Summary construction program (PB-1), fiscal years 1964 and 1965

Location and description.-Harlan County Dam and Reservoir is located on the Republican River in south-central Nebraska near Republican City in Harlan County. This project is one of the reservoir projects in the plan for flood control and water resources development in the Republican River Valley in Colorado, Nebraksa, and Kansas, and the Missouri River Basin. The Harlan County Dam is of rolled earth-fill construction about 12,000 feet long and rises 107 feet above the streambed. Floodwater releases are made through nine sluice gates located in the base of the concrete gravity spillway section and irrigation releases are made through sluice gates located on each side of the spillway section. The reservoir at full pool level has a capacity of 850,000 acre-feet, of which 500,000 acre-feet is allocated to flood control, 150,000 acre-feet to irrigation, and 200,000 acre-feet to sediment reserve.

Authorization.-1938, 1941, and 1944 Flood Control Acts.

Present condition.-The embankment section of the Harlan County Dam was completed about 1952. The embankment section of the dam is basically an impervious earth fill with a sand blanket on the upstream slope protected by a 3-foot layer of riprap over 1 foot of spalls. This riprap protection extends from the top of dam at elevation 1982 down to elevation 1928. In 1957 and 1958 high winds caused severe wave action which resulted in displacement of considerable riprap and bedding while the reservoir was at elevation 1948. Repair of this damage was initiated in November 1958 and completed in February 1959 at a cost of $132,000. During March 1963, winds with velocities up to 63 miles per hour were experienced. This storm caused widespread damage to the slope protection over nearly the entire length of the upstream face of the dam between elevations 1943 and 1952, exposing the underlying previous fill at intermittent locations and building a berm or beach at about elevation 1943. The south irrigation structure has been damaged due to ice conditions and will be rebuilt. Inasmuch as the north intake structure is similar in design, it also will be strengthened while the conservation pool is drawn down for the riprap repair.

The Harlan County Dam is a key project in the Kansas River system of flood control reservoirs, a part of the plan for the Missouri River Basin. In addition, it provides storage for the Bostwick irrigation project which will ultimately provide for the irrigation of 86,240 acres. Currently 47,727 acres have been developed and are being irrigated. The riprap originally placed on the dam has proven inadequate for the severe wave action experienced at this project. The lay of the reservoir permits westerly winds to generate severe waves down the length of the reservoir. The force of these waves and the frequency of occurrence makes it mandatory that the riprap facing on the upstream face of the dam be reconstructed and strengthened to prevent further deterioration which might ultimately impair the structure's safety.

Fiscal year 1965.-The requested amount of $1,600,000 will be applied to: Rehabilitation of slope protection. Rebuild irrigation intake structures. Engineering and design__

Supervision and administration_..

Total....

$1, 366, 200 21, 800

100, 000 112, 000

1, 600, 000

It is proposed to accomplish the entire rehabilitation during fiscal year 1965 to avoid repetitive drawdown of the reservoir and to minimize possibility of additional damage to the remaining riprap and the underlying earthfill. The entire rehabilitation should be accomplished as early in fiscal year 1965 as possible so as not to interfere with impoundment of water for the 1965 irrigation season.

Comparison of Federal cost estimate.-No estimate previously submitted to Congress.

Summary construction program (PB-1), fiscal years 1964 and 1965

OPERATION AND MAINTENANCE, GENERAL

Mr. BOLAND. Turning to Operation and Maintenance, General, please insert the justifications in the record at this point. (The justifications follow:)

1. Navigation

JUSTIFICATION OF ESTIMATE

(a) Channels and harbors.-The budget estimate of $8,420,000 provides for maintenance of bank stabilization structures and channel dredging on the Missouri River between Sioux City, Iowa, and the mouth. A stable bank is necessary to prevent erosion of valuable farmlands and provide a secure alinement for flood control levees along the banks, as well as provide a navigable channel.

2. Flood control

(a) Reservoirs.-The budget estimate of $1,082,000 includes funds for nine. flood control projects, covering their annual requirements for the necessary operation and ordinary maintenance of project facilities; labor, supplies, materials, and parts required for the day-by-day functioning of the projects; and periodic maintenance, repairs, and replacements. In addition, funds are provided for the scheduling of flood control reservoir operations and for studies on flood control storage allocations and benefits at operating and scheduled Bureau of Reclamation projects in the Missouri River division during fiscal year 1965. The estimate includes first time maintenance requirements on two projects and an increased requirement of one project due to its reaching a more fully maintained status

(b) Channel improvements, inspections and miscellaneous maintenance.-The budget estimate of $242,000 provides for the annual maintenance requirement on I local flood protection project, and the inspection of 56 completed works within the division during the budget year.

3. Multiple-purpose projects including power

The budget estimate of $4,107,000 provides for the operation and maintenance of six multiple-purpose projects. Annual requirements are for the necessary operation and ordinary maintenance of project facilities; labor, supplies, materials, and parts required for the day-by-day functioning of the projects; and periodic maintenance, repairs, and replacements. The estimate includes increased requirements on two projects due to their reaching a more fully maintained status.

The budget estimate of $26,000 provides for accomplishing the work essential to the administration and enforcement of specific laws enacted for the protection of navigation.

LT. COI. S. W. PINNELL, ASSISTANT DIRECTOR OF CIVIL WORKS FOR CENTRAL DIVISIONS, OFFICE OF THE CHIEF OF ENGINEERS EDWIN W. NELSON, CHIEF, ENGINEERING DIVISION, NORTHCENTRAL DIVISION.

VERNON O. PETERSON, CHIEF, PROGRAM DEVELOPMENT BRANCH, NORTH-CENTRAL DIVISION.

Mr. BOLAND. We turn now to the North-Central Division. The committee is pleased to welcome Lt. Col. S. W. Pinnell, Assistant Director of Civil Works for Central Divisions, Office of the Chief of Engineers; Mr. Edwin W. Nelson, Chief of the Engineering Division, North-Central Division; and Mr. Vernon O. Peterson, Chief of the Program Development Branch, North-Central Division.