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<br />Fig. 20. Effect of Flood Control Reservoir <br /> <br />Q <br /> <br />, <br />I <br />I <br />I <br />I <br />/ <br />-~ <br />"",,--'-WITH <br />~ <br /> <br /> <br /> <br />NC <br /> <br /> <br />NC <br /> <br />Q <br /> <br />to <br /> <br />f <br /> <br />.0001 <br /> <br />s <br /> <br />I <br />I <br />I <br />I <br />I <br />__-""WITH <br />~- <br />~ <br /> <br /> <br />1.0 <br /> <br />f <br /> <br />.0001 <br /> <br />The functton of a flood control reservoir is to store flood waters dur1nq <br />storm periods and release them dur1n~ periods of lower flow. Because the <br />flow of the stream UDD" which the reservoir is located is interrupted. the <br />flood frequen~v at all locattons ~ownstrea~ can be altered, oener,11v hv <br />lowerfnq the flow for a oiven f~uen~v of event. The maqnftude of this <br />fTow reduction ~y be ~11 or llrqe dependfnq upon the sfze of the reser- <br />voir. the ..~nftude of the event. and the location of the reservoir 1n re- <br />latton to the downstreaM nofnt. No other functional relatfonshfns are df- <br />;reetly affected 1'1,'" a reservoir. The sketch dfsnlays the fmpact of a ri!S- <br />ervofr immediately downstream on pre-~ofect functtonal relationShips. <br /> <br />Systems of reservoirs can exhibit more complex affects because of the in- <br />fluence of c~lex operatinq rules and va~in~ priorities in release Datterns. <br />Reservoirs can result in lnnq term chanqes in downstream convevance (bv scour <br />or deposition) which chanqes the stage-flow relatfonshin an~ by inducinq de- <br />velooment onto the flood Dl~in which cnuld affect the stan~-dama"e rel~tionshiD. <br /> <br />EXHIBIT 1 <br />3 OF 12 <br /> <br />III <br />