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APPLICATION OF WATER QUALITY MODELING TO REGULATING LAND DEVELOPMENT IN PROTECTED DRINKING-WATER-SOURCE AREAS: A CASE STUDY ON THE KAO-PING RIVER WATERSHED, TAIWAN

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  701P0904,  . (doi: 10.13031/2013.17385)
Authors:   Chun-hsu Lin and Te-thui Huang
Keywords:   QUAL2E, GWLF, water quality modeling, riparian buffers

The purpose of our project is to build a management system for protected drinking-water-source areas where land development is restricted for drinking safety. Under this system, a protected area is further divided into two different zones. In the first zone, any type of land development is prohibited. In the second zone, development is allowed only when a development permit with more environmental protection requirement is granted by a responsible government agency. Three compensation programs are then proposed to reduce the resistance from landowners of the properties to be included into the source-water-protected areas. Thus, how to delineate a protected area subject to different levels of regulations is of concern while initiating the compensation programs.

In this paper, we demonstrate a case study on the Kao-Ping River Watershed, a subtropical watershed with highly heterogeneous land uses and widely ranged elevations. Through this case study, we empirically examined the proposed management and compensation systems. In which, the targeted abatement of water pollution was regarded as the basis for determining the needed areas of two types of protected zones. Following this principle, computer models were utilized as the planning tools. Arc/View GIS software and two water quality prediction models, QUAL2E and GWLF, were applied to repeatedly simulating the effects of pollution reduction after the development restrictions are imposed with different acreage of two development-restricted zones. The modeling results for the optimal areas of the protected zones were further used for estimating compensation amounts based on one of the three following schemes: land banking, conservation easement, and transferable development rights.

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