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� <br />C� <br />selected in drainage is not feasible in terms of implementation, he will bring this to the <br />attention of COIJNTY and LOCAL SPONSORS and another alternate will be <br />considered for preliminary design. <br />This Preliminary Design sha11 be adequate in detail to properly plan bridges and <br />culverts for ne�v vehicular thoroughfare construction, to permit the acquisition of <br />needed channel right-of-way and to pernut the planning of new subdivisions and <br />buildings with full knowledge of future channel and floodplain locations and <br />characteristics. The drawings shall show the plan and profile of the 100-year <br />floodplain under e�cisting channel conditions for fully-developed watershed flows, in <br />enough detail to permit zoning. The work is specifically defined as follows: <br />2.B.1. Delineation of the draina.ge watersheds and appropriate sub-watersheds. <br />2.B2. Detailed hydrologic and hydra.ulic studies shall be prepared to update as <br />needed, the drainage information conceming the magnitude of flood runoff and <br />volume of flow to be subsequently used for the preliminary design of facilities <br />under the selected plan for the �-, 10-,25- and 100-year design storm. In <br />perfornung hydrology studies, Engineer should assume that any irrigation canals <br />will not intercept stormwater run-off unless there is submitted written <br />documentation of historic acceptance, court ruling or other similar information. <br />This information will be presented in hydrograph form. <br />2.B.3. Any surveying deemed necessary by ENGINEER shall be recommended <br />to COUNTY. Survey information, as needed, will be provided by COUNTY <br />and District. <br />2.B.4. Prepare a detailed cost estimate for each reach of the selected alternate. <br />The estirnated costs should be divided into Draina.geway improvement costs <br />(drainage costs), traffic costs (street crossing costs), utility relocation costs, <br />property acquisition costs, and the present worth of operation and/or <br />maintenance costs. The cost estunate will identify costs b}� station, and type of <br />structure or facility (i.e. channel, detention, tnckle channel, culvert, bridge, drop <br />structure, pipe, manholes, riprap protection, utility relocation, etc.) so it is clear <br />what components were included in the cost estimate. Include repr.esentaxive <br />present day unit costs, and indicate the percentage utilized for contingencies, <br />engineering, lega] and administraxive. <br />2.B.�. Prepare preliminary design of drainage facilities. <br />2.B.6. Prepare master plan drawings in ink on 22" x 34" plan and profile mylar <br />