HomeMy WebLinkAboutRP 10-02; 7 Eleven Store; Redevelopment Permits (RP) (3)•
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DRAINAGE AND STORMWATER
IMPROVEMENTS REPORT
PREPARED BY:
FOR
7-Eleven
Carlsbad Village Drive
CARLSBAD-CALIFORNIA
T A I T
CONSUL T/NG, INC.
702 Civic Center Drive
Oceanside, CA 92054
Phone 760 433-1166
Fax 760 433-101 7
NOVEMBER 2010
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DRAINAGE AND STORMWATER
IMPROVEMENTS REPORT
DISCUSSION
Purpose
Vicinity Map
7-Eieven, Carlsbad Village Drive
TABLE OF CONTENTS:
Description of Watershed-Pre-developed Condition
Description of Watershed-Post-developed Condition
Hydrology Calculations
Hydrology Conclusions
Hydraulic Calculations
Hydraulic Conclusions
CERTIFICATION AND SIGNATURE
1
1
1
2
2
5
6
7
8
EXHIBITS: Exhibit
DRAINAGE BASINS
SOILS HYDROLOGIC GROUP MAP AND SOILS INFORMATION
RUNOFF COEFFICIENTS FOR URBAN AREAS
INITIAL TIME OF CONCENTRATION (Table 3-2 and Fig. 3-3)
INTENSITY-DURATION DESIGN CHART-TEMPLATE
ISOPLUVIAL MAPS
1
2
3
4
5
6
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INTRODUCTION:
The purpose of this project is to upgrade an existing gas station and convenience store. The upgrade
will include new parking striping, handicapped access, a trash enclosure, etc. As a result of these
improvements, the applicant is required to provide for storm water quality improvements. These
improvements will include filters in the new building roof drains, pervious pavement under the ADA
access walkway, a vegetated swale, an oil water separator, a trench drain and a pipe draining the water
from the oil water separator. The purpose of this study is to determine the rate of flow into these
drainage devices and determine the required sizes of these improvements.
VICINITY MAP ------------------
PROJECT SI1E
0
NORTH
NTS
This study is based upon the methodology in the San Diego County Hydrology Manual (SDCHM),
dated June 2003.
Description of Watershed:
Pre-construction Drainage:
The property lies in an urbanized area at the southwest comer ofl-5 and Carlsbad Village Drive.
The runoff basin is predominantly roof and pavement, with small amounts of landscaping. The
grades are flat, generally at 2% or less.
Rainfall currently flows from the roof of the building and pump canopy onto the existing pavement.
Runoff on the existing pavement flows to the northwest, across the sidewalk, into the gutter of
Carlsbad Village Drive .
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Post Construction Drainage:
No changes are proposed in drainage basin boundaries.
Rainfall will flow from the roof of the structure, via downspouts, onto the existing pavement.
Filters will be installed in the downspouts. From there, the site slopes to the northwest, towards
Carlsbad Village Drive.
The runoff from the gas pump canopy will flow onto the existing pavement and overland to the
street. Runoff from the pump apron pavement will flow northwesterly to a proposed trench drain.
The trench drain will intercept this flow and direct it into an oil water separator. The separated
water from this device will flow, via a pipe, into the back of an existing storm drain inlet in the
southerly curb of Carlsbad Village Drive.
Runoff from the roof will flow into a vegetated swale, which will flow to the north, into an
landscape inlet. Runoff will flow from there, via a pipe, into the back of the existing curb inlet on
Carlsbad Village Drive.
The proposed ADA path of travel, along the northeasterly edge of pavement will be paved with a
porous pavement to reduce runoff from the site.
HYDROLOGY CALCULATIONS:
Hydrology Parameters:
P6 and P24 are obtained from the SDCHM Isopluvials. The adjusted P6 is determined based on the
guidelines in the Manual Figure 3-2 .
The soil type for this area is determined from the US Department of Agriculture, Natural Resource
Conservation Service WebSoilSurvey. This information shows that the site is underlain by soils of
Type MiC. The soils are in the Type B Hydrologic Soils Group.
Table 3-1 of the County Manual gives us Runoff Coefficients:
Runoff Coefficients
* Reduced due to pervious pavement in the accessible walkway.
Since the drainage basins are small, paved and fairly flat, the times of concentration will be
calculated based on Figure 3-3 to determine the initial flow length.
We will use an ''n" value of 0.0 I 3 for the proposed PVC pipes .
To determine the required volume of storage on the site to meet storm water quality requirements,
we will use the 85th Percentile Precipitation from the isopluvial map, which is 0.62 inches.
Page2
• Pre -Construction
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Basin
A1
2 Year
Storm
From Hydro
Manual Fig
3-2
1.22 1.82 67% 1.18
1 0 Year 1.65 3.01 55% 1.65
100
Year
Pump
Area
Basin
A2
Roof
Area
(B1)
Side-
yard
(B2)
Land-
scaped
Area
(B3)
Totals
2.55 4.5 57% 2.55
1.22 1.82
1.65 3.01
2.55 4.5
1.22 1.82
1.65 3.01
2.55 4.5
1.22 1.82
1.65 3.01
2.55 4.5
1.22 1.82
1.65 3.01
2.55 4.5
1.22 1.82
1.65 3.01
2.55 4.5
2
Year 1·18
10
Year 1·65
100 Yr 2.55
Year
2 1.18
10
Year 1·65
100 Yr 2.55
2
Year 1·18
10 1.65 Year
100 Yr 2.55
2
Year 1·18
10
Year 1·65
100 Yr 2.55
2
Year 1·18
10 1.65 Year
100 Yr 2.55
2 Yr
10 Yr
100
Yr
ft
90 1.5% 3.4 0.0 3.4 4.0
90 1.5% 3.4 0.0 3.4 5.5
90 1.5% 3.4 0.0 3.4 8.6
40 1.5% 2.6 0.0 2.6 4.8
40 1.5% 2.3 0.0 2.3 7.2
40 1.5% 2.3 0.0 2.3 11.1
50 4% 1.8 0.0 1.8 5.9
50 4% 1.8 0.0 1.8 8.3
50 4% 1.8 0.0 1.8 12.8
40 4% 1.7 0.0 1.7 6.4
40 4% 1.7 0.0 1.7 8.9
40 4% 1.7 0.0 1.7 13.7
28 4% 1.4 0.0 1.4 7.1
28 4% 1.4 0.0 1.4 10.0
28 4% 1.4 0.0 1.4 15.4
70 4% 8.1 0.0 8.1 2.3
70 4% 8.1 0.0 8.1 3.2
70 4% 8.1 0.0 8.1 4.9
• *Formula: T = 1.8 * (1.1-C) * DA.S I sA.333
Gen.
Ind.
Gen.
Ind.
Gen.
Ind.
Gen.
Ind.
Gen.
Ind.
Gen.
Ind.
Gen.
Ind.
Gen.
Ind.
Gen.
Ind.
Gen.
Ind.
Gen.
Ind.
Gen.
Ind.
Gen.
Ind.
Gen.
Ind.
B 0.87 0.09 0.31
B 0.87 0.09 0.43
B 0.87 0.09 0.67
B 0.87 0.03 0.14
B 0.87 0.03 0.21
B 0.87 0.03 0.33
B 0.87 0.10 0.50
B 0.87 0.10 0.69
B 0.87 0.10 1.07
B 0.87 0.03 0.19
B 0.87 0.03 0.27
B 0.87 0.03 0.41
B 0.87 0.02 0.13
B 0.87 0.02 0.18
B 0.87 0.02 0.27
B 0.25 0.02 0.01
B 0.25 0.02 0.02
B 0.25 0.02 0.03
0.30 1.28
0.30 1.80
0.30 2.78
Page3
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Post -Construction
Basin
A1
2 Year
Storm
Event
10
Year
100
Year
Pump
Area
Basin
A2
Roof
Area
(81)
Side-
yard
(82}
Land-
scaped
Area
(83)
Totals
From Hydro
Manual Fig 3-
2 ft
1.22 1.82 67% 1.18 90
1.65 3.01 55% 1.65 90
2.55 4.5 57% 2.55 90
1.22 1.82
1.65 3.01
2.55 4.5
1.22 1.82
1.65 3.01
2.55 4.5
1.22 1.82
1.65 3.01
2.55 4.5
1.22 1.82
1.65 3.01
2.55 4.5
1.22 1.82
1.65 3.01
2.55 4.5
2 Year 1.18 40
10 Year 1.65 40
100 Yr 2.55 40
2 1.18 50
1.65 50
Yr 2.55
2
Year 1·18
10 1.65 Year
100 Yr 2.55
2 1.18 Year
10
Year 1·65
100 Yr 2.55
2 1.18 y
10
Year 1·65
100 Yr 2.55
2 Yr
10 Yr
100
Yr
50
40
40
40
28
28
28
70
70
70
%
1.5% 3.9 0.0 3.9 3.7
1.5% 3.9 0.0 3.9 5.1
1.5% 3.9 0.0 3.9 7.9
1.5% 2.6 0.0 2.6 4.8
1.5% 2.3 0.0 2.3 7.2
1.5% 2.3 0.0 2.3 11.1
4% 1.8 0.0 1.8 5.9
4% 1.8 0.0 1.8 8.3
4% 1.8 0.0 1.8 12.8
4% 1.7 0.0 1.7 6.4
4% 1.7 0.0 1.7 8.9
4% 1.7 0.0 1.7 13.7
4% 1.4 0.0 1.4 7.1
4% 1.4 0.0 1.4 10.0
4% 1.4 0.0 1.4 15.4
4% 8.1 0.0 8.1 2.3
4% 8.1 0.0 8.1 3.2
4% 8.1 0.0 8.1 4.9
Lim.
Ind.
Gen.
Ind.
Gen.
Ind .
Gen.
Ind.
Gen.
Ind.
Gen.
Ind.
Gen.
Ind.
Gen.
Ind.
Gen.
Ind.
B 0.84 0.09 0.28
B 0.84 0.09 0.39
B 0.84 0.09 0.60
B 0.87 0.03 0.14
B 0.87 0.03 0.21
B 0.87 0.03 0.33
B 0.87 0.10 0.50
B 0.87 0.10 0.69
B 0.87 0.10 1.07
B 0.87 0.03 0.19
B 0.87 0.03 0.27
B 0.87 0.03 0.41
B 0.87 0.02 0.13
B 0.87 0.02 0.18
8 0.87 0.02 0.27
8 0.25 0.02 0.01
8 0.25 0.02 0.02
8 0.25 0.02 0.03
0.30 1.24
0.30 1.75
0.30 2.71
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HYDROLOGY CONCLUSIONS:
Pre and Post Comparison
Rate
'· .. Pnt POst . :··
Ar '• ' .' <
' I .. ·:·, ''.";;· .·
Q Q Q
Basin A1 cfs cfs cfs
2 Year Storm 0.31 0.28 -0.03 Event
10 Year 0.43 0.39 -0.05
100 Year 0.67 0.60 -0.07
0.14 0.14 0
Pump Area 0.21 0.21 0
0.33 0.33 0
0.50 0.50 0
Basin A2 0.69 0.69 0
1.07 1.07 0
0.19 0.19 0
Roof Area (B1) 0.27 0.27 0
0.41 0.41 0
0.13 0.13 0
Sideyard (B2) 0.18 0.18 0
0.27 0.27 0
0.01 0.01 0
Land-scaped 0.02 0.02 0 Area (B3)
0.03 0.03 0
1.28 1.24 -0.03
Totals 1.80 1.75 -0.05
2.78 2.71 -0.07
Volume
ww;: :1~ .,. .. ~: .. ·· ..
.A .':".·;·~~-;;:~_.:_-'.'; :. <:: .. :"<
. ' £ 'Ji1} ; ·. ;< ... 'I ;, :: ,r.,. :·'f)~ .•.
·~~:" ''}t~ · .... , I c'· • .• ,. <: ·:·· ,_··:; i~ .· : CF
,'-~.-,_,.
cf cf cf
1.4 1.4 0.0 Slight reduction
2.0 2.0 0.0 due to addition of
3.1 3.1 0.0
porous pavement.
0.5 0.5 0.0
0.7 0.7 0.0 No change.
1.0 1.0 0.0
1.2 1.2 0.0
1.7 1.7 0.0 No change.
2.7 2.7 0.0
0.4 0.4 0.0
0.6 0.6 0.0 No change.
0.9 0.9 0.0
0.2 0.2 0.0
0.3 0.3 0.0 No change.
0.5 0.5 0.0
0.1 0.1 0.0
0.2 0.2 0.0 No change.
0.3 0.3 0.0
4.0 4.0 0.0 Slight reduction
5.5 5.5 0.0 due to addition of
8.5 8.5 0.0 porous pavement.
The post construction runoff from the building site will be reduced to an amount equal to or less
than the pre-construction runoff rates in accordance with the Standard Urban Storm Water
Mitigation Plan .
Page 5
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HYDRAULIC CALCULATIONS:
DETERMINE THE REQUIRED SIZES OF PIPES AND SWALES:
'"'';'oj i;' :.~itt;,?:~b.~. ,;,i;-.' ' . ~·=·:a: ' ,' ,i:'J'. '}·:f:j! , r ~/:} .. :.; > . ........ I'· """' ·,.. c:!.:! , :c Dt811L ' , I 's• ·•'
,.oi. •,];. _;~;v .i \! -~
Qcap=
ft % cfs 1.49*A *RA.667*SA.51n
Drains Area Under Capacity exceeds 1 Canopy (Pump 0.50 1.0% 0.013 0.3 0.6
Area) flow; OK.
2 Drains Vegetated 0.50 1.0% 0.013 0.4 0.6 Capacity exceeds
Swale flow; OK.
3 Drains Basin A 1 0.50 1.0% 0.013 0.6 0.6 Capacity exceeds
flow; OK.
4 Drains Cleanout I 0.50 3.0% 0.013 1.0 1.0 Capacity matches
Junction J1 flow; OK.
5 Drains Cleanout I 0.50 7.0% 0.013 1.5 1.5 Capacity exceeds
Junction J2 flow; OK.
4 Drains Cleanout I 0.67 1.0% 0.013 1.0 1.2 Optional pipe
Junction J1 configuration.
5 Drains Cleanout I 0.67 2.0% 0.013 1.5 1.7 Optional pipe
Junction J2 configuration.
0.44 0.025 0.05 0.01 0.15 0.425 1.04 6
0.44 0.025 0.10 0.01 0.19 0.357 1.23 4
Note: At the greater depths, the water will flatten the grass and will no
longer be flowing through the blades. Therefore, the "n" value will be
0.025.
STORM WATER;
For the oil-water separator, we will use a volume based calculation, using the precipitation figure
from the 85th Percentile Precipitation Isopluvial Map .
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The oil water separator requires a tank of approximate 200 gallons. We have used only a third of
the area of the pump apron, since the canopy will divert most ofthe rainfall from the apron.
For the roof drains filters, we will use a rate based calculation.
HYDRAULIC CONCLUSIONS:
The proposed improvements are large enough that the existing runoff be intercepted by the storm
drain devices described earlier in this report. We have determined that:
1. The proposed lined pipes will convey the runoff from the area under the canopy, the
interceptor at Basin AI, and the vegetated swale.
2. The proposed oil/water separator has sufficient storage to "treat" the flow from the area
under the canopy .
CERTIFICATION AND SIGNATUBE:
I hereby declare that I am the Engineer of Work for this project (DRAINAGE AND STORM-
WATER IMPROVEMENTS REPORT FoR 7-Eleven, Carlsbad Village Drive), that I have
exercised responsible charge over the design of this project as defined in Section 6703 of the Business and
Professions Code, and that the design is consistent with current standards. I understand that the check of this
project hydrology study by the City of Carlsbad is confined to a review only and does not relieve me, as
Engineer of Work, of my responsibilities for project design.
Bruce A. Tait
R.C.E. 32247
Exp. 12/31/10
• • 1. ~ ·.-'; ·;. f'
Page7
• EXHIBITS
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Page 1
• DRAINAGE BASIN 1
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• Page2
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LEGEND
======== liD-PO-----IlD--PO---·------' ----...
--.. _, -liD --• . --~I
; ---· _ _,
\\ ~
Ollila. ,
050
2 Oratns Vegetated SW..Ie 0.50
3 Drains Basin A 1 050
4 Dra~ns Cleanout I Junction J 1 050
5 Dratns CleanOut I JunctJon J2 050
.. Drams Cleanout I Juncton J 1 0 67
5 Dra~ns Cleanout I JunctJon J2 067
EXHIBIT 1
-----~ __ ...... _ _,
----·
(1l. (i 4/CI{
%
10%
10%
10%
30%
70%
10% (} PTICJJ4 L.
20%
---·
___ ..., --------------__ _.. ---
-------
\ f'
f'
PROPOSED SITE PLAN
---.,._..,.... _ ------. -----~------....
"-
:1: ~ ..... .. ..... ::-z . c.
7
'-' ... ,
[]
I'K:"'\,~-. I
u,;, .. \ .. : I
Page3
• SOILS HYDROLOGIC GROUP MAP AND SOILS INFORMATION 2
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Page4
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l..JSO.\ United SIMes
.. Deper1rnent of
Agnc:ultn
~ NRCS
A product of lhe NatioM1
eoop..~rve ~Survey,
I JOin! etrort of lhe United
States Department of
Agritullure end OCher
Fedet'lt llg8l'tdel. Stele
agenc:iet including lhe
Agncullunll Expenment
Stations. llt1d local
pal'bc:lpants
Custom Soil Resource
Report for
San Diego County
Area, California
Oc1ober 13 2010
Preface
SOIIIUMtyS oont.u'llntonnaclon lhlit affeds '-nd UM planning lf1 survey etNS They
highlight 1011 fmlllbonl th.t 8ffec:t VMDUS IMd UMS end pnMde intDrmalon about
the ~ of 1he lOIII in IN survey .,..., SOli surveys are designed for many
different Ulef$, indudlng r.rm.r.. rw~Chers. lofntln. ~anlsta. urt.n plannera.
COIYW'llUnlty offtcu. eng&neers. developef$, builders, end home buyeR. Aile.
c:onMfVIItionilla. 1Nc:h4n. ltudents. lind speclliltl In rec:rMCiOI ~ ..... dtapOUI.
end polulion c:onii'OI can use IN surwyaiD help !hem~. ptOIIId. or ent.n<:e
the enwonment
venous lllnd use regiAtionl ot Federal, s..... lind toe.~ pemmentBINI'f lmPOM
spec3l rntnctlonl on IMd use or land b'Nimlnt Sail surwys identify 101 properties
th.t are used In meking v.nous l8nd use or lend trntment decisions The lntonnabon
Is tntended ID help 1M land Ulef'S ldel\bfy and redual the effects of SOillimbbons on
,...,.,. lllnd .-. The IWldownef or UMt .. ~ Jor Identifying llt1d complying
with elCIIWig '-a end rwgulnona.
Although lOll survey lf'lfl:lnnaon c:.n be uMd tor general r.m. loca. llt1d Wider .,..
plannlf'lg. OMIIe lnveatlpllon is needed to supplement ttllllnlormabon In .orne cases
EDmpiM lnCllde 1011 ~ ..-..menta (hnp llsools usda govltqal) lind c:ef1*n
COI\MfVetion end enoinelrtnO ~· For mont ctet.ild Information. contact
yoot locall USDA S.W:. Center (h~ llotftces sc egov usda 90'Jiloca10r:app?
agel"cysnrcs) or your NRCS SUIIII Soil Saenlllt (http llsotls usda govtCO<'It«tl
ostatf' _ olf>cesi}
Great dlffwencel m 1011 propel'bel can oceut 'Mitlttt shot1 dlstancn Some soils are
~ wet or suqect to flooding. Some are loO unstable to be UMd • a
foundation for bindings or roads. caay.y or wet lOlls are poorly suited to use as MPiit
tank ~fields. A high..._ table makes a soil poof1y suited 1.0 bas1ments or
undergrOund instalationS.
The National CooperaliYe SOli Survey as a jOint ef'lol1 or the United States Oepllru'nef It
of AQricullure end other Federa agencies. S.. egencJn Including the Agncullln
E)CJ~em!ent Stallons. end locall agenc:IH. The tu11n1 Rncurces Conservltbon
SeMce (NRCS) haa lellderlhtp tor the Fedeql part of lhe fQbonel CooperaiMt SOli
Survey.
lnfotmaeion about IOila 11 updated penodlcally Updated mformabon II avautlle
through the NRCS SOli Daa Mart Web Site or the NRCS INeb SOli Survey The Sotl
DaUI Mart 11 the data stor8Qe site for the ol'liclaiiOIIsurvey lnformabon
The U S Depattment of Agncullure (USDA) prohibits diSCf1n'Wiallan 1r1al1t1 programs
and 8CIMIIes on the basil of race. c:dor. nalioNII origin. •· disabdlty. and where
~.sex. marMI status famllal scatus, parental status. religion. uxual
onentaaon genebc lf'ltorm.bon. political befiefl. ,.U. Of because IJII or • pwt of an
ltldMduafstncorr. 11 denved from any public aswtance program !Not a1 prollibiled
baus iipply to .. prog~ ) PeriOM WJth d ..... who require altematlYe means
2
PageS
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for commullic*ion of Pf0111W11 informMion (Braile, l8rge prln~ ~.Me.) lho!Jid
conta:t USDA's TARGET Cenelr .C (202) 720-2e00 (voice llf1d TOO~ To ftle •
~of cfilclirnlnltia, wriee 10 USDA. Dndor, Ofb of CMI Right~. 1400
lndependenceAwmte, S.W., ~.D.C. 20250-9410 orc.l (800) 785-32n
(voice) or (202) no.aa2 (TOO). USDA • en equ8l o~ provide~ and
~-
3
Contents
PnlfKe ... ' ................................................................................................................ 2
How loll~• Ate llldlt ................................................................................. 5
Solllep. ................................................................................................................. 7
Sollu.p ................................................................................................................ 8
Legend .................................................................................................................. 9
...., Unit legend ............................................................................................... 10
Mllp Unit Detcriptiona ............... '. ' ................................... ' .................................. 10
88ft Diego County Ma. C8ll1bmla. ................................................................ 12
~ -..ny coane und, 2 to 9 P8f'C*1t slopes ............................. 12 ,_........c ............................................................................................................ 13
Page6
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How Soil Surveys Are Made
SoiiiUIVe'fl .. made to provide ilifonnatioll about .. lOIII and rNicelalleOUI ....
in alpeclllc .... They lndude 1 delalptloi• of lhe lola and mllcalalleOUa.,... and
1halr location on ltie *ldaclpe and lilbla lhlllliow a propJI1ieJ and fimitlllions
affecting ¥lrioul UIM. SOilldanlilts ot.JMd lhe ........ llngll. and shlpe of
tM ~~opes; 11e.......,.. panem ~ ch!Mge: 11e kinds of era,. and n~~~ve p~am~; a
1M ldndl of bedrock. T'her obMrved and dMc:ftbed nwwy 101 ...... A 101 prollla II
lie sequanc:e of ftltlnllayen. or lionzanl. In a eo1. 1M pro4le .-nc11 tam 1t1e
...... down Into lhe UIICOI iiOid-.cl l'ftlitiiNI in wtlich 1M aolllclnried or from the
...-.:.down ID bJdroc:l. The UIICOI~ mMirill Ia devoid of rueD and olw
HYing orgenilmllnd hal not been CNnged bf OCher biologlallldlltlly.
CUINIIIV. lOIII .,. ft'IIIPfl8d ICICOfdlllll lo ... bOUndlrile of major land rJIIOUfce ....
(Ml.RAs). MLRAsare ~~~~lind reeource unila that share common dilnlcllliltlcs relaeJd 1o phpiograptiy. geolog'f. cllmaee,...., reJOUR:el.
.... biologk;8l nMIOUICel. and land UleJ (USDA, 2001). Soii~UMy .... tvPk*IY
consill of parts of 0111 or more MI.AA.
The 1011 and miecalllleOUI .... In 1 surwy aree occur In an orderty pall8m that IS
rel8lld to 1M geology.llndtomia, relaf, c:lrnlll, and nabnl v.glltMiaft of the ......
E.adl kind of 101 and miecJIJneauJ ... laauc ·a a ~..., • pertiCular ldnd of
landform or 'Willi • ugment of lhellndfamt By obNrvlng the Mlh and msc:.llneoul
.,...In lhe NWY ... lind l'ltJiing lttJir poeltion to SpiiiCIIIc sagmanls of 1M
t.ndbm. a .oiiCilntist d8olftlps acancapt. or model of how ttley...,. tom.c1. Thus.
during fNIAiing. INs model ......... .,. ......... to pi'JCICt with. CCII'IIIdttltle
degrM or IIOCUf'lley the kind of 101 or milcJIJIMIOUI.,.. 11 a spacHic 1oc111or1 on lha
land!IC:8P4t.
Commonly. indMduJIIOIII on 118landllcape nwge Into OliJ anoiiW a lttJir
c:hlrldlfislcl gnldualy change. To construct tn IICCUf'MIIIOI mep, tiowrlel, IOil
lcielltilll must determine lh8 bour*tM ~the 10111. They can obMM ontt
lll'rlltN number of sol prolle&. Nlv8rfilllll ...... ~-. supplamlntlld by
an undel*'lclii!V of the soil \ lglt:llal...._ldlcapa ralaliOI illiip, .. IUIIclent ID wrlfy
pNdk:tion8 of.,. kinds of soil In '" ... -to dMirrninatha boundJriel.
Solldantiltii'JClOfded lh8 ~of 1181011 pdleJ that they studied. They
ldld 101 color. tlldUre. liB and....,. of ............. ldnd and llllOUfll of rock
hgmalita. diltribulion of plant rocD. .-dlon. and oOier .....,_!hilt enable them 1D
identify 1011. After detc:l'lbillf lie lOIII In thaiUMIV .... and clellmilfiiriO "*'
plopeftiea. lhesoilldlntills aaigned thaiOiiiiD taxonomic ciJaa (units).
Tuonomlc c:llaes .. COf'IOipla. Each laxanomlc claA till I Mt of 1011
~will ptec:ilely dltNd llmila. The dJu8l .... Ul8d ... bMil fat
COf'l1)lrilon lo classify ... ~. Sol taxonomy, lie lyltlm of lllxonOmie
c:IJAiftcallon used In die Uflllld Stills, Ia baed mainly on th8 kind llld c:1w1etar of
soil propartlel and lhe ~of liorlzorll Yrithin .,. pdlle. N'er lie soil
ldanllatl daaUiad and narnad the lOIII In IN SUtWy ..-. they compared the
5
individual toils wifllimilar toils in lhe ume lalaonomic: c1a1s in 00. ....a 10 that
they could confwm data and auemble llddltloNII datil baed on experience and
,....-ch,
The objective of toil nwppJng is not to delinNie purw 1n1p un11 compo~•a; the
otljeclve lito ...,..the~ intO llndbml or llndlonn •grnents lNit hllve
liml8r use and ~ requhments. &chIMP unit II cllltined bf a unique
combintltion of IOil c:crnpouents Wldlor ~leOUI ..... in ~
pl'OPOI'Ijofts. Some compo~leftl:a 1N1Y be~ conRIIIng to IN olhet ~of
llle IMP unit The pntHnce of minor compolleiDin 1 11111P unit In no w.t dlrninllhel
IN ~or ea:utaey of 11e data. The MINIOn or such t.lllfonM 8lld
landbm Mgl'l1ents on the IMP PRMdft IUflcilnt infDnNtian tor._ development of
rnouros .,._. If lntlntM u.. of srna~ .... Ia ~. ont* lnveetigallon is
nHded to dlftne .nd ~ !he lOIII and rnilc:elllneoua .....
Soillciel•liltl ,.,.. rNnY field obMI....eiontl in .,. P'OCIISa of producing • a ITIIIP·
The hquency of OblleiWIIGn Is depelldeftt upon..,.,.. fllclorl. ~ ~ of
~. iniiMilV of mepp~ng, dellgn or map units. QOmPieldly of lhelandlc8pe. and
........ of the IOIIIdentill Oblelwat~ona.,. made to tilt n Nine lhe _.
-..ac.p. moct.1 and pnldicaol,. and to verify ltie claulficlllion of lie loll at specific
locJiona. Once the soil '-ndlcape mocMIII ..en.d, a l9lilcll~ IINIIIr number of
~of incflviduJIIOII papet1ielant made and~. TheM
lnUIUI'erMftta mJf Include laid ~ IIUdl •!hoM tor calor, deplti 10
~lind tnt~n. and laborlb'! ~. IUdi .. thoM for content of
land. .a. e~ay, lilt. and ott~er compo~~e~IIS. Properties or each 1011 typically v.,., flom
one point to enoliJr acrosa the •ldaelpe.
ObeltvatlaiiS tor IMP unit compolienla .,. JIIG"IPiild to develop rangM of
~· for the compol,.,. The aggregated v.~ue~ .. ~·t.ct. Direct ,......,..... do not alit lor..,.,., property .....,..lor .-y map unit
compon.,.l VlluM for_,..,. p01*11ft .. .....,.._from ClOiiiblllllion• of other
pi opertiel.
w.. 101 surwy .. in progrea, ..,.,... of tome of ltie IOil in lie ..... generally
.,. colldld lorlalboriiDiy INII'/IM and tor englnMrtng ...... Sal~~
lie dJia from ltieM....,...-............ .,. field..obMrWd chanlctltiltics
lftd 1M 10M proplfiiM 1D deeal11ilne ltie ~ betllvlor of IN soils undtr dlfreNnt
u .... ~~~-for .. of lhe ...... filld tilled ltwugh obMfVIIIan ofh ...
in dlflltwll 111M and under diiJNnt ..... of managerMfit Some lntllpretiiiOIIS.,.
modlled ID lit local candltiolll, .nd _.,.new~-~· .. dftalc!*l to meat
lOcal need~. Oeta .. aaumDied from 01t1er IOLW'CI&. IIUdl u .....ard'i infonnalon,
produdlon IKIOI'Its. and filld ape~ iel~e~ of spec 'llata. For...,.,.,.., datil on crop
,.... under dJined--of management .. II II mbled from farm IWCOida and 11om
fteld or plat~ on lhe IIINidndl of d
~ .. lbollt 1011 behavior.,. baed not only on 1101 pvpel1iJs but -'to on such
.............. and bialaglclllctMt'f. Sail condlllons .. predk:IM)Ie CMf long
pefiodl of time. but ttley .. not predidJbiJ from year to v-. For ...,_., soil
IICienliltl cen .,..c~et wllh • fMiy high deGrM of eccuraev ltllla QMrl soil wdt hllve
I high Wlllilt tlble wiltlin C*tain ~ In molt years, bul they cannot predict 1t1Jt I
high WltJr tlble _. Jlweya be at a specific ~ In the 101 on a tpJCitlc date.
AftaiiOIIIC:Iel•tlltllocaled and Identified the slgnjlleant NIUII ~ of tOll In lhe
sur;ey ....., 1t1ey c1rw the boundMa or theM bodies on .na1 pholographlanct
Identified Hd\•a ~.....,unit. Aerie~~ lhowtrell, ~ tielda,
roads. and rivers, II of wtricti help In locating boundarlesaccutatllly-
e
Page?
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Soil Map
The tolrnap Sldian Includes 1M IOilmep for 1he o.nned .,.. of in4erftt. .... of loll
map unb on 1M map and eldllnt of uch mep untt. lind eartagrapNe symbols
dilplayecl on 1he mep. Alto prnented .,. various met.data Mout data uted to
produce 1M rnap. and a dMcrtplon of Md\10111 map Ufllt.
7
l
I• ;~:I
I (,)
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Page 8
•
•
•
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:1
J
I
1 ~ a • • x .. o < .. ~ • • > .. :-: • o .c. ... Q
Custom Soil Resource RtpOft
Map Unit Legend
-LINt--o.:s
Map Unit Descriptions
The miiP una dlllinullld on 1t1e cMtlliled 101..,.1n aiOilsurwy represent 1M 1011a
or rNiceilalleOUI.,._ In the turwy aru. The mep unit det~Criptiona.lllong wiltl the
.,..,.. c:.n be used to datarri~e IN~ end propel1iM cia llllk.
A rNP unit delinftCion on • toll miiP ........-_, .. ~by one or men
I'Mjor kinds old or~...._ A map unllaldentilled .net natlled
accordltiQI to IN te~oiOrlllc ciiiM'btion of IN clclf11Mnt lOla. 'Mhin • •onomic
dela ..... prec.tM!y daftned llmiS for the ,.....of the sols.. On the~.
l"'oWeWt, IN 10111 .. .,.,... pheiiOI'IIIN. and theV I-. IN c:ha**"il4ie ~
of .. .,.,. pMtiOINII&. Thus. 1he,... of.,.,.~ propeniaa..., edlnd
~the.,....,.. for. teonornlc ct.M. .-....of lOIII of ...... tllloiOITiic daM,...... If ....... '*' be ll'l8plled wiltiOUI indudlng .... of othet tuonomic
claiM&. Conuquently,.,.,., miiP unlll mede up of tiM! lOla Of~*"'
for which it is rwned and lOme ninor compo~Miflti!Ml belong to taxonomic: cas..
odlar IMnltloM ollteiMjof ....
Matt minor 11011 twve ~ litllil.-to ltloM of 1M domina~ It 1011 or 11011 In the
map unit. and ltlu. hly do not a«.ct Ule and menegemenl n. .........
noncontr•lng. or limillr, componenla. They !NY or !NY not be rnenlloned In •
p8ftlculer map unl ~-00. ninor components, ~. hiMI pniPel1iel
and behavionll c:hllr.a.iltica ciMrgent enough 110 .rr.ct.,.. or to ,.quire clll'eNnt
~ Theee .. ~COIIII .... IQJ.orclllin .. ,campoc ... a.. Thergeneqlly
.. In ..,.. .... and could not be lftlllllled ...,.,... ..... of ..... used.
Some tmll ... of llrOI9f COIIhatint 1011 or milellal~eGUS .,.. .. idlf'lliled
~ alpecill ayiNxll on IN rNpL llrOided In IN «<M..,... for • given--. 1M
COI1tr81ti1QJ "*'« compolleilta .. ldentilild In 1he lftiiP unit daclip&ioiiSIIIong witt!
101M cMiadlriltlc:a of eadl. A few .... of minor~ mey not lwve beln
oblelwd. end ~they .. not mential~ in IN dMc:rlplons . ..,.a..IV
wtlelethe pablm wato~ INt t wasimpl'adlclll to,.. enough obeellllltionl
110 IdentitY II lhe lOb lnd rrQcellaneous .... on the .,ldtlcllpe.
The preMn<le of I1WIOf c:omponetlts In a !Nip uniC in now., diminishes IN .,..,.._.
or accur.cy of lhe diD. The objec:ttlle of mapping is not 110 dellneMa P'ft lbOIIOmic:
c:1aeee but r.therto...,....lhe ~ lniD landformaor IMdform Hg~Nnlsltlat
have llmiW uu and ,....,_d rwqulrementl. The delluealon of such....,..,.
on 1he !NIP prcMdn IUftlcient Information for the dellelopnent of rwtourc:e s*M-If
lnten$lve UIMt of smell ...... r;Unned. howevet, Ol'llilla lrwestlg.uon Is needed to
define and loc:afe the toils and ll'lisalhneoul .....
10
100.~
Page9
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An Identifying 1ymbol ptfiCiedet 1M map una name 111 the I'Np una dnalpllona. Eadl
detcriptlon inc:ludn gen«a1 fads 8bout 1M unit n gWes ~toil properties
-~· Soilllhat l'l~~~~e ptofilea that .,.llmoet like ,.._ up a M1ll nnu El!CIIIt for
differetiCH In texture of the IUffac:e ..-. II.,. toils of a ..nes twve INijor horizons
1t1at are almlllr In COtnpOIItlcft, thiclcnea. and--~
Sola of one_.. can dlfter 1n1amn of lhe surfKelllyer.llope. aeon~nea, .....,lly.
degree of .roa~on, Md other c::Mnderiltica IMit afllct their use. On lhe bnis of IUdl
diffeiMCM. a 1011 ..,._ • dMded "*' MJil ,.,.._ Molt of lhe ... lhcMn on lhe
deWillld soil "'IIPP .. phaes of IOil..,.., The .,... of a sol P.• comma~ I\'
~a fNUe ttl8t 6da 11M Ott ,.,.,agMWnl FOt ..... Alplw tilllotm. 0
to 2 percent slopes, il • phase of the .......
Some IMP...-.. made up of two or men n1ljor toils or~.,...,
These map un11a are carnplexn, ~ ... or utldlff4QU!ieelld group~.
A complex conaista of two Ott more loll Ott ,_...._,.... .... in IUdl M ~
paCfilm or in tud'lllmllll .,....that lhtr cennot be shown...,...., on lhe ,..,._The
paCfi1m and propon1on of lhe 1011 ot miacelaMoul .... are~ atm11at In al
...... ,A~pN-Be~a e«nPex. o 1o e percent slopes. " ~m uamp~e.
An auociaaon It made up of two Ott more geogriiPIIIcafty 8IIOdalld IGila Ott
millcaiiiiiiOUS .,... lhet are lhcMn • one unit on tile mapa. a.c.uae of preaant Of
~ U1M of lhe m8p unlla in lhe 1Ur<1eY area, It_.. notCOIIIidaled ~
or .-....y 1o map the lOll or rnilc:lallllnao.,... ~· The pMtam and
rat.~tw PfqMirllon of lhe toils Of miiCIIaiMIOUI .... are IOI'I'I8Wtlal similar. Alpha-sac. anociatlon, 0 lo 2 parcent llopaa, • M uample.
An ~IWNfiiOUP Is macle upoftwoormoreiOI,. orn~ .,...ltult
~ be mapped lndMdudy but ... JNppad • one unit because limilw
~ .. can be made far use and~ The prlltM\ and proportion of
the 101'-Ott milellll..ou..,... in • JNppad ... are not uniform. All ... can be
mac1e up of only one of the nw;or lOIII or mlleellalleOUa .,..., or It can be made up
of II of them. Alpha and Beta IOitl, 0 lo 2 pert:ent slopes, Is en eampte.
Some~ Include~.,._ &.ldt .,.. ,_..,.,.or no 1011 material
and support little or no vegetation. Rack aw:rop • en eufT1)11.
11
Cuatom Soi Resource Report
San Diego County Area, California
MIC-Mariuloamy coane unci, 2 to I percent slopee
..... Unil Seeling
AfNn 111111Ual eir tempenatrn. S7 10 61 degree& F
Map Uftll COftlllodlon
Aferina end limltlr aolla: 85 percent
Alnor~ 15 percent
O.Crlptlon of Mllfna
Setllng
I.Midlorm: Ridgea
DowrHiop4t .,..,. .. linelt
ActoiHiope ...... Unur
Patwtt maiMal: Eolien unc:ta derived from mixed ~
PropMies and ........
Slope: 2 lo 9 percent
Oeplh to 1N1rictM IHtura: More than 80 IncheS
~ca. Somewhat~ dr.ined
c.pecly oltM '**~layer to lnlttamlt...,., (Ka): ~high to high
(0.57 lo 1.91 inltw)
Depfh 10 watw ,... Men than ao Inches
FtWqUent:y d loocfnQ; None
F~WqW~~Cy al pottding: None
AlaxMrlum ~ Ncnllue (0.0 ID 2.0 mmtiOI/cm)
A~_...,. ctpeC~ty. Modclrate (about e. 1 Inches) ............ \le.....,.
Llflld~~ (ifrlgatedJ: 3a
Llflld C#lpllbllily (fJOrtlllijjwlfld}.· 4e
Typical ptGflle
0 to fO lnc:hN: L.ollmy c:oerM und
10 10 571ttt:Ma: ~ und, loM1y coarM aand
57 ro eo ittctNM: Sand. c:o.ne und
•norcomponen•
C..w..cf
Pwcent of map unit: 5 percent
ChMtlettoft
Pan:ent of map unit.· 5 petQent
c~
PfNCfltlt ol map unit 5 percent
12
Page 10
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References
Amerlc:anAuoc:18ClonofSa.!e Highway and Tran~Oftlc:lals(MSHT0)2004.
s~ lpedftc;abona for~~ end methodl of sampling end
testing 24th editiOn
Amenc:an Society for Testing and MMir'lllll (ASTM). 2005. StancMrd daSif'lc:allon of
sods for engmMMg purposes. ASTM Standard 02487..00.
Cowatdin. LM .. V Cartel'. F.C. Gc*tt. and E.T. LaRoe 1979. CIHslblion of
wetlendl and deep-water h.t)Qts of lhe United Statft. U S Filh and Wllclltll ServU
FWSIOBS. 79131
F edeflll Regmer. July 13. 1994 CMngel n nydnc 10411 of lhe Unlled SIMa
Federal R~g~~ter Septembet 18, 2002 Hydnc lOlls of the United Slate$
Hurt G W .. and LM. V..Ua. editors Version e. 0. 2008. Field Indicators of hydnc IOila
"" the United Stetn.
National RIMIUtdl C()UftCd 11195. We4tandl Ch8111det iStic:s and bolmdariea
SOli Survey Dlllillon Staff 1~3 SOIIIUIVey manual. SOtl ConNMibon Sttnnce. U.S .
Department of Agriculture Handbook 18. Ntp llso1ls u5da go"'
SOli Survey Staff 1999. SOli tuonomy A baSIC system of 1011 dalllftcation for ma1t1ng
end intef'pre1lng IOilaurveya 2nd edlbon. Nat\11'111 Resources ConservatiOn ServiCe.
U S Department of Agnculture H.ndboc* 436. ll!tp ii!IO•IS .JSda fi0\11
SOli Survey Staff. 2006. Keys to 1011 tuonomy 10th edlbon. U.S OepMrnent of
Agriculture Naful'lll Reloutcet ConMfvlllion SerYice hrtp !ISOifs usda !}OVI
Tmet. R.W Jr. 1985 Wetlands of Delaware U.S. F11h and WldWe Service and
Oeteware Department of Natural Retaurces n Enwonmenml Control. Wlltlandl
Secbon.
United States fvm!; Corps of Engtneeta. Envarorunentallatloratoty. 1987 Corps of
Engmeers wetlands deWieabon m811U81 waterways Experiment Station Tec:hnal
Repct1 Y-87-1
UNted Sta&et Department of A41ncullure. N•tural Reeources ContervatJOn SeMc:e
Nabonal forestry manual rnp ·rso•is .. ~a qc•:
United Stalel Depal1menl of ~ICUIIure. NOI.-.1 Resources ConservatiOn SeMce
Naboniiii'Jin9e and paature handbook llttp "www glt• nrcs uwa govr
United States OepaJtrnent of Agriculture. ~ Resources Conaerv.oon ServiCe
NatiOnal lOll survey hiandbook. lllle 430-VI 'lllp "SO< IS usda gov1
United States ~nl of At.~riCUiture. NR.Iral Resoute:ea Conurvabon Serv1Ce
2006 l.and resource regG~S and ~pr '-lid resource •re• of the United S1JMel the
Cattbbean. and the Paoflc Basin U S Department of AQrlcuJture Handbook 29&.
http 'ISO•lt \I!Odil 90~1
13
Custom Soil Resource Report
Un1ted States Department of Agnculture. Soli Conservation ServiCe. 1961 Land
c.pability classification U.S Department of Agnculture Handbook 210.
14
Page 11
• "'t;j ~ -N !Mil Dqo Counsy H)lhlqy M.nual Dale: June 2003 Table 3-l • Section: l'ap; RUNOFF COEFFICIENTS FOR URBAN ARIAS Lind Usc NRCS Elaacntt UndiiCUitled Nabnl Ternia (NIIbnl) Low Densily RaideDtial (LOR) L~ Density Raidential (LOR) Lo~~r Damity Raidatial (LDR) Mcdiam Dalsiay Residential (MDR) Medium Density R.nideMial (),(DR) Mollium Dallit) Raidaltial (MOll) Medium Deady Raidenlial (MDR) HIP DcNit)' ~ (HOR) Hiah DeDsily ltcsidcnl.ill (HOR) Commen:iaJJlncblrill (N. Cam) COIIUIMfCiaii1!Miustrill (G. Com) Commcn:iall1adus1rial (O.P. COlD) C~(Umdcdl.) COWICY~ ...__.Opens.-. Ralclltatial, 1.0 DU!A Of 1m Residlnlill. 2.0 DU/A or less ResiclenliiJ. 2.9 DUIA or leu Rcsldenlill. 4.3 DUIA or less Rc:sidcnaial. 7 .l DUI A cw leN llosidca&ieJ. I 0. 9 DUI A or leu a.idenlial. 14.S DUIA or len Residenlill, 24.0 DUIA or leu Residrn&ial. 4).0 DlJIA or las Neilhborhood Commcrtlal Genaral Commcn:ial Office ProfcuionaltCoDimcial %1MPER. ~ 10 lO 2S 38 <fO 4S 50 65 10 10 15 90 A 020 0.27 0.34 0.31 0.41 0.41 0.52 0.55 0.66 0.76 0.76 0.10 0,1] Runoff Coeffieicnl "C" Sl)iiTm; 8 0.~ 0..32 O.ll 0.41 0.45 O.SI 0.54 O.SI 0.67 o.n o.n 0.10 0.14 0.14 c 0.30 0..36 0.42 us 0.<41 0.5<4 0., 0.60 0.69 0.?1 0.71 0.11 0.14 0.14 3 6of26 D O.JS 0.41 0.46 0.49 0.52 O.S7 0.60 0.63 0.11 0.79 0.79 U2 O.IS O.IS Limited lnduM&I I 90 0.13 GcncrallftUtri&l 95 0.17 0.17 0.17 0.17 •The va1ua -illcd W1lh 0% impervious may be uud l'of direct calculllion of the runoff cocfticicnl11 dacrilled in Section 3.1 .2 (rcpraenlina 1M pervious nmolf coefficient, Cp. far the ~aillype). or for ams 1111& will remain undisturbed in papauily. Justificalion IIIUtlllc liven lhlllhc ..-ca wiD remain IIIIUI'II forever (e.a, the-is loclllcd in Clnet.Dd Nllionll fGRSt). DUJ A • dwclliq units per KIC NRCS -Nllional Resources Conscn-•ion Service 34 • :;d ~ :z 0 ~ ~ ~ 0 ~ ~ ~ ~ ~ ~ ~ :z 1-3 ~ ~ 0 :;d ~ ~ ~ > ~ c.u ----------------------------------------------------------------------------------------------------------------------------------------------------
,
,
INITIAL TIME OF CONCENTRATION
(Table 3-2 and Fig. 3-3) 4
Ill
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Page 13
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County of San Diego
Hydrology Manual
Rainfalllsopluvials
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Hydrology Manual
Rainfa/1/sop/uvials
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County of San Diego
Hydrology Manual
Rainfalllsopluvials
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Page4
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Hydrology Manual
Rainfal/lsopluvials
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Page 5
•
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32"30'
County of San Diego
Hydrology Manual
Rainfa/1/sop/uvials
100 Y~Ra~~ ~veat • 6 R~~
llapluvilll (lncNs) 1
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County of San Diego
Hydrology Manual
Rainfalllsopluvials
DPW
•GIS
Page?
•
85TH PERCENTILE PRECIPITATION ISOPLUVIAL MAP
•
• Page 1
•
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INTENSITY-DURATION DESIGN CHART TEMPLATE
EQUATION
I • 7.44 Ps o-0.645
I • lnlltnsily (inlhr)
Ps • 8-Hour PnM:ipllatlon (
D "' Outation (min)
11111111
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............. DI"l:
(1) From pNCipitllon mapa dlelmlil~e 6 hr and 24 hr emcua
for the llllldld hquency. n-rNpe .. Included In the
Counly ~ ...... (10, 50. and 100 yrrnepa lnclldect
in the Design and Procedunl M.nual}.
(2) Adjullt 8 hr precipiCIIIIau (If neceuary) 10 IMt It iS wlll'lin
the IW9 o/45" to 85% ollhe 24 hr predpitllton (noc
app1cap1e ao DeMrt).
(3) PloC 8 hr pllldpitatiou on lhe righllide d the c:Nrt.
(4) en.. elne hough the point parallel ao.,. plo6ed ..._
(5) Thilline Ia the~ CUMt for lhe locldion
being ..tyzec:l. ...,, ..... ,...
(•) Salacad frequency __ year
(b) p8 • __ in., p24 • __ .~ • __ "121
24
(c) Adjust8d P612J • __ ln.
(d) 'x • --min.
(e) I • __ lnAw.
Noell: Thil Chlrt f11P18ceslhe lntenlly-Dintion-Frequeney
QJMtS UMd Iince 1985.
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5
Page 14
ISOPLUVIAL MAPS 6
•
•
• Page 1