HomeMy WebLinkAboutSDP 05-04; DKN Hotel; Site Development Plan (SDP) (3)-• -• -•
• -• ---------• -• -----------• --
PRELIMINARY
HYDROLOGY REPORT
FOR
DKN HOTELS
540 GOLAN CIRCLE DRIVE
SUITE 214
SANTA ANA, CA 92705
PROJECT
SPRINGHILL SUITES
RP 05-03/DEV 05-19/ZC 05-02/GPA 05-05/LCPA
05-02/SDP 05-04/EIA 05--02
PREPARED BY:
Aquaterra Engineering Inc.
1843 Campesino Place
Oceanside, CA 92054
tele: 760-439-2802
fax: 760-439-2866
October10, 2005
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..
•
• -• -•
Hydrology & Hydraulics Report
City of Carlsbad
This Hydraulics and Hydrology Report was prepared using the following
Manuals:
• Hydrology Manual, June 2003, County of San Diego
• Drainage of Highway Pavements, U.S. Dept. of Transportation -
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-------• -----• -•
--•
The Rational Method was used to determine the 100 yr. storm Q values.
The Rational Method uses the following formula to establish the flow:
where,
Q=CIA
Q = the peak runoff in cubic feet per second
C = Runoff coefficient representing the ratio of runoff to
rainfall
I = time average intensity in inches per hour
A =-Area of the subbasin in acres
.. --•
• HYDROLOGY REPORT -• -• ---------------------• -• -• -•
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County of San Diego
Hydrology Manual
Rainfalllsopluvials
IOU Year lblnfall Event-6 Hours
lsopluvlal (Inches)
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Hydrology Manual
Rainfall Isopluvials
100 Year Rainfall Event-24 Hours
lt10pluvlal {Inches)
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San Diego County Hydrology Manual
· Date: June 2003
Section:
Page:
3
12 of26
Note that the Initial Time of Concentration should be reflective of the general land-use at the
upstream end of a drainage basin. A single lot with an area of two or less acres does not have
a significant effect wltere the drainage basin area is 20 to 600 acres .
Table 3-2 provides limits of the length (Maximum Length (LM)) of sheet flow to be used in
hydrology studies. Initial Ti values based on average C values for the Land Use Element are
also included. These values can be used in planning and design applications as described
below. Exceptions may be approved by the ''Regulating Agency'' when submitted with a ..
detailed study.
MAXIMUM OVERLAND FLOW LENGTH (LM)
& INITIAL TIME OF CONCENTRATION (Ttl
Element* DU/ .5% 1% 2% 3% 5% 10%
Acre LM Ti LM Ti 4t Ti LM Ti LM Ti LM Ti
Natural 50 13.2 70 12.5 85 10.9 100 10.3 100 8.7 100 6.9
LDR 1 50 12.2 70 11.5 85 10.0 100 9.5 100 8.0 100 6.4
LDR 2 50 11.3 70 10.5 85 9.2 100 8.8 100 7.4 100 5.8
LDR 2.9 50 10.7 70 10.0 . 85 8.8 95 8.1 100 7.0 100 5.6
MDR 4.3 50 10.2 70 9.6 80 8.1 95 7.8 100 6.7 100 5.3
MDR 7.3 50 9.2 65 8.4 80 7.4 95 7.0 100 6.0 100 4.8
MDR 10.9 50 8.7 65 7.9 80 6.9 90 6.4 100 5.7 100 4.5
MDR 14.5 50 8.2 65 7.4 80 6.5 90 6.0 100 5.4 100 4.3
HDR 24 50 6.7 65 6.1 75 5.1 90 4.9 95 4.3 100 3.5
HDR 43 50 5.3 65 4.7 75 4.0 85 3.8 95 3.4 100 2.7
N.Com 50 5.3 60 4.5 75 4.0 85 3.8 95 3.4 100 2.7
G. Com I 50 4.7 60 4.1 75 3.6 85 3.4 90 2.9 100 2.4
O.PJCom 50 4.2 60 3.7 70 3.1 80 2.9 90 2.6 100 2.2
Limited I. 50 4.2 60 3.7 70 3.1 80 2.9 90 2.6 100 2.2
;
General I. 50 3.7 60 3.2 70 2.7 80 2.6 90 2.3 100 1.9
~"*See Table 3-1 for more detailed description .
3-12
San Diego County Hydrology Manual
Date: June 2003
Table3-l
Section:
Page:
RUNOFF COEFFICIENTS FOR URBAN AREAS
Land Use Runoff Coefficient "C"
Soil Trpe
. NRCS Elements Coun Elements %IMPER A B
Undisturbed Natural Terrain (Natural) Pennanent Open Space 0* 0.20 0.25
Low Density Residential {LDR) Residential, 1.0 DU/A or less 10 0.27 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 DUIA orless 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 DU/A or less 65 0.66 0.67
High Density Residential (HDR) Residential, 43.0 DU/A or less 80 0.76 0.77
-~~~~~/l~ustrial1I!-_ c~~---~ Neighborhood Commercial 80 0.76 0.77
CommerciaVIndustrial (G. Com) General Commercial 85 0.80 0.80
Commercialllndustrial (O.P. Com) Office Professional/Commercial 90 0.83 0.84
Commercial/Industrial (Limited I.) Limited Industrial 90 0.83 0.84
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.+8
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
*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 wiU 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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t}
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0
~
0
SOIL SURVEY MAP (U.S.D.A.)
SAN LUIS REV QUADRANGLE
SHEET22
SCALE 1 "=2000'
\
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TABLE 11.--INTERPRETATIONS FOR LAND MANAGEMENT--Continued
Map
symbo
LfE
LpB
LpC
LpC2
LpD2
LpE2
LrE
LrE2
LrG
Soil
Las Flores-Urban land complex, 9 to 30 percent slopes:
Las Flares--------------------------------------------
Urban land--------------------------------------------
Las Posas fine sandy loam, 2 to 5 percent slopes----------
Las Posas fine sandy loam, 5 to 9 percent slopes----------
Las Posas fine sandy loam, 5 to 9 percent slopes,
eroded.
Las Posas fine sandy loam, 9 to 15 percent slopes,
eroded .
Las Posas fine sandy loam, 15 to 30 percent slopes,
eroded.
Las Posas stony fine sandy loam, 9 to 30 percent
slopes.
Las Posas
slopes,
Las Posas
slopes.
stony fine sandy loam, 9 to 30 percent
eroded.
stony fine sandy loam, 30 to 65 percent
LsE Linne clay loam, 9 to 30 percent slopes------------------
LsF Linne clay loam, 30 to SO percent slopes-----------------
Lu Loamy alluvial land--------------------------------------
LvF3 Loamy alluvial land-Huerhuero complex, 9 to 50 percent
slopes, severely eroded:
Loamy alluvial land----------------------------------
Huerhuero--------------------------------------------
Md ~ade land------------------------------------------------
i:{·~· ··~inrii··f~~~,{5i~}:}:i~: ·~··~6· ;o~}~~~~~r~~~~;=-:::::-::u ·
MnA Mecca coarse sandy loam, 0 to 2 percent slopes-----------
MnB ~ecca coarse sandy loam, 2 to 5 percent slopes-----------
MeA ~ecca sandy loam, saline, 0 to 2 percent slopes----------
MpA2 ~ecca fine sandy loam, 0 to 2 percent slopes, eroded-----
MrG Metamorphic rock land------------------------------------
MvA ~ottsville loamy coarse sand, 0 to 2 percent slopes------
MvC ~ttsville loamy coarse sand, 2 to 9 percent slopes------
MvD ~ottsville loamy coarse sand, 9 to 15 percent slopes-----
MxA Mottsville loamy coarse sand, \'let, 0 to 2 percent
OhC
OhE
OhF
OkC
slopes.
01ivenhain cobbly loam, 2 to 9 percent slopes------------
Plivenhain cobbly loam, 9 to 30 percent slopes-----------
Olivenhain cobbly loam, 30 to 50 percent slopes----------
Olivenhain-Urban land complex, 2 to 9 percent slopes:
Olivenhain-------------------------------------------
Urban land-------------------------------------------
OkE Olivenhain-Urban land complex, 9 to 30 percent slopes:
PeA
PeC
PeC2
PeD2
PfA
Olivenhain-------------------------------------------
Urban land-------------------------------------------
Placentia sandy loam, 0 to 2 percent slopes--------------
Placentia sandy loam, 2 to 9 percent slopes--------------
Placentia sandy loam, 5 to 9 percent slopes, eroded------
Placentia sandy loam, 9 to IS percent slopes, eroded-----
Placentia sandy loam, thick surface, 0 to 2 percent
slopes.
PfC Placentia sandy loam, thick surface, 2 to 9 percent
slopes.
Py Playas---------------------------------------------------
See footnotes at end of table.
36
Hydro-
logic
group
D
D
D
D
D
D
D
D
D
D
c
c
B
D
D
D
A -A-
B
B
B
B
D
A
A
A
D
D
D
D
D
D
v
D
D
D
D
D
D
D
D
Erodibility
Moderate 2----
Moderate 2----
Moderate 2----
Moderate 2----
Moderate 1---
Moderate 1---
Moderate 1---
Severe 1-----
Moderate 2---
Severe 1-----
Severe 16----
Severe 1-----
Severe 1-----
Severe 2-----
·severe 2-----
Severe 16
Severe 16
Severe 16
Severe 16
Severe 1-----
Severe 2-----
Severe 2-----
Severe 2-----
Severe 2-----
Severe 16----
Severe 16----
Severe 1-----
Severe 9-----
Severe 9-----
Severe 9-----Severe 9-----Severe 16----
Severe 16----
Moderate 2
\..imitat.:. ::::-_~.
COTI'"•;e::-::_ -···
fro;:: :-:·_; ·
5..;.. ;..: :.~
Sl:;:w-:
~::. ;:·· --
~::~--·~
Slight.
Slight.
Moderate.
Moderate.
Moderate.
Moderate.
Moderate.
Slight.
Severe.
Severe.
Slistht.
Slight-.--
Severe.
Slight. if
Slight. 41
Slight. 4i
Slight. !i
Slight.
Slight.
Moderate.
Slight.
Slight.
Slight.
Slight.
Slight.
Slight.
•• II II II II II II II IJ II II IJ II II II II 1111 II
SUMMARY TABLE OF HYDROLOGY CALCULATIONS
HAMPTON INN SUITES
05-03/DEV 05-19/ZC 05-02/GPA 05-05/LCPA 05-02/SDP 05-04/EIA 05-02/CDP
EXISTING
CONDITION
BASIN A
BASIN B
BASIN C
BASIN 0
POST
-CONSTRUCTION
BASIN A
BASIN B
BASIN C
BASIN 0
c
0.76
0.76
0.76
0.76
0.76
0.76
0.76
0.76
Tc
(min.)
7.1
7.1
6.2
5.6
6.1
6.1
6.2
5.9
I
(''lhr)
5.25
5.25
5.73
6.12
5.79
5.79
5.73
5.92
A
(acres)
0.27
0.62
0.26
0.09
0.23
0.23
0.31
0.12
Q
(cfs)
1.1
2.5
1.1
0.4
1.0
1.0
1.3
0.5
LlQ
(cfs)
1.4
<0.7>
-0-
<0.8>
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10.0
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!' " .... ... 8.0 ( 1) From precipitation maps determine 6 hr and 24 hr amounts ' ._, ' i'o l"o.~' 1.0 ~ tor the selected frequency. These maps are Included in the
" ' " r--i"o. .. i'o EQUATION County Hydrology Manual (10, 50, and 100 yrmaps included
6.0 I 7.44 Pa o-0.645 In the Design and Procedure Manual).
~, ~t... to ~ ~"I'-I =
5.0 ' I ::: Intensity (inlhr) (2) Adjust 6 hr precipitation (if necessary) so that it Is within
~"" ' -.... .... 1'-Pe = the range of 45% to 65% of the 24 hr precipitation (not
4.0 "' 6-Hour Preclpltafion ( in) applicaple to Desert). ' ~ .. i'o D = Duration (min) r. .... (3) Plot 6 hr precipitation on the right side of the chart.
3.0 .. , ~r-.. .. (4) Draw a line through the point parallel to. the plotted lines.
.... i'o (5) This line Is the Intensity-duration curve for the location
~ .... '~ being analyzed. ~:-... ... ~ 2.0 I I' 'r-. i'o.~ :-...~" Application Fonn: ,~ I 1 ... ~ .1'-o <p (a) Selected frequency __ year 'C' "l'o I 1'. ... /' ::t
:::1 0
(b) P6 ,., Z .5 in., P24 ,., ~ .:6 = t;;' i ""
c ~%(2) ....
1 ... , ... ..,
f.. 1J
'~ iii 24
~1.0 .... n (c) Adjusted P6(2l::: Z · S' in. '6'
i0.9 . ·' r... 6.0 S' -5.5 cr. (d) lx = __ min. I .... 5.0 g 0.8 .
!o.r ' 4.5 '§' (e) I., in.lhr.
l'o., n ---4.0 i6
0.6 3.5.!!!.
... Note: This chart replaces the Intensity-Duration-Frequency
0.6 3.0 curves used since 1965. ...
0.4 '"!-. 2.5 ~~rt~ij~t-.~r::pf1~.:.y.~~::_jtr =l~~ .. ~rf!:·t~· : ~jr· : ..... r ,, iiif ___ ,, ouiiiiioo· 2.0 --$ ~ ~~.l~OO!lt~r~TI~~ 0.3 --~-,
·----10 .. ~t_?.53 3_.~.J...1,g!.~!l!J 5.90 -6.74 . .],5818.42. 9.27 -~!hl.t
1.5 '"•""15 J.~<!-~,9,_{i, .1!.:.~!1 .. 1 3.24 m'~~t~=~ ~.19".'?:!~ ... ,_~~'.!~ '[,13 .... E'l. ·--··-2o
0.2 .=:-----~ -A:~~-HB1Hh~ i::~+H~ -HtT-:::~ .. t~:~~ ... ·Hi --~:~
30 ~JlE'!lli!!?.i~!!! @:jlli~<l! :fi!! ---·-40
I -· ---· -1.0 .. ---··so fJ 1 ~;~ 1~1-:.H~}~.t;:1~.:Ur~~~tii.[~:~;it -~r[:J~~~ .. ----·-ao ~ 1&:~ ~:~±~H;lt~ ~HitJH:\fM:I~~d.1~----90 ----rzn -·--tso -~t,%.~Jl~·11:*J.@~t~ &
0.1 ----180 ..M!. ~ ..!1:§! !!~ o.z!~:!l.1 .h!.li J.J.U.1.~1. H1.. -~ I --24o 5 6 7 8 9 10 15 20 30 40 50 1 2 3 4 5 6 --"'300 0.22 0.33 0 .• 43 0.54 Jq~§ ~ ~!!.. . .!!:~~-j.J;Q!'I1.f{j 1.30
Minutes Hours --366 fg 0"?8 9_,_3!1. .Q,11..J.Q,_~,~~~ Q,_rg_ .. l1:!? .. ;..9!~-!!~~ J~
Duration 0.1710.25 0.33 0.42·0.50!0.58 0.67 0.75 i 0.84' 0.92 1.00
'· . -F I G UR E
Intensity-Duration Design Chart-Template 3-1
\•
-• -• -• -
•
• • ..
• -• -----.. -.. -.. -.. ---
IIIII
.6.E
Feet
5000
4000
3000
2000
400
300
200
100
5
Tc =
Tc =
L =
..6.1: =
EQUATION
(1~~3y.385
Time of concentration (hours)
Watercourse Distance (miles)
Change in elevation along
effective slope line (See Figure 3-5)(feet)
L
Miles Feet
0.5
L
.
3000 '
2.000
1800
1600
200
' ' '
Tc
Hours Minutes
' ' '
Tc
240
180
120
60
s
1111 SOURCE: California Division of Highways (1941) and Kirpich (1940) -Nomograph tor Determination of -Time of Concentration (Tc) or Travel Time (Tt) for Natural 'Mltersheds
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PLOT DATEI 10/10/05