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x-6 37. Energy dlsslpators are required below the Calkins Ditch headgate. (Sheet 15), 38. In addition to the two existing 9-foot diameter culverts, two new 10' x 17' box culverts are to be constructed at a substantially higher el<!vation than the existing culverts under Sheridan Boulevard. Special attentIon Is to be given to thO! construction of head walls and entrances for both the existing and the new culverts. (Sheet In. 39. FIve hundred feet of concrete median bal-rler(ln U. S. 36 (Denver- Boulder Turnpike) should be removed and replaced with .3 post and rail type steel barrier to allow for passage of storm water over the Turnpike. (Sheet 19). 49. A benefit cost type analysis was performed during Phase A to deter- mine the Illternative and design frequency to be studied In detali for Phase B. The al ternat Ive chos,en h'IS the lellst annuai cost of all alternatives and frequencies studied. 41. Channel work, bank protection, road embankment materials and bridges that are necessary to meet road overtopping criteria have been In- cluded In the highway fund respons Ibi I ity. ThIs Is especially suit- able for this study since nearly all bridges and roads do not meet the vehicular criteria of their future intended use. 42. In keepln~, with present policies in both Adams County and WestmInster, no cost has been Included for land acquisition. Both entitles re- quire developers to preserve the flood plain and/or turn over the rights of the flood plain property to the re~lpectIve agencies. 43. During large storms It Is expected that: the high velocIties durIng the peak runoff and the sed I mentat Ion t.hat will occur <IS the runoff rate decreases w III comb I ne to cause cons I der,ab 1 e channe I a i terat. Ion. The cost shown for 0 & M and for flood damagE'S applies equally to reestablishing the old channel If des Ir'able or to construct Ion of new low flow erosIon protective devIces for (:nannO!l stabilization. 44. The Implementation of the preliminary des ign should include the following major steps: a. Designation of the Big Dry Creek Flood PlaIn by the Colorado Water Conservat Ion Board In aCGord,~nce wi th State Statutes and procedures which are wel I defIned and und<!rstood. b. Adoption by the local governmental entltlO!s Involved of the Flood Plain Regulation of the Urban [lralnage and Flood Control District. c. Local overlay zoning of the flood plain h~1 thE' City of Westminster and the Counties of Jefferson ''II1d !\dams. This wll I not change basic zonIng of the land.