00000nam 2200000zi 4500 9.874138 CaOODSP 20241203113649 m o d f cr bn||||||||| 190603s1995 onca ob f000 0 eng d CaOODSP eng rda CaOODSP n-cn-on En13-5/95-196E-PDF Crowe, Allan, 1952- author. A model for managing the impact of pesticide on groundwater at multiple geographical scales : watershed to soil profile / by A.S. Crowe & W.G. Booty. [Ottawa] : Environment Canada, Water Science and Technology Directorate = Environnement Canada, Direction générale des sciences et de la technologie, eau, [1995] 1 online resource (7 unnumbered pages) : illustrations. text txt rdacontent computer c rdamedia online resource cr rdacarrier [NWRI contribution] ; 95-196 Cover title. Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references. "The multi-level pesticide assessment methodology developed here permits regulatory personnel to undertake a variety of assessments on the potential for groundwater contamination from pesticides in agricultural areas at an increasingly detailed geographical scale of investigation. This approach accounts for a variety of assessment objectives, geographical scales, restrictions on the availability and accuracy of data, time available to undertake the assessment, and the expertise of the decision maker. The Level 1: regional scale ranks the relative potential for groundwater contamination among several districts. The Level 2: local scale assesses the potential for groundwater contamination of soils within a district at a soil polygon scale. A Level 3: soil profile scale allows the user to simulate the migration of a pesticide within a specific soil profile, and to determine the extent and timing of leaching of the pesticide. The system developed here integrates, GIS, data bases, data management systems, knowledge-based systems, and pesticide assessment models"--Abstract. gccst Pesticides gccst Groundwater gccst Water pollution Booty, William G., author. Canada. Environment Canada. Canada. Water Science and Technology Directorate. National Water Research Institute (Canada) NWRI contribution ; 95-196. (CaOODSP)9.844121 PDF 1.44 MB https://publications.gc.ca/collections/collection_2019/eccc/en13-5/En13-5-95-196-eng.pdf