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Concerns <br />Operation of Rio Grande Model requires monthly input data to simulate several key basin water <br />rights and administrative practices (e.g. Rio Grande Compact -monthly forecasted basin <br />inflows). Daily model operation will require that these monthly files be either a) used by <br />StateMod internally and used to interpolate daily values; orb) converted to daily inputs via Data <br />Management Interfaces (DMIs). Implementation and testing of either feature is not expected to <br />occur until Task 15. <br />Groundwater Wells <br />Overview <br />Groundwater is a significant source of water for agricultural and other water users in Division 3. <br />As such, and because of stream-aquifer interactions, groundwater use must be represented in any <br />surface water modeling effort of the Rio Grande in order to accurately represent depletions and <br />other hydrologic effects. <br />Objective <br />Test StateMod's ability to simulate groundwater pumping, including administration of well water <br />rights and their depletive effects on surface water. This enhancement was necessary because <br />groundwater represents a large percentage of overall water supply and consumption in the Rio <br />Grande Basin. <br />Test Application <br />A significant design and development effort was required to allow the representation of <br />groundwater pumping in StateMod modeling system. It required major changes to the StateMod <br />code, the HydroBase database and DMIs, and the StateMod input files. <br />Prior to releasing the first edition of the groundwater pumping enhancements to StateMod, the <br />State worked with Hydrosphere to verify the conceptual design and review interim versions of the <br />code and model output. The State provided several simple example problems with the first <br />edition of the groundwater pumping enhancements to StateMod. Hydrosphere ran these <br />examples, reviewed the output to verify that the code was working as intended, and provided <br />feedback to the State. Over a period of several months, several issues with the code were <br />addressed and the well simulation capabilities were judge to be performing as desired. This was <br />confirmed by running a test application provided by the State, Example No. 7. Hydrosphere ran <br />this example and reviewed the output, which indicated that the StateMod enhancement was <br />operating as intended. <br />A much more rigorous test of the groundwater pumping enhancement to StateMod was the <br />application to the Rio Grande Model. The addition of groundwater pumping to surface water <br />model greatly changed the model behavior and results. This led to additional changes and <br />adjustments to the way the groundwater pumping code operated and the way the input data was <br />developed. Hydrosphere worked very closely with both the State and the Relational Database <br />Contractor during development of DMIs capable of extracting and formatting the necessary <br />model inputs. <br />C:Acdss\TaskS-5.doc StateMod Enhancements August 15, 2000 -Page 5 of 8 <br />