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<br />.. <br /> <br />. <br /> <br />. <br /> <br />FES 05 '90 17:31 <br /> <br />=='.13 <br /> <br />8. QUeStion: How are recreational values influenced by <br />characteri.tics of diecharge from Glen canyon Dam, such as <br />discharge fluctuations, minimum discharges and rates of change of <br />fluctuating discharges. <br /> <br />~-8.l. There is no significant relationship between <br />recreational response variables (angler safety and rafting <br />safety, satisfaction, experiential quality and economics) and the <br />magnitude of seasonal or daily discharge fluctuations, minimum <br />discharges or the rate of change of fluctuating discharges. <br /> <br />Justification: Use of the Canyon for recreation is of <br />primary concern for those who manage the system. The <br />response variables indicated in ~-8.1 are used as <br />measurements to determine how recreation is functioning <br />within the environment created by nature and humans in the <br />Canyon. If a response variable indicates a significant <br />negative response to some factor managed by humans, then <br />serious consideration must be given to decisions made <br />relative to that factor. <br /> <br />Information Weeds: All variations in discharge parameters <br />need to be tested against recreational satisfaction, <br />experiential quality and economics. Mean and minim~ <br />discharges need to be tested against safety, angler access <br />and satisfaction. Rates of change in fluctuations need to <br />be tested against angler sarety. <br /> <br />Secondary hypotheses can be developed from primary <br />hypothesis ~-8.1 that will relate each recreational response <br />variable individually to each discharge variable. This is an <br />extensive list and is not presented here. <br /> <br />9. Question: Are there surricient camping beaches, in <br />location, numbers, and surtace area, during high discharge <br />periOdS (i.e., 31,500 cfa or possibly 33,200 cfs) to satisfy the <br />needs of the recreational rafting community based on the NPS <br />acceptable carrying capacity of the Grand Canyon system? <br /> <br />H.-9.1. There is no significant relationship between <br />availability of camping beaches and maximum normal operations <br />discharges from Glen Canyon Dam (i.e., 31,500 cfs or 33,200 cfs). <br /> <br />Justification: Fluctuating discharges from Glen canyon Dam <br />create waves of fluctuatinQ high rlow stages through the <br />Canyon system. These high flows may inundate portions of <br />campinQ beaches at times when they are occupied. Assuming <br />the high flow stages may occur at any time, availability of <br />camping beaches may be limited, possibly requiring <br />readjustments in recreational use during high discharge <br />periods. <br /> <br />13 <br />