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Jun 09 98 10: 14a Dr.^gChesnem I6658$ P. 7 <br /> Table 4. Runoff volume from unpaved lots during a 25-year, 24-hour storm event and the <br /> average December- March winter precipitation for different locations in California. <br /> Location 25-yr 24-hr 25-yr 24-hr 120 day 120 day Total runoff <br /> Storm Storm :Dec-Mar Dec-Mar volume from <br /> Rainfall' Runoffs Rainfai13 Runoff' lots" <br /> (inches) (inches) (inches) (inches) {cubic ft/acre <br /> Chico 41 3.11 17.49 3.40 23,573 <br /> Eureka 5.1 3-97 23.98 7.83 42,728 <br /> Fort Bragg 5.0 3.88 25.74 7.10 39,759 <br /> Fresno 2.3 1.35 6.89 0.92 8,220 <br /> Lodi 3.1 2 08 10.82 1.89 14.737 <br /> Los Banos 2.3 1.35 5.73 0.82 7,858 <br /> Madera 2.4 1-44 <br /> 6.86 0.98 8,783 <br /> Modesto 2.4 1.44 7.7 1.18 9,487 <br /> Napa 4.4 3.30 17.05 3.65 25,166 <br /> Orland 3.7 2.64 13.06 2. 54 18,757 <br /> Petaluma 4.9 <br /> 3.78 17..39 3.90 27,$09 <br /> Rivortide 4.0 2.92 6.7S 0.63 12,855 <br /> i <br /> Sacramento 3.3 2.26 11.70 2.27 16,403 <br /> Santa Rosa 5.0 3.88 . 20.89 4.89 31,75$ <br /> Stockton 2.7 1.71 9.96 1.73 12.456 <br /> Turlock 2.4 1.44 7.84 1.17 9,451 <br /> Visalia 1 2.4 1.44 6.40 4.79 6,075 <br /> 'National Oceanic and Atmospheric Administration Precipitation -Frequency Atlas of the <br /> western United States (NOAH Atlas 2, 1973), pages 43 and 67. <br /> INRCS runoff curve number (CN) value of 90 was used to calculate runoff <br /> - <br /> 3Sum of December -March NRCS mean monthly, precipitation figures, 1941-1970_ <br /> 4 Sum of December - March precipitation figures'muftiplied by the estimated runoff from ' <br /> unsurfaced feedlots (CN = 90) as a percent of mean monthly precipitation (NRCS <br /> Agricultural waste Management Handbook (6), pages 10C-7,-8,-9 and -18). <br /> 6Sum of 25-yr, 24-hr stormand 120 day runoff(inches) multiplied by 3,621 - cu feetlacre, <br /> Serietber Date; P• S 2 101RQ7: 12 l <br /> { <br />