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C153960 Contract
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Last modified
11/19/2009 11:43:13 AM
Creation date
10/5/2006 11:45:37 PM
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Loan Projects
Contract/PO #
C153960
Contractor Name
Riverside Technology Inc.
Contract Type
Grant
Water District
0
Loan Projects - Doc Type
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<br />. <br /> <br />. <br /> <br />Task 91 - Map Wells, Irrigation Systems And Irrigation Service Areas <br /> <br />Objective: <br /> <br />Map irrigation distribution systems served by diversion structures with average annual diversions <br />of 1,000 af and greater and their associated irrigation service areas using (1) irrigated parcels and <br />other GIS coverages and (2) input from water commissioners, water managers and water users. <br />In addition, map wells with capacity of 50 gpm and greater and assign to specific irrigation <br />service areas. This task will utilize GIS data developed in Tasks 89, 90, 92 and 94. <br /> <br />Background: <br /> <br />During Phase 1 and Phase 2, the Contractor will map irrigation service areas for Districts 64, 1, <br />2, and 3. The remainder is expected to be completed under Phase 3. In these four districts are <br />located approximately 8700 of the total 12,000 wells with 50 gpm or greater capacity (Table B-6, <br />SPDSS Feasibility Study, Final Report, October 2001). These wells, which represent 77 percent <br />of the total flow from wells, will be matched with irrigated lands. In these same four districts are <br />a total of 152 structures with annual diversion of 1,000 af and greater (Table B-2, SPDSS <br />Feasibility Study, Final Report, October 2001). These structures divert 50 percent of the total <br />average diversions in the study area. Thus approximately 50 percent of the surface water irrigated <br />lands (via 152 structures) and 77 percent of the groundwater irrigation (by 8700 wells) will be <br />assigned under Phase 1 and 2. <br /> <br />Approach: <br /> <br />91.1 Well Tabulation and Preliminary Groundwater Service Areas. A tabulation of an <br />estimated 12,000 wells with water rights and/or well permits having a capacity of greater than <br />or equal to 50 gpm are expected to be developed by the Systems Integration contractor using <br />the methodology and model from the RGDSS. A complete description of this methodology is <br />described in "RGDSS Spatial System Integration, Task 2.4: Wellfile Analysis-Tool <br />Development" (obtained at htto:llcdss.state.co.us/). The irrigated land served by an irrigation <br />well will be determined using the closest parcel method developed in the RGDSS described <br />in the memorandum "RGDSS Spatial System Integration, Task 3.1: Data Centered <br />Groundwater Model" (obtained at htto:llcdss.state.co.us/). Initial location information for <br />each of these wells will be from legal descriptions and existing information from HydroBase. <br />Locations and irrigation service areas will be updated using more precise and more recent <br />information from water conservation districts (i.e. GASP), water users, and the Division 1 <br />program on well locations and updating (as described in Task 92). This subtask will produce <br />an intermediate result of well locations and service areas that will be reviewed and refined <br />during meetings and visits to water users and water commissioners, described under Task <br />91.3 below. <br /> <br />91.2 Preliminary Irrigation Service Area Mapping and Initial Contacts. Preliminary <br />Irrigation service area will be identified and mapped using the irrigated field boundaries, <br />satellite images and orthophotos prepared under Tasks 90 and 89. In addition, the Contractor <br />will use GIS data available in the geodatabase described in Task 94 including small-scale <br />USGS hydrography maps, digital elevation models, digital raster files of 7.s-minute USGS <br />quadrangles, and other sources. Finally, the Contractor will use GIS coverages obtained from <br /> <br />Page 9 of 26 Pages <br />
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