1994-3993 G
Street Address
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Category
Serial # .
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67
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Description
Name
Year
Plan ck. #
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San Diego Land Surveying and Bngineering~ Inc.
9474 Chesapeake Drive. Suile 907. San Diego, California 92123-1027
Phone <619)-565-8362 Fax <619)-565-4354
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OFFICERS & DIRECTORS
MEMBERS OF:
CALIFORNIA LAND SURVEYORS ASSOCIATION
AMERICAN CONGRESS ON SURVEYING & MAPPING
HERMAN W. BATEMAN, loS.
VICTOR T. WIGLESWORTH. R.C.E.
ROBERT J. BATEMAN, loS.
SAN DIEGO FINANCIAL CENTER
DATE: AUG. 12. 1994
DWG. NO. 3993-G
HYDROLOGY CALCULATIONS
THE SITE IS PRESENTLY A GRADED, UNDEVELOPED, TWO ACRE PARCEL OF LAND.
ZONE 1 DRAINS TO AN EXISTING DRIVEWAY AND THEN TO ENCINIT AS BOULEVARD.
AN EXISTING DE SILTING BASIN IS TO BE IMPROVED.
THE DESIGN STORM IS 50 YEAR.
C = 0.45 (UNDEVELOPED) APPENDIX "A"
Tc = 12 MIN. SEE APPENDIX "B"
I = 3.36 PER APPENDIX "c"
Q=CIA
ZONE 1 AREA = 1.939
Q = CIA = .45 X 3.37 X 1.939 = 2.94 CFS
A SYSTEM OF SANDBAG BARRIERS WILL ACT AS A DE-SILTING AND RETENTION BASIN
BEFORE THE WATER IS PASSED TO THE PUBLIC RIGHT OF WAY.
CAPACITY OF EARTII BERM = 37.5 X 3.5/2 X 100/27 = 243 CY
FROM CITY OF CARLSBAD TEMPORARY DESIL T A TION BASIN CAPACITY TABLE:
AREA 2 ACRES OR 1/5 OF 10 ACRE ROW AT 10% = 400 1 5 = 80 CY (SEE APPENDIX "D")
SPILL WAY PER D-22 CALc.
CAPACITY:
AREA = 89 SQ. FT. WP = 30.63 IN. N = .024
Dn = 8" V = 11.32 FIS
S = .1361
Q = 10.08 CFS
NORMAL DEPTH:
AREA = 0.33 SQ. Fr.
TRY: Dn=4"
WP = 19.31 IN. N = .024 S = .1361
V = 7.94 FIS Q = 2.62 CFS
Q = 2.94 CFS
DEPTII OF FLOW IN THE 8" DEEP SPILL WAY WILL BE 4 INCHES.
, ,
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MICHAEL L. TII, RC 35471
MY REGISTRATION EXPIRES 9/30/95
AUG 1 7 1994
PROJECT ENGINEER
PARCEL MAPS. SUBDIVISIONS. CONDOMINIUM & PROPERTY SURVEYS. A.loT.A. SURVEYS. GRADING & IMPROVEMENT PLANS
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RU¡";OFF COEFFICIENTS (RATIONAL ~1ETHOD)
L\ND USE
Coefficient, C
Soil Group :1:
.-\ B C W
Undeveloped .30 .35 .40 ~j5
ResiJential:
Rura 1 .30 ..);¡ .40 ..1:)
Single Family .40 .45 .50 .55
~!ulti-Units .45 .50 .60 . :-0
~!obile Homes (2) .1 ~ .50 .55 .65
.-.;¡
Commercia 1 (2) " ..' ,70 . ,;¡ .80 .35
80% Impervious
Industrial (2) .SO .85 .90 .95
90% Impervious
NOTES:
.
.
(1) Obtain soil group from maps on file with the Department of Sanitat:~n
and Flooå Control.
(2) Where actual con¿itions d~viate significantly from the tabulated
imperviousness values of 30% or 90%, the values given for coefficie~:
C, may be revised by multiplying 80% or 90% by the ratio of act~al
imperviousness to the tabulated imperviousness. However, in no c~se
shall the final coefficient be less than 0.50. For example: Cons:Jer
commercial property on 0 soil group.
Actual ~perviousness
= 50!ó
Tabulated im?er¡iousness = 80%
Revised C"= ~ X 0.85 = 0.53
AP?ENDIX IX
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, , SAN DrEGO:- COUNTY
DEPARTMENT OF SPECIAL DISTRrcr-SERVICES
,DES I GN MANUAL
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DATE /2..!¡!{.'9--
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2
Hours
3
4
5
6
r~inutes
Our-a t 1 on
Directions for Application:
1) From precipitation r:1aps detennine 6 hr. and
24 hr. amounts for the selected frequency.
These maps are printed in the County Hydro1o9Y
Manual (1O, 50 and 100 yr. maps included in the
Design and Procedure Manual).
2) Adjust 6 hr. precipitation (if necessary) so .
tha t it is within the range of 45% to 65% of :
the 24 hr. precipitation. (rIot «rrlicable f
to Desert)
3) Plot 6 hr. precipitation on the riGht $ide
- of the chart.
t = J L mi n.
c
I = .3,':>I_in/hr.
*Not Applicable to Desert Region
II II
APPeNOC X C:mL.. 4
---'." -- -"'. -....
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50-YEAr: (HUmr rltECIPITA1¡m,j
'-20./ ISOPLUVIALS IOF 50- YEAn G..HOUR
DEPARmENT OF SANITATION &
FLOOD COflTI10L
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ArrUJDI X --C
COUNTY OF SAN DIEGO
DEPARTMENT OF SAN nATION &.
FLOOD CONTROL
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301
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1180
1;5'
30'
15 I
15 I
11 Go
API)ENlJIX a-c.
LENGTH PER PLAN
I.4IN. 18"Ø C.S.P.-12 GA.
S~Alll<RO:GHOUT
,-
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PER PLAN, 6' MINIMUI.4
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WIDTH, LENGTH, RIP-RAP SIZE
AND FILTER ROCK SIZE PER PLAN
STANDPIPE-18"Ø PIPE,MINIMUM
WITH NO PERFORATIONS
PLAN VIEW
NTS
6 REBAR,SPACED
"O.C. AROUND
ISER CIRCUMFERENCE
STEEL PLATE
3/8"x 12"x
3'+ PIPE 0.0.
SEE SECTION 300-6
STD. SPECS.
SLOPE PER PLAN,
~Z; ~INI~~
I ~ ~560-~-3250 CONCRETE 'T SECTION À-A .. SDRS 0-70 CHANNEL OR .b. ill
SE ~ANCHORS PER PLAN N NTS RIP RAP PER STD. 0-40
IIIE . 3'+0.0. OF
I I §ïï, DRAIN PIPE
III En 4'+0.0. OF BASIN CAPACITY TABLE
1111 DRAIN PIPE N ( IN CUBIC YARDS)
SECTION 8-8 DETAIL A
N~ N~
1 1/2"x 2" A-36 STL ANGLE
4 LOCA TlONS
I/Z"Ø M8 w/ NUT & WASHER
NOTES:
1) DESILT A TlON BASINS BUILT
ON LOTS ADJACENT TO
D'M:LlINGS SHALL BE
COMPLETELY LINED WITH
3" GUNITE.
2) ALL STEEL PIPE AND
HARDWARE TO BE HOT
DIP GALVANIZED AFTER
FABRICATION.
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:;¡¡:;¡¡
N"'I
x
-<
:;¡¡
ÌD
SIMILAR TO
SDRS 0-70
2: 1 OR FLA TTER IF SO
SPECIFIED ON PLANS' .
TYPICAL THROUGHOUT
DET AIL 8
NTS
TRACT AVERAGE SLOPES
AREA 12% 15%
(ACRES) 2% 5% 8% 10%
10 270 350 370 400 450 500
15 400 420 460 600 675 750
20 540 700 740 800 900 1000
40 1080 1400 1480 1600 1800 2000
80 2160 2800 2960 3200 3600 4000
100 2700 3500 3700 4000 4500 5000
150 4000 4200 4600 6000 6750 7500
200 5400 7000 7400 8000 9000 10000
R V. APPROVED DATE
CITY OF CARLSBAD
TEMPORARY
DESIL T A TlON BASIN OUTLET
AND CAPACITY TABLE
CI INEER
SUPPLEMENTAL
STANDARD NO.
DATE
DS-3