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This report summarizes a two-part flood plain drainage study for the City of Sterling, Colorado. objectives of this study are to: a. evaluate the e~istlng Pioneer Ditch and related drainage ditches and recommend feasible improvements. b. eliminate importation of storm waters into the Sand Creek Basin and assure the safe exportation of storm water odginating'in Information and Tile principal A conceptual master drainage plan is proposed for tile entire city whiCh would significantly improve local storm runoff management, and also reduce damages from regional flooding. The report includes a technical addendum containing supporting hydrologic and engineering data wllich may further be used in: (1) ~king submittals required by the National Flood Insurance Program, and (2) detailed site spe<:1fic engineering studies of proposed improvements. I. INTRODUCTION the basin. c. providetecllnicallyaccurateandm.lnageablefloodplaininformation based on detalled mappfng for revising the existing floodplain information and flood insurance study. d. document and report findings of existing flood potential in sufficient detail for planning, zoning and re<;Julat10n purposes with an easy transition to development of a fina1 master drainage plan. Authorization This report was authorized by the Colorado Water Conservation Board injointsponsorshipwiththeCityofSterlil19,Colorado. TheBoard's power and duty is... "... to devise and formu1atemethods, means, and plans forbringi n9 about the greater ut1l1zation of the waters of the state and the prevention of flood damages therefrom and to designate and approve storm or flood water runoff channels or basins, and to make such designations available to legishtivebodies or oities and incorp- orated towns, to county planning commissions, and to boards of adjustment of cities, incorporated towns, and counties of this state..." Purpose and Scope This report is intended to guide the City of Ster1ing i.nplanning future land use of flood-prone areas ln theSandCreektlasin. ltshould also help the City to set priorities in mitigating flood and drainage problems. rtincludes Information on the severity and extent of probable future floods. This report also contail1S maps delineatin9 f100ded areas for the 5- and lOO~year events, and flOOd water elevation profiles for the 5-. 10-, 2S-, 50-, 100_, ~~~ 5C'a-ycJ.l" t..'t~t~. Thestudyevaluatesstructuralandnonstructurallmprovementplans to either eliminate much of the damage from future floods or regulate developr.lentinf1oodhazardareas. Several options are available to the City for regional flooccontrolanddrainageirnprove'l1ent. Tlleseoptions are pres~nted to guide future development below the Pioneer Drainage ~itch. as stated in Section 37-60-106(0) of the Colorado Revised Statu teslg73. The cities. incorporated towns, and counties within the study area ~~y provide zoning regulations... "...toestablish,regulate,restrict,andlimitsuchusesonor along any storm or f100dwater runoff channel or basin, as such storm orfloodwaterrunoffcllannelorbasinhasbeendesignatedandapprov- ed by the Colorado Water Conservation Board, in order to lessen or avoid the hazards to persons and damage to property resulting from the accumulation of storrn or flood waters..." as stated in Section 30-28-111 for county governments and Section 31-23- 201 for municipal governments of tile Colorado Revised Statutes 1973. Upon official approval of L~is report by tile Colorado Water Conserv- atjo~ Soard, t~c J.rta~ described J~ bti~g i~~~datcd by the lOO-year flood (intermediate regional flood) can be designated as flood hazard areas and their use regulated accordingly by the local agencies. The terms "intermediate regional flood", "lOO-year flood",and "one percentf1oad" can be used Interchangeably since they refer to th esa"", flood. Kowever, to avoid confusion, the term "lOa-year flood" is used exclusively throughOlJt this report. 1 2