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1998-5837 G/CN/PM ___'81'19 Category '/Pm 11/ i/s Name Plan c1<. # Street Address I ,~,)Cc! Serial # Description Year . HYDROLOGY STUDY OF BUKAMIER PARCEL MAP CITY OF ENCINITAS TPM 97-215 PREPARED FOR: GARY L. BUKAMIER 4645 E. BRYSON STREET ANAHEIM, CALIFORNIA 92807 PREPARED BY: PASCO ENGINEERING 535 N. HIGHWAY 101 SUITE A SOLANA BEACH, CALIF. 92075 (619) 259-8212 DECEMBER 23, 1998 PE 732F ~)~.>- ;?~ WAYNE PASCO, RC 9577 . a ,<; '...- '; ~J \ L. __.___..---:.~..__.~:.~ "';' ':::[;:5 i3"C;:j"{- OF~,;{j:{i-(A~ ~~ L :Y I/Z! ~1 I \<\TE · SECTION 1 · SECTION 2 · SECTION 3 . . TABLE OF CONTENTS HYDROLOGY CALCULATIONS REFERENCE MATERIALS SITE DRAINAGE/NODE MAP . . SECTION 1 PROPOSED HYDROLOGY CALCULATIONS . . **************************************************************************** RATIONAL METHOD HYDROLOGY COMPUTER PROGRAM PACKAGE Reference: SAN DIEGO COUNTY FLOOD CONTROL DISTRICT 1985,1981 HYDROLOGY MANUAL (c) Copyright 1982-92 Advanced Engineering Software (aes) Ver. 1.3A Release Date: 3/06/92 License ID 1388 Analysis prepared by: Pasco Engineering, Inc. 535 Norht Hwy. 101, Suite A Solana Beach, CA 92075 Ph. (619) 259-8212 Fax (619) 259-4812 ************************** DESCRIPTION OF STUDY ************************** , BUKAMIER GRADING PLAN , TPM 97-215 , 8/24/98 , , ************************************************************************** , FILE NAME: 732-1.DAT TIME/DATE OF STUDY: 12:50 8/24/1998 ---------------------------------------------------------------------------- USER SPECIFIED HYDROLOGY AND HYDRAULIC MODEL INFORMATION: ---------------------------------------------------------------------------- 1985 SAN DIEGO MANUAL CRITERIA USER SPECIFIED STORM EVENT (YEAR) = 100.00 6-HOUR DURATION PRECIPITATION (INCHES) = 5.120 SPECIFIED MINIMUM PIPE SIZE (INCH) = 12.00 SPECIFIED PERCENT OF GRADIENTS(DECIMAL) TO USE FOR FRICTION SLOPE .95 SAN DIEGO HYDROLOGY MANUAL "C" -VALUES USED NOTE: CONSIDER ALL CONFLUENCE STREAM COMBINATIONS FOR ALL DOWNSTREAM ANALYSES **************************************************************************** FLOW PROCESS FROM NODE 1. 00 TO NODE 1.10 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< ============================================================================ SOIL CLASSIFICATION IS "D" RURAL DEVELOPMENT RUNOFF COEFFICIENT = .4500 INITIAL SUBAREA FLOW-LENGTH = 165.00 UPSTREAM ELEVATION = 493.70 DOWNSTREAM ELEVATION = 483.70 ELEVATION DIFFERENCE = 10.00 URBAN SUBAREA OVERLAND TIME OF FLOW(MINUTES) = 8.244 'CAUTION: SUBAREA SLOPE EXCEEDS COUNTY NOMOGRAPH DEFINITION. EXTRAPOLATION OF NOMOGRAPH USED. 100 YEAR RAINFALL INTENSITY (INCH/HOUR) = 9.771 SUBAREA RUNOFF(CFS) = .44 TOTAL AREA (ACRES) = .10 TOTAL RUNOFF (CFS) = .44 . . *******************************************************--**-**-*****-******* FLOW PROCESS FROM NODE 1.00 TO NODE 1. 10 IS CODE = 1 ------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< ============================================================================ TOTAL NUMBER OF STREAMS = 3 CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE: TIME OF CONCENTRATION(MIN.) 8.24 RAINFALL INTENSITY (INCH/HR) = 9.77 TOTAL STREAM AREA(ACRES) = .10 PEAK FLOW RATE(CFS) AT CONFLUENCE = .44 ****_xx*******___*_***__***_******_**__*_****************__*_*__*.***.*_***_ FLOW PROCESS FROM NODE 2.00 TO NODE 1.10 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< ============================================================================ SOIL CLASSIFICATION IS "D" RURAL DEVELOPMENT RUNOFF COEFFICIENT = .4500 INITIAL SUBAREA FLOW-LENGTH = 220.00 UPSTREAM ELEVATION = 485.00 DOWNSTREAM ELEVATION = 483.70 ELEVATION DIFFERENCE = 1.30 URBAN SUBAREA OVERLAND TIME OF FLOW (MINUTES) 20.680 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 5.399 SUBAREA RUNOFF (CFS) = .73 TOTAL AREA(ACRES) = .30 TOTAL RUNOFF(CFS) = .73 x_x*__*x***_*___****_**____*_**___*_*_**___**_**_***__**x._*___***_**_*_***_ FLOW PROCESS FROM NODE 2.00 TO NODE 1.10 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< ============================================================================ TOTAL NUMBER OF STREAMS = 3 CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE: TIME OF CONCENTRATION(MIN.) 20.68 RAINFALL INTENSITY (INCH/HR) = 5.40 TOTAL STREAM AREA (ACRES) = .30 PEAK FLOW RATE(CFS) AT CONFLUENCE = .73 **************************************************************************** FLOW PROCESS FROM NODE 2.30 TO NODE 1.10 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< ============================================================================ SOIL CLASSIFICATION IS "D" RURAL DEVELOPMENT RUNOFF COEFFICIENT = .4500 INITIAL SUBAREA FLOW-LENGTH = 210.00 UPSTREAM ELEVATION = 485.00 DOWNSTREAM ELEVATION = 483.70 ELEVATION DIFFERENCE = 1.30 URBAN SUBAREA OVERLAND TIME OF FLOW (MINUTES) 19.894 100 YEAR RAINFALL INTENSITY (INCH/HOUR) 5.536 SUBAREA RUNOFF(CFS) = .55 . TOTAL AREA (ACRES) . .22 TOTAL RUNOFF(CFS) .55 FLOW PROCESS FROM NODE **************************************************************************** 1 2.30 TO NODE 1. 10 IS CODE ; ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< >>>>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<<<<< ============================================================================ TOTAL NUMBER OF STREAMS; 3 CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 3 ARE: TIME OF CONCENTRATION(MIN.) ; 19.89 RAINFALL INTENSITY (INCH/HR) ; 5.54 TOTAL STREAM AREA (ACRES) ; .22 PEAK FLOW RATE(CFS) AT CONFLUENCE; .55 ** CONFLUENCE DATA ** STREAM RUNOFF NUMBER (CFS) 1 .44 2 .73 3 .55 Tc (MIN. ) 8.24 20.68 19.89 INTENSITY (INCH/HOUR) 9.771 5.399 5.536 AREA (ACRE) .10 .30 .22 RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO CONFLUENCE FORMULA USED FOR 3 STREAMS. ** PEAK STREAM NUMBER 1 2 3 FLOW RATE RUNOFF (CFS) 1.15 1.51 1.51 TABLE ** Tc (MIN.) 8.24 19.89 20.68 COMPUTED CONFLUENCE PEAK FLOW RATE(CFS) TOTAL AREA (ACRES) ; INTENSITY ( INCH/HOUR) 9.771 5.536 5.399 ESTIMATES ARE 1.51 .62 19.89 AS FOLLOWS: Tc (MIN.) ; FLOW PROCESS FROM NODE **************************************************************************** 4.10 IS CODE; 21 4.00 TO NODE ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< ============================================================================ SOIL CLASSIFICATION IS "D" RURAL DEVELOPMENT RUNOFF COEFFICIENT; .4500 INITIAL SUBAREA FLOW-LENGTH; 85.00 UPSTREAM ELEVATION; 485.00 DOWNSTREAM ELEVATION; 482.70 ELEVATION DIFFERENCE; 2.30 URBAN SUBAREA OVERLAND TIME OF FLOW (MINUTES) ; 7.741 *CAUTION: SUBAREA SLOPE EXCEEDS COUNTY NOMOGRAPH DEFINITION. EXTRAPOLATION OF NOMOGRAPH USED. 100 YEAR RAINFALL INTENSITY (INCH/HOUR) ; 10.176 SUBAREA RUNOFF(CFS) .50 TOTAL AREA(ACRES) ; .11 TOTAL RUNOFF(CFS) ; .50 . . **************************************************************************** FLOW PROCESS FROM NODE 4.00 TO NODE 4.10 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< ============================================================================ TOTAL NUMBER OF STREAMS = 2 CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE: TIME OF CONCENTRATION(MIN.) = 7.74 RAINFALL INTENSITY (INCH/HR) = 10.18 TOTAL STREAM AREA (ACRES) = .11 PEAK FLOW RATE(CFS) AT CONFLUENCE = .50 **************************************************************************** FLOW PROCESS FROM NODE 4 . 20 TO NODE 4.10 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< ============================================================================ SOIL CLASSIFICATION IS "D" RURAL DEVELOPMENT RUNOFF COEFFICIENT = .4500 INITIAL SUBAREA FLOW-LENGTH = 210.00 UPSTREAM ELEVATION = 485.00 DOWNSTREAM ELEVATION = 482.70 ELEVATION DIFFERENCE = 2.30 URBAN SUBAREA OVERLAND TIME OF FLOW (MINUTES) 16.449 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 6.258 SUBAREA RUNOFF(CFS) = .56 TOTAL AREA (ACRES) = .20 TOTAL RUNOFF(CFS) = .56 **************************************************************************** FLOW PROCESS FROM NODE 4.20 TO NODE 4.10 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< >>>>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<<<<< ============================================================================ TOTAL NUMBER OF STREAMS = 2 CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE: TIME OF CONCENTRATION(MIN.) 16.45 RAINFALL INTENSITY (INCH/HR) = 6.26 TOTAL STREAM AREA (ACRES) = .20 PEAK FLOW RATE(CFS) AT CONFLUENCE = .56 .. CONFLUENCE DATA .. STREAM RUNOFF NUMBER (CFS) 1 .50 2 .56 Tc (MIN.) 7.74 16.45 INTENSITY (INCH/HOUR) 10.176 6.258 AREA (ACRE) .11 .20 RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO CONFLUENCE FORMULA USED FOR 2 STREAMS. ** PEAK STREAM NUMBER 1 2 FLOW RATE RUNOFF (CFS) .85 .87 TABLE ** Tc (MIN.) 7.74 16.45 INTENSITY ( INCH/HOUR) 10.176 6.258 . . COMPUTED CONFLUENCE PEAK FLOW RATE(CFS) TOTAL AREA (ACRES) = ESTIMATES ARE .87 .31 AS FOLLOWS: TC (MIN.) = 16.45 **************************************************************************** FLOW PROCESS FROM NODE 4.10 TO NODE 4.30 IS CODE = 51 ------------------------------------------------------- >>>>>COMPUTE TRAPEZOIDAL CHANNEL FLOW<<<<< >>>>>TRAVELTIME THRU SUBAREA<<<<< --------------------- ============================================================================ UPSTREAM NODE ELEVATION = 482.70 DOWNSTREAM NODE ELEVATION = 477.80 CHANNEL LENGTH THRU SUBAREA (FEET) = 70.00 CHANNEL SLOPE = .0700 CHANNEL BASE(FEET) = .30 "Z" FACTOR = 2.000 MANNING'S FACTOR = .015 MAXIMUM DEPTH(FEET) = .70 CHANNEL FLOW THRU SUBAREA(CFS) = .87 FLOW VELOCITY(FEET/SEC) 6.18 FLOW DEPTH(FEET) = .20 TRAVEL TIME(MIN.) = .19 TC(MIN.) = 16.64 **************************************************************************** FLOW PROCESS FROM NODE 4.10 TO NODE 4.30 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< ============================================================================ TOTAL NUMBER OF STREAMS = 3 CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE: TIME OF CONCENTRATION(MIN.) 16.64 RAINFALL INTENSITY(INCH/HR) = 6.21 TOTAL STREAM AREA (ACRES) = .31 PEAK FLOW RATE(CFS) AT CONFLUENCE = .87 **************************************************************************** FLOW PROCESS FROM NODE 4.40 TO NODE 4.30 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< ============================================================================ SOIL CLASSIFICATION IS "D" RURAL DEVELOPMENT RUNOFF COEFFICIENT = .4500 INITIAL SUBAREA FLOW-LENGTH = 145.00 UPSTREAM ELEVATION = 485.00 DOWNSTREAM ELEVATION = 477.80 ELEVATION DIFFERENCE = 7.20 URBAN SUBAREA OVERLAND TIME OF FLOW (MINUTES) = 8.259 .CAUTION: SUBAREA SLOPE EXCEEDS COUNTY NOMOGRAPH DEFINITION. EXTRAPOLATION OF NOMOGRAPH USED. 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 9.760 SUBAREA RUNOFF(CFS) .61 TOTAL AREA(ACRES) = .14 TOTAL RUNOFF(CFS) .61 **************************************************************************** FLOW PROCESS FROM NODE 4.40 TO NODE 4.30 IS CODE = 1 . . --------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< ============================================================================ TOTAL NUMBER OF STREAMS = 3 CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE: TIME OF CONCENTRATION(MIN.) 8.26 RAINFALL INTENSITY(INCH/HR) = 9.76 TOTAL STREAM AREA (ACRES) = .14 PEAK FLOW RATE(CFS) AT CONFLUENCE = .61 FLOW PROCESS FROM NODE **************************************************************************** 4.30 IS CODE = 21 4.50 TO NODE ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< ============================================================================ SOIL CLASSIFICATION IS "D" RURAL DEVELOPMENT RUNOFF COEFFICIENT = .4500 INITIAL SUBAREA FLOW-LENGTH = 200.00 UPSTREAM ELEVATION = 480.00 DOWNSTREAM ELEVATION = 477.80 ELEVATION DIFFERENCE = 2.20 URBAN SUBAREA OVERLAND TIME OF FLOW (MINUTES) 16.029 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 6.363 SUBAREA RUNOFF (CFS) = .72 TOTAL AREA(ACRES) = .25 TOTAL RUNOFF(CFS) = .72 FLOW PROCESS FROM NODE **************************************************************************** 1 4.50 TO NODE 4.30 IS CODE = ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< >>>>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<<<<< ============================================================================ TOTAL NUMBER OF STREAMS = 3 CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 3 ARE: TIME OF CONCENTRATION(MIN.) 16.03 RAINFALL INTENSITY(INCH/HR) = 6.36 TOTAL STREAM AREA (ACRES) = .25 PEAK FLOW RATE(CFS) AT CONFLUENCE = .72 ** CONFLUENCE DATA ** STREAM RUNOFF NUMBER (CFS) 1 .85 1 .87 2 .61 3 .72 Tc (MIN. ) 7.93 16.64 8.26 16.03 INTENSITY (INCH/HOUR) 10.021 6.212 9.760 6.363 AREA (ACRE) .31 .31 .14 .25 RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO CONFLUENCE FORMULA USED FOR 3 STREAMS. * * PEAK STREAM NUMBER 1 2 FLOW RATE RUNOFF (CFS) 1. 90 1. 91 TABLE ** Tc (MIN. ) 7.93 8.26 INTENSITY (INCH/HOUR) 10.021 9.760 . . 3 4 1. 97 1. 96 16.03 16.64 6.363 6.212 COMPUTED CONFLUENCE PEAK FLOW RATE(CFS) TOTAL AREA (ACRES) = ESTIMATES ARE 1. 97 .70 AS FOLLOWS: Tc(MIN.) = 16.03 **************************************************************************** FLOW PROCESS FROM NODE 4.30 TO NODE 4.60 IS CODE = 51 ---------------------------------------------------------------------------- >>>>>COMPUTE TRAPEZOIDAL CHANNEL FLOW<<<<< >>>>>TRAVELTIME THRU SUBAREA<<<<< ============================================================================ UPSTREAM NODE ELEVATION = 477.80 DOWNSTREAM NODE ELEVATION = 469.00 CHANNEL LENGTH THRU SUBAREA (FEET) = 95.00 CHANNEL SLOPE = .0926 CHANNEL BASE(FEET) = .30 "Z" FACTOR = 2.000 MANNING'S FACTOR = .015 MAXIMUM DEPTH(FEET) = .70 CHANNEL FLOW THRU SUBAREA(CFS) = 1.97 FLOW VELOCITY(FEET/SEC) = 8.59 FLOW DEPTH(FEET) = .27 TRAVEL TIME(MIN.) = .18 TC(MIN.) = 16.21 **************************************************************************** FLOW PROCESS FROM NODE 5.10 TO NODE 5.20 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< ============================================================================ SOIL CLASSIFICATION IS "D" RURAL DEVELOPMENT RUNOFF COEFFICIENT = .4500 INITIAL SUBAREA FLOW-LENGTH = 165.00 UPSTREAM ELEVATION = 485.00 DOWNSTREAM ELEVATION = 477.70 ELEVATION DIFFERENCE = 7.30 URBAN SUBAREA OVERLAND TIME OF FLOW(MlNUTES) 9.155 'CAUTION: SUBAREA SLOPE EXCEEDS COUNTY NOMOGRAPH DEFINITION. EXTRAPOLATION OF NOMOGRAPH USED. 100 YEAR RAINFALL INTENSITY (INCH/HOUR) = 9.132 SUBAREA RUNOFF(CFS) 1.23 TOTAL AREA (ACRES) = .30 TOTAL RUNOFF(CFS) 1.23 **************************************************************************** FLOW PROCESS FROM NODE 5.10 TO NODE 5.20 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< ============================================================================ TOTAL NUMBER OF STREAMS = 2 CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE: TIME OF CONCENTRATION(MIN.) 9.16 RAINFALL INTENSITY(INCH/HR) = 9.13 TOTAL STREAM AREA (ACRES) = .30 PEAK FLOW RATE(CFS) AT CONFLUENCE = 1.23 . . **************************************************************************** FLOW PROCESS FROM NODE 5.30 TO NODE 5.20 IS CODE = 21 --------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< ============================================================================ SOIL CLASSIFICATION IS "D" RURAL DEVELOPMENT RUNOFF COEFFICIENT = .4500 INITIAL SUBAREA FLOW-LENGTH = 210.00 UPSTREAM ELEVATION = 480.00 DOWNSTREAM ELEVATION = 477.70 ELEVATION DIFFERENCE = 2.30 URBAN SUBAREA OVERLAND TIME OF FLOW(MlNUTES) 16.449 100 YEAR RAINFALL INTENSITY (INCH/HOUR) = 6.258 SUBAREA RUNOFF (CFS) = .56 TOTAL AREA (ACRES) = .20 TOTAL RUNOFF(CFS) = .56 **************************************************************************** FLOW PROCESS FROM NODE 5 . 30 TO NODE 5.20 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< >>>>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<<<<< ============================================================================ TOTAL NUMBER OF STREAMS = 2 CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE: TIME OF CONCENTRATION(MIN.) 16.45 RAINFALL INTENSITY(INCH/HR) = 6.26 TOTAL STREAM AREA (ACRES) = .20 PEAK FLOW RATE(CFS) AT CONFLUENCE = .56 ** CONFLUENCE DATA ** STREAM RUNOFF NUMBER (CFS) 1 1. 23 2 .56 Tc (MIN. ) 9.16 16.45 INTENSITY ( INCH/HOUR) 9.132 6.258 AREA (ACRE) .30 .20 RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO CONFLUENCE FORMULA USED FOR 2 STREAMS. ** PEAK STREAM NUMBER 1 2 FLOW RATE RUNOFF (CFS) 1.62 1.41 TABLE ** Tc (MIN.) 9.16 16.45 INTENSITY (INCH/HOUR) 9.132 6.258 COMPUTED CONFLUENCE PEAK FLOW RATE(CFS) TOTAL AREA (ACRES) = ESTIMATES ARE 1. 62 .50 AS FOLLOWS: Tc(MIN.) = 9.16 **************************************************************************** FLOW PROCESS FROM NODE 5 . 20 TO NODE 5.40 IS CODE ~ 51 ---------------------------------------------------------------------------- >>>>>COMPUTE TRAPEZOIDAL CHANNEL FLOW<<<<< >>>>>TRAVELTIME THRU SUBAREA<<<<< ============================================================================ UPSTREAM NODE ELEVATION = 477.70 . . DOWNSTREAM NODE ELEVATION = 467.00 CHANNEL LENGTH THRU SUBAREA (FEET) = 185.00 CHANNEL SLOPE = .0578 CHANNEL BASE(FEET) = .30 "Z" FACTOR = 2.000 MANNING'S FACTOR = .015 MAXIMUM DEPTH(FEET) = .70 CHANNEL FLOW THRU SUBAREA(CFS) = 1.62 FLOW VELOCITY(FEET/SEC) = 6.82 FLOW DEPTH(FEET) .28 TRAVEL TIME(MIN.) = .45 TC(MIN.) = 9.61 ***.**....*...*....*..*...*.......*..*.......**.**....**x.*......*..*.....** FLOW PROCESS FROM NODE 3.00 TO NODE 3.10 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< ============================================================================ SOIL CLASSIFICATION IS "D" RURAL DEVELOPMENT RUNOFF COEFFICIENT = .4500 INITIAL SUBAREA FLOW-LENGTH = 270.00 UPSTREAM ELEVATION = 494.30 DOWNSTREAM ELEVATION = 487.60 ELEVATION DIFFERENCE = 6.70 URBAN SUBAREA OVERLAND TIME OF FLOW(MINUTES) = 14.201 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 6.880 SUBAREA RUNOFF (CFS) .62 TOTAL AREA (ACRES) = .20 TOTAL RUNOFF(CFS) = .62 **x......**.....*....**.*.*..*.............*...***.*..**x......*...........* FLOW PROCESS FROM NODE 3.10 TO NODE 6.20 IS CODE = 51 ---------------------------------------------------------------------------- >>>>>COMPUTE TRAPEZOIDAL CHANNEL FLOW<<<<< >>>>>TRAVELTIME THRU SUBAREA<<<<< ============================================================================ UPSTREAM NODE ELEVATION = 487.60 DOWNSTREAM NODE ELEVATION = 483.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 11.00 CHANNEL SLOPE = .4182 CHANNEL BASE(FEET) = .30 "Z" FACTOR = 2.000 MANNING'S FACTOR = .015 MAXIMUM DEPTH (FEET) = .70 CHANNEL FLOW THRU SUBAREA(CFS) = .62 FLOW VELOCITY (FEET/SEC) = 10.87 FLOW DEPTH(FEET) = .11 TRAVEL TIME(MIN.) = .02 TC(MIN.) = 14.22 ******************-*************************************x..*.*....*......... FLOW PROCESS FROM NODE 3.10 TO NODE 6.20 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< ============================================================================ TOTAL NUMBER OF STREAMS = 2 CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE: TIME OF CONCENTRATION(MIN.) 14.22 RAINFALL INTENSITY(INCH/HR) = 6.87 TOTAL STREAM AREA (ACRES) = .20 PEAK FLOW RATE(CFS) AT CONFLUENCE = .62 . . **************************************************************************** FLOW PROCESS FROM NODE 6.30 TO NODE 6.20 IS CODE = 21 ----------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< ----------------- ============================================================================ SOIL CLASSIFICATION IS "D" RURAL DEVELOPMENT RUNOFF COEFFICIENT = .4500 INITIAL SUBAREA FLOW-LENGTH = 95.00 UPSTREAM ELEVATION = 490.00 DOWNSTREAM ELEVATION = 483.00 ELEVATION DIFFERENCE = 7.00 URBAN SUBAREA OVERLAND TIME OF FLOW (MINUTES) 5.861 .CAUTION: SUBAREA SLOPE EXCEEDS COUNTY NOMOGRAPH DEFINITION. EXTRAPOLATION OF NOMOGRAPH USED. 100 YEAR RAINFALL INTENSITY (INCH/HOUR) = 12.176 SUBAREA RUNOFF (CFS) .33 TOTAL AREA (ACRES) = .06 TOTAL RUNOFF (CFS) .33 **************************************************************************** FLOW PROCESS FROM NODE 6.30 TO NODE 6.20 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< >>>>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<<<<< ============================================================================ TOTAL NUMBER OF STREAMS = 2 CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE: TIME OF CONCENTRATION(MIN.) 5.86 RAINFALL INTENSITY(INCH/HR) = 12.18 TOTAL STREAM AREA (ACRES) = .06 PEAK FLOW RATE(CFS) AT CONFLUENCE = .33 .. CONFLUENCE DATA .. STREAM RUNOFF NUMBER (CFS) 1 .62 2 .33 Tc (MIN. ) 14.22 5.86 INTENSITY ( INCH/HOUR) 6.875 12.176 AREA (ACRE) .20 .06 RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO CONFLUENCE FORMULA USED FOR 2 STREAMS. ** PEAK STREAM NUMBER 1 2 FLOW RATE RUNOFF (CFS) .68 .80 TABLE ** Tc (MIN.) 5.86 14.22 INTENSITY (INCH/HOUR) 12.176 6.875 COMPUTED CONFLUENCE PEAK FLOW RATE(CFS) TOTAL AREA(ACRES) = ESTIMATES ARE .80 .26 AS FOLLOWS: Tc (MIN.) = 14.22 **************************************************************************** FLOW PROCESS FROM NODE 6.20 TO NODE 6.10 IS CODE = 6 ---------------------------------------------------------------------------- >>>>>COMPUTE STREETFLOW TRAVELTIME THRU SUBAREA<<<<< ============================================================================ . . UPSTREAM ELEVATION = STREET LENGTH(FEET) = STREET HALFWIDTH(FEET) 483.00 575.00 = 16.00 DOWNSTREAM ELEVATION = CURB HEIGHT (INCHES) = 6. 428.00 DISTANCE FROM CROWN TO CROSS FALL GRADEBREAK 1.00 INTERIOR STREET CROSSFALL(DECIMAL) = .020 OUTSIDE STREET CROSSFALL(DECIMAL) .020 SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF 1 **TRAVELTIME COMPUTED USING MEAN FLOW(CFS) 1.44 STREETFLOW MODEL RESULTS: STREET FLOWDEPTH(FEET) = .20 HALFSTREET FLOODWIDTH(FEET) = 3.77 AVERAGE FLOW VELOCITY(FEET/SEC.) 5.53 PRODUCT OF DEPTH&VELOCITY = 1.12 STREETFLOW TRAVELTIME(MIN) = 1.73 TC(MIN) = 15.95 100 YEAR RAINFALL INTENSITY (INCH/HOUR) = 6.384 SOIL CLASSIFICATION IS "D" RURAL DEVELOPMENT RUNOFF COEFFICIENT = .4500 SUBAREA AREA (ACRES) = .44 SUBAREA RUNOFF(CFS) 1.26 SUMMED AREA(ACRES) = .70 TOTAL RUNOFF(CFS) = 2.07 END OF SUBAREA STREETFLOW HYDRAULICS: DEPTH (FEET) = .24 HALFSTREET FLOODWIDTH(FEET) = 5.58 FLOW VELOCITY(FEET/SEC.) = 4.82 DEPTH*VELOCITY = 1.15 ** PEAK FLOW RATE TABLE ** STREAM RUNOFF Tc NUMBER (CFS) (MIN.) 1 2.69 7.75 2 2.07 15.95 NEW PEAK FLOW DATA ARE: PEAK FLOW RATE(CFS) = 2.69 Tc(MIN.) = 7.75 ============================================================================ END OF STUDY SUMMARY: PEAK FLOW RATE(CFS) = 2.69 TOTAL AREA(ACRES) = .70 *** PEAK FLOW RATE TABLE *** Q(CFS) Tc(MIN.) 1 2.69 7.75 2 2.07 15.95 Tc (MIN.) = 7.75 ============================================================================ END OF RATIONAL METHOD ANALYSIS . SECTION 2 REFERENCE MATERIALS . .."~ r" ,. . I I I " . [: , .. ; \ . t. (~.. . . TABLE 2 RUNOFF COEFFICIENTS (RATIONAL METHOO) NOTES: ( (I) Soil Group maps are available at the .offices of the Department of Public Works. (2)Where actual conditions deviate significantly from the tabulated impervious- ness values of 8~4 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 soilcgroup. Actual imperviousness a 50% Tabulated imperviousness a 8~4 Revised C a 50 X 0.85 a 0.53 80 IV-A-9 APPENDIX IX-B Rev. S/8l . EGil/1T/OAl (/I.3L J) .385 Tc . 1-/ lC' l/i71~ or cO/7c~/7lra.liO/1 L. L~n9lh 01 wa/~r...;'~d II' "1/I'~r~/7ce In ~/~vah~n a/OI1!7 ~/I'..dIY" slo.oe! lin.. (St!t! ~pe!l7mx Y.B) J:, L C Mi/~5 F~..r #0<1....0$ MihVI..s 4 Uo ~() " StJM , t/~() to "- /8 JOIJO "- /G " # "- 2000 "- 12 1800 "- /600 /0 It/tJO 9 / 12tJtJ 8 1000 7 900 800 G 700 6tJO .5 SO(J 4- ~tJtJ .3 1-/ Feel 50tJo 4-(J00 3000 2pp(J ItJ " Ipllp -, 900 800 700 GOO" "- 5' tJ() "- 100 ~ ,,~ "-~~ "- "- "- "- "- "- "- / s 3tJtJ 2IJO /170 50 as ItJ JIJ NOTE ;FORNATIiRALWATERSHEii~ to R ADD TEN MINUTES TO !p I COMPUTED TIME OF CON- CE~2- ==-~---h /0 5 r H L SAN DIEGO COUNTY DEPARTMENT OF SPECIAL DISTRICT SERVICES DE SIGN MANUAL APPROVED ,:J,/';'/~~~ 4 J 2 . ..] 18IJ 2 120 / /170 ~O 8tJ 7tJ 60 5'tJ ~o 200 ~ NOMOGRAPH FOR DETERM I NAHON , OF TIME OF CONCENTRATION (Tel FOR NATURAL WATERSHEDS DATE /2/1/6 J APPENDIX X-A V-A-IO Rev. 5/81 ~'-' i N co en ~ -- --- ... >,.<: . $... C:..... ... ... 0 0.... .<: 0 "<:I ~c:: "'0 ..... .... c:: - 0._ ... ... '" >.$... ~~~ "<:I 0 ... .... U"<:I"<:I >,ll'l.a .~ ..... > 0 . c::>,... $... <0 '" '" $... $... 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IOc.nQJCO Q...... ... ... .<: . ..... .a ;::J . 0. Co .......... s..l-'">> s.. ~ s.. s.. ..... on .. C" c:: II ~ 0. < -_ C 10 "- . 3: 0. 0...... ... onc:: !: ... .~ <0 < Q.;::J - $... $... ...C:: ~O $... 0.. rf\ ... .~ 0 "'0"<:1 .<: on .~ . '" c::.~ .~ 0 ... .j. .. - ..... .e Ue a.~ c:: .~ $........ s...<: .~- ........ ... - . 0 ...'" "'~'" <0 .<:$... .<:u - C::'" "0 . "0 If\ z: $... S ..... ... "0 .~ U c:: ... t("' ... .. on 0. _C:: ....,.,... oq-- c.n <0 ... "'... _0 0 ..... ..... c:: $... ..."'''' '" '" ... .c:: ..... - ~ U '" 0 e.<: en ::3-_ ;::J..... Cl .......... 3:..... '" ..... ... II ;::J II ~ 0 ...C::UI .f"") 10 C!J n "'0 .~ ... '" - .~ II ..... s..q..c rei QJ "'0 ..c..c 0 -.... $...- .<: .c:: U ... \0 "0 U U u..N~::::Q <............... 0..0 Cl Co ......... .~ Vl 0.. < ..... .... ... - $... 0. ~ ~ ~ ~ ~ ~ 0. ~ ~ ~ ~ ~ Cl - N '" ... ll'l < 0 - N M ... .<: U s.. r.l :<: l- e>: <: :I: <.> 2: "" .... Vl ..... c :z: o .... I- -~ is ,. >- I- .... Vl :z: .... I- :z: .... 6-Hour Precipitation ll'l ll'l o - ~ i: ...... c:: .... ~ c:: 0 :~ .... ~ ... '" ...... ... . .... c:: ." s:>. .... .. .... X t.I ~ 'II .. f.< c:: 0.. 0 .... ... " f.< ",. :I: f.<. ::s '" Cl ...... . f.< :I: .lI> .... ,.... .'" c:: . ..... I ~ Cl '" 0.. >. ... .... ., c:: .. ... c:: .... J~.: ~ ~ .... !~ ~ ~ I- C' -,::ll.l I- j..- --... ...~~ n II II '" 0.. .... t.:. I.. . ~~~~~,: :> +- ~~ . .. " .. 'I" ',' '1:1 .,. . I . I, ",I r", , . ...ll..:.i.. ' I :1:,;, t I; , ': ,. " r:-r ! "! ',I i, IiI , I o - IV -A-14 . r-:-:, , .:1' ... ':jl !'.I ," 'it! ~ cot ..t ..: -a:~... r". "t "\ (.Jnoll/Sa4:lUO ^Hsua~UI '"l .. APPENDIX XI U" .... >< >< ......,. C-O ;2:' "'< 0..' ~~ \0 .., ... '" on ... ;::J o N ::c - <: 0 ~ 0 ..... .., '" $... ;::J 0 c ~ 0 '" 0 on N ... ..... ;::J In c:: - - ::E: . ? ~~/ ~o I~ -. (:j z << '" --.._. .~. ..M_ o "" - U'\ . "" "" ....r -r-l {) 0 0 c<' \ rC' - - o N w u > '" .. .. '" !:! ,,;:: 2~ .... ~.. w"< U !!~ ~ 7._ tIJ :-:... - g < "" <" ::::=0'; 10 0 -xu U 0 "'.. ... Cr.. = 0 . A 00- ac. ? :- ~ Q Z '- . ~ ~ ~;: U\ 'A.~QO ..:%" I D:: ~ t: I < Uk: I 0.. i... . w<o O:,.,J. .uG "10 . ,.J 7- :;)<~ "Cl 2.. .... < - "g .. .. .. < u w .. .. ~ - - - U'\ o "" - ~ - . ..... - - - U'\ - o "" V\ .::- 00 - - o "" II-A-? c.b " -< ~ . i u % z 0 < ... on I- OJ:: Cl..... 1 L&J% .....<( .I' I <=> V> I %l1..-' <:00 r ~ V> c:: l1..!z:1- l.I'\ 01.&.15 .",. 0 >-i=u <"'\ l.I'\ I-C::", %<0 :::>0...0 ow..... UOl1.. 7:::' o - I- c:::c I- - c.. - u . &.:..l t:::: c.. I I e:-' - 0' - -:;.. I ~'\o N c:: ~ 1J..I >- I <::) o - l(~ I r e:: =:J o - ...... I ~ N c:::: < t.l.I >- I . o o ,... t..~_ <:;) C-" --I c::.c S :::l --I ~ o v') - '\ = ....... \. . <"'\ <"'\, ......- o ~ o 0- ""r- rC"- . -.:> - L-. - ,0 ..... - ~-. .: . ,... "'-, l.I'\ .:r .. u s: " .. ~ " .. zi: 0< -.. ~" w ~~ u ~ 7- e:: ,,0 tU i ~ :a Q < ::: <:z:. d u >= u iu 100 tL. ~ 5 .D 0;:: 0 "" 1/t.... . ~ 05 ~~~~ .. - <;: I :I. j:: 00 0:: Z:4 < < U 0. ~ ~ t:J ;r.:" - o.~ 0 ~ . u::- V> 0 u :i .J ~ ~~ 0" -~ ~~ "g !;; ... < u .. .. ~ II-A-13 - o ..... '-"' .: k . TABLE II. hINTERPI{ETATIONS FOR LAND ~IANAGE~IENT --Continued . flap symbol RaA RaB RaC RaC2 RaD2 RcO RcE RdC ReI' RfF RhC RhE RkA RkB RkC Rm RoA RrC RsA RsC RsO RuG SbA SbC ScA ScB Sm" SnG \ SpE2 SpG2 SrO SsE 5tG SuA SuB SvE TeF Tf ToE2 i TOG TuB Ur VaA Soil Ramona sandy loam, 0 to 2 percent slopes-------__________ Ramona sandy loam, 2 to 5 percent slopes--------_________ Ramona sandy loam,S to 9 percent slopes-------__________ Ramona sandy loam. 5 to 9 percent slopes, eroded--------- Ramona sandy loam, 9 to IS percent slopes, eroded-------- Ramona gravelly sandy loam, 9 to 15 percent slopes------- Ramona gravelly sandy loam, IS to 30 percent slopes------ Redding gravelly loam, 2 to 9 percent slopes------------- edding cobbly loam, 9 to 30 percent slopes-----_________ Redding cobbly loam. dissected, IS to SO percent slopes. Redding-Urban land complex, 2 to 9 percent slopes: Redding-----------------------_______________________ Urban land--------------------_______________________ edding-Urban land complex, 9 to 30 percent slopes: Redding--------------------__________________________ Urban land---~-----------_________________~__________ eiff fine sandy loam, 0 to 2 percent slopes---------____ eiff fine sandy loam, 2 to 5 percent slopes----------___ eiff fine sandy loam, 5 to 9 percent slopes----------___ iverwash----------------------__________________________ ositas fine sand, 0 to 2 percent slopes---------________ ositas fine sand, hummocky,S to 9 percent slopes------- ositas loamy coarse sand, 0 to 2 percent slopes--------- ositas loamy coarse sand, 2 to 9 percent slopes-------__ ositas loamy coarse sand, 9 to 15 percent slopes-----,--- Rough broken land----------------------__________________ alinas clay loam, 0 to 2 percent slopes--------------___ alinas clay loam, 2 to 9 percent slopes------------_____ alinas clay, 0 to 2 percent slopes--------______________ alinas clay, 2 to 5 percent slopes--------------________ Mi.uel rocky silt loam 9 to 30 percent slopes------- an Mlgue,-cxc"equer rocky silt loams, 9 to 70 percent slopes: San Miguel------------------------___________________ Exchequer----------------------______________________ heepneaa rOCKY fine sandy loam, 9 to 30 percent; slopes, eroded. heephead rocky fine sandy loam, 30 to 65 percent slopes, eroded. loping gullied land-------------------__________________ oboba stony loamy sand, 9 to 30 percent slopes---------- teep gullied land---------------------__________________ tockpen gravelly clay loam, 0 to 2 percent slopes------- tockpen gravelly clay loam, 2 to 5 percent slopes------- tony land-------------------------______________________ errace escarpments---------------_______________________ idal flats----------------------------__________________ Tollhouse rocky coarse sandy loam, 5 to 30 percent slopes. eroded. ollhouse rocky coarse sandy loam, 30 to 6S percent slopes. ujunga sand, 0 to S percent slopes--------______________ Urban land-------------------------______________________ Visalia sandy loam, 0 to 2 percent slopes--------------__ See footnotes at end of table. Hydro- logic group Erodibility C C C C C C C o D o Severe 16---- Severe 16---- Severe 16---- Severe 16-- -- Severe 16---- Severe 16---- Severe 16---- Severe 9----- Severe 9----- Severe 1----- Limitations for conversion from brush to grass SI ight. Slight. Slight. Slight. Slight. SI ight. Slight. Moderate. ~loderate . Moderate. Slight. Slight. Slight. Seve re. Severe. Slight. 1/ Slight. 1/ Slight. II Slight. 1/ Moderate -: D Severe 1----- Severe. 0 Severe I___n Severe. L ---- e. ~ C Severe 1----- Moderate. y B Seve re 2_nn Severe. 4/ A Severe 2_nn ~foderate -: 0 Severe 1----- Seve re . 0 Moderate 2--- SI ight. 0 Moderate 2--- Slight. A Severe I_n__ Severe. D Severe 1----- Severe. 0 Severe 2, 4 C Severe 9_uu Severe. C Severe 1----- Severe. A Severe 2-_n_ Slight. 0 B Sc,!~re 16nn SI ight. D o o D B B B A A A A A A o C C C C o Severe 16---- Severe 16---- Severe 16---- Severe 2, 4-- Severe 2 Severe 2 Severe 2 Severe 2 Severe 2 Severe 1----- Moderate 2--- Moderate 2--- Slight-nun Slight-----n Severe 9----- 37 . SECTION 3 SITE DRAINAGEINODE MAP . NoText NoText