10.2190/XRP3-RFRB-RPE7-W6QK XRP3RFRBRPE7W6QK 5 Establishing Local Water Quality Management Priorities 257 277 20020509 20020509 20020509 20020509 XRP3RFRBRPE7W6QK.pdf http://baywood.metapress.com/link.asp?target=contribution&id=XRP3RFRBRPE7W6QK 3 William P. Darby Francis Clay Mc Michael Robert W. Dunlap Washington University Engingeering and Public Policy Carnegie-Mellon University A methodology which can be implemented by water resources regulatory authorities to establish local water quality management priorities for urban watersheds is presented. The model utilizes an approach to management which does not require extensive field sampling and investigation, but rather makes use of readily-available data. Indirect indicators of watershed characteristics and land use planning are used to predict overall water quality conditions of the watersheds. The methodology is applied to Allegheny County, Pennsylvania, a region which can be divided into eighty-two separate, independent drainage areas. Indirect indicators are used here to forecast the overall water quality of those watersheds for which no direct measurements exist, to single out problematic watersheds for possible regulatory action, and to identify those watersheds which should receive an in-depth study to characterize water quality conditions. This methodology is currently used by Allegheny County Health Department to establish implementation priorities for the small urban streams in the region. U. S. Congress, <i>An Act to Amend the Federal Water Pollution Control Act</i>, Public Law 92-500, 92nd Congress, October 18, 1972. U. S. Department of Commerce, Bureau of Economic Analysis, Population and Economic Activity in the United States and Standard Metropolitan Statistical Areas, Historical and Projected 1950-2020, Environmental Protection Agency, PB 216-607, 544 pp., July 1972. W. P. Darby and E. G. Duvernoy, <i>Management of Urban Watersheds: An Assessment for Regulatory Action</i>, Allegheny County Health Department, Pittsburgh, Pa., 129 pp., 1973. W. P. Darby, F. C. McMichael and R. W. Dunlap, Urban Watershed Management Using Activity Indicators to Predict Water Quality, <i>Water Resources Research, 12</i>, pp. 245-252, April 1976. N. Dalkey, <i>Delphi</i>, The Rand Corporation, P-3704, October 1967. J. E. Overall and C. J. Klett, <i>Applied Multivariate Analysis</i>, McGraw-Hill Book Company, New York, 500 pp., 1972. G. H. Ball, <i>Classification Analysis</i>, Stanford Research Institute, Menlo Park, California, SRI Project 5533, 117 pp., November 1970. M. M. Tatsuoka, <i>Multivariate Analysis</i>, John Wiley and Sons, Inc., New York, 310 pp., 1971. D. G. Morrison, On the Interpretation of Discriminant Analysis, <i>Journal of Marketing Research, 6</i>, pp. 156-163, May 1969. R. E. Frank, W. F. Massy and D. G. Morrison, Bias in Multiple Discriminant Analysis, <i>Journal of Marketing Research, 2</i>, pp. 250-258, August 1965. An Analysis of Urban Watershed Wastewater Control in Allegheny County, Pennsylvania, Program in Engineering and Public Affairs, Carnegie-Mellon University, Pittsburgh, Pennsylvania, 166 pp., May 9, 1973. Girtys Run: A Study in Urban Watershed Management, Environmental Studies Institute and Program in Engineering and Public Affairs, Carnegie-Mellon University, Pittsburgh, Pennsylvania, 260 pp., May 8, 1974.