Sewage Irrigation and Recharge Consequences, Oahu

by Gordon L. Dugan, (M.ASCE), Prof. of Civ. Engrg.; Univ. of Hawaii at Manoa, Honolulu, Hawaii,
L. Stephen Lau, (M.ASCE), Prof. of Civ. Engrg. and Dir.; Water Resources Research Center, Univ. of Hawaii of Manoa, Honolulu, Hawaii,

Serial Information: Journal of the Environmental Engineering Division, 1981, Vol. 107, Issue 4, Pg. 699-711

Document Type: Journal Paper


By the year 2000 the island of Oahu, Hawaii, is projected to have a water demand that equals its fully-developed freshwater (essentially ground-water) supply. columns appears that reuse and reclamation are presently the most feasible means of water supplementation for the island. Recently completed field projects on Oahu, covering a 7-year period, involving the application of secondary sewage effluent to grassland and sugarcane revealed that: (1) It does not have a detrimental effect on the vegetation or public health; (2) it serves as a fertilizer source and a sewage disposal method; (3) the quality of the leachate below the root zone is similar to that produced by agriculture practices; and (4) at least 50 percent of the applied liquid reaches the ground water when the ridge and furrow method of irrigation is employed.

Subject Headings: Water reclamation | Sewage | Irrigation | Groundwater quality | Islands | Water demand | Vegetation | Public health and safety | Hawaii | United States

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