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<br />EXHIBIT 1 <br />EFFECTS OF FLOOD PLAIN MANAGEMENT MEASURES <br />ON STAGE, DAMAGE, FLOW, AND FREQUENCY FUNCTIONS <br />INTROOUCTIOr! <br /> <br />Flood plain management measures protect damaqeable prooerty, both <br />existing and future, in one of two ways. Either they manaQe water (re- <br />duce the magnitude or frequency of flooding) or thev manaCle the suscep~ <br />tibility of property to damaqe. the tabulation below includes several <br />typical measures of each type that will be discussed and illustrated in <br />this section. <br /> <br />Flood Plain Management Measures <br /> <br />Hater:. ManaQeMent <br />Reservoirs <br />Levee or Floodwall <br />Channel Modification <br />Diversion <br />Flood Forecasting <br /> <br />Oamaqe Susceptibilitv ~anaClement <br />Flood Proofi no <br />Relocation <br />Flood ~!arninq <br />Land Use Control <br /> <br />Measures desicmed to manaqe ~Iater, either locally or throuohout a <br />system, can alter various hydroloqic, hydraulic, and economic relation- <br />ships which exist at specific locations. Similarly, measures designed <br />to manage damaQe susceptibility alter econOMic relationships which exist. <br />The basic relationships that can display the hydroloqic, hydraulic, and <br />economic characteristics of flood plain management measures are the Staoe- <br />Damaqe relationship, Sta~e-Flow relationshin and the Flow-FreQuencv rela- <br />tionship. All others, such as Flow-Damage, Stage-Frequency and Oamage- <br />Frequency can be obtained from these basic three by combinations with a <br />common parameter. It is imoortant to understand what the basic relation- <br />ships are, and bow they are altered by the various measures, both bene- <br />ficially (on purpose) and adversely. On the following paQes each rela- <br />tionshin and the effect of each measure are described and illustrated. <br />The effect of several flood plain management measures is shown in <br />terms of the impact on the three basic evaluation relationships plus the <br />derived stage-frequency relationship because of its common reference in <br />planning reports. <br /> <br />EXHIBIT 1 <br />1 OF 12 <br />