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Integrating Hydrosphere's Analysis into FWS OpStudy Modeling <br />Consistent with Colorado's Future Depletion Plan Projections <br />Sept 3, 2003 <br />Back r? <br />Colorado's Future Depletions Plan anticipates that six different categories of water <br />development will occur in the South Platte basin, each with their own January-December net <br />accretive/depletive "signature" at Julesburg. <br />1. New trans-basin diversions Accretive to flows <br />2. Non-tributary groundwater " <br />3. Agricultural to municipal conversions " <br />4. Conservation Neutral <br />5. Re-use of reusable return flows Depletive to flows <br />6. Native South Platte storage " <br />Hydrosphere's analysis only evaluated the effect of diversion and storage associated with <br />only the last two activities (#5 and #6) on reducing daily flows, including peak flows. <br />Hydrosphere ignored any accretive effects from these activities (e.g., return flows from the <br />use of stored water), as well as the accretive effects of activities #1 through #3. Their analysis <br />provides good information on likely South Platte flow reductions during periods of high flow, <br />but little information about overall flow impacts during other times. <br />Colorado's Illustrative Tool provides a means of estimating average net monthly and annual <br />impacts on flow at Julesburg under an assumed mix of the six water supply sources serving an <br />assumed new population. Generally speaking, under currently-assumed water supply mixes <br />in an "average hydrologic year", the pattern of net accretions and depletions looks something <br />like this: <br />Cumulative Accretions/Depletions Effects at Julesburg <br />in an Average Hydrologic Year <br />s <br />.. <br />? <br />0 <br />? <br />a <br />d <br />a? <br />? <br />d <br />a <br />? <br />Month