Product(s):	WaterSight
Version(s):	10.00.
Area:	Documentation

 

The user can compare average turnover time and mix performance ratio between different tanks for the time range selected. To calculate the mix performance ratio the user need to define the "Desired Turnover Days", configured at the administration page, in the Tanks configuration page. Big values of tank turnover or mix performance ratio can be lead to water quality problems, while very small values can indicate limited storage capacity.

Time Range

The user can select the period for which the turnover and mix performance ratio variables are calculated: last day, last 7 days, last month, last 2 months, last 3 months, last 6 months, last year.

Tanks

Selection of the tanks for comparison

Calculations

Tank turnover time is calculated using level sensor data, with the level converted to volume based on the defined tank geometry.

The weighted average tank volume is the average volume across the analysis time period, with values weighted by the duration between sensor readings to accommodate irregular data intervals.

The average flow rate into the tank is calculated as the sum of all increases in volume (ignoring decreases in volume) during the analysis period divided by the analysis duration. For example, if a typical tank cycle consists of a 1 million gallon increase followed by a 1 million gallon decrease in a 48 hour period, the average flow rate into the tank would be 1 MG / 2 days = 0.5 MGD.

This methodology is comparable to the USEPA tank turnover definition, except structured for automated calculation from sensor readings rather than a manual spreadsheet.

 

 

For more information about WaterSight, please go to OpenFlows WaterSight TechNotes and FAQ's.