AWWA ACE63008

This slide presentation outlines a study to: investigate how storage tanks impact water quality; evaluate and assess all 50 distribution tanks; design modifications for reservoirs and elevated tanks; and, study mixing options for standpipes. The general approach involved: reservoirs, tanks with Aspect Ratios (H/D) ¿¿¿¿¿¿¿ 1; use the split design as in the Higdon tests; standpipes, tanks with Aspect Ratios (H/D) ¿¿¿¿¿¿¿ 1; three nozzles located along a vertical plane will be sufficient; locate the lowest nozzle at ¿¿¿¿ the elevation of the average HWL; locate the top nozzle just below the average LWL; increase the nozzle diameter with the increase in elevation; decrease the effective diameter with respect to the maximum allowable head loss; use Duckbill Checkvalves; allows for reduction in effective diameter; and, provides flexibility to meet target velocities at lower than expected flowrates. Includes table, figures.