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REEDS BAY SMALL BOAT HARBOR

(See p. 41 for project drawing.)

Reeds Bay, a small inlet in the shoreline of Hilo Bay, is shoreward of the existing Federal deepwater harbor. Reeds Bay is protected from direct wave attack by deep water waves but may be subjected to 5-foot wind waves generated in Hilo Bay. Prevailing winds are from the south and southwest. The bottom at Reeds Bay is composed of hard lava formations with a superficial layer of silt and sand; the shore is rocky except for a short sandy beach at its west end.

The "Interim Report of Survey of the Coasts of Hawaiian Islands, Harbors for Light Draft Vessels" recommended Federal adoption of a small boat harbor at Reeds Bay to provide for a breakwater 870 feet long extending eastward from the existing shoreline to shelter a flared harbor basin of about 9 acres in area and suitable for the accommodation of approximately 270 boats. The entrance channel would be 120 feet wide and 12 feet deep. The State of Hawaii would develop the berthing and shoreside facilities. The Reeds Bay Boat Harbor project was authorized by Congress in the River and Harbor Act of 1965. No funds for advance design or construction have been appropriated.

The estimated cost and economics of the project are as follows:

[blocks in formation]

Wailoa Stream and its tributary streams, Waiakea and Kawili, are in the Waiakea section of the city of Hilo on the northeastern side of the island of Hawaii. The drainage basin comprises about 19.6 square miles and extends from about the 2,500-foot elevation of Mauna Loa to the ocean, draining through Waiakea Pond and Wailoa River

The project, authorized by the Flood Control Act of September 3, 1954, provided for clearing the natural stream bed of Kawili Stream in the upper reaches, a combination channel 355 feet long and levee 88 feet long to divert the Kawili Stream flow into Waiakea Stream, a combination channel 333 feet long and levee 350 feet long to divert the combined flows of Waiakea and Kawili Streams into a long and narrow swale area. It also provided for a combination channel 1,100 feet long and levee 800 feet long to protect the University of Hawaii Hilo campus dormitory, with a diversion levee 325 feet long to divert the flows from the swale area to a new excavated channel 4,680 feet long. Earth levees totaling 6,510 feet border the excavated channel. The project also includes a new 122foot concrete box culvert, an 80-foot concrete bridge, and an interior drainage structure. The project was completed in August 1965, at a cost of $1,075,857.

In July 1966, heavy rains caused flooding in the Hilo area. An estimated 3,000 to 4,000 cubic feet per second passed through the flood control channel as the first test of the works. The channel carried the runoff and prevented considerable damage in the area. The flow did expose the toe of the slope protection at two locations of the channel. These are not considered serious enough to warrant repairs at this time.

WAIPIO RIVER, KOHALA-HAMAKUA COAST

(See p. 43 for survey map.)

This study was authorized by the Flood Control Act of 1962 and provides for a multiple-purpose feasibility study to determine the need for improvement and development of the stream and basins of the Waipio River and Kohala-Hamakua coast area. The Kohala-Hamakua coast area is located on the northeast slope of Kohala Mountain at the northern end of the island of Hawaii. Waipio River is located in Waipio Valley, the most prominent valley on the Hamakua coast. The total objective of this study is to consider potential flood control measures, water supply, power generation and recreational aspects of the valley, its watershed and adjacent drainage areas in the Kohala Mountains. The investigations completed to date were confined to the drainage basin of Waipio Valley, which covers an area of approximately 25 square miles. The coastal area which encompasses approximately 1 square mile, is subjected to recurring floods which has been a discouraging factor in the development of Waipio Valley. Also, development of Waipio's water for use on lands adjacent to Waipio Valley is a matter of special concern to the State of Hawaii. Development of additional water supply sources in the Waipio drainage basin or in adjacent drainage areas is a major resources requirement of the State to develop the leeward coast of Hawaii due to the serious water shortages in recent years and an expanding demand resulting from economic growth.

Investigations to date show that improvements for flood control within Waipio Valley are not economically justified. Possible multi-purpose reservoir sites were also investigated, but because of fractional benefit-cost ratio were eliminated. Future studies will concentrate on alternative reservoir sites in the upper reaches of Kohala Mountain. This study is scheduled for completion in fiscal year 1970.

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