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<br />FES 05 '90 17:32 <br /> <br />c, <br /> <br />occupies the new high water zone (Holmgren, pars. comm.). <br /> <br />Lnforaation Meeds: Response curve ot motor boat wake effects <br />on beaches under different dam operation scenarios need to <br />be developed, and the distribution, density and risk status <br />of the new Eunhorbia needs to be determined. <br /> <br />fl.-ll.2. Tnere is no significant relationsnip between the <br />trout population of the Lee's Ferry reach and fishing activities, <br />especially catcn and release or keep relationsnips. <br /> <br />Juetification: Tne trout population in the Lee's Ferry reach <br />is intensively managed. The population is a result of <br />stocking and natural regeneration, minus those lost to <br />.trsnding, angler damage and keep, and migration downstream. <br />Few apparently migrate downstream and thus stranding and <br />angler influence are tn. primary 10s6 factors. <br /> <br />Inforaation Heeds: Stranding losses will be determined under <br />H.-4.1. The effects of anglers on the population should be <br />determined through evaluation of Arizona Game and Fish <br />records. <br /> <br />B. Effects of Raftina and Camnina Activities <br /> <br />12. Question: How does rafting/camping affect other canyon <br />resources? <br /> <br />11.-12.1. There is no significant relationship between the <br />sediment volume of beaches and recreation (also see H.-2.1). <br /> <br />Justification: Kuman impacts on the beaches during docking, <br />loading and camping activities may move sediment into <br />position to be removed by wind and/or water action. The <br />amounts of ..diment disturbed and actually lost has not been <br />accurately determined. It is possible that human impacts may <br />play a significant role in what appears to be a continuing <br />deqradatlon of camping beaches. The justification for this <br />study i8 a180 addressed in H.-2.1 <br /> <br />Inforaation Weeds: Beach surface microtopography will be <br />measured under the research program established for H.-2.1. <br />By using paired beaches that receive different intensities <br />of camping use, and by experimentally manipulating beaches, <br />it should be possible to separate beach surface changes tied <br />to human activity and those tied to natural physical <br />processe.. <br /> <br />15 <br />