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<br />6. Future Floods--Intermediate R~onal and Stands.rd Prc!.1.~E.!. <br /> <br />Floods. <br /> <br />a. Future floods on Wolf Creek can be expected to inflict <br /> <br />progress i vely greater damages ~t Grana,!a wherever. the town' g BTndual <br /> <br />expansion results in imprudent de1fluopment on the natural flood plains. <br /> <br />Such floods need not necessari1Y" be greater than t.hose of the past <br /> <br />in tel'lDS of peak flows -- for l;ighE,r and more vi<lespread overflows <br /> <br />should be foreseen under any c:LI'eunlStances that multiply obstructive <br /> <br />structures in the floodvay area.. <br /> <br />b. Commonly referred- to a,g the "lOO-Yl,ar flood," the <br /> <br />Intel'lllCdiate Regional Flood is det'ined as having an average occurrence <br /> <br />frequency of once in lOO-years, at a de,gignated location, although <br /> <br />it ~ occur in any year and possibly even in sueeessi ve years. It <br /> <br />is generally representative of floods that have occurred in the past <br /> <br />and those that may be reasonab1;1 expected to reellr in the future. <br /> <br />More severe and infrequent, the Standard Project Flood is defined <br /> <br />as the flood that can be expected from the most se'vere combination <br /> <br />of meteorological and hydrological conditions that is considered <br /> <br />reasonably characteristic of the geographieal area in which thE! <br /> <br />drainage basin is located, excluding extremely rare combinations. <br /> <br />Representing a reasonable upper limit of expected flooding that <br /> <br />would rarely be exceeded, such upper. limit may oftentimes define <br /> <br />the economic ceiling to be applied in seeking flood protection, <br /> <br />c. Table 3 shows the flood characteristics of Wol f Creek <br /> <br />App. 3 <br />14 <br />