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Forward RCSI <br /> Runoff Calculations <br /> Land Areas <br /> ,rea A--Waste receiving, grinding and stockpile 9.09 acres <br /> Area B--Compost screening,curing and product storage 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 municipal wastewater treatment plant until <br /> the water quality can be measured to determine if discharge to the South Fork of Littlejohn's Creek is permissible. <br /> Assume the water in the retention pond will be evaporated or used in the compost process in dry weather to obtain <br /> desired initial moisture content of mixture sent to composting. <br /> Assume a runoff coefficient of 1.0 for calculating the size of the retention basin. <br /> 1 Water Balance <br /> Average Average Average Average Maximum Minimum Minimum Maximum <br /> Precipitation Evaporation Evaporation Net Precipitation Evaporation Evaporation Net <br /> (inches) (millimeters) (inches) (inches) (inches) (millimeters) (inches) (inches) <br /> January 2.75 18 0.71 2.04 6.2 14 0.55 5.65 <br /> February 2.76 35 1.38 1.38 5.28 34 1.34 3.94 <br /> March 2.28 97 3.82 -1.54 3.51 70 2.76 0.75 <br /> April 1.03 153 6.02 -4.99 0.65 154 6.06 -5.41 <br /> ay 0.53 227 8.94 -8.41 0.11 232 9.13 -9.02 <br /> 'u,ne 0.07 290 11.42 -11.35 0 254 10.00 -10.00 <br /> July 0.01 287 11.30 -11.29 0 274 10.79 -10.79 <br /> August 0 250 9.84 -9.84 0 257 10.12 -10.12 <br /> September 0.11 181 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 1,711 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 Stockton station 890 856200 for the period 1955 through 1963. <br /> 3. Net column is calculated as precipitation minus evaporation. A negative value indicates net evaporation. <br /> 4. Maximum precipitation is for 1940. This is approximately a 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 /> FN: dtr/a.\W <br /> ATERBAL.XLS Page 1 of 5 Printed: 8/31/94 3:46 PM <br />