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The following hyper-links are self extracting pkzip files. Each contains four data files for each alternative that will be described in the text below. The data files contain output for the period of study, 1898 through 1997. Each file is approximately 1.7 megabytes in size zipped and 7 megabytes unzipped. Use your browser's "save file" function to save to a directory and then later execute the filename to unzip the files (i.e., run filename.exe). Each zipped file creates four files named filename.elm, filename.q1d, filename.q2d and filename.sgm. Filename.elm contains end-of-month elevation data for the reservoirs, filename.q1d and filename.q2d contain daily flow data for the dams and gage stations, and filename.sgm contains monthly storage data for the reservoir system. For example cwcp.exe creates cwcp.elm, cwcp.q1d, cwcp.q2d and cwcp.sgm.

Preliminary Draft EIS Alternatives

Eight alternatives will be presented in the preliminary Revised Draft EIS (PRDEIS). These alternatives were selected to provide the public the opportunity to understand the effects of each change in operating criteria being considered for potential inclusion in the preferred alternative to be identified in the Revised Draft EIS (RDEIS), which will be prepared following feedback from the public on the PRDEIS. In addition to the Current Water Control Plan (CWCP), the PRDEIS will present effects of three alternatives with varying levels of conservation in droughts (C18, C31, and C44), three alternatives that provide additional fish and wildlife benefits (FW10, FW15, and FW20), and one alternative that has a Mississippi River target at St. Louis (M66). The table below summarizes the eight alternatives to be presented in detail in the PRDEIS scheduled to be released in August 1998.

To provide additional fish and wildlife benefits, alternatives FW10, FW15, and FW20 have varying service levels through the navigation season. These benefits are provided by releasing additional water (increasing service levels) in either May through mid-June (FW10 and FW15) or April through mid-June (FW20). The value of the number in the ID is the amount of the increased release in thousands of cubic feet per second (kcfs) from Gavins Point Dam in normal years and with no downstream flood control constraints. Reduced service levels are provided during varying portions of the remainder of the navigation season. FW10 and FW15 have minimum navigation service provided in mid-July through mid-August with no flood storage evacuation allowed during this period, and they are spin-offs from alternative C31. Alternative FW20 is the past preferred alternative of the Draft EIS (DEIS). This alternative has a 20 kcfs increase in service level in May through mid-June followed by minimum service to navigation through October. It also has only a 7-month or shorter season in many years. It is a spin-off from an alternative that would have a computer ID of ABAA21, which is not one of the conservation alternatives selected for detailed presentation in the preliminary draft EIS. Extensions to the navigation season occur under this alternative only when there is above normal runoff to evacuate from the mainstem system.

  The eighth alternative includes an additional target release value, a 66,000-cfs target at St. Louis, Missouri, in addition to the normal navigation, water supply, and other release targets for Missouri River authorized purposes. This alternative is a spin-off from the C18 alternative. The St. Louis target is not always met under this alternative due to several constraints. First, tern and plover constraints in the May 10 to August 20 time frame cannot be exceeded. Second, ice conditions are assumed to limit releases to 24 kcfs after December 10.

  The following descriptions provide a link between the more detailed numbering system used for the DEIS and the abbreviated numbering system used for the eight PRDEIS alternatives: