Ground Water Pollution Potential Of Portage County Ohio

Author : Joel David Vormelker
Publisher :
ISBN 13 :
Total Pages : 133 pages
Book Rating : 4.:/5 (115 download)

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Download or read book Ground Water Pollution Potential of Clark County, Ohio written by Joel David Vormelker and published by . This book was released on 1995 with total page 133 pages. Available in PDF, EPUB and Kindle. Book excerpt: A ground water pollution potential map of Clark County has been prepared using the DRASTIC mapping process. The DRASTIC system consists of two major elements: the designation of mappable units, termed hydrogeologic settings, and the superposition of a relative rating system for pollution potential. Hydrogeologic settings form the basis of the system and incorporate the major hydrogeologic factors that affect and control ground water movement and occurrence including depth to water, net recharge, aquifer media, soil media, topography, impact of the vadose zone media, and hydraulic conductivity of the aquifer. These factors, which form the acronym DRASTIC, are incorporated into a relative ranking scheme that uses a combination of weights and ratings to produce a numerical value called the ground water pollution potential index. Hydrogeologic settings are combined with the pollution potential indexes to create units that can be graphically displayed on a map. Clark County lies within the Glaciated Central Hydrogeologic Region. The county is covered by variable thicknesses of glacial till, lacustrine deposits, kames outwash, and alluvial deposits. These unconsolidated deposits are underlain by limestone, shale, and shaley limestone bedrock. Ground water yields are dependent on the type of aquifer and vary greatly throughout the county. Pollution potential indexes are relatively low to moderate in areas of till or lacustrine cover over bedrock. Buried valleys containing sand and gravel aquifers, and areas covered by outwash have moderate to high vulnerabilities to contamination. Ground water pollution potential analysis in Clark County resulted in a map with symbols and colors which illustrate areas of varying ground water contamination vulnerability. Nine hydrogeologic settings were identified in Clark County with computed ground water pollution potential indexes ranging from 72 to 205. The ground water pollution potential mapping program optimizes the use of existing data to rank areas with respect to relative vulnerability to contamination. The ground water pollution potential map of Clark County has been prepared to assist planners, managers, and local officials in evaluating the potential for contamination from various sources of pollution. This information can be used to help direct resources and land use activities to appropriate areas, or to assist in protection, monitoring, and clean-up efforts.