HomeMy WebLinkAboutCT 02-29; CASA LA COSTA; PRELIMINARY HYDROLOGY REPORT; 2003-02-17• . ,•
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Preliminary Hydrology and Detention Calculations
for
PREPARED FOR:
RANCHO LA COSTA LLC
28118 Agoura Road
Agoura Hills, CA 91301
CASA LA COSTA
City of Carlsbad
San Diego County,
California
2/17/03
PREPARED BY:
Pacific Coast Civil, Inc.
30141 Agoura Road, Suite 200
Agoura Hills, CA 91301
Phone: (818) 865-4168
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PRELIMINARY HYDROLOGY & DETENTION CALCULATIONS
Casa La Costa
The proposed Casa La Costa residential development is located southwesterly of the corner
of Levante Street and La Costa Avenue and is bounded by Centella Street on the west and
Rancho Santa Fe Road t9 the southeast. The site can be located on the Current Map (see
attached).
The Existing Site
The property, which totals 4.49 acres in size, is primarily vacant, with the exception of an
approximately one-half acre portion that is c;urrently occupied by a temporary fire station.
The fire station is proposed to be relocated to a permanent location prior to the ultimate
development of the site, and all existing structures will be removed.
Along the easterly and southeasterly, or La Costa Avenue and Rancho Santa Fe Road sides of
the site, a variable height slope descends from the improved roadways to natural lot grade.
From the toe of the roadway slope, the site trends downward from east to southwest at a
relatively uniform rate of approximatdy 5%. Site drainage sheet-flows toward Centella
Street.
The Proposed Pro,iect
The proposed project, consisting of two development phases, is a medium-density attached
residential development consisting of 39 units. Thirty-four of the units are located in Phase
I, while Phase II, which is currently occupied by the above mentioned temporary fire station,
consists of only five units.
A ·looping driveway system, "A" Street, with three access points along Levante Street and
Centella Street is proposed to serve 33 units, including all of Phase II. Proposed "B" Street is
the lone spur driveway, serving six units.
Proposed Drainage
Under this plan, existing drainage patterns will be approximated as possible considering the
size of the proposed buildings. The existing roadway downslope will remain in place
primarily, and the site will drain in a similar east to southwest manner toward Centella
Street.
• The majority of site storm drainage will be transported from local yard basins and driveway
Page 1
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catch basins via small ( 6"-12") PVC gravity drains to the site detention basin. A common use
area at the interior of the site will function as the detention basin during storm events. The
area will be depressed below adjacent grade to achieve the required detention volume (see the
next section of this report). Outflow pipes will allow for only the defined Q to flow during
design storm events to achieve the required detention capability. In an event that storm
flows exceed the capacity of the drain system, a secondary overflow path has been defined
along the common use areas located adjacent to Units 8 throt1gh 6 and between proposed
Units 4 and 5.
A separate low-flow drain system has also been designed to carry everyday nuisance waters
and "first flush" storm waters past the detention basin to a Bio-filtration basin located near
the intersection of proposed "A" Street and Centella Street. This bio-filter will incorporate
hardy turf over a sand substrate and a perforated pipe subdrain system, which will carry the
filtered waters to the parkway drain outfall. The low flow drain system will allow for
unencumbered use of the common areas except during storm events.
Additional detail regarding the Bio-filtration basin function can be found in the Preliminary
Stonn Water Management Plan, prepared by this office and included with this submittal.
Prelimina07 Hydrology/Detention Calculations
The 10-year, 6-hour storm is the control in designing required detention. Precipitation was
determined using the County of San Diego Department of Sanitation and Flood Control
charts II-A-4 and II-A-10. Storm Intensity was determined using the County's Intensity-
Duration Design Chart. Time of concentration (Tc) for the undeveloped condition was
estimated to be 9 minutes based on site drainage characteristics. Tc for the developed . -,·
condition was set at the minimum, 5 minutes, which will yield a more conservative, that is,
larger detention volume calculation. Infiltration shall be ignored.
P6= 1.9 inches
A= 4.49 acres
I(undeveloped)=3.43 inches/hour
_ c(undeveloped) = 0 .3 8 (perennial grass)
Q(undeveloped)=5.85 c.f.s.
I(developed)=5.0l inches/hour
c;( developed)=0. 70 (Residential; multi-units)
Q(developed)= 15.75 c.f.s.
Detention storage volume was cal_culated using the County's Detention Storage Computation
Procedure, Single Hydrograph Form and Hydrograph, copies of which are included herewith.
Reservoir volume was determined to be 3800 cubic feet.
The on-site detention basin has a surface area of approximately 2600 square feet. At depth
of 1.5 feet, the project's calculated detention reqllirement will be exceeded .
Maximum outflow allowed is 5.85 c.f.s. (undeveloped condition)
Page 2
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···-:.·,._
CASA LA COSTA
PLAN DETAIL-DETENTION BASIN
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PROFILE-DETENTION BASIN AREA
_.,.,.___ Low Flow Pipe
~ PREPARED BY: Pacific Coast Civil, Inc.
30141 Agoura Road, Suite 200
Agoura Hills, CA 91301
Phone: (818) 865-4168
8
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10' O' 20'
SCALE: l"= 20'
NOTTO SCALE
1.5' min.
-----
Current Map
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tA>bA LA u»-rA-
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COUNTY OF SAN DIEGO
DEPARTMENT 0~ SANITATION &
FLOOD CONTROL
10-YEAR 6-HOU(j P~ECIPITATm~J
l
Of 10-YEAR G-{~nun
45'
30 1
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15 I 1 · -, . I i, I I < r '
33°
45' -1-----+-----1--:---·'f-l-r.d.1.11.11 I ___.. i
-a--·---•·----•-------•
p,.p,fr•d by
U.S. DEPARTME~T OF COMMERCE
NATIONAL OCEANIC A:-1D A1l:os1>11f.:R1C ADMINISTRATtON ,,
SPEC1At. STtJDIE~ BRASCH, OFFICE OF l~'DROLOGY, NATIONAL WEATHER SERVICE
30'
118° 45' 30' 15 I 117° 45' 30'
•
15 I 116°
• • . . COUNTY OF SAN DIEGO •
DEPARTMENT OF SANITATIOn S.
FLOOD CONTRO.L \ 10-YEAR 24-HOU1R PRE'.CJPIT ATION
, ,...20...,.. ISOPlU\flALS bF lO-YEAR 24-HOUR
45 1 ''l;)J{'i~ ~< -.. ~
30 1 . ·p, '\ 'l[.; I .. Ct {
15'-1-----1------i
33°
45, t--~r-7-----_.
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· NATtOl'fAL OCEANtC AND A"rJ.10Sl'IIF.RlC AD:O.IINlSTRATtON j
Pl!CtAL STUDIES DRA~CII, o~·r-1cr;: o~· 1fvotWLOClY, Nt\T!ON:-4'?. WEATHER s1Ht~CI!! 1
P~p.(,~d by
U.S. DEPARTME1~T OF COMMERCE
30',----t--~+---i+--===~==
118° 45 1 30 1 15 I · 117° 1~5 I 30 1
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MintrtP<:
INTENSITY-DUAAT DE·· CHART •
,_.._._"91-l•l,,.L.L..I. 1,-.,,. I 1111 i, 1.1,11
2 . 3 4 5 6
1-lnir.,..e
Directions for Application:
1) Froq1 preci:pi tat ion maps detenni ne 6 hr. and
24 hr. amounts for the selected frequency.
These maps are printed in the County Hydrolo9y
Manual no, 50 nnd 100 yr. maps included in th
Oesigrt and Procedure Manual).
2) Adj9st 6 hr. precipitation (if necessary) so · that it is within the range of 45Z to 65% of
the.24 hr. predpitation: (Not i'lrrlicable
to Desert)
3) P-l~.t 6 hr. precipitation on the rinr:t zide
. of the chart.
4) Draw a line through the point parallel to the plotted lines .
. 5) This line is the intensity-duration curve for
the location being analyzed.
~
Selected Frequency \O yr.
P5 d:: } ,1 in., p24= ~-l ' * p 6 = (g' %*
2) Adjusted *P = f.~ ~4
6 in .
3) t = .9 min. C
4) I IZ · g, 4 3 in/hr.
*Not Applicable to Desert Region
.I APPENDIX XI
IV-A-14
Rrqri ,0rl 1 /.Qc;
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TABLE 2
RUNOFF COEFFICIENTS (RATIONAL METHOD)
DEVELOPED AREAS (URBAN)
Land Use
Residential:
Single family
. Multi-Units
Mobile Homes
Rural (lots greater than 1/2 acre)
Corn rnercial (2)
8096 Impervious
Industrial (2)
90% Impervious
NOTES:
(1) Type D soil to be used for all areas.
--·.:---..-~ ~
Coefficient( C
Soil Type 1)
D
.55
.70
.. 65
.45
.85
.95
~ .... , I ..
(2) Where actual conditions deviate significantly from the tabulated·
imperviousness values of 8096 or 9096, the values given for coefficient C,
may be revised by multiplying 8096. or 9096 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 D soil.
Actual imperviousness = 50%
Tabulated imperviousness = 80%
Revised C 50 0.85 0.53 ;. = 80 X =
82
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Read: 1Nerh11o' /low/ime ,/.Y Jltnule.s
SAN 01 EGO COUNTY
DEPARTMENT OF SPECIAL DISTRICT SERVICES
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URBAN AREAS OVERLAND TIME
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OJ/01/2002 11:18 FAX l4l 0521054
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DETEN'rION STORAGE COMPUTATION PROCEDURE
SINGLE HYDROGRAPH FORM
Input.Variables (Urban Conditions}
ID1r six hour pre<;:iipitation alll.ount (inches)
Time of concentration (min.)
coefficient of runoff·
Basin area (acres)
Computation
. .
Time to peak .
'.rl! -2.0'l'cl{n/(1 + Kp} = 1.l072Tc (1.101-i..)(5)
Time of hydrograph to begin
TB = 20 -T, ( '2.,0 -'?,S~)
Time of hydrograph to end ( ( :'I
... _____ . .T6 = 20 +. 1. 5 T, . "z,o + I · S' '?,'?3);
Peak flow ( ) / ?l ~ = CIA (O,?t>) 5.0/ ( 4,4&/
lTe -7. 44 P4/T 0.6(5 =-5.-0 I in. /hr.
7. 44-(\.'~)7 so,b'fl'
surrounding flow ((4)
Depth of precipitation for 2 hours
D120 --7.44 P,/120°-"5(2 hr.)
0120 ..,_ 0. 6785 P6 = /, '2!) in.
Depth of ~recipitation for hydrograph
DH = (P~Te :J5Sl/5. 8.3 = 0.58 in.
p6 /. :3
Tc 5
C 0, 70
A 4.4-~
TP 553
Tn 14.47
TB .za .. 3o
Qp /5, 75 c/s
(0 .,;s 03~ J _$'; '07
SUJ,'.'rounding Intensity
!11 = 60(D~ -Di!)/(120 -2.S'l'c}~ ~0(1.'t~-0.78)/(1?.0·'l,S(S)) .-···
I 5 = 0,1Q .in./hr. .
0s ~ CJ:sA (o,1o)(t1,40)(4.4~) Qs /.2.h t:,f.f
Plot Hydrograph and surrounding ll'low·
outflow/ Basin Si2e (Natural Conditions)
1. Plot on Hydrograph
a. Draw line from surrounding flow intercept with
beginning hydrograph limb to QN
2. Estimate volwne needed for reservoir
a. Determine preliminary reservoir di~ensions
b. Surrounding flow discharges directly through
reservoir without detaining any storage
3 • Size outlet works ·
a. Outlet flow, 0o less than or equal to QN
b. stay within the limits of the reservoir
4. Rout
a. Refine reservoir dimensions and/or outflow
faoi1ity smek.liy6
I
.. PACIFIC COAST CIVIL, INC.
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30141' AGOURA COURT, SUITE 200
AGOURA HILLS, CA 91301-4334
PH: (818) 865-4168 FAX: (818) 865-4198
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PREPARED BY: DEVELOPED CONDITION HYDROLOGY MAP FOR SHEET
PLANNING
ENGINEERING
SURVEYING
HUNSAKER
& ASSOCIATES
SAN DIEGO, INC
11Jl79 Huellllckcns Street
San Diego, Ca 92121
PH(858)558-4500• FX(858)558-1414
VILLAS DE LA COSTA 1
OF
CITY OF CARLSBAD, CALIFORNIA 1
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PREPARED BY:
PLANNING
ENQNEERING
SURVEYING
HUNSAKER
& ASSOCIATES
SAN DIEGO, INC.
10179 Huennekens Street
San Diego, C,a 92121
PH(858}558-4500· FX(858}558·1414
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