| Abstract: | Detailed water budgets calculated for southern and southeastern Oahu are used with a geographic information system to develop simplified methods for estimating areal water budgets for predevelopment and mid-1980‘s land use. The methods were applied to estimate water budgets for the Waianae area of western Oahu, and for north-central, southern, and southeastern Oahu. A water budget was calculated for windward Oahu by developing a separate geographic information system model of the area. The water budgets for these areas were combined into a single water budget for the entire island. The geographic information system model was used to calculate mid-1980‘s ground-water recharge to small areas of specific interest and the distribution of recharge by geologic formation.
The most significant changes in the water budget and ground-water recharge have occurred in north-central and southern Oahu as a result of large-scale agricultural development and urbanization by the mid-1980‘s. Runoff increased by 23 million gallons per day in southern Oahu where extensive urban areas have been developed. Evapotranspiration increased by 8 million gallons per day in southern Oahu and 28 million gallons per day in north-central Oahu as result of the 146 million gallons per day of agricultural irrigation. Ground-water recharge increased in both areas: by about 56 million gallons per day in southern Oahu and by about 32 million gallons per day in north-central Oahu. Predevelopment ground-water recharge to Oahu was an estimated 792 million gallons per day. Changes in land-use practices in the mid-1980‘s resulted in an estimated island-wide recharge of 880 million gallons per day. |
| Genre: | USGS Numbered Series |
| ProdID: | 6385 |
| Citation Author: | Shade, Patricia J.; Nichols, William D. |
| Citation Contributing Office: | USGS Pacific Islands Water Science Center |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | 38 p. |
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| Citation Publisher: | Geological Survey (U.S.) |
| Citation Series: | Professional Paper |
| Citation Series Code: | PP |
| Citation Series Number: | 1412-C |
| Citation Search Results Text: | Water Budget and the Effects of Land-Use Changes on Ground-Water Recharge, Oahu, Hawaii; 1996; PP; 1412-C; Shade, Patricia J.; Nichols, William D. |
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| Citation Year: | 1996 |
| Type: | citation/reference |
| Text: | Water Budget and the Effects of Land-Use Changes on Ground-Water Recharge, Oahu, Hawaii; 1996; PP; 1412-C; Shade, Patricia J.; Nichols, William D. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/pp/1412c/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/pp/1412c/report.pdf |
| Date Other: | Sun, 1 Jun 1997 00:00 -0500 |
| Publisher: | Geological Survey (U.S.) |
