HomeMy WebLinkAboutCDP 02-42; DUNN RESIDENCE; HYDROLOGY REPORT; 2004-07-22-·
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HYDROLOGY REPORT
FOR
James Dunn
Via Real Apartments #9
2701 Avenida De Anita
Carlsbad, CA 92008
PROJECT
Dunn Residence
CDP 02-42 I HDP 02-1-0 .
DRAWING NO. 421-9A
PREPARED BY:
Aquaterra Engineering Inc.
1843 Campesino Place
Oceanside, CA 92054
tele: 760-439-2802
fax: 760-439-2866
July 22, 2004
]Under the supervision of:
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• Project Description
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The 2.6 acre -project site is currently vacant . The surrounding adjacent lands
have been partially developed with single family structures on standard sized
residential lots. Access to the project is Highland Drive. The project is proposed
to be developed with one residential building and a garage structure with paved
driving_ surfaces.
The City of Carlsbad intends to upgrade and realign an existing public storm
drain system which crosses the site and transports the offsite storm flows.
The existing site topography slopes· in the northwesterly direction with steep
slope gradients. The proposed building pad shall be graded for the residential
structures, the remainder of the site shall remain as steep slopes. The
development will alter the· existing drainage patterns from the existing pre-
development condition. Instead of all storm flows drainage to the adjacent
canyon, a portion of the site, principally the developed building pad (0.27 acres), will be collected by catch basins and piping system that connects directly to the
City constructed drain system. ,
As a result of the propqsed construction of the-structures and paved surfaces,
the calculated 100 year frequency storm water volumes will be increased by 0.15
cfs.
As mitigation for the calculated increase storm water discharge volumes and
velocities, the storm flows from the impervious surfaces shall be discharged
onsite and conveyed through shallow grass lined channels and a collection box
with filtration media to remove all polluting contaminants and reduce the
drainage flow velocities before leaving the project site.
There is no historical. evidence that the downstream water courses are
inadequate to handle the storm flows. Due to the minimal modification of the site
development, we do not believe that any downstream properties will be
adversely impacted by the proposed devel~pment..
The project site is not located near a floodway or floodplain or a water course
plotted on any official floodway map.
Conclusion
As a result of the project layout and the .inclusion of design features, we do not
anticipate any negative impacts to downstream properties .
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Hydrology & Hydraulics Report
City of Carlsbad
This Hydraulics and Hydrology Report was prepared using the following
Manuals:
Hydrology Manual, County of San Diego , Dated June 2003
Drainage of Highway Pavements, U.S. Dept. of Transportation
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
Rainfall /soph1vials
100 Yenr Rnlnfall Event-6 Hours
tsopluvlal (Inches)
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_ • • · 1 1 I I : 1: 111 Ill: 10.0 ..._ ... ,.,_ I ' I I I I I r.11-11111111111111,U I II I II ,Ill 11111111 . '', ..... ""' .... , ., ' 1i.o ...._. , 1...., N 8°0 ,~ l'lo.. -
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s o l'lo.. ' ' • " ~ I = Intensity {In/hr} . .~ "r-,. .. ~:,,,
""'"' r--.r,. I" I"' ~ 1• ~ ~ Pa = 6-Hour Precipitation {In)
4.0~ i' I"~ ~ ~ o = Duration tmlnl •. I' " ·~. ~,.,
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6 6 7 8 9 10 15 20 30
Minutes
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40 50 1
DuraUon
2 3
Hours
4 5 6
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Dlrecttons for Appllcatlon:
(1) From_preclpl .. tloo maps determine e hr and 24 hr amounts
for the selected frequency. These maps are Included in the
County Hydrology Manual (10, so, ~nd 100 yr maps Included
In the Design and Procedure Manual),
(2) Adjust 6 hr precipitation (if necessary) so that It I~ within ·
the range of 45% to 65% of the 24 hr precipitation (not
applioapl& :to Desert).
(3) Plot6-hr precipitation on the right side of the chart.
(4) Draw a line through the point parallel to the plotted llnes.
(5) This line Is the lntemslty-duratlon curve fcir the location
being analyzed.
Application Fonn:
(a) Selected frequency_:. year
~ ,.-.;:,. ,.,,. ,= p 5' -(b} Pe:::.~-•-~ in~. Pz4 = T,::;t:i, 'P 6 = __ ·\-:::._%c21
24
(c) Adj_usted P6<2>= t..5._in.
(d) tx = --.-min.
(e) I= _Jn./hr.
· Note: This chart replaces the lntenslty-Ouratlon-Freque!1CY
curves used since 1965.
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___ 20 ,1,08_ 1,62 2.15J.!&!1_~,23 3,77 4,31 4,85 l 5,39, 5,93 6.46. ':=~=-~~ g::~· 1:~~ll@J~~:~ i:: :~:~~-1~:~gH:~~-L!:~-.. Ulr.
40 0,69 1.03 1,38< 1.72;2.07 2.41 2,78 f3,10 I 3.45 3.79 4.13 --.. :~ g::~ g::~ -~:~I ~::~-1!:~: ~:~:-;:~ l~:i~ --~:::--~:~: .. ~:~:-
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360 0.17 0,2510,3310,42i0.50 0.5B 0,67 0.757 0.84, 0.92 1.00
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San Diego County Hydrology Manual
Date: June 2003
Table3-1
Section:
Page:
RUNOFF COEFFICIENTS FOR URBAN AREAS
Land Use I Runoff Coefficient "C"
Soil TYpe
. NRCS Elements Coun Elements %IMPER. A B C
.Yn~~-J.err~ll}.Ct,:!aturlll)_ Pel1!)!1Q.l?DLQpen ~p~q_e . O* 0.20 0.25 ., .O,JQ....
J~ty-~i~tial <!:-.P..~L. ... )l~~idential1 1.0 DU/A or less 10 0.27 0.32 .J1.~
Low Density Residential (LDR) Residential, 2.0 DU/A or less 20 0.34 0.38 0.42
Low·Density Residential (LOR) Residential, 2.9 DU/A or less 25 0.38 0.41 0,45
Medium Density Residential (MOR) Residential, 4.3 DU/A or less 30 0.41 0.45 0.48
Medium Density Residential (MDR) Residential, 7.3 DU/A or less 40 0.48 0.51 0.54
Medium Density Residential (MDR) · Residential, 10.9 DU/ A or less 45 0;52 0.54 0.57
Medium Density Residential (MDR) Residential, 14.5 DU/A or less _ 50 0.55 0.58 0.60
High Density Residential (HOR) Residential, 24.0 DU/A or less 65 0,66 0.67 0.69
High Density Residential (HDR) Residential, 43.0 DU/A or less 80 0.76 0.77 0.;t8
Commercial/Industrial (N. Com) Neighborhood Commercial 80 0.76 0.77 0.78
Commercial/Industrial (G. Com) General Commercial 85 0.80 0.80 0.81
Commercial/Industrial (O.P. Com) Office Professional/Commercial 90 0.83 0.84 0.84
Commercial/Industrial (Limited I.) Limited Industrial 90 0.83 0.84 0.84
Commercial/Industrial (General I.) General Industrial 95 0.87 0.87 9.87
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 will remain undisturbed in perpetuity. Justification must be given that the area will remain natural forever (e.g., the ar~a
is located in Cleveiand National Forest).
DU/A= dwelling units per acre
NRCS = National Resources Conservation Service
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Sa11 Diego County Hydrology Manual Section:
· Date: June 2003 Page:
3
12of26
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 wpere the drainage basin area is 20 to 600 acres.
Table 3-2 provides limits ofth.e length (Maximum Length (LM)) of sheet flow to be used in
hydtology studies. Initial Ti values based on. average C values for the Land Use Element are
also inclµded. These values can b~ used in planning and design applications as described
below. Exceptions may be approved by the "Regulating Agency" when submitted with a ..
detailed study.
Table3-2
MAXIMUM OVERLAND FLOW LENGTH (LM)
& INITIAL TIME OF CONCENTRATION (Ti)
. Element* DU/ .5% ... ·. 1% 2% 3% 5% 10%
Acre LM Ti 'LM Ti LM Ti LM Ti LM Ti LM Ti
Natural 50 13.2. 70 12.5 . 85 10.9 100 10.3 100 8.7 JOO 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 JOO 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 so 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 1 SQ 4.7 60 4.1_ . 75 · 3.6.· 85 3.4 90 2.9 100 2.4
O.P./Cotn · 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 ~ *See Table 3-1 for more de~iled description
2.7 80 2.6 90 2.3 100 1.9
3-12
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AE
Feet
5000
4000
Tc
Tc
L
.6.E
EQUATION
= (1~3)0.385.
=
=
=
Time of concentration (hours)
Watercourse Distance (miles}
Ctiange in elevation alon9
effective slope fine (See Rgure 3-5)(feet) ·
3000 Tc
Hours Minutes
2000 240
180
2 120
1 60
3D0 50
200 40
L
Miles Feet 30
100
20
18 . 3000 16
0.5 ' ' 14
2000 ' ' 12
1800 ' 1600 ' 10 30 1400 ' 9
8
20 1
6
5
10 4
300 3
5
200
: . AE L Tc
SOURC!=: California Division of Highways (1941) arid K'nplch (1940)
Nomograph for Determination of
nme of Concentration (Tc) or Travel Time (Tt) for Natural W::rtersheds
·--~
FIGURE
I .. 3-4 I
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0
()
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TABLE 11.--INTERPRETA~IONS FOR LAND MANAGEMENT--Continued
·soil Hydro• Erodibility
logic
group
Limitations for
conversion
from brush to
grass
CaD2 alpine coarse sandy loam, 9 to 15 percent slopes, B Moderate 2---Slight. y
eroded.
CbB arlsbad gravelly loamy sand, 2 to s· percent slopes------C Severe 2-----Slight.
~~f..,"1., ~~Ji~~~&,Jrll-,~4.,~frl~~~~. ~}~~-::-;,~-..::.-_S,. _ _!>evere 2-----Slight. CbD Carlsbad gravelly loamy sancf, 9 to 15 percent slopes------· C ss-::e~v""e,::r~e----lc---,-,~1glft"'"-. --
CbE Carlsbad gravelly loamy sand, 15 to· 30 percent slopes----C Severe 2-----Slight.
CcC Carlsbad-Urban land complex, 2 to 9 percent slopes-------D
CcE -~r];sb~d-Urban land complex, 9 to 30 percent slopes------D
CeC Carrizo very gravel~y sand, Oto 9 percent. slopes--------A
CfB hesterton fine sandy loam, 2 ·to 5 percent slopes-~------D
CfC hesterton fine sandy loam, S to 9 percent slopes--------D
CfD2 Chesterton fine sandy loam, 9 to 15. percent slopes, D
CgC
ChA
ChB
CkA
ClD2
eroded.
· esterton-Urban land complex, 2 to 9 percent slopes:
Chesterton-------------------------------------------
Urban land------------------------------------------
ino fine sandy loam, 0 to 2 percent slopes-------------
hino fine sandy loam, 2 to ·s percent slopes-------------
hino silt loam, saline, 0 to 2 percent slopes-----------
ieneba coarse sandy loam, 5 to 15 percent slopes,
ero~ed.
C1E2 · ieneba coarse sandy loam, 15 to 30 percent slopes,
eroded.
ClG2 ieneba coarse sandy loam, 30 to 65 percent slopes,
eroded. ·
D
D
-C
C
C
B
B
B
Severe
Severe
Severe
Severe
2 9-----9-----9-----
Severe 16----
Severe 16----
Moderate 2---
Severe 16----
Severe 16----
Severe 1-----
Slight.
Slight.
Moderate.
s1ight.
Slight.
Moderate.
Severe.
Severe.
Severe.
•
CmE2
CmrG
ieneba rocky coarse sandy lpam, 9 to 30 percent
slopes, eroded.
ieneba very rocky coarse sandy loam, 30 to· 75 percent
slopes.
B
B
Severe 16----Severe.
Severe 1-----Severe.
•
CnE2 ieneba-Fallbrook rocky sandy loams, 9 to 30 percent
slopes, eroded:
Cieneba -·-------------------------------------------Fallbrook-------------------------------------------CnG2 ieneba-Fallbrook rocky sandy loams, 30 to 65 percent
Co
Cr-
CsB
CsC
CsD CtE
CtF
CuE
CuG
slopes, e-roded:
Cieneba-------.-------------------------------------Fallbrook-----------------. -------------+---· ------·-
·. layer .alluvial. .l.and,--------------:-----------------------,.--
oasta:l beaches--------. -----· -----· ----------·--
rralitos loamy sand, 0 to 5 percent slopes---.,.---------
orralitos loamy sand, 5 to 9 percent slopes------------,-
orralitos loamy sand, 9 to 15 percent slopes---------~--
rouch coarse sandy loam, 5 to 30 percent slopes---------
rouch coarse sandy loam, 30 to 50 percent slopes--------
rouch rocky coarse sandy loam, 5 to 30 percent
slopes.
rouch rocky coarse sandy loam, 30 to 10 percent
slopes.
CvG rouch stony fine sandy loam, 30 to 75 percent
DaC
DaD
DaE
DaE2
DaF
slopes.
iablo clay,
Diablo clay,
iablo clay,
iablo clay,
iablo clay,
2 to 9 percent slopes-----------------------
9 to 15 percent s.:j.opes----------------------15 to 30 percent slopes-------'---.; _________ _
15 to 30 percent slopes, eroded-------------
30 to SO percen:t slopes---------------.-----""
See footnotes at end of table.
B
C
B
C
D
A
A
A
A
B
B
B
B
B
D
D
D
D
D
Severe 16----
Severe 16----
Severe 1-----
Severe 1-----
Moderate 2---
Severe 2
Severe 2-----
Severe 2-----
Severe 2-----
Severe 16----
Severe 1-----
Severe 16----
Severe 1-----
Severe 1-----
Slight--------
Slight--------
Moderate------
Moderate 1---
Severe 1-----
Severe.
Severe.
Severe.
Severe.
Slight.
Slight.
Slight.
Slight.
Slight.
Moderate.
Moderate.
Moderate.
Moderate.
Slight. 'Y_
Slight. 1/
Slight. 1/
Slight. 1/
Moderate:-Y
33
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HYDRAULIC REPORT
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