"DAST-9"--Front cover. Federal Water Pollution Control Administration Grant 29-IDA-2. "June, 1969". "Clean water"--Front cover.

The purpose of this study was to determine if the lowering of the high water table by pumping in a given area of the City of Meridian would eliminate infiltration of ground water to the municipal sewers. If the infiltration could be eliminated, the large volume of sewage flow that occurs during the irrigation season would be greatly reduced. Sewage flows in excess of the capacity of the sewage treatment plant are now bypassed to a small stream. It was contemplated that the test results from this study could be used to predict the lowering of water table in other areas of the City of Meridian. The topography, geology, precipitation, as well as local irrigation programs are so irregular in character that no definite criteria could be set up to predict what would occur in other areas. It is concluded that each area would have to be studied independently to decide the depth of well, pump capacity and local affecting conditions. It is also concluded that the cost of capital investment, cost of operation of these pumping projects in the entire Meridian area to lower the water table would be too expensive to accomplish the purpose of lowering the water table below the sewers so as to materially decrease the flow of infiltration water to the sewage treatment plant. It would be less expensive to build a holding lagoons or a separate lagoon system to treat the excess flow to the sewage treatment plant during the irrigation period. This report was submitted in fulfillment of grant 29-IDA-2 between the Federal Water Pollution Control Administration and the City of Meridian, Idaho.