Laserfiche WebLink
<br />2.4.4 Reinforced Core <br />A reinforced core may be used to stabilize the pitside slope of <br />riverside berms against erosion from overtopping. The ge o-- <br />metric configuration of the reinforced core should conform to <br />the requirements indicated on Figure 2.7. The reinforced core <br />will be made out of large riprap (Type VF3 or larger as defined <br />in the USDCM or large rubble) with a 5 foot thick layer of <br />material on the pitside face grouted. Soil cement or some <br />other material appcoved by the District may be used as a core <br />reinforcement in lieu of riprap. The core will be placed <br />within the berm no mare than 25 feet from the top of the pit- <br />side slope. <br />2.4.5 Side Channel Spillway <br />Side channel spillways may be provided between the river and <br />the pit in order to minimize the potential for failure of the <br />riverside berms. The stabilized spillway allows water to pass <br />between the river and the pit. A spillway on the upstream end <br />of the pit and one at the downstream end of the pit will be <br />required unless the pit is small, in which case one spillway <br />will be sufficient. Side channel spillways prevent the build- <br />up of large differential heads between the river and water in <br />the pit. <br />Because of the nature of 'the hydraulic response of the spill- <br />ways, the differential head cannot be completely eliminated. <br />The objective is to minimize, to the extent possible, the <br />differential head between water in the river and water in the <br />pit when the riverside berms overtop. <br />UDfiFCD GRAVEL GUIDELINES 12/17/87 <br />2-18 <br />