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<br />000061 <br /> <br />South Platte Decision Support, 5 <br /> <br />pumping amounts, ungaged return and tributary flows, reservoir operations rules, and river gain/loss <br />relationships. <br /> <br />Models: In his 1994 CWRRI paper, Initiatint: a Water Manat:ement Decision Support System for <br />the Platte River Basin, Robert Leaf reviewed some of the streamflow models that have been used in <br />the South Platte Basin. Models reviewed included the network model BESTSM, network <br />optimization models MODSIM and CRAM, and SAMSON, a complex, physically based model that <br />attempts to simulate all of the processes occurring in a stream-aquifer system such as the lower <br />South Platte. <br /> <br />BESTSM and MODSIM are in use today in several applications. A version ofBESTSM, developed <br />by Boyle Engineering of Lake wood, was modified for use by Denver Water as their system model. <br />MODSIM, developed at CSU by John Labadie, was the initial water resource planning model within <br />\ \ f\ ~I'w- 1', ~ \. <br />theCRDSS. ~2s; ""-~ fCy\<o(cCL ~ 1 ~:",\)~.~",w... ~Q I <br /> <br />SAMSON was developed at CSU in the 1980's, primarily by Jorge Restrepo and Hubert Morel- <br />Seytoux. It has extensive input data requirements, not all of which are available. The model has <br />been applied to some parts of the South Platte for calibration and verification, but the complexity of <br />the data and computing power required apparently halted development several years ago. Among <br />potential users, there seems to be a paradoxical wish for a model that would yield the detailed output <br />promised by SAMSON, but without the complex input. <br /> <br />SPWRMS contains an accounting model for water rights that simulates "legally prescribed" flows <br />using rule routing (lag/loss table). For simulation of flows higher or lower than average, the lag/loss <br />table must be adjusted. In order to adjust the lag/loss table, either professional judgment or output <br />from another model (or both) are required. SPWRMS updates flows from telemetered data, <br />however; for real-time administrative operations the flow is corrected at each gauging station. <br /> <br />The Northern District (NCWCD) has been working for several years on a point flow model for the <br />lower South Platte; it is now in the final stages of development and will be attached to SPWRMS in <br />1995. The Northern Point Flow model is an accounting software that will be used to detennine <br />reach gains and losses between gage points. Although still not a physically based model, this <br />software will help improve evaluation of well withdrawals and aquifer recharge operations. <br /> <br />Interfaces: The feasibility study for the CRDSS, completed in 1993 by <br />Dames&Moore/CADSWES, investigated three types of user interface: command line, fonns based, <br />and interactive graphics. A command line interface requires all requests for action to be typed in. <br /> <br />04/11/95 <br />