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<br />~ - ~IIMi5k.orl <br />CWCB Prcsclltalioll. 1-25-2006 <br />H. Costs for tamarisk control and revegetation Jrc based on current work being performed by the National Invasive <br />.species Council on an economic model that incorporates Integrated Pest Management practices with planning, <br />design, control, revegetJtion, monitoring, and maintenance activities. Estimated costs for the three rivers are: <br /> <br />'1'11 r <br /> <br />a) c 5: '.con0ll11C summarv <br /> Average Cost per <br />River Total Costs' Average Cost per Acre-fool of Average Cost <br /> Acre Trea led * \Vater Preserved* Der Mile' <br />Colorado S6,soo,000 $1,000 S880 $43,000 <br />Arkansas $45,000,000 $1,550 $840 $230,000 <br />Purgatoire $6,300,000 $700 $850 $44,000 <br />'I'ributarie.s $5,300,000 $800 $880 $29,000 <br /> <br />If Rounded values from Tables 2 & 4 <br /> <br />9. If tallllJrisk control and revegetation Occurs on any of these rivers, the water lost to the atmosphere through <br />evapotranspiration \\Till remain wilhin the groundwater and/or surface water regimes. <br /> <br />10. The costs of water retained \..ithin the hydrologic system of $840 to S880 per acre-fool should be compared to the <br />value placed on the purchase of senior water rights because tamarisk is always using water even during a drought. <br /> <br />11. The work performed by the Tamarisk Coalition on over 800 miles of river system in Colorado was supported by <br />$.50,000 [rom C\VCB; $9,000 from the Purgatoire River \Vater Conservancy District; and $42,000 of in-kind <br />support froIlll\.Iesa State College, CSU, TNC, and several counties, river districts, and soil and water conservation <br />districts. <br /> <br />12, The protocols developed under this project could be used to generate accurate inventories and maps for the other <br />major watersheds in Ule state that have known tamarisk infestations; Le., Gunnison, Dolores, \Vhite, San .Juan, Rio <br />Grande, South Platte, and Republican rivers. This would provide a complete understanding of the current and <br />future water loss impacts for Colorado due to tamarisk infestations. <br /> <br />Final Note: This invcntOl}' data and associated mapping is already being used to develop watershed solutions on all three <br />river systml1s. <br /> <br />.l <br />