HomeMy WebLinkAboutCT 00-13; TABATA PROPERTY; HYDROLOGY STUDY; 2013-06-30HYDROLOGY STUDY
FOR
TABATA PROPERTY TENTATIVE MAP
JOB NO. 00-1003
JUNE 30, 2000
BY O'DAY CONSULTANTS
5900 PASTEUR CT. SUITE 100
CARLSBAD, CALIFORNIA 92008
TIM CARROLL
PROJECT MANAGER
Existing Site Description
The project site is located easterly of and adjoining Black Rail Road
approximately 1400' southerly of Poinsettia Lane. The entire site consists of
approximately 5 acres, which was used for agriculture.
The natural drainage pattem of the site to be developed is split with
approximately 4 acres draining west toward Black Rail Road and the remaining area
draining to a brow ditch to the east.
Proposed Project
There are 17 single family residential homes proposed on the site. The westerly
12 of the 17 lots will drain to one of the two proposed cul-de-sac streets and be
transported to Black Rail Road by gutter. The easterly five lots will drain to the cul-de-
sac street and then be transported east by a brow ditch located in the southeast comer of
the site. This brow ditch will connect to the existing brow ditch running adjacent to
Cabela Place in the Aviara property.
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01.' r. c.«
RUNOFF COEFFICIENTS CRATIONAL METHOD)
I?
LAND USE Coe f ficient. C
-So il Group (1)
Undeveloped
Residential:
A
.50 . 35
C
.40
D
.45
.Rural .50 . 35 .40 . -iS
Single Family .40 .43 .50^ V,;,_55
Multi-Units .45 .50 .60 . 70
-Mobile Homes (2) .45 .30 .53 . 63
Commercial (2)
80% Impervious
.70 .75 .80 .33
Industrial (2)
90-» Impervious
.80 .85 .90 .95
-WES;
(1) Obtain soil group, from maps on file with the Department of Sanitation
and Flood Control.
(2) 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: Considei
commercial property on D soil group.
Actual imperviousness =50%
Tabulated imperviousness = 30%
Revised C = |0 X 0.85 = 0.53
.\PPE.NDI.X :.\
RESIOeNTIAL STREET
ONE SIDE ONUY
EXAMPLE:
"r-T~T'X[ r
5 6 7 a 9 10
DISCHARGE (CFS.)
1
20 30 40 50
Given > C.= 10 3=^5%
Chart giw: Depth = a4, Velocity = 4.4 f.p.s.
SAN OIEGO cou^f^r
DEPARTMENT CF SPECIAL DISTRICT SERVICES
DESIGN MAMUAL
APPROVED /i.iJi/if^yy^'^^^rt^
GUTTER AND ROADWAY
DISCHARGE-VELOCITY CHART
DATE _Z2/3£4j. APPENDIX X-0
l_6(LI-c)rD_
SAN OIEGO COUNTY
DEPARTMENT OF SPECIAL DISTRICT SERVICES
DESIGN MANUAL
URBAN AREAS OVERLAND TIME
OF FLOW CURVES
DATE APPENDIX X-C
INTENSITV-DUMTION DtSIGN CHART
Tininiir=i-ri » i i.iu.illiMiniihni
7.44 D
15 20 30 10 50 1
Minutes
2 . 3
Hours
Directions for Application: ,
1) From precipitation naps determine 6 hr. and
24 hr. amounts for the selected frequency.
These maps are printed In the County Hydrolofiy
Manual (10, 50 and 100 yr. maps Included in th
Design and Procedure Manual).
?.) Adjust 6 hr. precipitation (If necessary) so
that It Is within the ranfle of 45X to 65?; of
the 24 hr. precipitation. (Not npplicahle
to Desert)
3) Plot 6 hr. precipitation on the ribht side
of the chart.
4) Draw a line through the point parallel to the
plotted lines.
5) This line is the Intensity-duration curve for
the location being analyzed.
Application Form:
0) Selected Frequency /OO yr.
1) Ps - aA_in., P24- S.o . "
2) Adjusted *Pg«
3) t.
24
in.
JO min.
4) I In/hr.
*Not Applicable to Desert Region
APPHNniX XI
IV-A-14
Revised 1/8.S
COUNTY OF SAN DIEGO
DEPARTMENT OF SANITATION 5-
FLOOD CONTftOL
33"
'•5'
30«
15'
fur"
U.S. DtPARTMtN
NATIONAL OCI;AMC AMD AT:.
SPtCIAL HUUItS UKANCII. OH ICK Of 11
30'
lOO-YEAR 24-HOl (I PRECIPITATION
-20^ISOPLUVIALS OF 100 -YEAR 24-liOUn
PnECIPITATIOIl IM EMTIIS OF AM IMCII
'<i tor
r OF COMMERCE
U^tl-llCHIC AUMIKUrilATION
UliOUOGY, NATIONAL WtATIIER SEWVICE
iiir /I'j' .10' II' 117' .10' 116-
"liy ISOPLUVIALS
PnECiFlTATIOn IM
OF 100-YEAn 6-HOUR
rEMTliS or AM liiCII
33*
U.S. DEPARTMEN
NATIO.NAL OCEANIC AND ATrjoSI'IIEItlC ADkilNISTKATION
f PECIAL (TUDieS URANCH, omCC OF II
30' _
zo
i .saaa
.4aaa
.Zaaa
j\ .Jas
-)
£Qa/?r/OA/
Te * 77/7re a/ eoncen/ra/forr
// * Di/fere/tes m ff/ffva/za/r a/an^
e/feef/re s/aoa /ine (See Appendix 1'8) -r
L ^
/O —
./aaa
8oa
700
'SOO
•40O
.300
.200
•/oo
4-
J-
2-
\
\ -
\
/^ 'Saoo
-\—4<^o
-\-~J0O0
•so
¥0
.JO
za
as—
NOTE
jFOR NATURAL WATERSHEDS]
J AOO TEN MINUTES TO \
I COMPUTED TIME OF CON- \
\ CENTRATION- J
/O
\
2000
/SOO
— /600
— /4fao
— /200
. /ooo
900
— aoo
— TOO
— SOO
-SOO
— f(30
— 100
200
\
/BO
/2a
./oo
'30
.80
. 70
^eo
so
— 40
— sa
-20
/o
./6
./4
\-/2
- /o
9
a
7
— 4
— J
H
SAN DIEGO COUNTY
DEPARTMENT OF SPECIAL DISTRICT SERVICES
APPROVED
DESIGN MANUAL
'0. //. /i4-'^-A~^ <lJLAy^
NOMOGRAPH FOR DETERMINATTON
QF TIME OF CONCENTRATION (Tc)
FOR NATURAL WATERSHEDS
DATE /^A/^? APPENDIX X-A
—————— , n_.. c/01
Averig* V<luc> of Roughntil Cocfflclenc (Hannlng'f n)
H I
ro
?
r
Type of W»terv<«y
1. Closed Conduits^')
Steel (not lined)
. Cast Iron
Corrugated Hetil (not lined)
Corrugated Metal(') (smooch asphalt quarccrlIning)
Corrugated Hetal'^' (smooch asphalt half lining)
Corrugiced HeCal (smooth asphalt full lining)
Concrete
Clay (sewer)
Asbestos Cement
Drain Tile (terra cotta)
2. Open ChannetiC)
Unlined
Clay Loam
Sand
Revettsd
Gravel
Rock
Pipe and Wi re
Sacked Concrete
b.
Lined
Concrete (poured)
Ai r Blown hlotarlS)
Asphdicic Concrete ur Bituminous Plane
Vegetated (small channel, shallow depths)
Berir.uda, Kentucky Bluejrass, Buffalo
Mowed CO 2 in.
Length l< - 6 i n.
Good stand a.iy grass
Length 12 in. t
Length 211 in. +
Falr stand any grass
Length 12 in. +
Length 2't In. T
]. Pavement and Cutters (')
Concrete
Bituminous (plant-mixed)
Roughness
Coefficient (n)
0.015
O.OIS
O.OJit
0.021
0.016
O.OIZ
O.OIZ
0.013
O.OII
O.OIS
023
.020
0.030
O.OliO
O.OIS
0.02S
0.0|l<
0.016
0.018
0.050
0.060
0.120
0.200
100
170
CIS
016
Type of Waterway
it. Depressed Hadlant (10:1 slopesC)
Earth (without growth)
Earth (with growth)
Gravel
t
S.- Natural StreamsC*)
.t, HInor icroam (lurfac* width at flood itagi < 100 fc)
(1) Fairly regular section
(a) Sone grass and weeds, llttia or no brush
(b) Dense growth of weeds, depth of flow
•laterlilly greater than weed height
(c) Some weeds, light brush on banks
' (d) Som* weeds, heavy brush on banks
(e) For trees within channel with brtnchet
submerged ac high stage. Increase all
above values by 0.015
(2) Irregular section, with pools, slight channel
meander
Channels (a) to (e) above. Increase alt ^
values by 0.015 ^
(]) Houncain strt<.iis; no vegetation In channel,
bank^ usually steep, trees and brush along
banks submerged at high stage
(a) Bottom, gravel, cobbles and few boulders
(b) Bottom, cobbles with large boulders
Roughncs i
Coefficient (n)
I b. Flood plains (adjacent co natural streams)
(I) Pasture, no brush
(a) Short grass
(b) High grass
Cultlvsccd areas
(a) No crop
(b) Mature row crops
(c) Mature fleld crops
Heavy weeds, scattered brush
Light brush and trees
Medium to dense brush
Dense wlI lows
Cleared land with tree stumps, 100-150 pi;r acre
Heavy stand of timber, little undergrowth
(a) Flood depth below branches
(b) Flood depth reaches branches
(2)
(3)
(M
(5)
(6)
(7)
(8)
0.0<i0
0.050
0.05S
0.030
O.CliO
O.OltO
0.060
0.050
0.060
0.030
O.OdO
,o<.a
.OdO
.050
.050
060
090
170 0.060
O.IIO
0.11(0
(1)
(2)
(3)
(M
NOTES
Based on materials and workmanship required lo th* Standard Specifications.
For pipe flowing full.
Use value of 0.012 If trowled and 0.025 If purposely roughened.
These values are offered as .-guide. For Important work and where accurac*
determination of wac*r surface profile Is per.esjary. the designer should
consulc Che Flood Concrot Discrlec office to obtain daca regarding n
values applicable to specific streams.
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