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lateral berms and are described in Section 2.5.3 - Protection <br />of Lateral Berms. <br />2.5.3 Protection of Lateral Berms <br />Lateral berms are to be protected in a manner similar to the <br />requirements for the pitside slopes of riverbank berms, in <br />general, the crest of lateral berms are to be revegetated and <br />the downstream face of lateral berms are to be stabilized and <br />protected using the methods proposed in Section 2.4 - Pitside <br />Bank Protection. <br />Riprap, riprap with vegetation, soil cement, and a reinforced <br />core are all viable options for reinforcing both Type A and <br />Type B lateral berms. These methodologies are to comply with <br />the requirements of Section 2.4.1 - Riprap, 2.4.2 - Riprap with <br />Vegetation, 2.4.3 - Soil Cement, and 2.4.4 - Reinforced Core, <br />respectively. The general geometric characteristics of lateral <br />berm protection will conform to the individual details for the <br />selected method of protection except that the protection need <br />extend only 3 feet below the pit normal water level. <br />2.5.4. Spillway for Type A Lateral Berms <br />A spillway will only be allowed for Type A lateral berm protec- <br />tion. The existing or future arterial road crossing associated <br />with Type B lateral berms renders the spillway approach infea- <br />sible. The required length of the spillway for Type A lateral <br />berms along the South Platte River will be determined using the <br />following equation: <br />La 1 = 2 , 500/Hl . s <br />UD6FCD GP.AVEL QIIDELIN-cS 12/17/87 <br /> <br />2-27 <br />