HomeMy WebLinkAboutCT 03-13; BLACK RAIL RIDGE; DRAINAGE STUDY; 2003-08-28~I
I
'I
,I
-I
:1
,I
1
I
I
I
I
1
I
1
I
-I
ENGINEERING
Pro f e s s ion a lei v i I E n·t i nee ran d Lan d Sur v ~y 0 r
RECEIVED
SEP '11 20C1
CITY OF CARLSBAD
PlANNiNG DEPT.
DRAINAGE STUDY
TENTATIVE MAP CT 03-___ _
BLACK RAIL RIDGE cr07~i/
600 S_ ANDREASEN DRIVE· SUITE E • ESCONDIDO, CA 92029
PHONE: 760 741-3577 • FAX: 760 897-2165 • E-MAIL: MLBENESH@PACBELL.NET
I
I
I
I
I
I
.1
I
I
'I
)
I
I
I
I
1
1
1
Purpose
Hydrology Study
August 28, 2003
Page 1
The purpose of this Drainage Study is to determine and compare the Pre-Development and Post-Development ultimate
storm flows for the proposed project, and to determine the Water Quality Design Storm flows for the developed site.
Ultimate Storm flows will be based on the 10 year and 100 year 6 hour storm as defined in· the San Diego County
Hydrology Manual. Water Quality Treatment Design Storm Flows will be based a 6 hour storm event of 0.2mchesper hour,
which approximates an 85th percentile storm event.
Site Description
The proposed site consists of approximately 3.6 acres and adjoins Black Rail Road to the East and Poinsettia Lane to the
North. Currently the site is used for agricultural purposes. There are no existing permanent structures.
The proposed development is an 11 lot subdivision.
There are no existing off-site storm flows entering the site.
The storm runoff from the majority of the site, 3.16 acres, currently sheet flows across the, westerly property line to, the
adjoining property. A smaller area, adjoining the unimproved dirt road known as Street "An, drain.s along the dirt road until it
also flows across the westerly property line to the adjoining property ..
After development, the area draining to Street A will be increased by approximately 0.36 Acres. Ultimately all the runoff
ends up in a natural drainage area 600' westerly of this site.
Hjdrology
The Rational Method as outlined in the San Diego Hydrology Manual is used to determine peak flows. Time of
concentration is derived from Appendix X-A for the undeveloped site and Appendix X-C for the developed site.
Table 1 -Anticipated vs. Existing 10 year Storm Flows
Drainage Facility Existing Condition Proposed Proposed
Flow from site, Ql0 Development Flow Development Flow, Q2
(CFS) from site, Ql0 (CFS)
LCFS)
Street A 0.7 1.2 0.9
Westerly Property Line 3.1 2.7 i.1
Total 3.8 3.9 2.0
600 S. ANDREASEN DRIVE' SUITE E • ESCONDIDO, CA 92029
PHONE: 760 741-3577 • FAX: 760 897-2165 • E-MAIL: MLBENESH@PACBELL.NET
I I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
Design of Vegetated Swa/e (Lots 1-5)
Hydrology Study
August 2&, 2003
Page 2
Ideally, vegetated swales should be used on sites with slopes of less than 4 percent; nu:i.off velocities witl;Un channels can
become too high on steeper slopes, causing erosion and inhibiting infiltration and filtering in the swale. The lncorporation of
permanent checkdams will also increase the impound time for treatment of the stOrnl flows by
Swale bottoms should not exceed 8 feet in width, with 4H:1V or flatter side slopes. The depth of the swale should carry the
anticipated 10-year sto= runoff with approximately 6 inches of freeboard. Typically, the swale should be designed to convey
the runoff from a 2-year storm event, without erosion, and the flow based treatment volume should be based OlY a design storm
of 0.2 inches per hour. Table 2 summarizes the results of the hydrology and hydraulic calculations for the proposed vegetated
swale in Drainage Areas 4 and 5.
Table 1
Hydrologic and Hydraulic Results for Proposed Vegetated Swale, Area 4-& 5
" c:: 0 ... • ..:3 ...c:
~ 1i -c:: c:: ....
v .§ ... u v c:: ~ '" '" (5 c::
!:l "-"'" ~ CI) ..... ..s tI.. '" < c:: ..... U v
·0 0 -a '"
~~ v ~ d c:: c.S-<
~ ~ ~ ~ .... .e-v tt:t ~.
0 0 0 ·0
~ u J u:: ..9 tt:t ~ ~ ~ ·m 0 8 13 o-~. ... ~ 0-1;i J v ... .g-. ~ v Q ~ Q ~
Treatment Storm 2.72 0.47 NA 0.2 0.26 0.5 0.7
2-Year Sto= 2.72 0.47 18 1.56 2.0 1.5 1.3
10-Year Sto= 2.72 0.47 18 2.11 2.7 1.8 1.5
The total depth of the swale varies but is at least l' below the pad grades. The bottom width of the swale is 8 feet, with a
2:1 slope against Poinsettia Lane, and a slope of approximately 4-5% on the southerly side.
A general:rule of thumb for sizing vegetated swales, as noted in the information included in Appendix A, is one percent of
the area that drains into the swale. For the proposed swale on this project, the area required would be approximately 1180 square
feet, or a swale 8 feet wide by 148 feet long. The actual dimensions of this swale will be 8 feet wide by 285 feet long
Based on the maximum velocity expected for the design storm, and the length of the swale, the hydraulic residence time for
runoff flowing through the swale is approximately 6.8 minutes.
600 S. ANDREASEN DRIVE· SUITE E • ESCONDIDO, CA 92029
PHONE: 760 741-3577 • FAX: 760 897-2165 • E-MAIL: MLBENESH@PACBELL.NET
• I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
Design of Vegetated Swaie (LIlt 8)
Hydrology Study
August 28, 2003
Page 3
Ideally, vegetated swales should be used on sites with slopes of less than 4 percent; runoff velocities within channels can
become too high on steeper slopes, causing erosion and inhibiting infiltration and filtering in the swaIe. The incorporation of
permanent checkdams will also increase the impound time for treatment of the storm flows by
Swale bottoms should not exceed 8 feet in width, with 4H:l V or flatter side slopes. The depth ot theswale should carry the
anticipated 10-year storm runoff with approximately 6 inches of freeboard. Typically, the swale should be designed to convey
the runoff from a 2-year storm event, without erosion, and the flow based treatment volume should be based on a design storm
of 0.2 inches per hour. Table 2 summarizes the results of the hydrology and hydraulic calculations for the proposf;d vegetated
swale in Drainage Areas 4 and 5.
Table 2
Hydrologic and Hydraulic Results for Proposed Vegetatl,!d Swale, .Al:ea 3 . t:: ... 0 '.p A
~ «I ....... .l:! Q
Q ......
<U .£ .... u ~ Q on
on S-o Q U .f:l ~ 2:l +-> Q on < Q ..... ...... U <U
<U 0 -B on
«In '0 <U ~ d Q .& l:E ...... 2:l <U ~ J ~ Ei e--< 0 0 0 '0
~ U Q fI:: 0
~ ~ ~ ~ ~ Q 0 ~ -:S ·ta Q i~ <U C. .~ .... ~ < <U Q ~ Q ~
Treatment Storm 1.42 0.50 NA 0.2 0.14 0.4 0.6
2-Year Storm 1.42 0.50 15 1.69 1.2 1.6 1.5
10-Year Storm 1.42 0.50 15 2.39 1.7 1.9 1.7
The total depth of the swale varies but is over one foot deep. The bottom width of the swale is .6 feet, with a 2:1 slope
against Poinsettia Lane, and a 4:1 slope on the southerly side.
A general rule of thumb for sizing vegetated swales, as noted in the information included in Appendix A., is one pe:rcent 6f
the area that drains into the swale. For the proposed swale on this project, the area required would be approximately 620 square
feet, or a swale 6 feet wide by 104 feet long. The actual dimensions of this swale will be 6 feet wide by 120 feetlong
Based on the maximum velocity expected for the design storm, and the length of the swale, the hydraulic residence time for
runoff flowing through the swale is approximately 3.3 minutes.
Combined with the residence for the swale in areas 4 and 5 the total treatment time is 3.3 + 6.8 = 10.1 Min.
600 S. ANDREASEN DRIVE· SUITE E • ESCONDIDO, CA 92029
PHONE: 760 741-3577 • FAX: 760 897-2165 • E-MAIL: MLJ3ENESH@PACBELL.NET
'·1
I
I
I
I
I
I
I
I
I
I
I
1
I
I
Street A -D01V!lStream
Hydrology Study
August 28, 2003
Page 4
Downstream of this site is an unimproved dirt dirveway on private property. At its flattest stretch, it has ?bout 2% fall, The
driveway collects runoff from the north and east and conveys it generally to the west towards Poinsettia Lane.
600 S. ANDREASEN DRIVE' SUITE E • ESCONDIDO, CA 92029
PHONE: 760 741-3577 • FAX: 760 897-2165 • E-MAIL: MLBENESH@PACBELL.NET
-------------------
.
!
I
'\
Rational Method Calculation Form
Project: CT 03-
Drainage Soil & A
Area Develo~ment Acres
Area 0 C -SFR 0.35
Area 1 C-SFR 0.62
Area 2 C -SFR 0.45
Area 3 C -Rural 0.34
Area 4 C-Rural 0.48
Area 5 C-SFR 0.38
Area 6 C-SFR 0.40
Area 7 C-SFR 0.60
I C Q
In.lHr. CFS
3.80 0.50 0.7
3.61 0.50 1.1
3.61 0.50 0.8
3.47 0.40 0.5
3.27 0.40 0.6
3.12 0.50 0.6
3.98 0.50 0~8
3.80 0.50 1.1
, '
Frequency 100 Year
Post-Development
SumQ Slope Section
CFS
0.7 0.03 112 Str
1.8
2.6 0.01 Swale
3.1 0.01 Swale
3.7 0.01 Swale
4.3
0.8 0.07 1/2 Str
1.9
, ,
V
I/Sec.
3
2
1.6
1.7
4
L T
Ft. Min.
200 1.1
120 1.0
150 1.6
135 1.3
240 1.0
.
SumT
14.0
15.1
15.1
16.1
17.7
19.0
10.0
13;0
14.0
--
Calculated by MB
Date:28 August 2003
Remarlls
Appendix X-C
d=0.22' (Plate D-7.7)
1% Turf Swale 6' Wide
1 'Yo Turf Swale 8' Wide
1 'Yo Turf Swale 8' Wide
Sheet Flow Across P.L.
Tc=lO Minutes Assumed
Sheet Flow Across P.L.
d<0.2' (Plate D-7.7)
•
-------'. .. - - - - - - - ---- - - - - - - - - -
h
? ..
Rational Method Calculation Form
Project: CT 03-
Frequen~y 10 Year
Post-Development
Calculated by MB
Dat~:28 August 03
Drainage I Soil & A I C Q Sum Q Slope Section V L T Sum T Remarks
Area DeveloJ!ment Acres In.lHr. CFS CFS '/Sec. Ft. Min.
Area 0 C -SFR 0.35 2.44 0.50 0.4 14.0 Appendix X-C 0.4 0.03 112 Str 2.5 200 . 1.3 1----1----....:....:--------1
Area 1 C -SFR 0.62 2.30 0.50 0.7 15.3 d=<0.2' (Plate D-7.7) 1.1 Area 2 C -SFR 0.45 2.30 0.50 0.5 15.3 1.7 0.01 Swale 1.7 120 1.21----;-----------i
Area 3 C -Rural 0.34 2.19 0.40 0.3 I 16.5 1'7'0 Turf Swale 6' Wide 2.0 0.01 Swa e 1.5 150 1.7 I----;-----------i Area 4 C-Rural 0.48 2.06 0.40 0.4 18.2 1'7'0 Turf Swale 8' Wide 2.4 0.01 Swale 1.6 135 1.41----;-----------i
Area 5 C-SFR 0.38 1.97 0.50 0.4 19.6 1'7'0 Turf Swale 8' Wide I 2.7 Sheet Flow Across P.L.
10.0 Tc=lO Minutes Assumed
Sheet Flow Across PL
Area 6 C-SFR 0.40 2.56 0.50 0.5 13.0 d<0.2' (Plate D-7.7) 0.5 0.07 1/2Str 4 240 1.01---;----:....-.--.-:....-Area 7 C-SFR 0.60 2.44 0.50 0.7 14.0 1.2 t----+---------
_, • ~ -_0
j ___ • __ ~L __ , __ . _~' ___________ "_ L~_ ~~ _ _____ ~_
-------------------
-J
Rational Method Calculation Form
Project: CT 03-
Drainage Soil & A
Area Development Acres
Area 0 C-SFR 0.35
Area 1 C-SFR 0.62
Area 2 C-SFR 0.45
Area 3 C -Rural 0.34
Area 4 C-Rural 0.48
Area 5 C-SFR 0.38
Area 6 C-SFR 0.40
Area 7 C.,SFR 0.60
I C Q
In.lHr. CFS
1.76 0.50 0.3
1.66 0.50 0.5
1.66 0.50 0.4
1.58 0.40 0.2
1.49 0.40 0.3
1.42 0.50 0.3
1.85 0.50 0.4
1.76 0.50 0.5
Frequency 2 Year
Post-Development
SumQ . Slope Section
CFS
0.3 0.03 1/2 Str
0.8
1.2 0.01 Swale
1.4 0.01 Swale
1.7 0.01 Swale
2.0
0.4 0.07 1/2 Str
0.9
V L
liSec. Ft.
2.5 200
1.5 120
1.6 150
1.7 135
4 240
T SumT
Min.
14.0 1.3
15.3
15.3
1.3
1.6 16.7
1.3
18.2
19.6
10.0
1.0 13.0
14.0
(
Calculated by MB
Date:28 August 2003
Remarks
Appendix X-C
d=<0.21 (Plate D-7.7)
1 'Yo Turf Swale 61 Wide
l'Yo Turf Swale 81 Wide
1 'Yo Turf Swale 81 Wide
Sheet Flow Across P.L.
Tc=lO Minutes Assumed
Sheet Flow Across P.L.
d<0.21 (Plate D-7.7)
-
•
- - - - -~ - - --- - - - - - --'--
"<J
Rational Method Calculation Form
Project: CT 03-
Drainage Soil & A
Area Development Acres
Area A C -Rural 3.16
Area B C -Rural 0.66
~~.--.----.~--
I C
In.lHr.
3.76 0.40
3.94 0.40
Q
CFS
4.8
1.0
Frequency 100 Year
Pre-Development
SumQ Slope Section
CFS
4.8
1.0
" ,
V
'/Sec.
L T SumT
Ft. Min.
14.2
13.2
Calculated by MB
Date:28 August 03
Remarks
Appendix X-A
Sheet Flow Across P.L.
Appendix X-A
- -... -.. ,-- - - -.... _. - - - ----
~
Rational Method Calculation Form
Project: CT03-
Drainage Soil & A
Area Development Acres
Area A C -Rural 3.16
Area B C -Rural 0.66
I C
In.lHr.
2.42 0.40
2.54 0.40
..
Q
CFS
3.1
0.7
Frequency 10 Year
Pre-Development
SumQ Slope Section
CFS
3.1
0.7
.,
V
I/See.
L T SumT
Ft. Min.
14.2
13.2
Calculated by MB
Date:27 August 03
Remarks
Appendix X-A
Sheet Flow Across P.L.
Appendix X-A
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
AUG-28-2003 04:51 PM LYNN
Winston H. Hickox
&l:NtaryJ-
wift:»l1Mlflal
Prr;Mctlon
State Water Resources Control Board
Division of Water Quanty
10011 Stleet. Sacl1D1~\ltO, Calltbmia 951114 -(916) 341-5536
Mailing Addm.: P.O. Box 1977' Sacramemo, California' 95112.1977
PAX (916) 341-5543' IntemttAddres!I: http!/twww.swrcb.(:a..goY
Friday, August 15,2003
Bill Lynn
Lynn, Bill
6575 Black Rail Rd
carlsbad, CA 92009-2602
RECEIPT OF YOUR NOTICE OF INTENT
P.0l
Grayll.vis
Gawtillor
The State Water Resources Control Board (State Water Board) hIlS received and ~es ... ed your NdTICF. OF
INTENT TO COMPLY WITH TIlE TERMS OF THE GENERAL PERMIT TO J)lSCHAROESTORM WATER
ASSQCIA'IDn WITH CONSTRUCTION ACTIVITY. Acc(lrdingly, you are required to comply with the permit
requirements.
The WDlD identification number is: 9 37C32307~.
Ple<Jsc use this numbc1' in any future communicatiqns regarding this permit.
SITE DESCRIPTION
OWNER: Lynn, Bill
DEVELOPER: Lynn, Bill
COUNTY: SAN DIEQO
SITE ADDRESS:f:iS75 Black Rail Rei
Carlsbad, CA 92009-
COMMENCEMENT DATE: 9/15103
EST. COMPLETION DATE: 1/1104
When construction is. complete or ownershlp has been transf~d, di$Chargers are required tQ notify the Regional
Water Board by submitting a Notice ofTermirurtion (NOT). All State and Joca'i rcquiremen13 ~ust be met in
accordance: with Special Provision No. 7 or Ihe Oenernl Permit. I have enclosed a NOT for your future use. If yOu
do not notify the State Water Hoard tha[ construction activity ha.'1 ~en completed you will continue to be invoiced
for the annual fee each Octoher.
If you have any questions regarding permit requirements. please contact your Regional Water Board a~
(858) 467-2952, Please visit the storm water web page at www.sW('I;b.ta.gov!stonnwtr/index.html to obta~ stann
water related lJ'lfonnation and funns.
Sincerely,
Storm Water S.:ction
Division ofWmer Quality
CalifornUz Environ~ntaJ Protection Agency
Q R#~kd Papel'
10
I
I
I
I
I
I
I
I
I
·1
I
I
I
I
I
I
I
I
Winston H. Hickox
&cntary jM
&fyil'OlUMlflal
Prof«rlon
State Water Resources Control Board
Division of Water QuaHty
10011 Stteet. Sacramenw, California 951114· (916) 341·5536
Malling Add~: P.O. Box 1977' SICns:nertW, California' 95&12.1977
PAX (916) ~14S543' Illtemtt Address: http:(twww,nmb.~a..gov
Friday, August 15,2003
Bill Lynn
Lynn, Bill
6575 Black Rail Rd
carlsbad, CA 92009-2602
RECEIPT OF YOUR NOTICE OF INTENT
GrayOavls
GcwIriior
The State Water Resources Control Board (Stale Water Board) hos received and proces.c;ed your NOTICE OF
INTENT TO COMPLY WITH TIIE TERMS OF THE GENERAL PERMIT TO DISCHARGE STORM WATER
ASSQC1ATI3D WITH CONSTRUCTION ACTIVITY. Acc(lmingly, you are required to comply with the permit
~ulrements.
The WDm identification nwnber is: 2 37C31307S.
Please use this T1urnbcr in any future communications regarding this permit.
SITE DESCRIPTION
OWNER: Lynn. Bill
DEVELOPE1l:Lynn, Bill
COUNTY: SAN DIEGO
SITE ADDRESS: 6575 Black Rall Rd
Carlsbad. CA 92009·
COMMENCEMENT DATE: 9/J5103
EST. COMPLETION DATE: 111104
When construction is. complete or ownership has been transfc;rred, cn~h~rgers are reql1i~to notify the Regionsl
Water Board by !)ubmitting a Notice ofTennination (NOT). All State and.Jcx:a'1 requirements Itlust be met in
accordance with Special Provislon No. 7 or the General Permit, I have enclosed a NOT for your future use. if you "
do not notii}' the State Water Board that construction activity has been completed you will continue"to be invoiced
for the annual fee each October.
If you have any questions regarding permit ~quirements, please contact your Regional Water Board at
(8S8) 467-2952. Please visit the stoml warerweb page at www.swrcb.ca.gov/stoImwtr/index.html to ob~irt stonn
water related infonnation arid forms,
Sincerely,
Storm WAter Sectioo
Division ofWaler Quality
California Environmental Protection Agency
Q Rlcyckd PQIMr
If
-------,--~---~------",'"'' -.' ."-...,--",'"''
:~\t , ,", .
, ;;... ... ,. I ErlClnltaS>' I • • / ~. , •• : .. ,'. ~, I I
,/'" . I(j) \~ ,;. ,m,
or-
,~
. .
"san ":' Oiego County~:C~I:ifornia
\ . III,.. •.
\
-.
.~
~ :1
:1
'-....,./.
I
I
I
I
I
I
I
I~
I
I
I
I
I
I
'·1
I
I
~.
RUNOFF COEFFICIENTS (RATIONAL METHOD)
DEVELOEED AREAS {URBANI
Coeffici~nt, C
Soil Group lil
Land U§e A 8 C D
Residential:
Single Family .40 .45 .50 .55
Multi-Units .45 .50 .60 .70
Mobile Homes .45 .50 .55 .65
Rural (lots greater than 1/2 acre) .30 .35 .40 .45
Commercial {21
80% Impervious .70 .75 .80 .85
Industrial (2)
90% Impervious .80 .85 .90 :95
NOTES:
(11 Soil Group maps are availa.ble .at the offices of the Department of Public Works.
12) Where actual conditions deviate significantly from the tabulated imperviousness
values.of 80% or 90%, the values given for coefficient C, may be revised by
multiplying 80% or 90% 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 0 soil grpup.
Actual imperviousness = 50%
Tabulated imperviousness = 80%
Revised C = 50 x 0.85 = 0.53
80
APPENDIX IX
Ilnrl:4tM ~/Q~
/1
• I
·r
I
I
I
I
I
I
.1
Ir
I
I
I
I
I
I
I",
I·
I
EGLI/ITION
7i: -E"-tL Jj . .385
7C = HAM 0/ ~on&4n.f...-zzT"M
L a Len9#J 0; wrz.f~r$/Md
H· PiH&Y't!!HCe ~b J~ ... :t1n a/cng
dl'~R sJq~/i'n~ (~~~¥-B)7:.
L 't:
/0
5
H L
SAN DIEGO COUNTY
DEPARTMENT OF SPECIAL DISTRICT SERVICES
DE SIGN MANUAL
APPROVED ,3./1:' .11j'~~
" ..21tt1 ... 4~1J
"' JIJIJIJ "-
"-
.3:.,... -J--/BIJ
2,"-, -J--I2D
1110
~I)
eo
70
. 1---,1--:-Gt)
"' "',
SI)
.40
31J
2tJ
/8
IG
/~
/2
·5
NOMOGRAPH FOR DETERMINATION
OF TIME OF c,oNCENTRATION ,(Tc) .
F~ NATURAL WATERSHEDS
~TE /Z./J /69 ' APPENDIX X-A
V..,A-IO·· Rev. 5/81 /'1
I
'I
I
I
I
I
I
I
I
I
'I~~'
I
I,
I
I
I
I
I
I
I
LlRBA'A/ A'RE~S tJVERL/l/V£) TIME t/F FLIJW CURVES
i ..... ,
-~
. ",,--' -~ ..
--/44
E~ah7p/e:
C'/v~n : L ~n!7/h mP Row • .3't/tJ f'r.
S/ope : /. tJ %
Coe///;:'ie/lT 0/ Runol''p'' e ".50
Rea.d: tJY~I"/4'hc:/ /H;w//m~ ~/.9 N/nuT~.s
SAN DIEGO COUNTY
OEPARTMENT OF SPECIAL DISTRICT SERVICES
DE SIGN MANUAL
APPROVED ,.-)'/ -/ :;:('/ L .-l,. L«.fl~---DATE
; ...
CII
1·· ...... LL
1 •• 1J
'"
I' -1:_
URBAN AREAS OVE~LANO TIME
OF FLOW CURVES
'APPENOIX X -C
ill
I
I
I
I
I
I
I
I
I
,--",'
,.,I~,
I
I
I
I
I
I
I
I
I
2% ~-'. _..,·~ ____ n:.~ --~l!1-_---J ~I -:L= 2% .. .. .
.......... . OJ3 RESlOEHTlAL STREET --------'-'lt~ ONE SIDE ONLY
w
14 12-1,
10
9
8
7
6
Co 4 9 en
... 3 w w a: t;
lL. o
~ J.8 o .
0;4
2 3 45678910
DISCHARGE (C F. S.)
EXAMPLE:
Glven l 0.= 10 S = 2.5 %
Chart --.: Depth = 0.4, VeJoc;ity = 4.4 f.p.s.
20 30 40 50
SAN DIEGO COUNTY
DEPARTMENT OF SPECIAL DISTRICT SEfMCES
GUTTER AND RQADWAY
DISCHARGE -VELOcITY CHART
DESI~ .
. APPROVED 4A6~
! .
'. ----------~------. .INTENSrTY-OUMT1. :.·'·DtSIGN CHART - -. . ".
':'J.~ 1.-I:_L:.l:.I:.I"J:I· ............ ..
l·_~m~IIII~lfl.Emif __ l.o
-< ... 1--1 ..... 1.-.-1-1-.... -I"-t-t-r.-H-····-··· .
--l 1111I-+-I-t-t-H+I-I-H-H·l.I.I.'-U,
E.l r-rrrTlfITllllllttrlll'ttlIIIIIIIOqIWllIIlIlIl.lIl,'!"'I1 I 1.1 I I' 1111.'"/'1'111'11111
~ 10 15 2 3 4 5· 6 20 40 50 1··; 30
--I M; nlltp.~ "-. Hours
Directions for Application: .
1) From precipitation maps detennine 6 hr. and
24 hr. amounts for the selected frequency.
These maps are printed in the County Hydrol,
Manual (la, 50 nnd 100 yr. maps included in
Design and Procedure Manual).
2) Adjust 6 hr. precipitation (if necessary) 51
that it is within the range of 45% to 65% o'
the 24 hr. precipitation. (Not nrrlicable
to Desert) . ,
3) Pl~t 6 hr. precipitation on the r;nht zide
of the chart.
4) Dra\,1 a line through the point parallel to tl
plotted lines .
. 5)
2)
3)
4}
(.eZ %*
Adjusted *p 6=--.·Z. e
t • c min.
I • in/hr. . ~----------------
*Not Applicable to Desert Region
APPENDIX XI
IV-A-14
Revised 1/85
- - --. _. --. - --' - - - - - - - --( 'rHTENSITY"DUMt'<~14 D~SIGN' CHART (
....
to. ~~ .~. ~ ~ rmhlOnml· il=%*ilU ill Ii i! IiUlllllillnin*i .. , ,,(, 't'1lo'IU.t.,IlOfM;u,l,nhn I ..
....... i?I':r.; ,I' ' ".: Equation' I. 144 P D -.645 : .. ; a. """ I.~ I: : ~ l': " • • .' • 6 I"';'! It: -,.. .... , ... . .:. ,-, II!! i.. '-:II • " • : !
"'.... "'" •• 0 "-", • .1'''" . II, .. .. , . :. , I .• Intensi ty Un ./Hr • ) ,.I,",\~ , :.._ ., " . W;;~~~~~. " . P6 • 6 Hr. Procipitation (I·n.) s. .. ~. '. , .
~~~ :~~ :~~I . :.' D • Duration (Nin.) • lit.... ... ~ .~ .' • ~ , ,
f I.......... ..~1IIr.. • 1~:1. •. :": ",1 ~!. 'f • 'I' . ."iiI;' .• Ij
"'->111l1li..:'-' o· " " I' o·
-• ~~. "-~ ~ -:. • I I ~ •• ... ;:~ ... ~: ~ ~~ ', •• ~ • 0 0, I' . .:~ .: ~ I:': i "i.!I~'\.;j·\.I.rof.ll~Hmll1l1
I • I., ~ . I • • _. ~. •.• .. I, ,
"l1oO. ~~.. ".. o. • • , • • :::--. I~ ~ ~ .. ~I~!l' .: ~,I;~tlJ:·tJ: 'Ui '11111111'1111 .f :.;-. I l~"" .. • • •• •• • -_~ I-C. ~' • ••• , IlffJI ...... i ...... ' ••••• , .-.1-...... -.. .",..:. ~~!:;. .. ... ~ I o. o. • ••• "1-' .~-l 0\ I •• ... •. • ... ' '... ~ o.!" -" ,. 1"'1-1 . • ,._ ..... ~ •• , t' ~ I. ! .......... t I. • •• ~ ••• ~ .,. , • , "I ~. ~ ,., If It.f .. • ... , .. , .. , '~-io' . ., . I ~. ~110..~ .. , •••
•• •• MO' -......... , , , • "''' •• J .. ,.'iIII ":~""'I'"",,,,","
... : H. • ... ,...' ,. • • • 0 "': i"I~ -~ -. • " ... ~.. .. •• ., . I .il' ~I" ~ . ,
-.... ~... , ] ~ '''~I-"'~.
.-.. I~~ ....... , ." ". "'I~ ,~
-.. 1-'. ~ '" ., • . , : .. i' ~ 0 "-110.. i"I ~
1
-· ." . ro-' . . • ~~. '",1""1'1 ~~
• " . "..... ~1111 I'.~
4 '1'-:-1-1-'" " :' ., .' nUl '-~~!-'" 'i'ii" .
I .-....... "... ..,. ~um.'·· ~., ~~.~'t>i"'~ .~
...' .. iii "t'-I---_.. ., . ...1! • r-:.. r~ to-" , II. ' ,: \ ... '~I''-• " • I , ". ~, •• • '":" I ...
: • ": 0 • • ',:: rUlnr ..' '.,." I~ ',. ~'t : • II •••• II • ~ .. ~, ...... , ... I • I • t • • • I -:.' , • • ••• , •• I, I • • , , ....
... 'f •• :. "!" f·.· I • • .f , I.~ .. ~ 't ~ $J .e. ... • • of I • I " I " ....... t •• ~.! .
I • • ..,.. • .. I I "'!~ • ~. • ~ • .
III~~ < 'I... I " ~_~"I .... ' ...
! I • '. t.. . .•. . ,t.· • I • f-h ... 11'1'1 ... .1 -• I~' " .. -• • to I • • ".~ ........ I"""'III! ..... ' It." •• I. I.. I,' ' • .......... .~.
• ••• '" ••• I I " , • j'::" to 'I. I.. .. . ". I II I. .... II ... .•• • " >,.. • . .. .• I • • I ~. -'.t •.•. l·.:r: "" I ,. I.. •• • •• • •• ~. 1 .... 1 1IiI" ~:,~ .. : .. J, 'I': ,.f • 41. I ..... :-= ... ,.= ...... 0 , •• I" . c!: ....... .f ... ,. I • f • r='
, .,....."-.. .. '., .. -[;'"
~.. " . . :.!!.J ..... I.~. I • . ~;~~E .. . -_.
,-
Pill f , "t7
~ .J.
"0 .J. " -:11' ,...
I • 6 0 ~ .' '.. t1' · I's c· " O::s • I. • 4.5 ........ ,4.0 S·
3.5 a-
'3' 0 ~ r· ..;.,
1~~6
1.6
11.0
I-J-J:t:I~-t:U:f .J.l.tUU.tllil tHltHlH:t.t.tl:l1ffimtttl . . 1-M#t,~Ul
o 15 20' 30 40 .50 1 2 3 45 6
"-..> ...
Direction. for Appli'cation':
o
1). From precipitation maps determine 6 hr. ani 24 hr. amounts for the selected· frequency.
The'se maps are printed in the County Hydro' Manual (10. GO and 100 yr. maps included 11
Design and Procedure Manual).
2) Adjust 6 hr. precipitation (if necessary) ! tha tit 1 s wi thil' the range of 45% to 65% ( the 24 hr. precipitation. (Hot n~rlicab'e
to Desert) .
3) Plot 6 hr. precipitation on the r1Dht side
of the chart. .
4) Draw a lin. through the point parallel to 1 plotted 11nes. .
5) This line is the intensity-duration curve 1 the location being analyzed •
Application Form:
. 0) Selected Frequency /D )Jr •
1 ) p 6 • ,I. e 1 n.. P 24. '3. I • \It P 6 • ,5' 8 %*
·1S24 2) Adjusted *P6-1. eN _. __ . __ ~_ in.
t • c ____ """")11n.
•
... _ .. ---.. ----------lNTENSITY"DuRrJ •. v'i D£SIGN CHART -.. ---
"'-
(
JD .. """~ .~.. •••• Irmirmnrul'I.I4.llllf I I Ii I iliIIliilllill1'ir-1 ., ,·''I'lI.·i!l.I·.u::r·H.I,IlS chn i ..
o •. r..:. ~~~r; . i:: . '.' ·:H Equation: I'. 7.44 P D -.645' j 8. ~~. _,.. ••• .•. ~ 6 ~l~~"~ •.•• •
1. ~.' ..... '.~ ~: .. '~ '.; e.-~~~~ '~~'~~., . ~ .' . I~ P6. 6 Hr. Precipitation (In.)
50 .. ,,". ~ .!... .' . I '.
""1'" ~. I " '.. ~:, ... :.N.. . :,'" D • Duration (Min.) m· ~ U:· I" 'Ii", .. 4. ·T .. • ..... ,;, I'" .. ", ... -. .1 ~'I"T! ... , .. ,~ I . . ..... ...... ..... , '1 'I'''i~:':~ I. f '. , . I III I '#::~::::fo':~~~·' . -~I; .... ' . I ftII , .;. ~.. .' ~'. I.~. .~F-~ •. ::.: . ;' ..... Ht ,. '. ~. '. '" . ,-...... ,. . . hr ~ ... ""'~... I ......... -•. ,., .. . .... ~ . ~ .... : '~. '... •• -t-• to-... . ...... ,.,. •. ,.. ..., ... •• . .. _. ".1-. _.. .... .• . . . .. ~ ~ . . . . ·1· , I I 1._I::r,.-r-. -'1-... • ••. ,: "
I • Intensity (In./Hr.)
r... •. :',::,:~:. ~~.:.'" " .. I .. .• I--t-··_ .. f·· ' ...... . ~;,.. . .. . . ......... ' .. rt "" I' J • ~ •• --._ ••• ~ 1-' . •• • . ,:, 111:.111 0'\ •• , ......... f" • ' .... r II "-1--..... ,. •• -., ,. I.:. I
..... 10.... • ..... , ..... r~~'''' /.1 I. . . Its.::·'--. .•...•.. .. I, ,.1 !:r: I ,..... . ..... . ••. ". •. . 1 I " • , ~ I'" .......... - . "'j': ' , I.' , 0
,.. ;"IIi~.:. f'i-I~ • <c. '. ..' • ',/ ~ , .... ~. ·1' -. "'1r . 'IT':I~' c •• M~ •• f~ -... •. • • . . ,., ,.... .~. • .. • • • "'S ~-.. "'k. .... !to-"" . • . 'I .. . . ~~"'" -"I'~" ... ,,' " Ii, ....... '1'1~. . , .... "'· ..... N "" ' , .. n. ,II ~ -10...-.. •. .. . ~ .. 'll I"-; .. r-.I-'~..:: "'. " i-f~' .., .. r.-" .. ·1-·' . .. . ". -I'~' ." II ~
-1-.. I'-"" ...' .. . ~ I .... ~~"'I"io.l~r-."" ~ . . ~ '1.111 oJ •
• 1. ••• • 1-0.... . ,. . I . , .... """ .~.... to--..~'. J I I "0 .... ' I 110.... ,.... I"" I"';~ :~~ II oJ, . II.... ,[, ~r.. . j I' 'J~ ~ I' r+ ·"]~~·l··· .. ' .. '1" .\ ... ~~ ~~ ~ , '~'rr.tor'I~' '~l:~r;6.0 ~ ~ ._ ........ " ~. "i' .. ~ ~ .. :... II~~~~~.~~~""~~ ' .. K; , '::',: ·s.S t
.. ":".. . . ...,.. J ~ .... ~ r'li l-~.ro. . ~ .,.... '/ 5. 0 ::s ".: " . . • .' ~ '.; ,~~"" ~'ho' I 4 5 _ . . '.:: . . '.' ... '.r:'~~:', . ·tor ~!I '4'0 tool, I','· . • • .. ... ..~ ~. ••• • 1'~I.::s
I • : .~ ., •• • • • •••• ';:: ;. I.... ~.. .', f' n --:'" .. ,,', ............ . Ir 3,5::r _ .•.• ,. ~...,. •. •• - -,I". •
• • ••• .......... .. • • ~1Io. ..... "~ "'~ co • . •. , ., • • • . ... , .... ~ '~... • • • I 3 0 VI -:-~ .. • •• , " '.' ' .' fIII& ;,M •• -••••• ;. • • III r l' -••• " ••••• :.... • • • L,.;;::! .. I_I~ ..... .. ." -'. ..... -....... " . • .. •• I~ • • ~ .' • • .. . .
I·· .. · "::.: :: ~'. :':.::.' ....... ~~:ts.~ .. ~~ n •• '. • '2_5 1 .. .. ... . " ... ..... .... ~ ";~t: •.. ..• .. ' ~ ~ :,' I,: ~ ~ : .' :' .,' . : '. '. • ~'". . I ~ ".1.-:-.':. 'I~ -.;'. I' ," ' :: ' I~-, .. ~; .. ... .. . . ... , .. . . , . . . 1:':"... "",. -• • • , ., ~~2 0 r~~ ;:: :::::. :: :: 2J= : .• ". '. >. , : :;: . I .' • • I'.:J': IZ ~ ; _ •..• : & '. :' • < I; t:I ill'
l~ '-1-_. _ .. -• . . • ... • ~ .• . • -'~I-"" .~~. '.,. "1-1-' L~"'. " _ ...... __ 10 I • I t--..... -.. a;" Of' '.
,_ _ .. ~. .. II _. f ••• , •• •• ! • ._ , ... .,. " ;. ..
" ' ... '" -: • Il ., , . . -, ;. , :
I-i-• ..•.•. • . -.. .... I •• 1'-1--'.. • • .' H ; • , . !HUll! . .
<1_-
;;r=+ :,'1'1'" H-H±t:liL.r.N..III~
It' .. 1 11+11 H 1111 -,; .
1.5
~ I.~
, . LII"NtIIl· .
I-H-I I I / I 1+++++HHHHlfHHIII+I+HHH+HHIHHIHHIIIHII 1,=111111 H:ltHttiUIHftHl.0
... " .... I-f-I-f-~.j-+l·,· ............ ·•· -I I I .I H-f4++-1+1 ,If"l' •.
1--1-+",:1+ H-J.4.I-I.J.f-l4+J:1#1 tf~IIIIW+1111 J 11111 ~tU+ttttf )1, I II I I I-H-H~
1-I-+4-H-++~I+~+H"
o 15 20 30 40 .50 1 2 3 4" 5 6
1.4 .. ., ..... ",., u ............
(
Directions for Appl1'cation:
1>.. From precipitation r.1aps determine 6 hr. an(
24 hr. amounts for the se 1 ec.ted . frequenc~/. The'se maps are pri nted 1 n the County Hydro 1
Manual {lOt 50 and 100 yr. maps included ir
Desi gn and Procedure Hanu'al ).
2) Adjust 6 hr. precipitation (if necessary) s that it is within the range of 45% to 65% c
the 24 hr. precipitation. (Not nppl1cable
to Desert) .
3) P10t 6 hr. precipitation on the rioht side of the chart.
4) Draw a line through the point parallel to t plotted lines.
5) This line is the intensity-duration curve f
the location being ana1yzed.
Appl1c~tion Form:
'0) S'elected Frequency ? yr.
1) P6· 1.~a;,1n .. P2411 '2-.0 • *Ps· -'e.!:2%*
P24 2) Adj usted *p 6-,. ~ i'n •
3) tc· min.
,4) l· .in/hr.
*Not Appl1cab1e to Desert Region
-J'
:)
• lid i -------------------( (. , '(
COUNTY OF SAN DIEGO
DEPARTMENT OF SANITATION &
FLOOD CONTROL
10-YEAR 6-HOUR PRECIPITATUm
45 '
30' I 'I . \ ' 'I: c ,
1 5 I I I"' '\ L.i
33 0
1 45 t .L.I--~r---I---:-,~. .-.. -~ .. ---.... ---. '--.~.. ,-
PrtPII,td b)'
u.s, OEPARTMErh OF COMMERCE
NATIONAL OCEANIC "'~D ... ,l:oSIJIIEIUC ADMINISTRATION
SPECIAl.'STtl,b/E5 DRA:-tCII, OFFICE OF !lYOROLOO'i, NATIONAL W£ATHl!:R SltRVlC!
30' . "I . /' '. I
1180 45'; 3D' . 15'
., .
f, .
.117 D 45' 30' 15 ' 116-
--.--------------1 . COul'lTY OF SAN OtEGO. ,
J"
DEPARTMENT OF SANITATION So
FLOOD CONTROL lO-YEAR 24-JiOU;R PRECIPITATION,
'-20../ ISOPLUVIALS OF 1'0· YEAR 24-HOUR
30' . I 1'< +-\---llI;"
15' ,.,1---:--+----1
33°
45 t I ~
Pr.p.jrrd by '1
" NATIONAL OCEANIC AND ATI,IOt\l'IIlttuc APMINi!lTRATION I
SPECIAL STUDIES DRAse". OllFle!; 01' d\~OI~QLOOV. NATIONAL W£A'tUER aEI'tYrC! I
U.S. DEPARTMENT OF COMMERCE
1-4 .... I =r '\:,
30"~.I:' :-'--1~-~-+--~
118° 45' 30' 15' ---o
i 17° 1'5' 30' IS'
- --* J
1160
----,-----)
COUNTY OF SAN DIEGO ,
DEPARTMENT OF SANITATION ,
FLOOD CONTROL
45' \'WI)~"_7 "n , '),~'
30' I 't
IS' I I '\ /---;tt
33°'
45'
P,.p~~d by
U,S. DEPART~1ENT OF COMMERCE
NATIONAl., OCEANIC AND ATMOSPHERIC AOIiIlNIITRATJQN
"ECIAL STUDIE~ ,BRANC!t~ OFFICE Of' lI'I'nIlOI.OO'\', NATIONAL W~ATH!R SlRVlCI
\l
Y'
30'
1180 1.5 1 30' 15'
---------.,
I 45' 3.0' 11 t 15' J 16·
"
. :
------
\ -'
'.
')
" '
COUNTY OF SAN DI.EGO .
DEPARTMENT OF SANITATION So
FLOOD CONTROL
\ .. '
't 33·'
45'
30'
1St
45'
I,
Pr.pa',.d by
J
U.S. DEPARTMENT OF COMMERCE
N ... TION ... L OCF. ... ~IC AND "'T~IO!U)ltnIC ADMINISTRATION
~PI!:CIAl. STUDIU BRANCH','O"'ICE OF I(VOROLOOY. I'! ... TIONAL lI'JtATHf:JIt SltltVlCI
. 'I +-I I
1-4' ..... .1 ';t> . ,\ (pI'-'
\r.J
30'
1180 1.5 f 30'
-- ---J
, '
1:5' t t 70 45' 30' IS' 1160
I
I
-------.~----------------------------------------------... -------------------CO~~IY OF SAN DIEGO
DEPARTHENT ·OF SANITATION &
FLOOD CONTROL
45'
. I
15' ~ I ~
33°
.,--
45~ I I . I
-~ ..... --...... -. ........ . _-.-
'P'~p'lIf"d by
u.s. DEPARn!ENi1' OF COMMERCE:
NATIO:-lAL OCI;A/l:IC AND,I\T, OSPIIIl:IIIC ADMI:IIISTRATION'
SPECIAL STUDIES DRI\NCH. OFFICI! OF II UROLOGY'. NAT/ONAL WEATHER SERVJCt
30i '1 .LV' 4U(U'''''''',)\
~J
--:;;
Its ' 45' 30' IS' Itt l.5 ' 30' 15' J lGo-
- - - - --, - - - - - - - - - - ---COUNTY OF SAN DIEGO
DEPARTMENT OF SANITATION &
FLOOO CONTROL
115 '
3D'
'. I' . 100-VEAfl 24-lrlOl rt rnECIPITATIO~l
r20JISOPLUVIAlS Of 100 -YEAR 24-UOUR
PRECIPITATION m hrHIlS OF AtJ INCII
IS' r-11----~-----4,-----------
,33 0
~ \V
1-1-
45'
p'C,,"f',j by
u.s, DEPARTMENlr OF COMMERCE
NATlON,H,OCEA:-;'C AND A""~()~"II,"»IC "'l)~IIN'~"rRATION
".CIAL nVD,,, "","CII·
3
:,"C< OY ~DUOL"OY' 'ATI~AL ',""II'. ,;o .. c£ . I
H .,..
" , III'" /"" )0' ) .. N I 1;.1 "
f . /,\ W '
I'i' 1170 I, ~i I )0' 1 :. ' I 1 Oil
t-
PRE-DEVELOPMENT CONDITION
+
POST-DEVELOPMENT CONDITION
==:::=~::;=:::::~::::::::::::;;;;::::::::::;::::::;::::=:=:; ------------,---------------
LANE
. --1------.L _ +--___ , ----;------- - _ __ 148+00 149+00
----------------------I ----~:~~':rEX;~!
010 = 1.1 CFS ~\,\ 0/00= 1.8 CFS
9
12,900 SF
PLAN 2c
OJ r-
~
C") ::>:;
~ -r-
:::0
I 0 ~
I:)
10 00
--+:-----
150+00
[fJ
h:' -~ S
>2 --' "l 0.::
"" '-lti ~Lr, v-,'D 'D ,,~ -'" --''D "l"" 0.::,), SCALE 1"=40' ac'" ~~ ,-,,*, as I.j ~i'S ~fG lljo::
Lr, 'D '" '" g ,
"" '" '" * G '" C)
ll'i 0.::
h
iD aJ Vi
tD g:
G c5
~
Engineering
Professional Civil En!!ineers and Land S urvryors
600 South Andn:a5~1l Drive, Suite E, Escondido, CA 92029
Phone 760 741-3577 FAX 760 897-2165 E-Mail: MLBenesh@pAcbell.net
TENTA TlVE MAP CT 03-
HYDROLOGY MAP -Q/O/Q/OO