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'RECREATION ENGINEERING <br />.M... y-?-• <br />j FAX N0. :3035455883 26 2002 01:69PM P2 <br />? , . ?` . . .. . . <br />A fiathcr ela.boration of m.y hydraulic anelysis in designing the• structures was includcd with the <br />diar,rams of certaan strnchares demotstrating control, water depth, and the necessary . l?ei?t of the <br />dam structures to mairrtaia controL I bave relied upon the same type of calculations m designing <br />otb,er similar structures. The caleulatiar.s are conservative and ha've been verified to work in <br />numerocrs sEtiings. The calculations w11 be fietd verified, wbich may cause minpr adjustmenis. <br />"As- bw'lt" mmpPing of the structures or their etevatioris wM be used to firther support the <br />calculations, as wW persorwl observa.tions of the caursc structures at various tlows. <br />] C. <br />T1ie stuctures should be dcsigmed to continue to perf.orm under -a variety of flow conditions,. <br />;nciuding aniicipated higb flows. 'la other words, whY'te the desigu for the VVhitewater Park will <br />allow for the crcati?on of whitevvat.er features at a flow of 250 cfs safliciesrt ta attract experienc,ed <br />Whitewater kayakers, the cowse is iiesigaed to also function well gt a iange of flows up to 2040 <br />cfs, as such higher flnws havc historically occurred within the reach o£the Gunmsson River where <br />the Whitewater Park is proposed. If the structures are designed tao narrow3Y, then the strucYures <br />wili not be sble to contuiue to create wriitewater featlues for sty acceptable rdnge of f low levcls. <br />The more narrow the stivclure, the sooner that higber flows will cause the'stivctuies to flush, <br />creating iru:onsistEnt wave perFornnancc and sm,ail, ungredictable eddies. Tiais wouid -thereby <br />unnece'ssarily limit the optimai performanc;e of the-Whitewa.tcr Park and reduce,its. aktracxiveness <br />to many potgntial users. 1Nithout a sufficient range of flows at which the structuies are • <br />fuactiona,], the Whitewater Park would not be able ta aehieve its purpose ofproviding a '. <br />reczeational amenity available and attmctive to a variety of boaters,and varibus mfts for the <br />boating season. ' ' . . <br />Uge of the Whitewatcr Parlt. <br />From my experience in constructmg whitewater boating courses, I believe that Gunnisons' <br />yVhi.tewater Park vvill be used by a wide range of users .. . , <br />Thc nature of whitcwater paddle sports, today is that "park and play" kwAing, which is Ieayaking <br />in a constracted whitewa,ter cc>urse as opposed to runnmg a iang streteh of a river, is the number • <br />one growth- area in the s?port. What has bccome so attractive about wbitewater kayaking is daat it <br />no longer reqaires the participant to h.c:ad out for an eatire day or weekend to a remote - <br />dcstination to enjoy the sport. Far many kayakers, urban whitewaterparks aDow them to practiee <br />ffieii sport after work, on a lunch break, or during any sborter'opening in their'day. It also <br />provides an oppartunrtY for more individuals to becozne invalved in the sport by providing apportunities withi.n their own communities. . •. <br />Sin Iy, ' /? i? <br />GaryG?l i.'LacY, P. . <br />Reoreatian, Engineering aad Placinnng <br />? . ? • . ? 2 <br />bWz4 ? ? . .