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Increases in production rates in the 100 Areas have caused a demand for additional amounts of cooling water for process use. Consequently, continual efforts have been made to push the existing filter plants well beyond designed capacity. The latest and most successful effort was made at the 100-B filter plant during the spring of 1951. Tests of the 100-B Area indicate that the 100 Area filters can be operated safety at 3,400 GPM per unit, or 13.3% beyond the designed capacity, during the period of most difficult water treatment (February-June). By extrapolation of the data to the most favorable water treatment periods (August--January), it is indicated that net water available for production use is approximately 5% above 3400 GPM. It is recommended that no additional filter plant capacity be installed in existing areas until anticipated water loads exceed 3,400 GPM per filter basin unit. It is further recommended that an investigation be made of the feasibility of changing water flows to the piles on a seasonal basis to take advantage of the fact that the season requiring the greatest theoretical quantity of water (because of high raw water temperatures) is also the season during which it is easiest to produce …