HomeMy WebLinkAboutRP 12-31; Bluewater; Redevelopment Permits (RP) (3)•
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DRAINAGE REPORT
FOR
BLUEWATER RESTAURANT
3162 CARLSBAD BOULEVARD
APN 203 -250 -28 & 29
PREPARED FOR
Barry Blue
2950 Ocean Street
Carlsbad, CA 92008
PREPARED BY
Robert 0. Sukup
4322 Sea Bright Place
Carlsbad, CA 92008
760-720-0098
May 2, 2013
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The proposed project is to remove all the existing residential housing units on the
.42 acre site, slightly regrade the site, and construct a new Restaurant and
Brewery. Carlsbad Boulevard will remain as is.
Almost all of the proposed paving is going to be pavers that will drain into
landscape treatment areas. The pavers have a positive impact on promoting
filtration and infiltration.
A small portion of the back half of the site presently drains to the east towards
existing apartment buildings. A new masonry wall is proposed for the rear
property line and the side property lines in the rear as well. As a result of this,
and wanting to relieve the eastern properties of any flows they have been
receiving to date, I now have everything draining to the west. I have designed the
project to flow into several area drains in the rear of the lot with the water
ultimately discharging into Carlsbad Boulevard. Once in the street, it flows
21 0 feet southerly where it enters into the City Drainage System and into an 18"
RCP at the northeast corner of Carlsbad Boulevard and Pine Avenue. From that
point the drainage waters continue an additional 180' in an 18" RCP where it
exits at the toe of the bluff, before beginning to make its way across the sand to
the Pacific Ocean.
The following calculations show the onsite flows and the capacities of the small
(4" and 6" pipes) private drain lines that enter onto Carlsbad Boulevard via a 0-
27 drain. A grate inlet will be provided on the upstream side of the D-27 pipe to
act as a secondary outlet for large storm events.
I have also provided calculations and plans that show the affected drainage
basin, the projected flows, the plans of the existing storm drain pipes in Carlsbad
Boulevard, and confirmation of adequate capacity in the existing system.
I have made sure in my on site design that I have secondary sheet flow outlet so
the building will be safe from any flooding.
Likewise, the drainage at the intersection of Carlsbad Boulevard and Pine
Avenue has a built in secondary outlet via the A. C. maintenance road that goes
down to the rip rap and beach sand at the ocean.
In my professional opinion, the drainage concept I have proposed will work very
well and not cause any offsite/downstream siltation, erosion, or flooding .
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HYDRDLDG'/ CALC-S
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···--.. _)_,. ············-.. ··--· ·--------·-·" ~--------.. ------------
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l-\'f C~OLO~Y MAP
"St.~WA le:R..-Roe.. S"T A\} RA A),..
j
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I I ·.!
de
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HYDROLOG\C SOlL MAP
SAN L\l\S R't'/
S \-\~ E\ '2. 'Z.
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San Diego County Hydrology Manual
Date: June 2003
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Section:
Page:
Table 3-1
RUNOFF COEFFICIENTS FOR URBAN AREAS
Land Use Runoff Coefficient "C"
Soil Txpe
NRCS Elements County Elements %IMPER. ~ B -Undisturbed Natural Terrain (Natural) Permanent Open Space 0* 0.20 0.25
Low Density Residential (LDR) Residential, 1.0 DU/ A or less 10 027 0.32
Low Density Residential (LDR) Residential, 2.0 DU/A or less 20 0.34 0.38
Low Density Residential (LDR) Residential, 2.9 DU/A or less 25 0.38 0.41
Medium Density Residential (MDR) Residential, 4.3 DU/A or less 30 0.41 0.45
Medium Density Residential (MDR) Residential, 7.3 DU/A or less 40 0.48 0.51
Medium Density Residential (MDR) Residential, 10.9 DU/A or less 45 0.52 0.54
Medium Density Residential (MDR) Residential, 14.5 DU/A or less 50 0.55 0.58
High Density Residential (HDR) Residential, 24.0 DUIA or less 65 0.66 0.67
High Density Residential (HDR) Residential, 43.0 DU/A or less 80 0.76 0.77
__....,. Commercial/Industrial (N. Com) Neighborhood Commercial @ (IE) 0.77
Commercial/Industrial (G. Com) General Commercial 85 0.80 0.80
Commercialflndustrial (O.P. Com) Office Professional/Commercial 90 0.83 0.84
Commercial/Industrial (Limited I.) Limited Industrial 90 0.83 0.84
Commercial/Industrial (General I.) General Industrial 95 0.87 0.87
c
0.30
0.36
0.42
0.45
0.48
0.54
0.57
0.60
0.69
0.18
0.78
0.81
0.84
0.84
0.87
3
6of26
D
0.35
0.41
0.46
0.49
0.52
0.57
0.60
0.63
0.71
0.79
0.79
0.82
0.85
0.85
0.87
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*The values associated with 0% impervious may be used for direct calculation of the runoff coefficient as described in Section 3.1.2 (representing the pervious runoff
coefficient, Cp, for the soil type), or for areas that will remain undisturbed in perpetuity. Justification must be given that the area will remain natural forever (e.g., the area
is located in Cleveland National Forest).
DU/A =dwelling units per acre
NRCS =National Resources Conservation Service
3-6
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County of San Diego
Hydrology Manual
Rainfall Isopluvials
100 Year Rainfall Event-6 Hours
N
lsopluvial (inches)
THIS Mtt.P IS PRO\I10EO WITHOUT WNIIU.tm OF ANf ~. UTHER l.liPRE&$ Ofi.IMPUEO.INa.UOING, 8Ul HOt UMII'ED TO, THfr.FUEOWARIUrHTIES OF~TAIIUTYNCJFITNI!SSFortANRliC\l.NtiVIPOSE, ~Sa>OtS.AI~~
Tlll•pnoduc:ta...aycorv4nlnlorlriMIQnltom ... SNC!o\GReglanll _..,.~S,.......'MIIC:IIcarw>lbl~-.. -pwm•noondSANOAG. ,,...,_""-1'_......_.\'lotidl,..,...,............,...,
-·""'·-...,~·-· .......
3 0 3 Miles ~P"""!5iii-~~
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County of San Diego
Hydrology Manual
Rainfalllsopluvials
100 Year Rainfall Event-24 Hours
lsopluvial (Inches)
f)P\\1 ~GIS
~g/i'..;olc-W..·~ ~.~ ............... 1-~··-.. -!> .. ,..,~,
N THIS WoP IS PR0\110£0 'MTHOUf WARAAKTY 01' Nff ICII«<, EITHER IEXPN':A OI!.IUPUED.INCtuotoiG.BUT NOll-..m;DTO, THI!IIoFLIEOWAAANrfllES
s
0#' MEACHMITABIUJY ANO FITNESS I'Oft A PAR11CULAR f'\MPOSE. ~S...aiS.M~t"-"d..
l"'-PfOduCll_,caruonw-f,_""'&NtDJ<G~ E= ... ~·~--... TIQ""*"""""_........._wtlk:ll .... bftnr•lldt.lcaoil..., _gt ..... IIJT'-s ........... .
3 0 3Miles
~
10.0
""'
~ I"' I' 9.0 " .....
8." ' ~ ...... " 7.0 ~ ~ ~ ~ ..... ""'
"' ....
""'
..._I' ~I• ~"" "" e.o
...... ""' ~ ... 4/6 ..... i'o. 5.0 ..
~ -~ " ~ .... to
4.0 'J ~
~I' .. .........
!'. ....
.. ....
I ..... ~ 3.0 i ..... ' l' .....
""'
. .. ,...,
2.0 I .... ~ l I ! .....
"C '~ j ... l I s;1.0 r i 0.8 I
0.7 I
0.6 !
I !
0.5
0.4
I
0.3
15
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20 30
Minutes
40 50 1
Duration
"~
.... ~ .... I'
'" 1 ... r... ~ J: ~ ~,..., .. "" g
i' .... r... '
..,
"'0
'r.... ~ "'l'o.
6.01 ..... 5.5 g: ' ... 5.0
...... 4.5w
......... 4.0 i
3.5 ...... ...
1 ... .... 3.0
.. ... 2.5
...... !'. ,, 2.0
" • 1.5
...
1.0 -
2 3 4 5 6
Hours
Intensity--Duration Design Chart -Template
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Dlrecttona for Application:
(1) From precipitation maps determine 6 hr and 24 hr amounts
for the selected frequency. These maps are included In the
County Hydrology Manual (10, 50, and 100 yr maps Included
In the Design and Procedure Manual) .
(2) Adjust 6 hr precipitation (if necessary) so that it is within
the range of 4SOk to 65% of the 24 hr precipitation {not
applicaple to Desert).
(3) Plot 6 hr preclpltatlon on the right side 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
beir · qlyzed.
Application Form:
{a) Selected frequency 1iQ_ year
(b) P6 = ~ln .• P24 = .1__ .~ = fo3 %<2)
I 24
{c) Adjusted P6(2l = ~in.
(d) tx = _8__ min.
(e) I = 4~ S in./hr .
Note: This chart replaces the lntensity~Ouration~Frequency
curves used since 1965.
FIGURE
3-1
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l\1t: ATTAC~cD AREA 14'1 D ROLO&'j ~MO~ THE
DRA\fJA<;e-AReA WE ARE. WORKING WITH
~~~ fRoPo~t.lJ T3L.OE.WATt.'R. PRe.:rec-r \s UJITJt '"' ~' ,,
AREA 1. US\~\6 T~c C ~I VALUt:,~ DEVELOPED
Fort tHE 0~ ~rT€ LJ.loR~ 1 THE: G:l FO~ At;.EA I::
~ = c \A ; ,. '7b x 4. 8 )( '· sz. = ,,z? c::rs
1"\'S O~HJA6t: ~~iSIL~ IN!() AN )8° l:iRAJt-..1 @
'"~ N~ cowe.-e_ or=-PINE ~cAR.L~ SA£> '81.)..J[J .. T~C. \8 11
@1 2% HAS A CAPAciTY or 14.0) cf"s /(,.21•0r/
lt\t lcrrALr 'BASIN HA~ AN Af.~A OF ~,48 A:ReS
DJt\\C\1 Af..L. ~IJTERS JNT6 A \B 11 l<CP~ 1,74%
0..,-o\At.. .:-c JA ~. 1 b )14. 2 x 4,4o--'23.6 cfs
cA'f'ACrT'/ oF l8')RCP~ 1/11% ~ 2~ .. ;,+1 >(lSc:fs= OK t/
THt YLAf'\ \1\B-Ws f fROl=IU:~ Ot= IHE 6ilSTJ~G
~\O~K D~Af lJ.S A-r -rUE tH1e;RStCliOJ...\ Or
Cl\t<Sl3AO ~L.VD f Plt-.:le A\/E. ARt ATTAG~E,b
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