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WSPC01928
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Last modified
7/29/2009 8:03:53 AM
Creation date
10/9/2006 3:05:07 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8283.200
Description
Colorado River Basin-Colorado River Computer Models-Colorado River Decision Support System-RAY
State
CO
Water Division
5
Date
3/25/1991
Title
HYDROSS-HYDROSS Version 4.10
Water Supply Pro - Doc Type
Report/Study
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<br />Advanced Concepts <br /> <br />. t . <br />Available FlQw~ . .... . <br />.:./ <br /> <br />5.2.3 Station Losses and Available Flow: Station losses occur in reaches where the <br />natural flow at the upstream station is greater than the natural flow at the downstream station. <br />Station losses have no water right, although they have fIrst claim on any water flowing <br />between two stations. <br /> <br /> 01 <br />- <br />.. <br /> D2 <br />- <br /> <br />Numbers at left are natural flows at stations. <br />Dl and D2 are diversions <br /> <br />D2 has higher priority than Dl. <br /> <br />If D2 requires 5 units, Dl may divert 15 units because 20 units are lost <br />between Dl and D2. <br /> <br />5.2.4 Reach Loss and Available Flow: Reach losses occur when a <br />stream reach between two stations is modelled as a canal. The loss is expressed as a percentage of <br />the flow, and is a substitute for station losses (because there is no historical record of losses for the <br />reach). <br />Reach losses, like station losses, have no water rights although they have fIrst claim on any <br />water flowing in the reach. <br />a. b. and c are stations <br />90% of the flow at (a) reaches (b). <br /> <br /> Dl <br />.' <br /> ~- <br />b> <br /> ~- <br /> D2 <br />c> <br /> <br />80% of the flow at (b) reaches (c). <br /> <br />If there are 'n' units of water at (c) not required by D2, then Dl may divert (n + <br />0.72) units (0.9 x 0.8 = 0.72) <br /> <br />5.2.5 Reach Loss and Return Flow: Reach losses may come back <br />to the system as return flows, but not during the month they are lost. <br />The reason for this is that the fundamental algorithm for allocating water <br />says: fIrst let the water run free, then subtract diverted amounts from the downstream flows. This is <br />the whole basis for the priority scheme, and allows us to move through the system in priority order <br />without regard to spatial (upstream/downstream) order. <br />If reach losses were allowed to return in the month they were lost, they might be re-used out <br />of turn and it would enormously complicate the task of subtracting them out. <br /> <br />5.2.6 Water Ril!ht Date: A priority date of 9999 is used internally as a special case <br />by the model for storing water which would otherwise be wasted (flow out of the bottom of the <br />basin). <br />In this case (only) natural flow is not available if it is serving a project need, such as keeping <br />the stream bed wet so project flow doesn't have to 'pay the freight' of station losses on the way to <br />doing it's job. <br />The priority date of 9999 is used again to determine .the 'flow available' (record code 611 in <br />the ODS fIle). <br /> <br />March 25, 1991 <br /> <br />HYDROSS 4.1 <br /> <br />Page 31 <br />
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