1990-465 G Street Address
Category Serial #
Name Description
Plan ck. # Year
recdescv
LOGAN ENGINEERING
466 First Street, Suite A
Encinitas, CA 92024
619 - 942 -8474
NOVEMBER 2, 1990 1 OF Z
HYDROLOGY STUDY
FOR
LOT 10 - BROOKSIDE G.P. NO. 0465 -G
DESCRIPTION•
PROPOSED SINGLE FAMILY RESIDENCE
LOT 10 OF BROOKSIDE DEVELOPMENT
MAP NO. 12338
APN 265 - 251 -09 t
OWNER/ PERMITTEE : f .`•
COMMERCIAL FACILITIES
1458 VANESSA CIRCLE
ENCINITAS, CA 92024
Eh
619 - 452 -1231 12 '
ENGINEER •
LOGAN ENGINEERING
465 FIRST ST., STE. A
ENCINITAS, CA 92024
619 - 942 -8474
. 3
XP. DAT 12 -31 -93
Z. �s���f ca2►�I �
L k 4 D use —� F2cr
mid
A, 4 w /+4R Q100 = 0,45(44) (1. Oc��
or �oTA� Q� ��zow vrrc� Olktcs.
Q = .15 o) - Z.ZSc *7s
Diameter (inches) ... 24 Mannings n ....... .016
Slope (ft /ft) ....... 0.1700 Q (cfs) ........... 2.25
depth (ft) .......... 0.24 depth /diameter ... 0.12
Velocity (fps) ...... 10.75 Velocity head .... 1.79
Area (Sq. Ft.) ...... 0.21
Critical Depth ...... 0.52 Critical Slope ... 0.0068
Critical Velocity ... 3.46 Froude Number .... 4.71 j
i
Li 0 4 CD V d vJ VI
w/ 4o, - :PAPMIiJ6 W42AP.
TABLE 2 ,
RUNOFF COEFFICIENTS (RATIONAL METHOD)
DEVELOPED AREAS (URBAN) Coefficient s C
SolI Group (1)
Land Use _
A d _ C 0
Residential:
Single Family .40 .45 .50 .55
Multi -Units .45 .50 .60 .70
Mobile homes • -•5 •55 •
Rural (lots greater than 1/2 acr .30 ..3S .40 .45
Commercial (2) .70 .75 .80 .85
80% Impervious
Industrial ( .80 .85 .90 .95
90% Impervious
NOTES:
(1) Soil*Grouo 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 M, the values given for coefficient 1 6 ..may he revise¢
by multiplying 80% or 90% by the ratio of actual ImperviousJlss to.the .
tabulated imperviousness. However, in no case shall the finat.coefficien
be less than 0.50. For example Consider commercial property on D soiI. group
:
Actual imperviousness 50%
Tabulated imperviousness 80X
Revised C O x 0.85 0.53 •
.i
• ' . IV A -9
APPENDIX IX -8
Rev. S /81
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CENTRATION_ 800 5
: 700
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5
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SAN DIEGO COUNTY NOMOGRAPH FOR DETERMINATION
DEPARTMENT OF SPECIAL DISTRICT SERVICES OF TIME OF CONCENTRATION (Tc)
FOR NATURAL WATERSHEDS
DESIGN MANUAL �, ���
APPROVED '� • N �/ +ti DATE APPENDIX X -A
LA -10 Rev. S /81
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