North_Canadian_Reach_1_and_2_Hydrologic_Study_

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North Canadian Reach 1 and 2 Hydrologic Study, 2025 (0)

Description: The 1983 Final Order for the Beaver–North Canadian River Alluvium and Terrace Groundwater Basin (Reach I) established a groundwater basin area of approximately 426,000 acres (666 square miles). Under Findings of Fact 6 and 7 of that Final Order, the basin boundary was defined as the area having a saturated thickness of at least 5 feet as of July 1, 1973. The boundary was derived from the results of Simulation 5 (Plate 13) in Davis and Christenson (1981).The 1983 Final Order boundary was smaller than the boundary established by the 20-year hydrologic update because portions of the original study area were excluded from the Davis and Christenson (1981) model domain. Approximately 100.7 square miles (64,448 acres) were excluded because they were designated as no-flow areas. An additional 60.8 square miles (38,912 acres) were excluded from the equal proportionate share simulation because they had little or no saturated thickness (less than 5 feet) during the 1957 steady-state model calibration. Thus, approximately 161.5 square miles (103,360 acres) of the 845.7-square-mile study area were excluded from the simulations used to determine equal proportionate share. Following Simulation 5, an additional 16.5 square miles of the modeled area had saturated thicknesses below 5 feet. Consequently, approximately 178 square miles of the study area were considered to have little or no saturation, resulting in the 666-square-mile basin area reported by Davis and Christenson (1981).The updated hydrologic investigation by Ryter and Correll (2015) used the same general study area as Davis and Christenson (1981), which was based on the Oklahoma Geological Survey Woodward Hydrologic Atlas surface-geology map (Morton, 1980). Unlike the Davis and Christenson (1981) model, the Ryter and Correll (2016) model incorporated areas having little or no saturated thickness. These areas were retained because groundwater levels fluctuate throughout the simulation period, and recharge occurring in areas of limited saturation may contribute to groundwater flow toward areas of greater saturated thickness or may be captured by pumping.The updated groundwater basin boundary for Beaver–North Canadian River Alluvium and Terrace Groundwater Basin, Reach I, used in the 2026 final order was delineated using updated geologic mapping of northwestern Oklahoma published by the Oklahoma Geological Survey for the Buffalo, Woodward, and Fairview quadrangles (Stanley and Suneson, 2002; Stanley, 2002; Stanley and others, 2002), together with a technical review by Oklahoma Water Resources Board (OWRB) staff geologists. The revised boundary maintains the lateral extent established by the 1983 Final Order while incorporating the updated geologic interpretation. Excluding Canton Lake and Fort Supply Lake, the updated groundwater basin area is approximately 853 square miles (545,863 acres).Governing Statute for Boundary ModificationOklahoma Statutes, Title 82, Section 1020.4; OAC 785:30-9-5 — Updating Hydrologic SurveysThe Oklahoma Water Resources Board is required to review and, if necessary, update hydrologic surveys at least once every 20 years following issuance of the final order determining maximum annual yield.Selected References:Davis, R.E., and Christenson, S.C., 1981, Geohydrology and numerical simulation of the alluvium and terrace aquifer along the Beaver-North Canadian River from the Panhandle to Canton Lake, northwestern Oklahoma: U.S. Geological Survey Open-File Report 81–483, 42 p. Ryter, D.W., Correll, J.S., 2016, Hydrogeological Framework, Numerical Simulation of Groundwater Flow, and Effects of Projected Water Use and Drought for the Beaver-North Canadian River Alluvial Aquifer, Northwestern Oklahoma. U.S. Geological Survey Scientific Investigation Report 2012-5177. Stanley, T.M., Suneson, N.H., 2002, Geologic Map of the Buffalo 30’x 60’ Quadrangle, Ellis, Harper, Woods, and Woodward Counties, Oklahoma. Oklahoma Geologic Survey Quadrangle 39. http://ogs.ou.edu/docs/OGQ/OGQ-39-color.pdfStanley, T.M., 2002, Geologic Map of the Woodward 30’x 60’ Quadrangle, Ellis, Dewey, Rogers Mills, and Woodward Counties, Oklahoma. Oklahoma. Oklahoma Geologic Survey Quadrangle 40. http://ogs.ou.edu/docs/OGQ/OGQ-40-color.pdfStanley, T.M., Miller, G.W., Suneson, N.H., 2002, Geologic Map of the Fairview 30’x 60’ Quadrangle, Alfalfa, Blaine, Dewey, Garfield, Kingfisher, Major, Woods, and Woodward Counties, Oklahoma. Oklahoma Geologic Survey Quadrangle 41. http://ogs.ou.edu/docs/OGQ/OGQ-41-color.pdf

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Copyright Text: Original Datasets: Oklahoma Geological Survey Modifications: Oklahoma Water Resources Board

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North_Canadian_Reach_1_and_2_Hydrologic_Study__2025 (MapServer)