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Pertinent Data

Authorization: Flood Control Act of 1965, approved 27 October 1965; Public Law 89-295, HD 232, 89th Congress, 1st Session.

Location: At river mile 100.2 on the Walnut River, a tributary of the Arkansas River, about 2 miles northeast of El Dorado in Butler County, Kansas.

Status: Complete.

Purpose: Flood control, water supply, water quality control, and recreation.

History of Construction: Construction began in October 1973 and the project was completed for full flood control operation in June 1981.

Type of Structure: The rolled earthfill dam is 20,930 feet long, including the spillway, and rises to a maximum height of about 99 feet above the streambed.

Hydrologic Data: The flood of record occurred in June 1979. The estimated peak discharge at the El Dorado dam site (which was under construction at the time) was 41,200 cfs and the volume was 52,400 acre-feet. The estimated average rainfall above the dam site was 7.5 inches.

Pertinent Lake Data:

Watershed  . . . . . . . . . . . . . . . . . . 247 square miles

Shoreline . . . . . . . . . . . . . . . . . . . . 98 miles

Surface acres

                Conservation pool . . . . . . . .  8,000 acres

                Flood pool . . . . . . . . . . . . . .  10,700 acres

Elevation

                 Conservation pool.  . . . . . .  1,339 ngvd 

                Flood pool  . . . . . . . . . . . . . 1,347.5 ngvd

Capacity

                Conservation pool . . . . . . . . 157,000 acre-feet

                Flood pool . . . . . . . . . . . . .  . 236,200 acre-feet

Dam

                Length . . . . . . . . . . . . . . . . .  10,350 feet

                Height above streambed .  . 99 feet

Outlet Works

                1 outlet conduit. . . . . . . . . .  11.5 x 15.75 feet in diameter (oval)

                1 low flow sluice  . . . . . . . . .  2 x 3 feet

                1 water supply pipe . . . . . . .  3 feet in diameter

                1 uncontrolled spillway . . . .  350 feet in width