What would happen to the level of Twin Lakes without the discharge from the Roberts WWTP?

When it rises above 966 ft, Twin Lakes floods roadways and damages homes.  Twin Lakes was at an elevation of 969 ft in August of 2017.  A reasonable level for Twin Lakes is 960 ft, the approximate elevation in 1990.  Without the wastewater, Twin Lakes would decline about 2 inches/yr, based on the 43-year history from 1974 to 2016.  At this rate, it would take about 65 years for Twin Lakes to reach 960 ft without the discharge from the Roberts WWTP.