HomeMy WebLinkAboutTract Map 9833 Lot 16 Hydrology & Hydraulics
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LAKESHORE
Engineering
Consulting Civil Engineering and Geologists
October 29, 1999
Project No: 99-064.HYD
Client: Mr. Cecil Stralow
31275 Sierra Bonita
Temecu1a,CA 92592-3100
(909) 302- 0199
Subject: Hydrology and Hydrologic Study
End of Swales, Rip-Rap Locations
Lot 16 Tract No. 9833
43978 El Lucero Place
Reference: Precise Grading Plan
Single Family Development
Scale 1"= 30' (P.N. 99-064.GP)
Gentlemen:
As per your request, we have performed hydrology study for the
watershed areas feeding to the end of swales as shown on the
reference grading plan.
The hydrology study was conducted using the Rational Method as
outlined in the Hydrology Manual (County of Riverside Flood Control
Manual) and their water flows are noted on the grading plan.
Q-100 yr discharge onsite varies from 0.33 cfs to 3.81 cfs were
obtained for the study areas. Based on the calculated water flows,
proposed rip-rap details and drainage features shown on the precise
grading plan should be considered adequate for its intended use.
If you have any questions,
convenience.
please call this office at your
~-
Fe
RC
0/00
RECEIVED
NOV 4 1999
C,F'{ OF TEMECULA
.:NGiNEER1NG DEPARTMENT
Att:
_J
cc: copy to city and copy to client
31740-2 Railroad Canyon Road. Canyon lake, CA 92587 . (909) 244-2913 . FAX: (909) 244-2987
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INDEX M.N'- ...:._~~'.
OF . 0-.-' ,_ _ . .-
STRAi..OW PROPERTY - .
LOT 16, TRACT 9833
43978 EL LUCERO PLACE
CITY OF TEMECULA
RIVERSIDE COUNTY
CALIFORNIA
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. 31740-2 RAILROAD CANYON ROAD
CANYON LAKE. CA 981S87
(909) 2"'2913.- PAX: (909) 2...2917
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PLATE 0-3
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HYDROLOGY J'YJANUAL
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RUNOFf, COEFFICIENT
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COVER TYPE-URBAN LANDSCAPING
AMC II
(RUNOFF INDEX NUMBER 69)
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INSTRUCTIONS FOR RATIOOAL ME'l'lIOD HYDROLOGY CALCUIATIONS
--------
(Based on the Rational FO%1llUla~ Q . CIA)
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1. On map of drainage area, draw drainage system 'and block off subareas
tributary to it.
2. Determine the initial tilDe of concentration, "T", using Plate 0-3.
The initial area shOuld be less than 10 acres, have a flow path of
less than,J..,-OOO feet, and be the most upstream subarea.
,"--..--. .
3. using the time of concentra.tion, dete:cnine "I", intensity of rain-
fall in mcnes per hour,. 'from' the appropriate intensity-duration
curve for the particular area under study. For areas where stan-
dard curves are available, use Plates 0-4.1 and 0-4.2' to reproduce
the standard curve. For areas where curves have not been published
by the District, use Plates 0-4.3 through 0-4.7 to develop a suit-
able intensity-duration cu~e.
I
4. Determine "C", the coefficient of runoff, using the runoff coeffi-
, cient curve which corresponds as closely as possible with the soil,
cover type and development of the drainage area. Standard curves
(Plates 0-5..1 through 0-5.4) have been developed by the District
for the common case of urban landscaping type cover. Where these
curves are not applicable, curves may be developed using Plates
0-5.5 through 0-5.8.
5-. Determine IIA ", the area of the subarea in acres.
/'
6. Canpute Q = CIA for the subarea.'
7. Measure the length of flow to the point of inflow of the next sub-
area downstream. Determine the velocity of flow in this reach for
'the peak Q in the type of conveyance being considered (natural
channel, street, pipe, or open channel), using the tabling aids on
Plates D-6 through 0-9.
'Using the reach length and velocity determined above, canpute the
travel time, and add this time' to the time of concentration for the
previous subarea to deteimine a new time of concentration.
8. Calculate Q for the new subarea, using steps 3 through 6 and the
new time of concentration. Detennine "Qp" , the peak Q for all sub-
areas tributary to the system to this point by adding Q for the
new subarea to the sUllUllation of Q for all upstream subareas. Deter-
mine the time of concentration for the next subarea downstream using
Step 7. Continue tabling downstream in similar- .fashion until a
junction with a lateral drain is reached.~' .
RCFca WCD
HYDROLOGY MANUAL
RATIONAL METHOD
INSTRUCTIONS
~
PLATE 0-1 (I of 21
I
II
I
I
I
I
I
I
I
I
I
I
I
I
I
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J
I
I
".
9. Start at the upper end of the lateral'and' table ,its 2 down to the
junction with the main Line, using the IIlllthods outJ.ined in the
previous steps.
10. Compute the peak 2 at the junction. Let 12Jl., TA, IA correspond to
the tributary area with the l~er' time of' concentration,. and. ,l2s..
Ts, IB correspond to the tribu~area with, .the shorter time of
concentration and Qp,' 'rp COrr&fpond to. the .peak 2 and time of '
concentration. . .~, ". ".'. '. ,
a. If the tributary areas have~e same time of concentration,
the tributary 2' s are added ;'CUrectJ.y to obtain the ,combined
peak 2. '
.'" .
2p-QA+2B
'rp -,'TA' - 'l'B
b. If the tributary areas have different. times .of concentration,
the smaller of the tributary. 2's IIlUSt be corrected as .follows. .
"
(1) The usual case is .where the tributary area .with the lon-
ger t:l.me of concentration ,has, the larger 2. ' In this case,
the smaller 2 is corrected by a ratio of the intensities
and added to the larger 2'to obtain the combined peak Q.
'l'he tabling is then continued downstream using the longer
time of concentration. '
. 7
...'"
Qp - I2Jl. + 2B IA
IiJ
. 'rp -' 'rA.
: ~ ;-.. .
"'<"':
,'. ..':, -
(2) In sane cases, the tributary area with the .shorter t:l.me
of concentration has the larger Q. In this case, the
smaller Q is corrected by a'ratio of. the t:l.mes of concen-
tration and added to the larger '2 ,to obtain the combined
peak Q. 'l'he tabling is 'then continued downsteam using
the shorter time of concentration.
Qp-Qa+QATs
TA
'rp :~"1B .
~-
:-~.::~ .-". .~~~:'
RCFC a weo
HYDROLOGY MANUAL
"
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RATIONAL "METHOD
INSTRUCTIONS
~
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