Sheet Subject Index Page PDF file of this fact sheet Ground Water Resources Mapping in Ohio Click here for a map of available counties . E arly in the 1970's, the Division of Water real ized the need to distribute basic ground water availability information to the general public in an easy to use, semi-technical format. To meet this need, the Division began producing a series of maps which describe Ohio's ground water resources on a county by county basis.
All maps use a consistent color coding system to represent well yields.
For example, properly constructed wells drilled in areas colored blue on any map can be expected to yield 100 to 500 gallons per minute. Areas colored yellow would yield 25 to 100 gallons per minute . In addition to yield information, Ground Water Resources Maps show several other types of data which can be used to aid in the development of a water supply. All maps show selected well log data for locations throughout the county. These data include total well depth, well yield, aquifer type, and depth to bedrock if encountered.