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Forward ROS! <br /> Runoff Calculations <br /> and Areas <br /> tree A--Waste receiving,grinding and sto 1e 9.09 acres <br /> Area B-Compost screening,curing and product store a 7.67 acres <br /> Area C--Active composting area 14.92 acres <br /> Area D--Stormwater retention pond 1.55 acres <br /> Total 33.23 acres <br /> Assume retention pond is designed to hold the average annual runoff from the entire site. <br /> �- Assume the runoff for wetter years will be hauled to the Stockton munici al wastewater treatment plant until <br /> the water quality can be measured to determine if discharge to the South Fork of Little'ohift Creek is permissible. <br /> Assume the water in the retention pontl will be evaporated or used in the compost process in dry weather to obtain <br /> desired initial moisture content of mtxtsare sent to composting. <br /> L; Assume a runoff coefficient of 1.0 for C. culating the size of the retention basin. <br /> Water Balance <br /> t <br /> Average Average Average Average mum Minimum Minimum Maximum <br /> r Precipitation Evaporation Evaporation Net Precipitation Evaporation Evaporation Net <br /> (inches) millimeters) inches) (inches} (inches) (millimeters (inches) (inches) <br /> _ Janua 2.75 18 0.71 2.04 6.2 14 0.55 5.65 <br /> Februn 2.76 35 1.38 1.38 5.28 34 1.34 3.94 <br /> arch 2.28 97 3.82 -1.54 3.51 70 2.76 0.75 <br /> pill 1.03 1S3 6.02 -4.99 0.65 154 6.06 -5.41 <br /> '.2y- 0.53 227 8.94 .41 0.11 232 9.13 -9.02 <br /> ..une 0.07 29) 11.42 -11.35 0 254 10.00 -10.00 <br /> Jul 0.01 287 11.30 -11.29 0 274 10.79 -10.79 <br /> Au ust 0 2S) 9.84 -9.84 0 257 10.12 -10.12 <br /> September' 0.11 18.1 7.13 -7.02 0.03 203 7.99 -7.96 <br /> October 0.71 105 4.13 -3.42 0.56 87 3.43 -2.87 <br /> November 1.38 •49 1.93 -0.55 0.28 42 1.65 -1.37 <br /> December 2.99 19 0.75 2.24 5.6 17 0.67 4.93 <br /> Total 14.62 1,71.1 67.36 -52.74 22.22 1,638 64.49 -42.27 <br /> Notes: <br /> 1. Monthly precipitation data from Stockton Fire Station No.4 for the period 1931 through 1952. <br /> 2. Monthly evaporation data from St kion station 890 856200 for the p2riod 1955 through 1963. <br /> S. Net column is calculated as precipitation minus evaporation. A negative value indicates net evaporatio,n. <br /> 4. Maximum re ' nation is for 1940. This is apRroximately approximatelya one In 25 year event. <br /> 5. Minimum evaporation is for 1958. <br /> 6. Maximum net is calculated as maximum precipitation minus minimum evaporation. <br /> I <br /> L- <br /> FN:dtr/aA ATERBAL.XLS Page 1 of 5 Printed:8/31/94 3:46 PM <br />