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<br />FLOODWAY DETERMINATION USING COMPUTER PROGRAM HEC,2 <br />by Vernon R. Bonner <br /> <br />liHRODUCTION <br />The purpose of this document is to illustrate how computer program <br />HEC-2 can be used to develop a designated floodway as required for <br />Type 1:) Flood Insurance Studies. I t is assumed the reader has a knowl- <br />edge of the basic input requirements described in the Users Manual <br />(reference 5) for the computer program. <br />An approach follovled by the Corps of Engineers for flood plain <br />management is presented in a paper entitled "The Regulatory Floodway" <br />(reference 1). A procedure for delineating a floodway is given in a <br />pape titled "General Guidel ines for Development of Floodway Data" <br />(reference 2). This training document includes information presented <br />in those references and presents the computer application of the ap- <br />proach for floodway delineation outlined in reference 2. <br /> <br />. DEFINITIONS* <br />a. Natural FloodwaJ[ is the channel of a watercourse and those <br />portions of the adjoining flood plain which are reasonable required <br />to carry and discharge the floodwaters of a selected probability-of- <br />occurrence flood. <br /> <br />*Excerpts from reference 2. <br /> <br />1 <br />