Geology topics
Publications and source records attributed to Carl L. Lawrence.
The purpose of this report is to provide information on the extent, depth, frequency of flooding that will affect the lands adjacent to the upper Yahara River in Dane County, Wis.
The purpose of this report is to provide information on the extent , depth, and frequency of flooding of the lower Yahara River in Dane County, Wis. The report contains discharge-frequency data for flood peaks, flood–frequency profiles, and the regional flood– (100-year flood) inundation limits for the lower Yahara River. The study reach is in southern Dane County extending from part of the shoreline of Lake Waubesa downstream through Lake Kegonsa to the Dane-Rock County line. Specifically the parts of the shoreline of Lake Waubesa included are those in and south of section 8, T. 6 N., R. 10 E. on the west shore and the south half of section 3, , T. 7 N., R. 10 E. on the east shore. (See figure 2.) The reach is 21 river miles (31 km) long. The Wisconsin Legislature has enacted flood–plain–Zoning legislation (1965) to encourage economic use of flood plains and to minimize flood losses. This act gave counties, cities, and villages the responsibility of enacting, administering, and enforcing reasonable and effective flood-plain regulations. This report is a sequel to earlier reports by Lawrence and Holmstrom (1971) and Holmstrom and Lawrence (1971). The earlier reports provided much of the same information, but the scale of the maps defining limits of flooding was much smaller. This report , using Orthophotographs at a scale of 1 in - 100 ft., provides greater detail. The report is based on conditions existing in 1971. All elevations are referenced to mean sea level, datum of 1929.
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The city of Madison is establishing standards for flood-plain zoning and land-use planning. The evaluation of flood potential is a necessary factor to be considered before such standards are established and put into effect. Purpose and scope. The purposes of this report are to determine the magnitude and water surface elevations of the regional (100-year) flood for both existing and future conditions, to determine their limits of flooding, and to analyze maximum hydraulic capacities of the channel system of Starkweather Creek. The regional flood is defined by the Wisconsin Department of Natural Resources (1968, p. 94) as a flood that occurs on an average of once in 100 years and "which is representative of large floods known to have occurred generally in Wisconsin and reasonably characteristic of what can be expected to occur on a particular stream". The reaches evaluated are (1) Starkweather Creek and West Branch Starkweather Creek, for a distance of 6.0 river miles from the mouth at Lake Monona upstream to the U.S. Highway 51 crossing north of Truax Field; and (2) East Branch Starkweather Creek (2.8 river miles), from its confluence with the West Branch near Milwaukee Street upstream to a point near the Interstate Highway 90-94 crossing.
The State of Wisconsin, as a result of recent legislation, is establishing new, and upgrading old, minimum standards for flood-plain regulation. These standards require evaluations of the flood potential of many streams in Wisconsin. This report provides an evaluation of flood potential for the Yahara River in the 13-mile low-water channel reach from the dam at the outlet of Lake Kegonsa downstream to the county line. Prepared by the U.S. Geological Survey in cooperation with the Dane County Regional Planning Commission and the Wisconsin Department of Natural Resources, this flood-inundation study gives the computed water-surface elevations and defines the areal limits of inundation for the regional flood. The regional flood is defined by the Wisconsin Department of Natural Resources as a flood having an average frequency of occurrence of-once in 100 years and "which is representative of large floods known to have occurred generally in Wisconsin and reasonably characteristics of what can be expected to occur on a particular stream."
The profile and an approximate outline of the flooded area for the regional (100-year) flood has been determined for a 21.3-mile reach of the Yahara River, Dane County, Wisconsin, from State Highway 113 at the head of Lake Mendota downstream to the dam at the outlet of Lake Kegonsa. The reach consists principally of lake surface, which results in large amounts of flood-storage volume. The regional-flood profile ranges from 1.7 feet to 3.1 feet above normal low-water elevation.