrial (2)
90% Impervious
Coefficient, C
Soil Group (I)
A B C .x .35 .40
- - -
. 50 .33 .40 "
.40 .45 .so
.45 . so .60
.45 .so .55
. 70 . is .80
.so .85 .90
- D
.IS
.1;
.35 "
.70
.65
.35
.9j
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 coefficiecr
C, may be revised by multiplying 80% or 90% by the ratio of actxal
imperviousness to tle tabulated imperviousness. However, in no case
commertial Troperty on D soil group.
shall the final coefficient be less than 0.50. For example: Conslder
Actual imperviousness = 50%
Tabulated imperviousness = SO;
Revised C = so X 0.85 = 0.53 x6
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.I
SAN DIEGO COUNTY NOMOGRAPH FOR DETERMINATON
DEPARTMENT OF SPECIAL DISTRICT SERVICES OF TIME OF CONCENTRATION (Tc) FOR NATURAL WATERSHEDS DESIGN MANUAL
r"n"\,Cn ,.;. // /u&L" "2% Aoocklnt" "-A
I SAN D!EGO COUNTY I U?BAN AREAS OVERLAND TIME 1 DEPARTMENT OF SPEClAL ClSTRlCT SERVICES 1 OF FLOW PUR'JES
SAN DlEGO CCUlVt'Y
DEPARTMENT OF SPECIAL DlSfRlCT SERVICES
' CUTTER AN0 RCADWAY
DISCHARGE-VELOCITY CUCR'
DESIGN MANUAL ,/ & '...% &=pRrjVED E. d I, , ,*n;+J./..- 1 9.477 12/30/!6? ! A?oENDIX X-9