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Item Description Fok, Yu-Si en_US 2010-10-04T21:53:49Z 2010-10-04T21:53:49Z 1973-10 en_US
dc.identifier.citation Fok Y. 1973. A preliminary report on urban hydrology and urban water resources: Oahu, Hawaii. Honolulu (HI): Water Resources Research Center, University of Hawaii at Manoa. WRRC technical report, 74. en_US
dc.description.abstract The major tasks under Phase II of the project were to: (1) adapt and evaluate several existing watershed simulation models for their applicability under local conditions, (2) expand the data collection effort in the research watersheds, and (3) identify problem areas for subsequent study. The instantaneous unit hydrograph (IUH) theory was explored in detail. The results indicate that the successive routing method developed by Nash (1957) has better applicability on urban watersheds near Honolulu. The parameter, N, representing the conceptual number of reservoirs, decreases as urbanization progresses. In the adaptation of the Kentucky Watershed Model (KWM), it was found that the basic logic of continuous balancing of the water budget within a given watershed is applicable to Hawaiian conditions. The development of KWM to meet Hawaiian requirements would entail two to three more years as has been the experience in Kentucky. A preliminary computer program has been established and simulated daisy streamflow from Kalihi watershed obtained. In the Road Research Laboratory Model (RRL) adaptation, there was poor correlation between the rainfall and runoff data collected from the St. Louis Heights research watershed. This may be attributable to deficiencies in instrumentation as well as inexperience in data colIection, as the data used for simulation were obtained during early stages of the study. In the multiple regression method for determining peak flow, the statistical method appeared to establish a reasonable empirical relationship between peak flow and urbanized area of a given watershed, as well as between time to peak and urbanized area. However, additional data are required to fully establish such a relationship. Of the mathematical models tested for rainfall-runoff relationship, the nonlinear time variant method gave the best peak discharge simulation. Also Nash's IUH model (1957) gave good simulation. All watershed simulation models tested indicated that more hydrological data are prerequisite to the development of a reliable urban hydrology simulation model for Oahu. The data collection program has been expanded to include evaporation, soil moisture, wind speed, solar radiation, and water quality in addition to rainfall and streamflow records gathered since initiation of the project. en_US
dc.description.sponsorship OWRR Project No. B-028-HI, Grant Agreement No. 14-31-0001-3873 The progr&ms and activities described herein were supported in part by funds provided by the United States Department of the Interior as authorized under the Water Resources Act of 1964, Public Law 88-379; the City & County of Honolulu; and the Water Resources Research Center, University of Hawaii. en_US
dc.format.extent vi + 44 pages en_US
dc.publisher Water Resources Research Center, University of Hawaii at Manoa en_US
dc.relation.ispartofseries WRRC Technical Reports en_US
dc.relation.ispartofseries 74 en_US
dc.subject.lcsh Watersheds -- Hawaii -- Oahu. en_US
dc.subject.lcsh Runoff -- Mathematical models. en_US
dc.subject.lcsh Watersheds -- Electromechanical analogies. en_US
dc.subject.lcsh Watersheds -- Data processing. en_US
dc.subject.lcsh Hydrology -- Hawaii -- Oahu. en_US
dc.title WRRCTR No. 74 A Preliminary Report on Urban Hydrology and Urban Water Resources: Oahu, Hawaii en_US
dc.type Report en_US
dc.type.dcmi Text en_US

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