BUREAU OF ENGINEERING City Of Los Angeles
DESIGN CHARTSFORCATCH BASIN OPENINGSAS DETERMINED BYEXPERIMENTAL HYDRAULICMODEL STUDIESBUREAU OF ENGINEERINGCity of Los AngelesLYALL A. PARDEECity EngineerOFFICE STANDARD NO. 108STORM DRAIN DESIGN DIVISION1965
OFFICE STANDARD NO. 108DESIGN CHARTSFORX-5 CATCH ?%SIN OPENINGSANDCATCII BASIN NO. 39, NO. litiAlJD NO. 47 OPENINGSAS DETti!'IMINEDBYEXPERIKENTAS, HYDRAULIC i'4ODELSTUDIESCONDUCTED BYBUREAU 93 EiGI.hiERINGCITY OF LOS ANGELESSTORM DRAIN DESIGN DIVISIONPART IAPRIL 1955PART IIAPRIL 1955PART III ADDEDJULY 1956PART IVADDEDMAY 1957PART VADDEDNOV. 1957PART VIADDEDNOV.1957PART VII ADDEDJAN. 1959PART VIIIADDEDMAY 1961L. 0. Tllrner - Division En@ neer 1955-1959Ulmont Swan - Division Engineer 1960 To DateF. J. Dorm- Project EngineerJune 1, 1961
INDEX-----Description and Use of Design Charts.Sample Problem.Supplement No. 1.Supplement No. 2PART I - C.B. No. 45 & No.46(X-5Type Curb Opening).Fig. 1- Dr-rta' lsof X-5 Catch Basin Opening.Chart LL-7- Design Charts, S 0.002.Chart LL-8- Desl.gn Charts, S 0.005.Char,? LL-g- Denigrj Charts, S 0.02 and 0.05.Chart LL-10 - Design Charts, Sump Conditions, S Zero.PART II - C.B. No. 40 Type Curb Opening.Fig.-2Details of MO. 40 Type Basin Opening.Chart LL-22 - Desigr; Charts, Sl 0.002.r,'!hartLL-.13 - Design Charts, S - 0.005.:7hart IL-14 -.Design Charts, S 0.002 and 0.05.chxrtI,L-ITi- DesJ.gn Chart?;, Sump Conditions, S Zero.r:/\,vrII -.C.B. No. &7(Pasadena Type) -. -- - ----- -.- -.ChTirt;LEd-.1 ii-IksignCharts, S 0.005; 0.01 and 0.02.Chart LL-17 - Design Charts, S 0.03; 0.05 and 0.09.
I N D E X (Continued)-es-PART IV - City of Los Angeles StandardGrating Capacity Charts.Chart No. -18 - Standardu-19- StandardLL-20 - StandardLL-21 - StandardLL-22 - StandardLL-23 - StandardU-24- StandardLL-25 - StandardCurb &Curb &Curb &Curb &Curb &Curb &Curb utter,Gutter,S S PS S es,Slopes,GratingGratingGratingGratin3 and &No.NO.No.NO.21 & 22 bt41, 2,PART VII - Description and Use of Catch BasinConnecting Pipe Capacity Charts, combinedwith "Catch Basin Outlet Transition Structure."Chart No.1.- Full PFpe (with Standard Transition Structure)2.- Control At Inlet (with Standard Transition)PART VIII - Description and Use of Catch BasinConnecting Pipe Capacity Charts, withoutCatch Basin Outlet Transition Structure.Chart No,Full Pipe (without Standard Transition Structure)Control at 'mwlthoutStandard Transitlon Structure.)AddedAdded3/3/!j92/j/60
DESCRIPTION AND USE OF DESIGN CHARTSFOR SIDE-OPENING CATCH BASINSTYPES X-5 AND NO. 39 - NO. 40Experimental hydraulic model studies of a new typeof catch basin and catch basin opening have resulted in thedevelopment of the design curves attached hereto@ The newopening referred to is known as the X-5 type and Charts Nos.LL-7 to LL-10, inclusive, Q ive the hydraulic characteristicsthereof on the several slopes indicated on said charts. Figure 1 illustrates the details of catch basin openings of thistype.A similar set of charts numbered LL-12 to LL-15,inclusive, reflect the hydraulic characteristics of openingsapplicable to Catch Basins No. 39 and No. 40 with appurtenantThese charts may be used as guides to theLocal Depressions.capacity of existfng curb openings and catch basins of thistype* Figure 2 illustrates the details of catch basin openings of this type.Both sets of charts have been developed from testsmade on street slopes of 0.00, 0.002, 0.005, 0.02, and 0.05.A sample problem and solution applying to the design chartsprepared for the X-5 type of opening has been included for thebenefit of the designer. Similar problems pertaining to No.39 and No. 40 catch basin charts may be solved by the appllcation of the same principles.CONCLUSIONThe studies so far conducted and the informationcontained in the attached charts do not cover the entire rangeof desirable catch basin information. Additional supplementaldata is expected to be available from time to time which maybe added to that contained herein.
SAMPLEPROBLEMUSE OF DESIGN CHARTSGIVENaThe storm water flow in half a street,constructedand the resultantcomputed depthon a 0.02 slope,is 90 cfs.of flow “D” above gutter grade is 0.85 feet.REQIJIRED:The number of basinsthe X-5 type of opening requiredand the length of each basinto interceptthis flow.ofSOLUTION:the capacitiesofChart LL-9, S 0.02 (indicatesThedecatch basins of variouslengthswhen D 0.65 feet).signer must now determinefrom fieldinvestigationand properconstructioncost the most desirablecatch basin length applicable to the particularproblem.1,feetthisIn this2.has been selecteddepth of flowrlength “W” of 28examplep a catch basinwhich has a capacityof 37@5 cfsr forbetween the totalof 90 cfs.and30 The differencecfs,(interceptedby the firstbasin)leavesa remainder ofto be -interceptedby the next or succeedingbasins.cfs.is 0.71, feet0The computed lrDll for 52.5 cfs,4. Again assuming a desirable length of basin of 28feet,Chart LL-9 indicatesthat such a basin will intercept26.0cfs.at a value of “D” of 0.71 feet,leavinga remainder o;hz6.5cfs.to be interceptedby the next or succeedingbaains.calculated“D” for 26.5 cfs.is ,0s60 feet.r.From Chart LL-9 a 28-footbasit ;ouldhave a cafor a 0.60 foot value ofD , leavinga repacityof 1 d .5 cfs.Howto be interceptedby a fourthbasin,.sidualflow of 8 cfs.ever,furtherexaminationof this chart Indicatesthat a 42-footbasin willinterceptthe entireflow of 26.5 cfs.with a depthIt remains next for the designerto best judgeof 0.60 feet.from the availablealternativeswhich selectionof catch basinlengthswill best fitthe localconditionsrC OMMENT:that a f afrly wideFrom the above, it is evidentchoiceof number and lengthsof basins(dependingupon localconditionsand economic factors)is availableto the designerIn generalthe effiby the intelligentuse of these charts.becomes less as the lengthciency,per foot of length of basin,Converselythe efficiency,per foot ofof the basin increases.Economicsas wellincreasesas its length is reduced6basin,as limitingphysics1conditions,therefore,controlthe numberand. length of basins requiredto intercepta given quantityofwater.
OFFICE STANDARD NO. 108SUPPLEMENTAL INSTRUCTIONSAugust 15, 1955Since the issuance of this standard, a number of instanaes of improper appiiaation and/orinterpretationof theCharts Nos. LL-7 touse thereofhas come to our attention.andLL-10 inalusive, appliaable to the X-5 type of basin,Charts Nos. LL-12 to LL-15 inclusive, applicable to types39and 40 basins (having appurtenant local depressions) were developed to indicate the 'Maximum Interception" of eaah typfi ’basin for each length on each slope for variousvaluesofD .From the experimental data accumulated in the model study,formulas applicable to each chart were developed and the curvesshown thereon have been plotted from these formulas.Subsequent to the issuance of this office standard,attempts have been made to use these charts to determine "TotalInterception" of small quantities of water. The charts werenot basically conceived or developed to answer such questions.More recent model study has indicatad a deviation between theactual measured quantities of "Total Interception“ and thetheoretical quantitiescated on the charts for small valuesof "D" (generally belowfeet to Oo7 feet prototype)oThe experimental model studies from which these chartswere derived were based upon streetsof zero crossfall, uniformcrown height "H" (above gutter) of 000125W, where '(H" and "W"are measured in feet0 A specific "Street Capacity" curve shouldtendeveloped using increasing values of "'3" and proper values ofSfor this or any other specific street cross section beingstudied0 When this curve is superimposed on the proper DesignCurve, the specific use of the Design"CJI.r1 *r islimited to thosePoints to the right of and above the Street Capacit ' curve0Conversely, all points to the left of and below the Streetcapacity" curve are imaginary" In al.1 ca:: sitshould be recognized that it is necessary to determine the correct value of "D"to seaure valid results and "D" is extremely critical on moststreet sections when Q fs small, say less than 5 cfsOFor those who desire specific solutions of "Total Interception" for each of the two general types of catch basinsstreets having the characteristics used in the model study,%attached tabulations developed from the model study willsupply the desired answerss Xt should not be assumed, however,under any circumstances, that these answers are applicable tostreets of other crowns and cross sections0LOT:cdBureau of EngineeringCity of Los AngelesStorm Drain Design Division
Bureau of Engineeringcity or Loa An@3108Stoma Drain Design DivisionOFYICE STANDARD NO. 108Supplsmemt No. 1August 1955TABULATION OF TOTAL (1005) IFJZBCEPTIONFor X-5 Type Catch Basin (See Fibte I)On Streeta With Crown HeightMeasured fn FeatH 0.0129Y Where H and W AmTotal rnterceptfon Formula Q On Streets With Crown HeightH P o n25w where PIand W Are Measured im Feet0.924Total Interception Formula Q 0 353Vf
SUPPLEMENT NO. 2OFFICE STANDARD NO. 108SUPPLEKFWTAL INSTRUCLPIONSJULY 17,1959Since the issuance of this Standard, a number ofinstances of impro er application of Catch Basins Nos. 45,4% and 47 with (1t;Standard Catch 13asinOutlet Structure,and (2) Catch Basin Connecting Pipe Size have comaeto ourattention.The efficient of these catch basins is de endentupon the following: (I 7 the improved curb inlet (27 thescientifically shaped catch basin with the propeG value of"V" (depth of basin), (3) the tapered transition sectionbetween the lower end wall of the catch basin and the outletpipe, and (4) a catch basin connecting pipe of proper sizeand slope.The following statements of policy are issued forthe designer's information and guidance:1.Catch Basins Nos. 45, b6, and 4'7. These catchbasins should LL most cases be specifZed with a"Standard C&l; 3ttsinOutlet Structure"(St&-dPlan No. B-3649), with the following exception.When the quantity of water to be intercepted bythe catch basin is less than 10 cfs., the 'StandardCatch Basin Outlet Structure" ma;lbe omitted,providing "V" (depth of catch basin] is 5 feet ormore and "(diameter of catch basin connecting18inchesor greater.ispipeI2.Connecting Pipes. The ;ninimumdiameter forbasin connecting pipe shall.be 18 inches.3 .the curbCurb Face. The effect of increasingt the catch basin from 9 inches to 10 inches,tas been suggested, is as follot\rs:a.-catchfaceasThe catch basin capacity chart values (OfficeStandard Rro.108, Parts I and III) may be increased by approximately i0 per cent for valuesof "Q" greater than those shown in the "Tabulation of Total Interception" (Supplenu3ntNo. 1,dated August 1955). This increase in capacityvaries somewhat with "D" depth of flow In thegutter above the catch basin, "a" slope of thegutter, and "I?"Width of the catch basin opening.When the curb face exceeds 9-kinches, a plainround protection bar 1 inch in diameter is required.
-24.Catch Basins in Series. When one or more connectorpipes inlet i t the catch basin, an outlet chambersimilar to Lot kgeles County Flood Control DistrictDrawing No. 2-D249.2, Section Al-AI, shall be detailedon the improvement plan pending the publication of thenew Outlet Chamber Standard Plan. Designers shouldkeep in mind that loss of head in this Outlet Chamberis greatly increased due to turbulence; therefore,,theoutlet connector pipe from the Outlet Chamber shouldbe 3 inches larger in diameter than that computedusing Figure 1, Chart II, of Part VII, Office StandardNo. 1.08.5.Improvement Plan.-a.The catch basin location (tie to the center lineof the opening on Catch Basin No. 45 or tie tow on Catch Basins Nos. 46 and 471, elevation ofz?the catch basin outlet, anda(delta) of thecurve on Case 2 of the "Catch Basin Outlet Transition Structure'"shall be specified on the improvement plan.b.Dimensions "X" and "Y" for Table A, Case 2,Catch Basin Outlet Transition Structure (StandardPlan No. B-3649) may be computed from the following equations:YzRFJD: cd-(D 12)Tan& sign Division
OFFICEv X-5ISTANOARDCATCH BASINNO 108OPENINGI” DEPRESSEDGUTTERS. VARIESCROWN: H 0.0125RDWY. WIDTHCROSSFALLs0.00q--Y-l-APLANSCALE:1”s 5’A-ASECTIONDETAILBASINOF CATCHOPENINGSCALE:Iwl” i’FIGUREBUREAUIOF ENGiNEERlNGCITY O -LOS ANGELE!DEPARTMEN?OF PUBLIC WORKSSTORM DRAIN DESIGN DIVISION1 W.O. 36079JUNEI954
OFFiCESTANDARDNO 108STANDARD CATCH BASIN OPENINGL.D. NO 3 CASES VARiES,Il.5i 1 STD. PLANC.F AT C.B.CROWN: H 0.0125CROSSFALL 0.00RDWYD- 1993)WIDTHDEPARTMENTOF PUBLICWORKSSTORMDRAiNDES1GNDsVlSIONMARCHSSSS
Office Standard No. 108PART IVDESCRIPTION AND USE OF GRATING CAPACITY CHARTSThese charts represent the results of Hydraulic Modeltests of Standard City gratings (Standard Plan No. B-2523) onhalf of a typical 6C-foot street, 40 feet between curbs, normal8-inch curb face, g-inch curb face at gratings, 2-foot gutters,and height of crown above the outside edge of the gutter .0125 x 36 .45 feet.Hydraulic Model tests indicate that the use of 3/4inch spacers (city Standard Plan No. B-3656 and Des AngelesCounty Flood Control District Drawing No, 2-D227) instead ofl-inch spacers on grating catch basins will Ireducethe interception capacity by as much as 5 per cent,when the grate orgrates are clean and completely covered with water. When thegrate or grates are only partially covered, no reduction in lnterception will occur.In using these cl‘iialats,consideration must be given tothe fact that gratings have a tendency ta clog with debris, suchas leaves and paper, and the interception capacities indicatedare, therefore, the maximum which can be anticipated. The lowerend of each curve indicates "Total Interception" for the slopeand grating(s) referred to.FJD:cdh-25-57
OFFICE-FLOW STANDARDNO 108( CONCRETEF.GUTTERGRATING 8 ONBASIN)NOTESI.THISCHARTOF DPLAN NO B-2523)DEVELOPEDRAULIC YODEL STUDIESFOR2.OF “IfON THETHISCHARTDITIONSSHOWNINDICATEDSLOPE.IS APPLICABLEONTHEFROM HYDVARIOUSVALUESONLYABOVETO CON-SKETCH.i--q-q-iDESIGNCHARTLL-18GRATBNG CAPACITIES: !iDESIGNED BY : FJ.D. & W.H.T. DRAWN BY : 0.G.S2D OFPTH13.4OF FLOW (FTII5ADOVE,.6IJ1 I.8 .9NORMAL,1.0GUTTERI1.5GRADE
OFFICESTANDARDNO 108NOTESI.THISCHARTOF STANOAROPLANRAULICPLAN2.THISDITIONS fy---J-:-T:----f- CONC. CITYGRATlNGS(STANDARONO B-2323)DEVELOPEDMODEL. STUDIESOF “D*ONGRATING 8 GUTTERGIVESTHECHARTFORINDlCAiEQISSHOWNOevllY TO :I I ,.‘.:::::I,,iI‘-jj i: ,;!,I:T- ,I ,/, ,,.(M DRAlND DEPTHOF FLOW (FT)ABOVENORMALDESkNHYOVALUESLOPE.APPCICAIILEON -7%,FROMVARIOUSDiVJSlONGUTTER.GBADF
--NOTESI. THISCHARTOF STANDAROPLANGIVESGRATINGCITYGRATINGSNO B-2523)CAPACITIES(STANDARDDEVELOPEDFROMRAULIC MODEL STUDIESFOR VARIOUSOF “D’*DN ?tiE INDICATEDSLOPE.GRATING & GUTTERPLAN2.3.HYDVALUE:THIS CHAWTIS APPLICABLEONLY TO CONDITICWSSHOWN ON THE ABOVE EFROMOF THETHEH BEAMWORKSDEi ARTMENTOF PUBLiCSTORM DRAIN DESIGNDi’VlSlONMARCH,195
OFFKESTANDARDNO TANDARDTHISGRATINGCIYYGRATINGSNO 8-2523)YODELOF “d’ ON INDICATED(Lo’. - -HYDRAULICSUPPORtING-.CONC.GUTTE- -IflYEFWERf)cCETHEWYDVALUESSLOPE.IS APPLICABLEONLYDITIONSSHOWN ON THE ABOVE3, THIS IRREOULARITYRESULYS.----FROMFOR VARlOUSA0JOWIWGTO CON-SKETCH.FROM YHEOF OWE H WEAMG AY GS.
OFFICE STANDARD NO. 1.08PART VIIDESCRIR'IONAND USEOFCATCH BASIN CONNBXI!?‘&PJ?ECAPACITY CHARTSTheee charts were developed from original studiesWnducted by the Bureau of Engfneerlngin its ExperimentaltiydrcLuPicLaboratoryand apply specificallyto Catch Basinsand 47 developedby the Laboratory,combined withNOti. 45,46,8ttandard"Catch BaeSn Outlet Transition Structure"also de-velopedbytheThaseLaboratcwy.‘Yl3-mHydr l atudieis,QF culverte”t&t?by F,L5dngT.connectingMavlsSi: steCollege, Engineeringtion eriee lekxi8etin No. 56).of Yhoft Pipegs- EiydratificConnecJohn L. Frencht2on CommonlyU ed Pipe Entx%.n@bs,"(N&Mona1 Burn& of StmdazdsReport No. 4444).“Hydraul3.c CH,ARTI ie basedbasinon the hypothesis that the catchpipe flowfsentirelyconnectingfulL,and for a givenelevation between the headwater and tailwater levels.CHART IImum dischargelabased on the hypoxesls that the maxi-of the c;atchbasin connectingpipe is controlledat tha inlet and ie a fusncticrnaboveinletinvertof “H”/“d”(headwaterdepthand diameter of the catch basin connecting
-2-pm)thelFigure2 of Chart II gives a elements.3 of .Chart II shows comparativecurvesof” Control at Inlet" discharge for (1) Square-edgeinlet (Mavis); (2) Rounded inlet, r 0.25 d (French);and(3) City of Los AngelesBasinsNos.45,46,Designfrom CatchCurve developedand 47 in conjunctionwith "Catch BasinOutlet Transition Structure."LJZGEND;;ag;;r of catch basin connectingpipe,freeboard (tic:pthof water surface in catchbasin below gutter).acaslerationdifferencetailwate3?due to gravity 32.16.in elevationof headwaterlevels,in feet.andheight of water in catch basin above invertof outlet pipe, in feet.hv a velocityL ralengthfeet.head v2/2g’of catch basin connectingQ dischargepipe,inin second feet.V P depth of catch basin (differencein elevation between top of curb and catch basinoutlet). (- H f curb face)v hiaverage velocity in feet per second.1.DIsCUSSIONa.A catch basin connectingpipe may flow either fullor partly full, dependingupon the specific hydraulic conditions
-3under which it must operate.In part-full flow, the pipebehaves as an open channel with a free surface.In full-flow, the hydraulic gradient does not necessarily coincidewith the soffit of the pipe. The headwater level, however,must be above the soffit of the pipe a distance of at leastequal to the velocity head.The complete range of hydraulicrelationships, between discharge and head on the catch basinconnecting pipe, includes both full-flow and part-full conditions.b.When a catch basin connecting pipe is short, theflow characteristics which are knfiuonced by the length becomecomparatively unimportantyCon F‘::ciue:,v!tly,the control sectionis essentially at the Lnlet for a.i.1conditions. Between thepart-full phase and full-flow phase, there is a transitionzone of pulsating flow in which the pipe is alternately fulland partly full. This condition exists when the dischargefrom "K"/"d" and "h" are identicalI)Chart II, when used in connection with Chart I,C.takes into consideration the complete range of hydraulic relationships from a practical standpoint under average fieldconditions, and gives the required "Ii"for a specified "Q"and "d" from which a tinimum "V" may be readily determinedby the addition of the 6-inch value of "f" and the g-inchcurb face.d.As previously stated, the maximum discharge capacityof the catch basin connecting pipe may be a function of either
-4-"h" or "H"/"d." The discharge, using "h", may be less than,or equal to, but never greater than, that obtained from using"H"/,'d" .After computing the discharge using "h" and "H"/"d",select the smaller of the two values as the design capacityof the catch basin connecting pige.2.GENERAL RULESThe following general rules are intended for use asa guide in determining values of "d" and "V" when used inconnection with Catch Basin Nos. 45,46,and 47 combined withstandard "Catch Basin Outlet Transition Structure."(See Fig.1, Chart I and Fig. 2, Chart II for typical layout.)a.Water surface (W.S.) elevation in the catch basinshould not be less than 6 inches below the gutter.b.Soffit elevation of the upstream end of the "CatchBasin Outlet Transition Structure" should not be less than 6inches below the gutter.c.The minimum "V" (depth of catch basin) is deter-mined as follows:(1)For full pipes, Chart I"V" d h, 6” 9” or d
instances of impro er application of Catch Basins Nos. 45, 4% and 47 with (1 t; Standard Catch 13asin Outlet Structure, and (2) Catch Basin Connecting Pipe Size have comae to our attention. The efficient of these catch basins is de endent
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Civil Engineering 30 Computer Systems Engineering 32 Engineering Science 34 Electrical and Electronic Engineering 36 Mechanical Engineering 38 Mechatronics Engineering 40 Software Engineering 42 Structural Engineering 44 Course descriptions 46 APPENDIX 84 Find out more 88. 2 Dates to remember 06 Jan Summer School begins 12 Jan Last day to add, change or delete Summer School Courses 01 Feb .
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