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HomeMy WebLinkAboutPE 2.89.12; DONAHOE RESIDENCE; HYDROLOGY AND HYDRAULIC CALCULATIONS; 1989-10-17NOV 15 1909 SDE 3644 0176 .MIS OCTOBER 17, 1989 vo CITY OF CARLSBAD DEVELOP. PROC. SERV. DIV. HYDROLOGY & HYDRAULIC CALCULATIONS FOR THE DONA}IOE RESIDENCES DESCRIPTION: PARCELS 3 & 4 OF P.M. 12016 CITY OF CARLSBAD PERMIT NO. DRAWING NO. 299-8 & 299-9 ENGINEER OF WORK 49 R.C.E. #28479 1t4isfo ? \ 0 SDE 3644 CD tao. 28479 OCTOBER 17, 1989 PAGE 2 CLoF HYDROLOGY STUDY PARCELS 3 & 4, P.M. 12016 DRAWING NO. 299-8 & 9 ASSUMPTIONS BASED UPON A SITE INVESTIGATION, IT IS MY DETERMINATION THAT AN OVERALL HYDROLOGY STUDY WOULD BE THE MOST EFFICIENT WAY TO ANALYZE THESE PROPERTIES. THE COUNTY "DESIGN & PROCEDURE MANUAL" WAS EMPLOYED, BASED ON THE FOLLOWING CRITERIA: —SOIL TYPE - GROUP D (WORST CASE) —LAND USE - SINGLE FAMILY RESIDENTIAL C=0.55 II. DESCRIPTION OF LAND & HISTORY THE MAJORITY OF THE DRAINAGE BASIN CONSISTS OF GENTLY ROLL— ING TERRAIN WITH A MIXTURE OF BOTH OLDER AND NEWER HOMES. THE VEGETATION SEEMS TO BE CONSISTENT WITH SOUTHERN CALIFOR— NIA, ie, SCRUBS, GRASS LAWNS, MIXTURE OF IMPERIOUS SURFACES TREES ETC. EXPLANATIONS OF CALCULATIONS THE DRAINAGE BASIN IN QUESTION WAS DIVIDED INTO SUB— WATERSHEDS. THESE WATERSHEDS WERE DETERMINED WITH CON— SIDERATION GIVEN TO THE TOPOGRAPHY OF THE AREA AND THE PRESENSE OF STREETS AND "GUTTER" FLOW. (NOTE THAT BOUND— ARIES FOR THE WATERSHEDS NOT LYING ON EXISTING STREETS CROSS THE TOPOGRAPHICAL LINES AT RIGHT ANGLES. THE DRAINAGE BASIN HAS BEEN DIVIDED INTO FIVE MAIN SECTIONS A—E. SECTION A HAS BEEN SUBDIVIDED INTO SIX AREAS TO CALCU— LATE THE APPROPRIATE Tc, TIME OF CONCENTRATION AND Q FLOW FOR THE AREA. ALL CALCULATIONS TO FIND Tc AND Q FOR AREAS Al - A6 —E WERE DONE IN FOLLOWING MANNER. THE RESULTS ARE PRESENTED IN TABULAR FORM. S SDE 3644 OCTOBER 17, 1989 PAGE 3 EXAMPLE: AREA Ac AREA (A2) = 2.4 Ac DELTA H = MAX HEIGHT - MIN HEIGHT = 320' - 245' = 75' OVERLAND LENGTH = DISTANCE FROM MAX HEIGHT TO MIN HEIGHT L =650' % SLOPE = DELTA H/L (100%) = 751 /650' (100%) = 11.5% USE URBAN DRAINAGE CHART. WITH % SLOPE ABOVE AND OVERLAND LENGTH TO FIND OVERLAND TRAVEL TIME 5 USE INTENSITY-DURATION DESIGN CHART WITH DURATION, T TO FIND IN- TENSITY. I = 3.4 IN/HR USE RATIONAL METHOD Q = CIA WHERE C = 0.55 Q100 = 0.55 X 3.4 X 2.4 = 4.5 cfs CHECK FOR GUTTER FLOW AND GUTTER FLOW APPLIES FOR THIS AREA. S S SDE 3644 OCTOBER 17, 1989 PAGE 4 GUTTER FLOW: DELTA H = MAX STREET HEIGHT - MIN STREET HEIGHT = USE ELEVATION @ INLET FOR MIN STREET HEIGHT = 2451 -. 205' = 40' GUTTER LENGTH = 1100' % STREET SLOPE = DELTA H/L (100%) = 40/1100 (100%) = 3.6% USE Q100 = 4.5 cfs (FROM OVERLAND PART), THE GUTTER AND ROADWAY DISCHARGE - VELOCITY CHART INCLUDED AND THE % STREET SLOPE TO FIND THE VELOCITY OF Q. V = 4.4 fps TIME = DISTANCE/VELOCITY = 11001 /4.4 fps = (244 SEC) /60 = 4 MIN. Tc = Toverland + Tgutter = 15 MIN. + 4 MIN. = 19 MIN. 2.9 IN/HR Q100 = CIA =0.55X 2.9X2.4 = Q100=3.8cfs C • . . -o 1 u1 OVERLAND FLOW: GUTTER FLOW . CONCENTRATED FLOW . . SUBAREA AREA H I S I I Q100 APPLIES H .1 S V I Ic Ic Q100 (Ac) (Fl) (Fl) (*) (KIM) (IN/HR)(cfs) (YES,NO) (Fl) (Fl) (%) (fps) (MIN) (MIN) (IH/HR) (CFS) Al 2.9 . 40 750 5.3 18 3.1 4.9 NO - : 18 3.1 4.9 . A2 2.4 75 650 11 5 15 3.4 4.5 YES 40 1100 3.6 4.4 4 19 2.9 3.8 A3 8.5 97 1000 9.7 19 . 3 14 YES 15 400 3.8 5.5 1.2 20 2.8 13 . A4 5.7 65 350 18.6 10 4.5 14 YES. . 55 1800 3.1 . . 5 6 . 16 3.4 10.7 . . . . AS 4.1 65 450 14.4 11 4.2 9.5 YES 60 2500 2.4 4.5 9. 19 3 6.8 . . . . S . A6 3.1 30 .550 5.6 16 3.4 5.9 YES 55 800 6.9 . 6 . 2.2 18 3.1 5.3 S .. TOTAL 44.5 cfs B 4 40 1000 4 23 2.6 5.7 YES . 15 400 3.8 4.6 1.4 24 2.6 5.7 . . 5• C 2.6 25 600 4.2 8 4.5 6.4 HO - - - - - 8 4.5 6.4 REGIS, D 0.35 10 250 4 11 4.1 0.8 NO . -. . - - 11 4.1 0.8 5 STEA, E 0.8 10 250 4 11 4.1 1.8 NO - - - - - 11 4.1 1.8 WI' • S . . )L /' r 4 I :•:: \ :: :. Y / / c I.. ' I - .- .4 - -, c 4 - 4 4' 1 - 17 4 1 - 44 1' . •J -, A / / 'I / t ti1::- 0•• - p •_ - I. 00 u 2. U II-A-13 .• j• COJUTY OF SAU DIEGO DEPARTMENT OF SANITATION 1BOYEP -1U PtflECRP t.LTT1Jc% FLOOD COMM ,..20.-' ISOPLUVIALS OF 100-YUfl 6-110011 PRECIPi'ATION IN EiT{S O AN ICU lilt I- o 30 H _ SAN 30 10 CL h (NIL If lk 15 1 25 25 NCOIIUIDO 1.0 so 45 gc'A' ;;o U.S. DEPARTMEN r or COMMERCE = IZR C 20' 1 20 0251 ~35 3 64 1151 30' 15' 117 15 30' 15' 116' JI1rNSITY-.DUMT ION DESIGN. CHART . 11 . . i..i.i•iiini:hr. Directions for Application: j Equation: I 7,44 p D 1) From precipitation naps, determine 6 hr. and Intensity (Xn /)tr ) 24 hr. amounts lot' the selected frequency. . These maps are printed in the County Hydrology I II P6 6 Hr. Procipitation (In.) Manual (10, 50 And 1 00 yr. maps Included In the i' Iin FlIJ''r... D Duration (Min.). Design and Procedure tanual). 40 Adjust 6 hr. prec1p1tation (If necessary) so thin* the range of 45% to 65% of that it is wt 3. to Dos t Cn ) Plot 6 hr. precipi-tation-on the rig~t Ode of the chart. J. If : Draw a line through the point parallel to tha ro , plotted lines. ' I NtIIIi1 Li!IIiiI1 1 '11 I ort 5) This line Is the Intensity-duration curve for . th location being analyzed. : .• i,, ii; •' 5,0 r rLJll 1'iII'J 0 Application Form. 35fl ' - I IN.... Il1-... •i: N*II ;. ' 0) Selected Frequency (oc _yr. 3.0 .2.. • . * 1 ih4L .!:!i:J..hiiJltI 1 . 1) a 2.p jfl p24k 4 24 0 2) Adjusted *p ____i n 7- M _7 l1fI1.5 3) - 4) 1 u _______ 'H . *fl ' Region ' :::::•::': . P .................................. -- - •..• - .. . ---. ....... . c 15 20 30 40 50 .1 2 • 3 4. 5 6 . ' PPENDIX XI Minutes ' Hours • . . . Revised 1/8S RUNOFF COEFFICIENTS (RATIONAL. METHOD) LAND USE Coefficient, C Soil Group (1) A C . Undeveloped .30 .35 .40 .45 PResidential: Rural .30 .35 .40 .43 Single Family .40 .45 .50 .55 Multi-Units .45 .50 .60 .70 Mobile Homes (2) .45 .50 .55 .65 Commercial (2) .70 .75 .80 .35 80% Impervious Industrial (2) .60 .85 .90 .95 90% Impervious . NOTES:. S (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 n0 case shall the final coefficient be less than 0.50; For example: • ConscJer commercial property on D soil group. • • ::::t:::::::::ess = 3% Revised C = X 0 85 = P. • • •t (.M-0- APPENDIX IX 2.•ir• ' jZ( . . .. . .. -. • --.. . ... .. 4 • •• . .• . - .•: 1 - - - •• .r. •.• .. ---'-• -- - — - - • - . _:. • - • ' $ •.: • •. IIMEOFCOWZWRA 770ff - IC.. 07 No 28479 .- Ex 3- aco - ill I! iiTTf1 / liii Vt// / .iT717t[I/t • _ E00 if r _J1,LLUL! I I I Ill; •1 I 10 I I A 1111 I I JJ I1 / / • cr, ___ J I I II A I 1 Cit !IIIIIIIIIA 400 II .LII7L7Jr7Li60 0 I I I I I F I I I I I - I. 7 ;.• - ?r ,'-1- J-. • •ft &_•____• . 0 1 1 I I F / I 1 -. • •••••=_•_ - J JJ/ / / ( f y • - --- .._ , j V i ii i .. •,- 20c- _LLIJ_L/_ I ___ — 40 I I I i1ITT7 I•• I Il/f/Il . •, IIJIA/il £ • :ni_--- Ill//V//I • • . '.. jz- r TZ fr-3t,~ C - -,-- —v--, i - 20 rts. • . tt • FlQw,3-10 Overland time ol flow graph. • 1 )f PACE uA I. LS' .015 DoPM 0.13 MIDEWIN- STREET 20 - 16 -4 r --=& Jf / __ 8- (J.L b -jT _3&1, ;-- - .. 1...' ... iii .--: .i U, U- i . ..; i .i-- I -s-- .4._...•... • r.--..--.-S/. -. --.. . -- 1.8— •- ..":- r Ls :L- -r--r- 1.4 4:; - =ti -'4 - LZ A.77 . .- tT7 9T. -:- ..- *E; ...- ... I - I I LO_ r. VV - - 6 :L I- I • i F i i ttT r Ak I - 2 3 DcHAR EXAMPLE: Given' Q=iO 5= 2.5'/. Chart DeØh: 0.4, Velocity . SAN DIEGO COUNTY IGUTTER AND ROADWAY DEPARTMENT OF SPECIAL DISTRICT SERVICES DISCHARGE—VELOCITY CHART DESIGN MANUAL L . APP ROVE D_________________________ DATE __________ APPENDIX X-D, S SDE 3644 OCTOBER 17, 1989 PAGE 12 ESS, No. 28479 tp ow- HYDRAULIC CALCULATIONS ' PARCEL 3, P.M. 12016 DRAWING NO'. 299-8 ASSUMPTIONS THE FLOW ONTO THIS PROPERTY IS VIA AN EXISTING 18" CMP CULVERT SYSTEM, COLLECTING. DRAINAGE FROM AREAS A & B AND OVERLAND FLOW FROM AREA C. AREA A'S FLOWS 'COLLECT INTO THE RIGHT GUTTER OF PARK DRIVE AND AREA B'S FLOWS 'COLLECT INTO THE LEFT GUTTER OF PARK DRIVE. CALCULATIONS AREAS A, B &.0 THE FOLLOWING CALCULATE THE DEPTH OF FLOW AND CAPACITIES ALONG PARK DRIVE TO DETERMINE THE FLOWS ENTERING THE 18" CMP AND TO DETERMINE IF THERE IS ANY OVERFLOW FROM PARK DRIVE ABOVE THE SUB— JECT PROPERTY THAT WOULD AFFECT THE FLOWS ONTO THE SUBJECT PROPERTY. .' '. . ' .• ' FIVE SECTIONS, WERE CHOSEN - ABOVE' THE. INLETS, AT THE UPPER INLET, ONE BETWEEN THE INLETS, AT THE LOWER INLET. AND AT THE DRIVEWAY WITH THE LOWEST --- BELOW THE STATION INLETS. STATION 9+00 -.UPSTREAM OF INLETS fITS..: '20-1. Os .' , / 0.0' 01.t4 -5 'LEFT GUTTER=. 5.7 CFS 'WATER DEPTH= 0.33 FT WATER SURF= 207.38 ELV w.s.201.015 O '. *5 *%0 -5 +2-0 SLOPE 3.0% , 'RIGHT GUTTER= 39.6 CFS WATER DEPTH=. , 0.63 FT WATER SURF= 207.05 ELV • SDE 3644 OCTOBER 17, 1989 PAGE 13 ii ha O. 28479 Vk t j; STATION 8+10 - INLET ON RIGHT ov —SO. —,t5 —IC --5 0 *5 10 +15 SLOPE 2.3% LEFT GUTTER=. 5.7CFS RIGHT GUTTER= 44.5 CFS WATER DEPTH= 0.40 FT WATER DEPTH= 0.63 FT WATER SURF= 205.29 ELy WATER SURF= 205.27 ELV THE INLET CAPACITY IS CALCULATED FROM THE "CAPACITY OF GRATE IN- LET IN SUMP" CH.ARTAS S P 2(a+b) = 2(1.6+3.0) = 9.2 • = p*3.0*H(3/2) 9.2*3.0+(0.63)312 = 13.8 CFS * THIS IS THE MAXIMUM FLOW INTO THIS INLET, NOT DEDUCTING ANY- THING FOR THE cMP PIPE BLOCKING FLOW FROM THE 2 SIDES. THE FLOW-REMAINING IN THE LEFT GUTTER IS 44.5 - 13.8 OR 30.7 CFS STATION 8+00 - BETWEEN INLETS O5.18 - 05. +146 0.0 2.04-11 204.6Z S to 15 10 5 +0 +5 410 +15 •• SLOPE = 2.3% LEFT GUTTER= 5.7.CFS • • RIGHT GUTTER= 30.7 CFS WATER DEPTH= 0.4 FT • • WATER DEPTH 0.51 FT WATER SURF= 205.11 ELV, WATER SURF= 205.17.FT S SINCE THE FLOW IN THE RIGHT GUTTER IS DEEPER THAN THE CENTERLINE •, OF PAVEMENT, WATER FLOWS FROM THE RIGHT GUTTER TO THE LEFT GUT- • TER. THE CAPACITY OF THE RIGHT GUTTER AT THIS POINT IS 22.2 CFS. THEREFORE 8.5 CFS FLOWS INTO THE LEFT GUTTER, BRINGING THE TOTAL FLOW IN THE LEFT GUTTER TO 13.2 CFS. SDE 3644 OCTOBER17, 1989 PAGE 14 S - STATION 7+85 INLET ON LEFT 0.0 -10 -5 0 +5 +10 k t5 4Z0 SLOPE = 2.3% LEFT GUTTER= 13.2 CFS RIGHT GUTTER= 22.2 CFS WATER DEPTH= 0.37 FT WATER DEPTH 0.45 FT_ WATER SURF. 204.25 ELV WATER SURF= 204.73 ELV - THE INLET: CAPACITY OF THE. LEFT INLET CALCULATED FROM THE "CAPACITY. OFGRATE INLETS IN SUMP" CHART IS: •P-=-2(M-b) = 2(2.2+3.6)= 11.60 FT Q= p.*3.0*H(3/2) = 11.6*3.0*(0.37)3/2 = 7.8 CFS -THE FLOW REMAINING IN THE LEFT GUTTER IS 13.2 -7.8 CFS OR 5.4 CFS. - -. 'S. '• THE LOWEST DRIVEWAY CREST IS AT STATION 7+55 BELOW THE -INLETS, THEREFORE THE.'-WATER DEPTHS ARE CALCULATED AT THIS POINT. STATION 7+55 • • • : • SLOPE = 2.15V LEFT GUTTER= 5.4 CFS •. RIGHT GUTTER= 22.2 CFS WATER DEPTH= 0.26 FT -. WATER DEPTH= 0.45 FT WATER SURF= 203.42 -ELV WATER SURF= 204.15 ELV GUTTER CAP= 45.7 CFS GUTTER CA= 14.6 CFS 40 EVEN THOUGH THE RIGHT GUTTER CAPACITY IS DECREASED AS THE SLOPE FLATTENS, THE LEFT GUTTER HAS AMPLE CAPACITY TO RETAIN THE FLOWS WELL PAST THE SUBJECT PROPERTY. • - S E Ssì, No. 28479 SDE 3644 OCTOBER 17, 1989 PAGE 15 THE TOTAL FLOW IN THE 18" CMI' SERVING THE INLETS IS THE SUM OF THE FLOW FROM THE 2 INLETS PLUS AREA C OR Q100= 13.8 CFS + 7.8 CFS +6.4 CFS =28 CFS THE FLOW ENTERING THE PROPOSED 24" CMI' IS 28 CFS. THE HYDRAULIC CALCULATION FOR THE FLOW IS: DIAMETER (INCHES)... 24 MANNINGS N ....'... .013 SLOPE'(FT/FT) ........S 0.0175 Q(cfs) ...........28 DEPTH (FT) ...........' 1.53 DEPTH/DIAMETER.,.. 0.77 VELOCITY (fps) ........ , 10 .82 ' VELOCITY HEAD.....1 .82 AREA (Sq> Ft.) 2.59 CRITICAL DEPTH.......1.83 CRITICAL SLOPE.... 0.0133 CRITICAL VELOCITY 9.30 FROUDE NUMBER.....1.54 THE CAPACITY OF THE 24" AT' THIS SLOPE IS 37.5 CFS WHICH IS GREATER THAN THE REQUIRED CAPACITY. AREA D5 ', Q100'= 1.8cfs - FROM HYDROLOGY STUDY THIS FLOW IS FROM ALTHEA LN AND ENTERS PROPOSED CURB, OUTLET PER IMPROVEMENT PLAN DWG. NO. 29274 -CAPACITY OF TYPE "A" (D-25) ' CURB OUTLET A=0.75S.F. R= 0.75/6.5 = 0.115 ' N =0.014 S .017 Qcap 1.486 X 0.75 X 0.115 X .017= 2.43 CFS 0.014 Q cap > Q100 O.K. S -THE FLOW EXITING 'THE 24" CMP INTO THE ENERGY' DISSAPATER HAS A VELOCITY OF 10.8 FPS. BASED UPON S.C.S. TABLE 200-1.6.1 SELEC-, TION OF RIPRAP AND FILTER BLANKET MATERIAL, A ROCK CLASS OF "LIGHT" IS REQUIRED. 0 No. 28479 V SDE 3644 lvk OCTOBER 17, 1989 PAGE 16A • CHECK VELOCITY AND Q FOR PROPOSED EARTHEN SWALE ALONG THE EAST PROPERTY LINE OF PARCEL 3 TO VERIFY BERMUDAGRASS AS BEING A SUITABLE SLOPE PROTECTION. THE SWALE EMPTIES INTO CATCH BASINS AT THE NORTH AND SOUTH ENDS OF PARCEL 3 AND THE MOST CRITICAL SLOPE IS 7.07%. 0 TRIANGULAR CHANNEL TIME: 12:46:08 INVERT WIDTH (feet) 0.00 MANNINGS n 1..035 SLOPE (feet/foot) .0707 Q (cfs) .......... 0.80. LEFT SIDE . RIGHT SIDE 0 SLOPE (X to 1) .........4.0 SLOPE (X to 1)... 2.00 DEPTH (feet) ...........0.30 TOP WIDTH (feet.). i.78 VELOCITY (fps). .........3.02 VEL. HEAD (feet). 0.14 AREA (square feet) 0.26 P + H (pounds)... 6 • . • CRITICAL DEPTH ........ .0.34 CRITICAL SLOPE... 0.0344 CRITICAL VELOCITY 2.32 • FROUDE NUMBER.... 1.38 THE VELOCITY FOR THE EARTHEN SWALE AT A SLOPE OF 7.07% IS 3.0 F.P.S. WHICH IS LESS THAN THE 8.0 F.P.S. ALLOWABLE FOR BUR- MUDAGRASS, THEREFORE IT IS SUITABLE TO BE USED FOR SLOPE PROTEC- TION. 0 • . 10 SDE 3644 ' OCTOBER 17, 1989 PAGE 16B CHECK CAPACITY AND VELOCITY OF D-75 (TPYE A) BROW DITCH AT - SOUTHEAST CORNER OF PARCEL 3 AND WHICH EMPTIES INTO PROPOSED DIS-. SIPATOR BOX. USE Q100= 0.8 C.F.S. AND A SLOPE OF 20%. BROW DITCH D-75 (TYPE A) DIAMETER (inches)...... 24 IV1ANNINGS N......., .013 SLOPE (ft/ft) .........0.O20. Q(cfs) ........... 0.80 DEPTH (ft) . . ........0.22 DEPTH/DIAMETER.... 0.11 VELOCITY (fps) ........4.31 VELOCITY HEAD..... AREA (Sq.Ft.) ........0.19 CRITICAL DEPTH........ 0.31 CRITICAL SLOPE.... 0.0048 CRITICAL VELOCITY 2.62 FROUDE NUMBER..... 1.97 THE CAPACITY AND VELOCITY IS SIGNIFICANTLY LESS THAN THE MAXIMUM ALLOWABLE, THEREFORE THE BROW DITCH DESIGN IS SUITABLE. * SDE 3644 OCTOBER 17, 1989 PAGE 17 HYDRAULIC CALCULATIONS PARCEL 4 P.M. 12016 DRAWING NO. 299-9 CHECK VELOCITY AND Q FOR PROPOSED EARTHEN SWALE AT NORTH SIDE OF PARCEL 4 TO VERIFY BERMUDAGRASS AS BEING A SUITABLE SLOPE PROTEC- TION. THE MOST-CRITICAL SLOPE OF THE SWALE IS 14%. TRIANGULAR CHANNEL INVERT WIDTH (feet)..... 0.00 MANNINGS n....., .035 SLOPE(feet/foot) ........1400 Q,(cfs) ........, 1.80 'LEFT SIDE ' RIGHT SIDE SLOPE..(X to 1) ..........2.00, SLOPE (X to 1).. 2.00 DEPTH (feet) .............0.42 TOP WIDTH (feet) 1.67 VELOCITY (fps) ........... 5.18 , VEL. HEAD (feet) 0.42 AREA (square feet) ......0.35 ,. P + M. (pounds).. 21 CRITICAL DEPTH...........0.55 CRITICAL SLOPE.. 0.0319 CRITICAL VELOCITY......: 2.98' FROUDE NUMBER... 2.00 THE VELOCITY FOR THE EARTHEN SWALE AT A SLOPE OF 14% IS 5.18 F.P.S. WHICH IS LESS THAN THE 6.0 F.P.S. ALLOWABLE FOR BUR- MUDAGRASS, THEREFORE IT IS SUITABLE TO BE USED FOR SLOPE PROTEC- TION. . •H. . No. 2473 OCTOBER 17, 1989 PAGE 18 OF CAIA CHECK VELOCITY AND Q @ PROPOSED CURB OUTLET @ SOUTHWEST CORNER OF PROPERTY. : DIAMETER (INCHES) 24 MANNINGS N ........ .016 SLOPE (FT/FT) .........0.0150 Q (cfs) ..........1.8 DEPTH (FT) ...........0.38 DEPTH/DIAMETER 0.19 VELOCITY (fps) 4.29 VELOCITY HEAD .....0.29 AREA.(Sq> Ft.) .42 S CRITICAL .46 DEPTH.........• CRITICAL SLOPE 0.0068 CRITICAL VELOCITY 3.25 FROUDE NUMBER.. . 1.46 BASED ON CURB OUTLET CALC FOR D.P. #3 Qcap = 2.43 > Q100 = 2 (0.9) = 1.8 CFS 1 'V 17 ... ... . - 1073.02 • . _ f '•I •''•' Ex p:(o+b) 2 i A60W 1 r—r , i,,- 111111•11 -;-I-rr -- _____ ____77 _____ I •. .4:i_ EE'EE EE EEEI • 2 3EEE ___ __ Itit _LL.1i'14'/z Ld 1PI OH, UI? TO p j:i Et(Oj IIES 12. E ______ - - - I - _ I. I_ _LI. L_ rHAS 8ET\1EE4 ô.'jEi. jTF TION Ia c!no i !o'itT • I ____ j PR L j PZRER(0J)•D)S;t cv P oaT j_•_ • .I t i s • . • ,I..• :I•. ii. • I. .!.j...i I ç ' .t • •..' • .G . .U.0 Co UUTEtJ Or Ll. no,'.rs CAPACITY OF GRATE INLET IN SUMP c6 tJ DW:SCHTV1O • WASH., D.C. • WATER POIIDED ON GRATE S.:. •:. :4 1+00.00, 191.1000 CL Park & Tamarac 2+00.00, 192.5900 3+00.00. 194.5300 . 4+00.00. 196.5500 5+00.00. 198.5800 6+00.00, 2005200 . . . .3' lid* \ 7+00.00, 20.29200 0 P•11 I-I tT1 7+85.50, 203.88 Rim Elev Grate Inlet, 13 9 Lt \ 8+00.00, 205.0600 \8+10.00, 204.64. Rim Elev Open Inlet, 14.6' Rt .3' 9+00.00. 207.3800 \+0o.00.21o.37oo . • IN It It • • ':°°°' 215.4200 \11+80.50, 219.9700 ci Park & Monroe