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<br />.. <br /> <br />( <br /> <br />", <br /> <br />~' <br /> <br />,. <br /> <br />c, <br /> <br />l <br /> <br />Jt, <br /> <br />- 36 - <br /> <br />. <br /> <br />Excavated materials fram the emergency spillway should be less <br />than 15 percent. of the total material requirement of the darn. Design <br />criteria for emergency spillway capacities are in the Hydrology <br />$ec.tion of this :work plan. .. <br /> <br />The nl-l floodwater-retarding structure is classified as class <br />Ilcfl based on the interpretation of Engineering l:ernorandum SCS-27, <br />revised. Capacity for sediment storage is provided to contain the <br />estimated sediment accumulation at the site for the next 50 years. <br />The floodwater-retarding capacity is-based on the runoff of three <br />inches occurring on the watershed less frequently than once in 100 <br />years. There will be no dead storage in this structure. A typical <br />structure is shown in Figure 3. Structure data for IW-l is listed <br />in Table 3. <br /> <br />. <br /> <br />. <br />