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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />i I <br /> <br />4.0 REPORT GUIDELINES <br /> <br />4.1 Drainage and Erosion Control Reports and Plans <br /> <br />The four step drainage planning/design process as defined in Chapter one <br />defines the framework for which submittal requirements are generated. <br />Discussions of Drainage Basin Planning Studies (DBPS) is limited in the manual <br />with regard to submittal requirements and technical criteria. Each DBPS is <br />unique and the engineer will work with the City/County in preparing the format <br />and technical approach. A general outline is shown in Figure 4-lmay be used as <br />a guideline to development of a DBPS. A developer may be reqUTred to complete <br />a DBPS if a current study is not on file at the City/County. <br /> <br />The remaining steps in the drainage planning/design process includes the Master <br />Development Drainage Plan and the Preliminary and Final Drainage Reports. <br /> <br />A detailed Master Development Drainage Plan shall be submitted (7 copies) by <br />developers that relates to both local and regional land development plans. A <br />preliminary drainage report shall be submitted (7 copies) at the time of <br />preliminary plat submittal. Subsequent to approval of the preliminary drainage <br />report, a final drainage report shall be submitted (7 copies) with the final <br />plat. The flow chart in Figure 4-2 depicts the City/County Drainage review <br />process. When specific improvements are required, the construction drawings <br />and specifications must be submitted for review with the final plat. All <br />reports shall be typed on 8-1/2" x 11" paper and properly bound. The drawings, <br />figures, plates and tables shall be bound with the report or included in a <br />folder/pocket attached to the report. All reports shall include a cover letter <br />and shall be prepared by a registered professional engineer licensed in <br />Colorado. The report shall be properly certified and signed by such engineer. <br /> <br />All drainage reports shall be prepared by a professional engineer, registered <br />in the State of Colorado, and shall be reviewed for compliance with the minimum <br />requirements and specifications set forth herein. The Engineer should allow at <br />least 30 days for review and approval. However, reports involving large <br />developments and/or complex issues will require more review time. The Engineer <br />should be aware that whenever unusual or serious drainage problems are <br />anticipated in oonjunction with a proposed development, additional information <br />and analysis beyond the minimum requirements of these specifications and <br />criteria will be required. <br /> <br />Any proposed development which alters on existing FEMA National Flood Insurance <br />Program (NFIP) map must identify this change in a PDR and shall submit a Letter <br />of Map Rev is i on (LOMR) or Letter of Map Amendment (LOMA) to FEMA. New NF I P <br />maps for the City and County have recently been approved by FEMA and should be <br />available in 1987. The September, 1985 FEMA publication entitled "Appeals, <br />Revisions, and Amendments to Flood Insurance Maps, A Guide for Corrmunity <br />Officers" should be consulted to determine requirements for changing NFIP maps. <br />The City/County will not approve a PDR unless a LOMR or LOMA has been submitted <br />to FEMA. <br /> <br />4-1 <br />