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Comments <br />The StateMod rules provide the user flexibility in allowing a maximum annual debit or credit <br />(under or over delivery) (variables gdebt and gdebtx) and estimated flows from the Closed Basin <br />Project (iopsou(8,1)) and the Norton Drain (iopsou(10,1)). <br />Concerns <br />StateMod Rio Grande Compact operating rule provides the ability to estimate a spill from <br />Elephant Butte Reservoir that would erase any accrued debt by Colorado based on the annual <br />stateline flow. This option has limited application since a spill from Elephant Butte is more <br />complicated that the annual discharge at the stateline. Therefore the ability to accurately simulate <br />a spill is currently not available in StateMod. <br />Division 3 often obtains unpublished forecasts, sometimes at the middle of a month that are used <br />in daily administration. To date, this additional data has not been obtained and included in the <br />Rio Grande model. <br />Delivery of water to all modeled structures occurs in StateMod using the same basic logic, i.e. the <br />prior appropriation doctrine is used to determine which structures (if any) can legally, physically <br />and operationally divert or store water. These allocation operations occur in the surface water <br />model during every time-step (month), and consider the net immediate depletive effect of prior <br />diversions and pumping. Depletions caused by wells, however, can occur over a long period of <br />time (20 years or more). For example, depletions occurring in Month 20 from well pumping that <br />occurred in Month 1 cannot be curtailed -the depletions have already occurred as a result of <br />earlier pumping when no curtailment was necessary. <br />Daily Model Operation <br />Overview <br />StateMod has historically been used to develop monthly time-step water planning models. <br />However, water planning questions sometimes have an "operational" component that requires <br />looking at flows/diversion/etc. on a time interval smaller than one month. <br />Objective <br />Test StateMod's daily time step capability. Previous applications of StateMod have historically <br />been run using a monthly time-step. This enhancement was a natural evolution from the monthly <br />planning model. <br />Test Application <br />This enhancement to StateMod involves 1.) changes to StateMod's station files (diversion, <br />instream, reservoir, well and stream) to identify how daily data will be assigned. 2. Development <br />of daily input files, 2.) development of daily input files, and 3.) changes to the DMIs that extract <br />daily data from HydroBase. A test application for this enhancement was provided by the State, <br />Example No. 8. Hydrosphere ran the StateMod model with the Example No. 8 input data and <br />reviewed the output. The output indicated that the StateMod enhancement was operating as <br />intended. <br />A test application using the Rio Grande Model has not yet been completed; this effort will occur <br />during Task 15 -Phase 2 of the RGDSS Surface Water effort (Develop Phase 2 Model (Daily)). <br />C:Acdss\TaskS-5.doc StateMod Enhancements August 15, 2000 -Page 4 of 8 <br />