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The geologic objectives within the long-term monitoring program are to monitor factors that <br />will permit the evaluation of the sediment budget within the canyon. The GCES/GIS data <br />base will help identify trends in sediment storage as well as topographic and substrate <br />change in backwaters and beaches. Small scale surficial geology data at the 1:2,400 level is <br />being collected by the Reclamation Remote Sensing Section and Dr. Jack Schmidt (University <br />of Utah). Figures 12, 13, and 14 show examples of how a GIS can be used to model the loss <br />of exposed surficial geology between a flow regime of 5,000 ft3/s and 35,000 ft3/s. <br />The hydrologic and biologic objectives within the long-term monitoring program are to <br />monitor entities such as the aquatic food base (cladophora, midges, etc.), riparian vegetation, <br />and fish sampling sites. Prompted by Pucherelli et al. (1983), the Reclamation Remote <br />Sensing and Geographic Information Section is taking the lead in monitoring New and Old <br />High Water vegetation within each monitoring site at the accuracy level provided by the <br />1:2,400 orthophoto base maps. Another study of riparian vegetation at a very large scale is <br />being conducted by the NPS to examine vegetation community changes in 5- by 10-meter <br />quadrants over time. Fish sampling data will be entered into the GCES/GIS data base as <br />georeferenced points with tabular data tied to them. <br />Additional objectives of the long-term monitoring program are to inventory and monitor listed <br />species such as the bald eagle (Haliaeetus leucocephalus), peregrine falcon (Falconidae <br />peregrinus), southwestern willow flycatcher (Empidonax traillii) and humpback chub (Gila <br />cypha). Most of these data will exist in the data base as georeferenced points with tabular <br />data linked to them. <br />The cultural objectives of the monitoring program are to assess the effects of the operation <br />of Glen Canyon Dam on sites that have tribal, cultural, and archaeological value. Most <br />cultural data should exist in the GOES/GIS data base as polygon data to facilitate the <br />monitoring of physical impacts upon the site. These data are available through the NPS <br />inventory and monitoring program and the Native American tribes. <br />The recreational objectives of the long-term monitoring program are to include data on <br />camping beaches, recreational values, aesthetics, input, outtake, and accident records. These <br />data are available from the NPS, Arizona Game and Fish Department, and Native American <br />tribes. <br />20