SPDSS_Task50-1_Phase2_ReviewExistingDataCenteredApproachforGW

^ Well location, capacity and active year by irrigation ditch ^ Native vegetation area by cell for each vegetation class ^ External inflow (rim inflow) area by cell for individual inflow areas ^ Well capacity by cell for each flowing well zone ^ Land cover area by cell for each classification ^ Irrigated meadow area by cell for each irrigation ditch Several of these categories may be applicable only to the RGDSS. 2.3.2 AGG Processing The program AGG (Block 6 on Figure 1) processes output files from program StateCU to verify that identification fields are consistent between GIS coverages and program StateCU files. Program StateCU may include simulation of individual structures or may combine multiple smaller structures in a local area. The program aggregates information from multiple structures and writes files for use in program StatePP that contain consistent identifier fields for these combined structures. It also facilitates quality control through steps such as comparing total canal length in GIS coverages with the sum of canal lengths for individual model cells and flags discrepancies. It also does similar checking on total irrigated areas by structure with the sum of irrigated areas from model cells. When discrepancies are noted in output files, an iterative correction process is required to reconcile the problems. Some manual editing is also required, especially for well ID files. Four output files are created that provide information to program StatePP. These files include information for canal leakage, irrigated lands, sub-irrigated crops and irrigation wells. 2.3.3 StatePP Processing The program StatePP (Block 9 on Figure 1) processes output files from program StateDGI and from program AGG to produce both steady-state and transient MODFLOW files for recharge, well, evapotranspiration and drain packages. This package is documented in a memo from HRS to Ray Bennett titled "RGDSS Ground Water, Task 36 -State Pre-Processor Modifications", dated 19 February 2003. Model framework information from GMS is also required for this processing. The package has provisions to define the processes that are included, allowing disabling of RGDSS-specific features. The program is controlled from a command file containing input and output file names and parameters for internal computations, and it provides summary reports for checking purposes. Program StatePP also combines flow information from the consumptive use analysis, which is associated with structures, and accumulates this information into the individual MODFLOW package files on a cell by cell basis. An individual cell may have parcels and wells that are associated with different structures, and different land use or crop patterns, which must all be reconciled. Program StatePP also has the capability to average data during preparation of transient data sets.