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<br />EXPECTED ANNUAL FLOOD DAMAGE COMPUTATION <br />THE HYDROLOGIC ENGINEERING CENTER <br />COMPUTER PROGRAM 761-X6-L7580 <br /> <br />INTRODUCTION <br /> <br />1. ORIGIN OF PROGRAM <br /> <br />This program was written in The Hydrologic Engineering Center (HEC) <br />by Harold E. Kubik with guidance from Darryl W. Davis and William K. <br />Johnson. It replaces an earlier program entitled Average Annual Damage <br />Program (723-G2-L2510). The development of this program was sponsored <br />by the Corps' Institute for Water Resources. <br /> <br />2. PROGRAM CAPABILITIES <br /> <br />This program was developed to assist in economic evaluation of flood <br />plain management plans. Particular attention was given to the require- <br />ments and guidelines in ER 1105-2-351, "Evaluation of Beneficial <br />Contributions to National Economic Development for Flood Plain Manage- <br />ment Plans. "lI Of the three types of benefits discussed in this <br />regu1ation--inundation reduction, intensification and 10cation--on1y <br />inundation reduction is handled in this program. <br /> <br />Damage may be computed in three different modes: (1) the damage <br />associated with a specific flood event, for example, the estimated damage <br />should the Standard Project Flood occur, (2) the expected annual damage <br />associated with a specific year or several selected years, for example, <br />expected annual flood damage for year 1980, 1990, and 2000 hydrologic, <br />hydraulic, and economic conditions, and (3) the equivalent annual flood <br />damage associated with a particular discount rate and period of analysis, <br />for example, equivalent annual damage discounted and amortized at 7 percent <br />for a period of analysis of 50 years. The computation of damage for <br />specific flood events or of expected annual flood damage is made for each <br />flood plain management plan based on the hydrologic, hydraulic and economic <br />data for a damage reach. Several damage categories--urban, agricultural, <br />industrial, residential, etc.--may be analyzed at the'same time and are <br />totaled for each plan and reach. Expected annual damage may also be <br />computed for conditions existing during some previous year (historic <br />conditions). Equivalent annual flood damage will be computed when the <br />discount rate and period of analysis are specified. <br /> <br />lIDepartment of Army, Office of the Chief of Engineers, Washington, D. C., <br />13 June 1975. <br /> <br />I~ <br />