1. South Platte Decision Support System Colorado Water Conservation Board and Division of Water Resources

2. South Platte DSS Republican River Division 1 except Republican (WD 65) and North Platte (WD 47) North Platte South Platte

3. DSS Approach

4. SPDSS Major Components  Data - Tabular and Maps  New Data - Irrigated Lands, stream gages, aquifer data, and observation wells  Tools - SW, GW, CU  User Involvement  Documentation & Product Distribution

5. Tabular Data  Stations –Streamflow –Climate (temp, ppt., evap.)  Structures –Diversions –Reservoirs –Instream Flows  Water Rights –Transaction –Net  Ground Water –Water Levels –Pumping Tests  Calls –Tributary –Mainstem  Other –Agricultural Statistics –Crop Growth Coefficients

6. Tabular Data Internet (WWW)

7. Tabular Data StateView

8. Spatial (Map) Data  Basemap –Hydrology –Roads –Cities and Towns –Public Land Survey (T-R-S)  Stations –Diversions –Reservoirs –Instream Flows –Climate  Irrigated Acreage –Water Source –Crop Type –Irrigation Method  Other –Average precipitation –Average evaporation –Canals –Drains

9. Spatial Data Typical Results Base Map Drainage Area, Rivers, Water Districts, Counties, Highways, etc.

10. Spatial Data Irrigated Acreage Mapping Irrigated Area, Crop Type, Irrigation Method, Water Supply

11. Consumptive Use StateCU

12. Soil Data Irrigated Acreage and Crop Type Surface Water Supply Data Climate Data Irrigation Method Supplemental Sources Ditch Efficiencies Locally Calibrated Blaney-Criddle Crop Coefficients StateCU Features

13. StateCU Typical Results CU, Shortage and IWR

14. StateCU Typical Results CU by Water Supply (SW and GW)

15. Colorado’s Ground Water Model Modflow (USGS)

16. Modflow Features  Geology  Aquifer Parameters  Pumping  Recharge  Boundary Conditions  Streamflows and Diversions  Springs  Drains  Evapotranspiration  Subirrigation

17. Modflow Typical Results Storage Changes

18. Modflow Typical Results Water Levels

19. Modflow Typical Results Proposed Pumping Impact

20. Colorado’s Water Resources Planning Model StateMod

21. StateMod Major Features Network System Monthly or Daily Time Step Prior Appropriation Doctrine Structure Types Diversions, Reservoirs, Instream Flows, Wells & Plans Operational Rules Complex water operations Graphical User Interface

22. StateMod Major Features (cont.....) Creates Base or Natural Flows Efficient Solution Method – Direct Solution Algorithm – Modified Direct Solution Algorithm Variable Efficiency Soil Moisture Accounting Call Reporting Plan Accounting

23. StateMod Typical Results Streamflow with and without Project

24. StateMod Typical Results Compact Delivery Vs Compact Call

25. SPDSS User Involvement  Feasibility Study  Advisory Committee Meetings  Peer Review Meetings –Consumptive Use –Ground Water –Surface Water –Irrigated Acreage Mapping

26. Product Distribution WWW or CD Compact Disk (CD) Internet (WWW)

27. More about SPDSS  Web Site –http://cdss.state.co.us  CWCB –Ray Alvarado (303) 866 - 3517 –ray.alvarado@state.co.us ray.alvarado@state.co.us  DWR –Ray Bennett (303) 866 - 3585 –ray.bennett@state.co.us