AWWA ACE70933

This paper discusses a spreadsheet tool that was developed and utilized to conduct a general desktop mixing evaluation of storage tanks. Physical and operational characteristics of distribution system storage tanks were used as inputs to the spreadsheet to evaluate the mixing conditions. For this analysis, the required physical characteristics of the tanks was obtained from as-built design drawings and the operational characteristics were obtained from supervisory control and data acquisition (SCADA) data. The results from the general evaluation performed with the spreadsheet tool were used to help select the tanks that would undergo additional computational fluid dynamics (CFD) modeling and water quality measurements (temperature profiles). These additional more detailed evaluations were then used to verify the results of the spreadsheet mixing evaluation tool. The general and detailed mixing evaluations can be used as the basis for recommendation improvements or operation changes to improve mixing and water quality within storage tanks. Includes 3 references, tables, figures.