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1-5 <br /> <br />Forward Resource Recovery Facility SWT Engineering <br /> Transfer/Processing Report - July 2014 <br />z:\projects\allied waste\forward\resource recovery facility\5 yr permit rvw 2013-14\tpr 2014\text\sec1.doc <br /> <br />the 100-year flood-flow of 1,025 cubic feet/second (cfs) within its banks with an additional <br />one foot of freeboard. In the event that a 500-year flood occurs (1,100 cfs, according to <br />FEMA Flood Flows), the excess flow will spill over the northern bank and into the adjacent <br />farm land, rather than affecting Forward Landfill. Based on the realignment of the North <br />Fork of South Littlejohn’s Creek, the landfill property is not located within the predicted <br />elevation of the 500-year flood zone. Therefore, the existing realignment does not require <br />an assessment for potential erosion or saturation of the landfill. <br />The South Fork of South Littlejohn’s Creek runs south of and adjacent to the southern <br />perimeter of the refuse footprint of the landfill. From the FIRM map (Map No. 06077C <br />Panels 0635F and 0630F), the existing South Fork of South Littlejohn’s Creek is labeled as <br />“Zone AO, (Depth 1)”, indicating depths of one foot, and Zone AE, indicating base flood <br />elevations within the creek. These current flows are very slow and non-erosive and as a <br />result, will not inundate or potentially erode the adjacent creek or inundate the landfill. The <br />predicted elevations from the 500-year flood event range from 40.5 feet on the southwest <br />edge to 43 feet on the east edge of the landfill along Austin Road and this level is only one <br />to two feet higher than the toe of existing landfill slopes. The existing South Fork of South <br />Littlejohn’s Creek was designed to channel the 100-year flood flow of 1,550 cfs within its <br />banks and an additional one foot of freeboard. In the event that a 500-year flood occurs <br />(1,700 cfs, according to FEMA Flood Flows), the excess flow will spill over the southerly bank <br />and into the adjacent area, rather than impact the Forward Landfill. The South Fork of <br />South Littlejohn’s Creek alignment is also a very flat gradient, 0.0006 feet per foot; <br />therefore, erosion is not a significant concern. <br />1.7.4 Evaporation <br />The estimated annual evaporation for the site is 78.43 inches based on Pan A evaporation <br />data recorded between 1919 and 1968 at Oakdale Woodward Dam (Station No. B00 <br />630500, latitude 3751'28", longitude 12052'42", elevation 215 feet above mean sea level <br />[amsl]), located approximately 13 miles southeast of the site (California Department of Water <br />Resources, 1979). A minimum mean monthly evaporation of 1.14 inches has been calculated <br />for December and January, and a maximum mean monthly evaporation of 14.69 inches has <br />been calculated for July. <br />1.7.5 Wind <br />During summer periods, winds usually originate from the north end of the San Joaquin Valley <br />and flow in a south-southeasterly direction through the valley and Tehachapi pass, and then <br />into the neighboring Southeastern Desert Air Basin. During winter months, winds <br />occasionally originate from the south end of the valley and flow in a north-northwesterly <br />direction. During winter months, the valley experiences light, variable winds, less than 10