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HomeMy WebLinkAboutArea 10 AREA 10 Rational method, 100 year storm Yb calculation PROJECT #3-4 100yr HYDROLOGY UPDATE San Bernardino County Flood Control District Planning Division, September 1997 •_, .- t . 1 „,..„._ • .: ,...t ' • . '7 04 . . . - - JEJ,„clin 1 I i • ' ' illilli ' 7_-: ._.- --,...--- ••••• • • Li . _ _ _ . -1- . ____, , _ _ - - _. _,.......___,,...........■ ,........... m!...■ . - r - .... --- -0 , Now , ... - no. -....Airz-±L — --= — — - -- - . . ill - -- --• ■•-• -- • - .--,..... •""..- 111111111 4111. ; .. 7. . - - -- I , . _ -7c -,■&_- -..-3 ilimP- at ' — " • • ' ' * :AMMON : • : • - -: i.• if la'=',1 - ' • A :r. — - --;,•7 , - : 0 r - - pa ipit :y an.ip .:71_. 11 .. iblitio ....t . .4A. •i . . ......, ... A . . ..1 I -( la d _ •-• I l'Opi .• f - • al , _ - . , pow -- --* —...csa ." 7. ISA , krig 1001 : • kVA 4&- * il * . - MI . _... . - r I lk ... . . ..- •- ..--:- .-- .." 'N ,:- N. it A, e ■ Ili - . . . • I '' ------- -14 - .11' i ' ''' OW ; ., . ... : . 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LIME OF PEAK FLOW(HR) = 16.67 RUNOFF VOLUME(AF) = 1062.81 TOTAL AREA(ACRES) = 2791.98 PEAK FLOW RATE(CFS) = 279 \JOTE: PEAK FLOW RATE DEFAULTED TO UPSTREAM VALUE SUBAREA AREA - AVERAGED RAINFALL DEPTH(INCH): 5M = .46; 30M = .93; 1HR = 1.17; 3HR = 2.19; 6HR = 2.90; 24HR = 5.80 ******************* tf************ t * * * **** *** ** ** * * * * ** * * * * * * * * ** FLOW PROCESS FROM NODE 802 . C : ' TO NODE 2000.00 IS CODE = 5 . 1 » »>COMPUTE TRAPEZOIDAL CHANNEL FLOW ««< » » >TRAVELTIME THRU SUBAREA (NEW ELEMENT) c «< I ELEVATION DATA: UPSTREAM(FEET) = 874.80 DOWNSTREAM(FEET) = 870.26 CHANNEL LENGTH THRU SUBAREA(FEET) = 700.00 CHANNEL SLOPE _ .1065 CHANNEL BASE(FEET) = 15.00 "Z" FACTOR = 1.500 i MANNING'S FACTOR = .015 MAXIMUM DEPTH(FEET) = 7.00 CHANNEL FLOW THRU SUBAREA(CFS) = 2794.33 1 FLOW VELOCITY(FEET /SEC) = 19.74 FLOW DEPTH(FEET) = 5.93 TRAVEL TIME(MIN.) = .59 Tc(MIN.) = 49.74 i 4 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Ill 'OW PROCESS FROM NODE 2000.00 TO NODE 2000.00 IS CODE = 8.1 >-' »ADDITION OF SUBAREA TO MAINLINE PEAK FLOW« «c 1 MAINLINE Tc(MIN) = 49.74 * 100 YEAR RAINFALL INTENSITY(INCH /HR) = 1.377 SUBAREA LOSS RATE DATA(AMC 11): DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS LAND USE GROUP (ACRES) (INCH /HR) (DECIMAL) CN LI COMMERCIAL A 201.51 .98 .10 32 COMMERCIAL B 32.49 .75 .10 56 SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH /HR) = .94 SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = .10 II UNIT- HYDROGRAPH DATA: RAINFALL(INCH): SM= .46;30M= .93;IH= 1.24;3H= 2.18;6H= 3.19;24H= 6.83 S- GRAPH: VALLEY(DEV.) =100. 0o;VALLEY(UNDEV.) /DESERT= .0's M II OUNTAIN= .0%;FOOTHILL= .0%;DESERT(UNDEV.)= .C% Tc(HR) _ .83; LAG(HR) = .66; Fm(INCH /HR) = .34; Ybar = .34 USED SIERRA MADRE DEPTH -AREA CURVES WITH AMC II CONDITION. UNIT- INTERVAL(MIN) = 5.00 TOTAL AREA(ACRES) = 3025.98 LONGEST FLOWPATH FROM NODE 100.00 TO NODE 2000.00 = 25252.00 FEET. TIME OF PEAK FLOW(HR) = 16.75 RUNOFF VOLUME(AF) = 1162.33 TOTAL AREA(ACRES) = 3025.98 PEAK FLOW RATE(CFS) = 2976.44 II SUBAREA AREA - AVERAGED RAINFALL DEPTH(INCH): • "-M _ .43; GM = .89; 1HR = 1.17; 3HR = 1.98; 6HR = 2.75; 24HR = 5.75 1 .*.*************************************** t * * * * * * * * * * * * * * ** * * * * * * * * * * * * ** FLOW PROCESS FROM NODE 200L.00 TO NODE 2000.00 IS CODE = :5.2 I » » > PEAK F LCWFATE TAELE TO A FILE« «< ------- ___��-- FILE NAME: ,�, {Iow DNA---------------------- - - - - -- :;. FLC.v�PA_i _. 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