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<br />impounded in addition to that of the 185 acres mentioned in <br />Appendix C., the applicant is actually depleting the surface flow <br />by almost 6%, rather than the 2.7% mentioned. The following <br />stipulation is proposed. <br />The applicant shou <br />`' / ume of water to be <br />~ ary impoundment. <br />route the entire <br />through ditch E to <br />Id obtain a water right to the vol- <br />permanently detained in the tempor- <br />Alternatively, the applicant can <br />drainage from this impoundment <br />North Fork. <br />All the emergency spillways are designed to carry the 25 year, 24 <br />hour peak flow. The peak flow was determined using "Procedures <br />for Determining Peak Flows in Colorado". The equation used to <br />size the spillways, <br />Q = CLH 1,5 <br />with C equal to 3.0 and L equal to the bottom width of the em- <br />bankment, is acceptable. ' <br />A potential problem with supercritical velocity, based on <br />calculations of velocity and Froude number, exists at several <br />primary and emergency outlets. Based on the USDI, Bureau of Rec- <br />lamation document, "Design of Small Canal Structures" as a mini- <br />mum requirement all of the spillways for the ponds and the <br />impoundment must be provided with erosion protection therefore <br />the following stipulation is proposed. <br />All spillways must be provided erosion protection. <br />Based on °Design of Small Canal Structures", 12" <br />s~ / riprap 1/2" min) on 6° of sand and gravel should be <br />`~~ used. The applicant must use an accepted engineering <br />methodology to design and size erosion protection, and <br />all supporting detail and calculations must be sub- <br />mitted to the regulatory authority. <br />-73- <br />