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Title: WRRCTR No.110 Groundwater Recharge and Coastal Discharge for the Northwest Coast of the Island of Hawai'i: A Computerized Water Budget Approach 
Author: Kanehiro, Brian Y.; Peterson, Frank L.
Date: 1977-07
Publisher: Water Resources Research Center, University of Hawaii at Manoa
Citation: Kanehiro BY, Peterson FL. 1977. Groundwater recharge and coastal discharge for the northwest coast of the island of Hawai'i: A computerized water budget approach. Honolulu (HI): Water Resources Research Center, University of Hawaii at Manoa. WRRCT technical report, 110.
Abstract: The basic objectives of this study were to determine the average annual recharge to the groundwater body and the fresh groundwater discharge at the coastline, as well as the aquifer characteristics for an arid area
located on the northwest coast of Hawai'i island between Kīholo Bay in the south and Puako in the north, and encompassing the land from the coast to approximately the 762-m (2,500-ft) elevation level. Of equal importance was the development of methodologies, namely, a computerized water budget and groundwater tidal analyses to calculate these quantities. The probable recharge to the groundwater body in this region was computed to be 143.83 x 10^6 m^3/yr (38 bil gal/yr). Due to the lack of hydrologic data for the area, a range of values was determined, with the maximum
average annual recharge being 264.95 x 10^6 m3 (70 bil gal) and the minimum being 719.15 x 10^5 m3 (19 bil gal). Since there are 26 km (16 miles) of coastline in this area, this implies a probable average daily flux of
15,006 m^3/km (6.38 mil gal/mile) of coastline. Three different calculations were obtained for the hydraulic conductivity
of the groundwater aquifer in the coastal region: two by tidal analysis, and a third based on the coastal discharge as determined by the water budget. The Werner and Noren method of tidal analysis gave an average value for Kz (hydraulic conductivity times average saturated depth of aquifer) in the vicinity of 'Anaeho'omalu Bay of 585,270 m^2/day (6.3 x 106 ft^2/day); the method by Cox gave a value for K in the same area of 1,027 m/day (3,369 ft/day). The coastal flux method gave a value for K of 2,771 m/day (9,092 ft/day).
Series/Report No.: WRRC Technical Report
Sponsorship: U.S. Dept. of the Interior and the Water Resources Research Center, University of Hawaii Grant/Contract No. 14-31-0001-6012 Project No. A-067-HI
Pages/Duration: vii + 83 pages
LC Subject Headings: Groundwater -- Hawaii -- Hawaii Island.
Groundwater recharge -- Computer simulation.
Kailua Kona (Hawaii)
Water-supply -- Hawaii -- Hawaii Island.

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