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shortcomings that were not identified in the overall review and the Level One decision criteria. No <br />additional concerns were noted. <br />Summary of Notable Attributes and Deficiencies <br />Attributes <br />Easy to understand solution methodology. <br />? <br />Very competent documentation for the model and its operation. <br />? <br />Well commented and easy to follow source code. <br />? <br />Flexible return flow procedures. <br />? <br />Provisions for in-stream flow requirements. <br />? <br />Flexible for addition of new water rights, including conditional rights. <br />? <br />Model is widely used by federal agencies and is fully supported with periodic updates and <br />? <br />enhancements. <br />Deficiencies <br />The model does not readily allow for multiple storage accounts/ownerships within a <br />? <br />reservoir. <br />The model is not structured to allow water rights exchanges. <br />? <br />Use of the model requires external development of a pristine, virgin flow database. It may <br />? <br />be possible to utilize the USBR's virgin flow database developed for CRSS, however it <br />may involve additional effort by the CRDSS Project Team to fully understand the data or <br />to make modifications to the database as required for the CRDSS. <br />Availability of the HYDROSS source code is not certain and may be subject to certain <br />? <br />restrictive license conditions. <br />Concerns related to a possible error when modeling return flows accruing to the stream in <br />? <br />the same time-step because of the inability of the model to iterate a solution. <br />3.0 CONCLUSIONS AND RECOMMENDATIONS <br />The HYDROSS model is not recommended as the core water rights planning model for the CRDSS. <br />The model was determined to be unacceptable for the CRDSS because of the deficiencies noted <br />above for functions that are considered essential to the goals and objectives of the CRDSS. <br />5 <br />A275 05.10.94 1.15-4 Fosha, Hyre <br />