Laserfiche WebLink
There is rock in and around the reservoir basin which is expected <br />to usable for rip rap. The rock is very hard but may not be the <br />best sizes for rip rap which may require a thicker layer than the <br />estimated 2 feet. <br />There is also an auxiliary dam which wilt be evaluated during the <br />plans and specification phase. The cost of any repairs are minor <br />compared to the main embankment but should be addressed in detailed <br />studies. <br />OUTLET PIPE: The outlet pipe size is suggested to be 24 inch <br />diameter which is significantly larger than the size required by <br />the Rules and Regulations but provides easier operation and <br />maintenance and if a liner is needed in 50 years or so, it can be <br />installed without impacting the ability to drain the top 5 feet of <br />the reservoir in 5 days. The pipe material should be thick walled <br />steel, possibly lined or encased with mortar or concrete; CMP is <br />not recommended. During the design process, the necessity for a <br />concrete bed for the pipe or encasing the pipe in concrete should <br />be investigated. <br />SPILLWAY: The spillway will be sized to pass one half the PMP. <br />The existing spillway width is expected to be adequate but can be <br />easily widened if necessary. The spillway channel is presently in <br />rock and no additional rip rap is expected to be required. <br />Big Battlement Dam 9 <br />