Diffuse or nonpoint pollution has become a major focus of pollution abatement efforts throughout the world: problems such as siltation, eutrophication or contamination with toxic compounds are widespread and seem set to intensify for the 21st century. The attack on these problems must differ from the strategies used against point sources of pollutants. In most cases nonpoint pollution loads are transient and highly variable hydrological phenomena related to the use and misuse of land; they may also result from atmospheric deposition of local or distant origin. Prevention of such pollution is far more economic than attempting to "clean up" the environment after diffuse pollutants have entered the ecological system. The 81 papers included in this book describe work going on in 20 countries around the world. and deal with: economic and institutional issues: watersheds and coastal issues, urban and highway runoff; groundwater and soil water; agriculture/silviculture; and mathematical modelling. It is hoped that bringing together intemational expertise on these topics will highlight a growing consensus on the technical strategies available and on the policy measures needed to successfully combat diffuse pollution.

Table of Contents:
Economic and Institutional Issues: Addressing nonpoint sources of Aster pollution must become an International priority, A.M. Duda; Market and bargaining approaches to nonpoint source pollution abatement problems, N.R. Netusil, J.B. Braden. Watersheds and Coastal Issues: Diffuse pollution in the Lagoon of Venice, G. Bendoricchio et al; Broiler litter application to land in an agricultural watershed: a GIS approach, F. Xu et al; The monthly impact of nonpoint sources to Hoedong Lake, Korea, Y. -K. Choi, J.K. Koo). Separation of point and diffuse loads of pollutants using monitoring data of rivers, H. Behrendt. Urban and Highway Runoff: Use of resource-efficient plants to reduce nitrogen, phosphorus and pesticide runoff in residential and commercial landscapes, B. Hipp et al; Deposition of trace metals in urban and rural areas in the Lake Michigan basin, N. Pirrone, G.J. Keeler; Biomonitoring and amelioration of nonpoint source pollution in some aquatic bodies, P. Chandra et al. Groundwater and Soil Water. Groundwater monitoring network design using minimum well density, G.L. Grabow et al; Pesticide contamination of groundwater in Virginia: BMP impact assessment, S. Mostaghimi et al: Sustainable agriculture: impacts on nonpoint pollution, J.L. Hatfield; Long-term (15 years) results of NPSS controls in an agricultural watershed upon a receiving lake's water quality, P.J. Garrison, T.R. Asplund; Pollution control and prevention at containerized nursery operations, S.V. Alexander; Runoff characteristics and observation methods of pesticides and nutrients in rural rivers, S. Ebise et al. Mathematical Models: Movement of nitrogen through an agricultural riparian zone: 1. Field studies, J.C. Clausen et al; Aspects of a computational model for salinity variations in a well-mixed tidal reach, G.S. Reddy, S.N. Ghosh; A simplified computer model for nonpoint source pollution in a small urban area, J.-T Kuo et al.