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Cumulative Effect Report on Plan for Future Depletions
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Cumulative Effect Report on Plan for Future Depletions
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Last modified
1/26/2010 4:37:29 PM
Creation date
6/4/2009 9:50:12 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8461.250
Description
Water Issues
State
CO
Basin
South Platte
Water Division
1
Date
3/29/2007
Author
Ted Kowalski, Alan Berryman
Title
Cumulative Effect Report on Plan for Future Depletions
Water Supply Pro - Doc Type
Board Memo
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Figure 3 shows the analysis for adjusting the percent water supply from native South Platte flow <br />development by region. Colorado proposes for the Initial Reporting Period of two years to use an <br />average for the 1998 through 2006 period for the percent of time that a July 1, 1997 priority water <br />right would be available for diversion. The analysis adjusts the initially assumed percent of native <br />South Platte flow development by region by the ratio of percent time between the 1998-2006 period <br />(33%) to the 1998-2002 period (53%) that a July 1, 1997 water right would be in-priority--that ratio <br />being 33% / 53% or 62%. The results of this analysis changes the percent water supply from native <br />South Platte flow development from 10% to 6.2% for the North region, 15% to 9.3% for the Central <br />region, and 10% to 6.2% for the South region. If the drought continues, Colorado in the future will <br />propose adjusting this percent even more to reflect the lack of native water for junior water rights by <br />using a more recent period average only such as 2003-2006 or some other rolling average to <br />determine monthly water availability by call records. <br />With these adjustments downward for the percent water supply from native South Platte flow <br />development, Colorado proposes that there is a corresponding increase in percent water supply from <br />water reuse. Colorado has begun a data collection effort with the major municipal water providers <br />to better define the percent water source mixes from the six categories of water sources. Initial <br />indications from major providers is that water reuse is increasing along with in-basin agricultural <br />conversions. Note that the water reuse sources have a net depletive effect for all months while in- <br />basin agricultural conversions have a net accretive effect for all months as shown in all the Figures 1 <br />and 2.
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