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CHAPTER 3 DATA ASSESSMENT 3.1 INTRODUCTION A major component of the SPDSS is the ability to provide observed water resource data in a readily accessible and easy to use format; e.g., provide data for data sake. In addition, the filling of data gaps, quality control reviews and the digitizing of selected hard copy information is required in order to allow the SPDSS to provide the types of modeling capabilities identified in Chapter 2, Needs Assessment. The purpose of this chapter is to: • Inventory data sets that pertain to the groundwater and surface water resources of the South Platte and North Platte River basins in Colorado • Assess the adequacy of these data sets with respect to their spatial coverage, period of record, completeness and reliability • Determine what additional data need to be obtained for development of the necessary SPDSS data sets and the estimated cost and time required for obtaining these additional data This inventory, analysis and determination of additional required data is accomplished for the following categories of data: • Streamflow • Surface water diversions • Transbasin diversions • Reservoirs (physical data and use) • Surface water rights • Wells (location and physical data) • Groundwater pumping • Geologic structure and aquifer properties • Groundwater levels • Consumptive use • Water budget • Climate • Snow survey • Landuse and irrigation service access (including agricultural statistics) • Geographic information system 3.2 STREAMFLOW Streamflow data are important as a basic water resource need and for the water rights administration and modeling requirements. Streamflows throughout Division 1 and Water District 47 (in Division 6) vary due to: • Source (e.g., rainfall, snowmelt, springs and seeps) • Interaction with groundwater as reaches gain or lose water • Direct diversions removing water from the system p:data\gen\spdss~final report\chapter 3.doc 3 -1 October 31, 2001