Report by TRCA which studied the performance of three different RWH cistern systems in the GTHA. All three being designed to collect roof water, store it and then distribute that for greywater reuse. Results showed during a normal rainfall year that systems could supply ~59 - 80% of non-potable water needs and diverted 18% - 42% roof runoff from storm sewers. | Report by TRCA which studied the performance of three different RWH cistern systems in the GTHA. All three being designed to collect roof water, store it and then distribute that for greywater reuse. Results showed during a normal rainfall year that systems could supply ~59 - 80% of non-potable water needs and diverted 18% - 42% roof runoff from storm sewers. |