AWWA QTC97114

Water supply wells are typically located near rivers or streams to take advantage of surface water as a source of recharge. However, wellfield pumping can lower the water table below the river stage causing water to flow into the aquifer under a hydraulic gradient, which is a phenomenon known as induced infiltration. With induced infiltration comes the potential for transport of pathogenic protozoa into the aquifer, a concept known as groundwater under the direct influence of surface water (GWUDISW). The Cincinnati Water Works utilizes the Great Miami River Buried Valley Aquifer as a source of groundwater. In 1994, the Ohio Environmental Protection Agency designated the Bolton wellfield as a true groundwater (i.e. not GWUDISW). The purpose of this project was to confirm this designation by evaluating the impact of induced infiltration upon the transport of pathogenic protozoa and other microscopic particulates. Specifically, the project was completed to: review the hydrologic factors that influence the process of induced infiltration; evaluate the transport of microorganisms during induced infiltration events; and, develop a routine monitoring plan to verify continued safe water under variable conditions of induced infiltration.

Product Details

Published:

01/01/1997

ISBN(s):

0898679583

Number of Pages:

18

File Size:

1 file , 170 KB