Estimate net water conservation from a wastewater reuse project. Enter treated effluent production, the fraction recovered for reuse, operating schedule, and any freshwater consumed by the reuse process. The calculator reports gross reuse, net freshwater savings, annualized savings, and reuse efficiency for conservation planning.
Net savings counts only recovered water that can displace actual freshwater demand, then subtracts freshwater consumed by the reuse process. Excess recovered water beyond demand is not counted as conservation.
This is a water-balance estimate. Verify water quality, seasonal demand, storage, permitting, and whether process-water consumption is already included in site demand.
From 100,000 gal/day of effluent at 70% capture, gross reuse is 70,000 gal/day. With 90,000 gal/day of offsettable demand and 5,000 gal/day of process water, net savings are 65,000 gal/day. Over 300 days, that is 19.5 million gallons.
Recovered water cannot displace more freshwater than the compatible demand available at that time.
Subtract freshwater used for backwash, cleaning, chemical preparation, or dilution that is caused by the reuse system.
Yes, if the reuse system and compatible demand operate every day; otherwise enter the expected annual operating days.
Net freshwater savings are shown as zero rather than a negative conservation value.
No. Use matched average daily values or evaluate seasonal supply, demand, and storage separately.
| Water balance item | Treatment | Conservation effect |
|---|---|---|
| Captured effluent | Flow × capture rate | Gross reuse |
| Compatible demand | Caps useful reuse | Avoids overstatement |
| Process freshwater | Subtracted | Reduces savings |
| Operating days | Annual multiplier | Annual savings |