Dam: PHYSICAL DATA Type: Rolled earthfill. Height: 85 feet (average). Length: 8,300 feet. Spillway: Type: Uncontrolled service chute with paved sill. Outlet works: Type: Controlled. The Rathbun Reservoir will be operated to store excess runoff from an area that is subject to violent storms of intense rainfall. Floods have occurred on the Chariton River in 31 of the past 46 years. Although extensive channel improvements have been made along the Chariton River, reservoir control is required to provide adequate flood protection to those areas not protected by the completed channel improvements. At Centerville, Iowa, approximately 16 miles downstream from the proposed damsite, the Chariton River exceeded flood stage 19 times in the past 25 years. The Rathbun Reservoir will control the runoff from 539 square miles of land. It will provide benefits to 90,300 acres not otherwise protected in downstream reaches of the Chariton River Basin, and will reduce flood stages affecting 57,000 additional acres now protected by other means. In conjunction with other authorized units of the Missouri River Basin program, it will share in protection of 300,000 acres along the Missouri River, and will provide some reductions in Mississippi River floods. During the period 1939 to date, aggregate damages amounting to over $20 million have occurred in the Chariton Basin, below the Rathbun damsite. At 1963 prices and conditions, this would amount to $25,600,000 of which about $13,300,000 would have been prevented by the reservoir. In addition to flood control, this reservoir will provide 182,000 acre-feet of storage to be used to supplement water flows for abatement of stream pollution; relief from droughts; and a large body of water for recreation usage. Fiscal year 1965.-The requested amount of $1,750,000 will be applied toContinue land acquisition.... Initiate construction of dam-embankment, spillway, and outlet works... Initiate construction of administrative facilities. Initiate acquisition of permanent operating equipment. Engineering and design. Supervision and administration... Total.... $750,000 436, 000 280, 500 22, 000 150, 000 111, 500 1,750,000 The amount requested for construction of the dam is required to meet the closure date. The amount requested for land acquisition is the minimum requirement for construction area and to maintain an orderly schedule of acquisition prior to closure. The amount requested for administrative facilities and permanent operating equipment is required to provide repair and storage space for Government forces inspecting the construction. Non-Federal costs.-None. Status of local cooperation.-None required. Comparison of Federal cost estimates.-The current Federal cost estimate of $24,200,000 is an increase of $600,000 over the latest estimate ($23,600,000) submitted to Congress. Lands and damages increased $2,661,000, based on provision for additional lands due to increasing the storage capacity, to include 50,000 acre-feet for water quality control, and increases in estimated real estate values. Relocations increased $475,000 due to raising the full pool elevation to provide additional storage, and price level advances. The dam feature decreased $4,143,000, based on more detailed design studies and adoption of a notched spillway in lieu of a concrete chute spillway. Provisionfor additional access and service roads and development of additional recreation facilities resulted in an increase of $1,618,000. Engineering and design and supervision and administration decreased $100,000, based on a reanalysis of requirements. Price level advances and minor adjustments in other features resulted in an increase of $89,000. Summary construction program (PB-1), fiscal years 1964 and 1965 Location. Near the village of Alida and about 8 miles downstream from Milford, Geary County, Kans., on the Republican River about 10 miles above its confluence with the Smoky Hill River to form the Kansas River near Junction City, Kans. Authorization.-1954 Flood Control Act. Type: Uncontrolled service chute, paved sill. $61,200,000 1 17, 544, 000 43, 656.000 17, 544,000 I 17,544,000 0 61,200,000 13,409,000 13,945,000 27,354.000 16, 000, 000 45 71 Capacity: Peak discharge, 539,400 cubic feet per second (approximate). Qutlet works: Type: Single 21-foot horseshoe conduit. Capacity: At full pool, 23,100 cubic feet per second. Gates: Control, 2 wheel gates; emergency, 2 wheel gates. This project is a unit of the authorized system of reservoirs to reduce flows in the Kansas River Basin, and, in turn, is an integral part of the comprehensive flood protection plan for the Missouri River Basin. The Milford Reservoir will control the runoff from 3,796 square miles of land in the Republican River Valley downstream from the Harlan County Reservoir. There are no authorized or proposed reservoirs on the main stem of the Kansas River. Control of runoff from the lower section of the Republican River Valley is required to assure protection of highly productive agricultural lands along the Kansas River and Missouri River downstream from the Kansas River. The design heights of the projects at the Kansas Citys, Topeka, and Manhattan, Kans.; the works under design for Lawrence, Kans.; and the agricultural levees along the Missouri River downstream from Kansas City are predicated on the reduction in flood crests to be effected by the Milford and other Kansas River Basin reservoirs. The 1951 flood with a discharge approximately twice as large as the 1903 flood, inundated the Argentine, Armourdale, Central industrial, and Fairfax industrial districts in Kansas City and substantial portions of Topeka, Manhattan, and Lawrence, as well as farms and smaller towns along the entire length of the Kansas and lower Missouri Rivers. The 1951 flood emphasized that completion of flood control reservoirs and improvements in the Kansas Basin should not be delayed. Studies of this flood and a potentially greater flood, reaffirmed the need for this reservoir, and other reservoirs, in a system to provide flood control. The Kansas River was the major source of floodwaters that caused primary losses of $870,237,000 in the Missouri River Basin during the 1951 flood. More than $550 million of these losses were in the area downstream from Milford Reservoir. Recurrence of the 1951 flood under 1963 conditions and prices would cause estimated damages of about $1,260 million. As a unit of the existing and authorized flood control program, Milford Reservoir would reduce this damage by an estimated $107,360,000. The Kansas Water Resources Board, in a cooperative study, concurred in conclusions that control of the lower Republican River by Milford Reservoir is essential to any plan for flood control and water conservation in the Kansas River Basin. The board also indicated a desire for maximum feasible use of the reservoir storage for conservation purposes. Fiscal year 1965.—The requested amount of $16 million will be applied toContinue acquisition of land. Continue relocation of State and county roads, municipal facilities, Continue construction of outlet works, embankment, spillway, and Continue clearing of reservoir....... Initiate development of public use areas. Continue procurement of permanent operating equipment. Supervision and administration.. Total___ - $5, 000, 000 5, 639, 000 590,000 3, 255, 000 200, 000 200, 000 15, 000 326, 000 775, 000 16, 000, 000 The funds requested are needed for orderly continuation of land acquisition; to meet the requirements for continuing construction contracts; to initiate new relocation and construction contracts required to maintain an orderly project schedule and for continuation of engineering and administrative functions. Non-Federal costs.-Local interests are required to make reimbursement for costs of water supply storage being provided in accordance with Public Law 85-500. The preliminary estimate of the amount of the reimbursement for water supply is $17,544,000. Status of local cooperation.-Pursuant to a request by the State of Kansas, design of the project includes provision for 300,000 acre-feet of storage for future water supply. The Kansas State Legislature has passed bill No. 403, which specifically provides for method of repayment of non-Federal cost of including future water supply storage in reservoirs. Comparison of Federal cost estimate. The current Federal cost estimate of $61,200,000 is the same as the latest estimate submitted to Congress; however, adjustments have been made between features in the overall project. 32-218-64-pt. 1——24 Summary construction program (PB−1), fiscal years 1964 and 1965 Item Lands and damages. Relocations. Reservoir. Dam. Roads Recreation facilities. Buildings, grounds, and utilities. $23,500,000 $6,635, 900 Balance to complete after fiscal year 1965 (6) $6, 964, 100 6, 011, 900 396, 000 1,904, 800 52, 700 870,000 65, 100 225, 200 4,820, 500 6,334, 100 40, 900 50,000 200,000 114, 700 Location. The damsite is located on the Delaware River about 5 miles above the mouth in Jefferson County, Kans., and about 3 miles north of Perry, Kans. Authorization.-1954 Flood Control Act. Benefit-cost ratio.-4.3 to 1. |