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• <br /> <br />SITE CULVERTS <br />The site culverts were designed based on the flow into the culverts from the site ditches as shown <br />on the following table. The culverts were sized based on the Handbook of Steel Drainage R <br />Highway Construction Products, April 1983, figure 4-28. The following maximum peak Flows <br />values were used to deterrninc the size the culverts. <br />12" Diameter 2.05 cfs <br />18" Diameter 5.75 cfs <br />18" Diameter* 6.25 cfs <br />24" Diameter 12.0 cfs <br />30" Diameter 20.0 cfs <br />36" Diameter 32.5 cfs <br />* With end section conforming to fill slope. <br />• TR-Ot EXH-8 - 30 - <br />-rfz-b i <br />~ie7 <br />