HomeMy WebLinkAboutCT 96-03; PACIFIC VIEW ESTATES; HYDROLOGIC/HYDRAULIC REPORT; 2000-09-07Hydrologic/Hydraulic Report
Pacific View Estates
DWG 358-9B
Prepared By:
Dudek & Associates
605 Third Street
Encinitas, CA 92024
September 7, 2000
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PROJECT NO.: DATE: BASIN EXISTING NOTES: 2282 8/7/00 HYDROLOGIC CALCULATIONS WORKSHEET PACIFIC VIEW ESTATES PRECIPITATION LAND USE Rural SOIL GROUP C FACTOR P5= 2.7 (in.) P24 = 4.5 (in.) P5/P24 = 60% ADJUSTED P5 2.70 (in.) NODE EVENT AREA AREA (yr) (ft2) (acre) 100 27,639 0.63 D 0.45 90% Impervious RUNOFF TIME OF COEFFICIENT CONCENTRATION (C) (Tc) (min) 0.7 EXISTING CONDITIONS 10 0.95 INTENSITY (I) (in/hr.) 4.50 DISCHARGE (Q) (cfs) 2.00 COMMENTS (1), (2), (3) (1) Minimum Tc used for small simple watersheds with moderate slopes and paved areas as suggested in Caltrans Highway Design Manual (2) Composite C factor used (C = [C,*A1+C/A2]/A1) (3) Assume half flow enters upstream inlet and half enters downstream inlet (see hydrology map attached) ~ •
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COUIITY OF SAN O IEGO DEPARTMENT OF SANITATION & FLOOD CotlTROL ·100-VEAR 6-m:w~ Pi'itC!PITATUm ...--zo__,. ISOPLUVIALS r f 100-YEA!? 6-flOUfi ('[. Cf'. 'J '0 vJ :::.::\PO PfiEG{PiTl\T!Orl 1r;1 J [JjTMS G~ £HJ 1;.:cn • 0 0 z_ _J ;() ,1 Z 0 ~ (\ J? -J 0 ~ -s ~ J7 re L-IT' C z_ {__ I'· t:t7 (_ ~ ~ ~\ ~ ~ (/J \t' ~ ()\ Co ,) 33° 451 ~=~~--'~ ...... ,.,., .. , I 'l'/l'J1j'1 ...__, / ~tJ'J"' .. \..\ ,I.> ' -1 'TI" .. ' ;.50 . ·, ---:-:::::-;r:--~55;-~ ~ ;·~ ¼~ I -~ L/,cJ\~ []fAr.H (\ 301 I 30\ ; / . l--i ; (_ (. ·-SAN CL ",'. [ \ , . , . I l ·-.------' .. 30 · ._ 15 I ·-+-----l ncL,°iN'. 25 ~A... 25~ ' \ ! q,~---z..=i-" 2 \ 45' I I I 20/1 ( .... ii.I!.,\ 1 / ..... .... I ► I --..J Prrpn f:d by U.S. DEPARTi\lENlr OF COMMERCE NATIONAL OCl::ANIC AND ATiOSPll(;fllC AD~:IN!STRATION SPECIAL STUDIES DRANCH, OfflC~ Of tdDROLOGY, NATIONAL WEATHER SERVJC!: 301 1181 451 301 II ) . '\ SAt 2 15 I 117° l15 I 301 15 I 116°
;;o (1) < ~-l/1 (1) p.. ,_. -00 Ul ► "Cl "Cl rn z 0 ....... X X H I ::r: COUNTY OF SAN DIEGO DEPARTMENT OF SANITATION & FLOOO CONTROL 1,5 I '.Is:--30• 151 100-YE!\ll 24-MOl~H rnECIPITATlmJ ---2□J ISOPLU\/IALS Gr-100 -\'Ef\11 24-HOUH PRECIPITATIOf.l ft.J i"Ef-JTHS OF AtJ lrJCH '.~~Jl\\1)~F~.~-4u\~c:: ~ Z<\, =--4-.5 11 330 ,----------+--------+---------'r~I 451 Ptcpofd by U.S. DEPARTMENtr OF COMMERCE . ~~c J\ \cci,.~~~ 135 ~ \ :-: -15 . -...... 1:,..,---;-3~:: " ('. NATIONAL QCU\~IC ANO A"i"",\O~l'IIERIC AO~IINl>THATION "WAC nuo,cs "•"'\":.''"' oe-~ ""ococ,. _.., 'l"'L "'""" se "'" l / // · :;J '_/, I '-/ /1 . , 1. '-. •• _'11,·. / I I// I ( / . ---·' HJ ,•uus1do,o:J 10·-1u·6 --r,-.·-·r L--so-:i I-~-·~ I--1 l ll 0 1,1;' :,o• ]', I I I 7 o 1,'.;' I() I j l; I I I(, 0
rNTENSrTY.-DUMTION DESIGN CHART . . ·fl Ir. i !In, 'jj ·1 ·1 l.·l:.1.I LI I I lfr-:' o I 645 i ·rrlmmml "'"" I • 7. 44 P 6 D -• . , Equation: . (ln. /Hr. l ,. I • Intensity . . t. on (In. l i --,,---p = 6 Hr, Prec1p1ta l l 6 ·on Min. , Durat :1: , .. , :t 'I ii I t I, I 0 7 C: ·:·11 : : '.1' ~ . n ,;I ...,, 1;' 'O L I ~-~ ~ l? .o ~ ~ .s~ ~ .0" 1! .s -u O ...,, " . " -SG ~ • ro ~· ~-' o~ ~ . ~ • .... ~ • ......_.~r_,._, 5 ~ +' • ~ lil-H-TTTi,11 Lili+U--H+H~m1m11111 ~~¾m:1:,,~ •0 :;o CD < I-'• (/l • 0 . 5 CD "'-r-," • p. ► "'Cl .,, ~ ~= ~~~-· 11~@ _·_ X ,I rr, z 0 ...... I 10 ► 15 20 Min11h>c: 30 40 50 1 2 3 · 4 5 6 i-{n11rc:. Directions for Application: 1) From precipitation naps detennine 6 hr. and 24 hr. amounts for the selected frequency. These maps are printed in the County Hydrolo9y Manual (10, 50 and 100 yr. mars included in th( Design and Procedure Manual). 2) Adjust 6 hr. rrecipitation (if necessary) so that it is \vithin the ran9e of 45% to 65% of the 24 hr. precipitation.· (Not ,,rrlicabl to Desert) 3) Plot 6 hr. preciritation on the rior.t side of the cha rt. 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 __ __,,r. l) P6 = "l.1 in., P24= L\.5 , *p6 = <oD % ~4 in. -------2) Adjusted *P6= '2~+ 3) t = \0 C min. 4) I = L,l..5 in/ hr. *Not Applicable to Desert Region n
OFF COEFFICIENTS (RATIONAL M O OD)
DEVELOPED AREAS (URBAN)
Coefficient, C
Soil Group 111
Land Use 6 fi ~ Q
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 .3S .40 .45
Commercial 121
80% Impervious .70 . 75 .80 .85
Industrial 121
90% Impervious .80 .85 .90 .95
NOTES:
Ill
121
Soil Group maps are available at the offices of the Department of Public Works.
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 D soil group.
Actual imperviousness = 50%
Tabulated imperviousness = 80%
Revised C = 50 x 0 .85 = 0.53
80
APPENDIX IX
Updated 4/93
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ASSEMBLY AVAILABLE
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Appendix C: Circular Channel Ratios
Experiments have shown that n varies slightly with depth. This fi g-
ure gives velocity and flow rate ratios for varying n (solid line) and
constant n (broken line) assumptions.
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5-26 CIVI 'NGINEERING REFERENCE M UAL
Appendix D: Critical Depths in Circular Channels
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HW Depth for 8" PVC Drain
Downstream Segment
HW Calculation For partial full flow pipe
Equation used:
Critical Depth Ye= 0.63 ft.
Critical Velocity Ve= 5.88 ft.ls
Friction Loss Ke = 0.5
Velocity Head Loss (y/n) n
L'lH = 0.90 ft.
FL Elevation = 250.30 ft.
Rim Elevation = 255.00 ft.
!HWavailable = 4.70 ft.
Hwelev. = 251.20 ft.
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