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WSP07128
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Last modified
1/26/2010 2:25:51 PM
Creation date
10/12/2006 2:06:18 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8220.101.09A
Description
Glen Canyon Dam/Lake Powell
State
AZ
Basin
Colorado Mainstem
Date
2/13/1990
Title
Draft GCES Research Flow Plan
Water Supply Pro - Doc Type
EIS
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<br />. FEB J5 '30 1~:2: <br /> <br />2. Question: 00 discharge tluctuations, ditterences in <br />minimum discharges, or different rates of change in daily <br />discharges (ramping rates) interact with other uses and <br />components of the Canyon to affect rates of sediment degradation? <br /> <br />8.-2.1. The are no significant relationships between the <br />ettects ot recreational use ot beaches and the magnitude in daily <br />discharge tluctuations, daily discharge minima, or rates of <br />change of daily discharge fluctuations. <br /> <br />Justification: Recreational use ot beaches for camping or <br />daily picnioking causes a certain amount of disturbance of <br />the beach surface. This surface may also be influenced by <br />other tactors such as wind and variances in diSCharges. <br />The.. intluencing tactor. may not be exclusive, as casual <br />observations support the concept that human use of beach <br />faces may exacerbate the erosional loss ot beach sands by <br />fluctuating discharges and possibly discharge rate changes. <br />Human us. of other parts of the beach surface may also <br />compound the amount of sand and other sediment moved by <br />wind. <br /> <br />Information Heeds: The information generated to test <br />hypothesis H.-1.1 will be used, in part, to test this <br />hypothesis. In addition, human use areas on the selected <br />beaches will be limited and will be sampled for changes in <br />microtopography during the period of a group camping <br />experienoe. If possible, paired beaches will be selected <br />with one kept off limits for camping. The change in beach <br />tace topography where there is human us. will be measured <br />periodically for erosional 108s to diSCharge connected <br />factors. Beach surfaces will be sampled for <br />microtopographic changes as in H.-l.I. <br /> <br />Research for testing hypothesis H.-2.1 should be done under <br />normal operating discharges, and controlled research <br />discharge. from constant to widely fluctuating (see H.-1.1). <br /> <br />The following are secondary hypotheses that will be tested <br />under the research program established to test the above H.-2.l <br />hypothesis. <br /> <br />~-2.1a. There is no significant relationship between the <br />effects ot recreational use ot beaches and the magnitude of daily <br />discharge fluctuations. <br /> <br />H.-2.lb. There is no significant relationship between the <br />effects of recreational use of beaches and the magnitude of daily <br />minimum discharges. <br /> <br />4 <br />
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