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STATE OF COLORADO <br /> <br /> <br />úÎÑÎËÜÙÎæÜÉØËúÎÏÊØËÇÜÉÔÎÏûÎÜËÙ  <br /> <br />ùØÍÜËÉÐØÏÉÎ×ïÜÉÈËÜÑëØÊÎÈËÚØÊ  <br />1313 Sherman Street, Room 721 <br />Denver, Colorado 80203 <br />Phone: (303) 866 - 3441 <br />Fax: (303) 866 - 4474 <br />www.cwcb.state.co.us <br />  <br /> <br /> <br />Bill Ritter, Jr. <br /> <br />Governor <br /> <br />Harris D. Sherman <br /> <br />TO: Colorado Water Conservation Board Members <br />DNR Executive Director <br /> <br /> <br />Jennifer L. Gimbel <br />FROM: Andy Moore <br />CWCB Director <br /> <br /> <br />Dan McAuliffe <br />DATE: November 4 , 2008 <br />CWCB Deputy Director <br /> <br />Agenda Item 2 7 l , November 18 - 19, 2008 Board Meeting <br />SUBJECT : <br /> Water Supply Planning and Finance Section <br /> En - bloc Non - Reimbursable Investments <br /> MODFLOW Enhancements for CDSS <br /> <br /> <br /> <br />Introduction <br />The U.S. Geologica l Survey (USGS) is requesting funding for enhancements to MODFLOW for <br /> the amount of $ 50 ,000 . MODFLOW is a USGS <br />groundwater flow model utilized in CDSS to aid in water resources planning. The proposed <br />enhancemen ts were solicited by CWCB and DWR in order to make MODFLOW more useful in CDSS <br />modeling. The USGS is contributing $12,500 in matching funds. <br /> <br />Recommendation <br />Staff recommends that the Board request the General Assembly authorize $ 50 ,000 from the Constructio n <br />Fund to be appropriated to the Department of Natural Resources for allocation to the USGS to perform <br />. <br /> <br />Background <br />CDSS first started utilizing MODFLOW during the development of the Rio Grande DSS. During model <br />development, the need was found for enhancements to MODFLOW that would address some of the <br />groundwater modeling issues in the San Luis Valley. The CWCB and DWR coordinated with the USGS <br />to incorporate these enhancements into MODFL OW, which have been successfully implemented in <br />CDSS. <br /> <br />During the current development of the alluvial groundwater model in the South Platte DSS, a need was <br />found for further enhancements to MODFLOW. The USGS was asked to submit this application to <br />perform these enhancements. These enhancements include the following two items: 1) The capability of <br />tracking individual model stress input components, from model - input fields to the volumetric budget <br />output tables generated by MODFLOW; and 2) A user - specified opt ion for continuation of model <br />execution despite solver nonconvergence. <br /> Watershed Pr otection & Flood Mitigation er Supply Planning & Finance <br /> <br />