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in t.he entire basin and flood plain zoning for lhe IOO-year flood. The Pha~:e A report was formally accepted by th~~ Dif:-tric:t on December 21, 197 I,. A draft report on the Phase 13 ba:::;ed tiLl rec:onunendations contained in Pha~,e A was submitted to IJrban Drainag~ arlr! Plocld Control District on Mare'h 30, 1975. FoJlowing discussi.ons, LhE~ Jrban Drainage and Flood Control District notified Eel on December to, 1.976, i_ts desire to ch.ange the scope of improvements as suggest(~d 1n Phase A report. Essentially, iL involves the elimination of a dam at: Lh(, ;\oc:ky Mountain Arsenal, eli- mina tion of most of the recommended i.mprovements east_ of Buckley Road and provision of a 100-year flood challnel (:Iown~tream of O'Brian Canal ",..'itl- improvements to the ~,tructure:s in thi~~. reach. Phase B, which is the subject of this report, consists of the pre- liminary design for the selected plan in P~.ase A with the revisions con- tained in the above referred letter. Notic'e to proceed wi,th the revised Phase B was given in a letter from the Urb"n Drainage and Flood Control District dated December 21, 1976. 9~;!!J~-' _.5~~_ _~_~~~J~ The scope of the Phase B work is givell ,n paragraph 3B of t.he con- tract. The objective is to provide prelimjnary designs for the approved and revised Plan A in adequate detail to ))(Jrmit the District, Aurora, Ci ty of Denver, Adams County and Arapahoe> Count)' to properly plan their highways and drainage facilities, rj,ghts-of-~'ay, construction activities and guide developers. Briefly, the scope of work inc]u(ies: 1. Hydrology and llydrau11C:5 Del" ti2."1. 2. Preliminary Design. 3. Preliminary Cost Estimatp5. These aspects of the work arc pr('sPJll~d i~ the two volumes of this report. I,,-2