Across the U.S. and Canada design flows for residential households vary significantly. What’s interesting is that even though we see flows as low as 90 to upwards of 200 gpd per bedroom, total indoor water usage does not generally vary significantly, so why do we see such a range? The varying regulatory approaches primarily relate to how much safety factor is included in the design flow.
To better understand these flows there are many items to consider. One of the most crucial factors is that design flows should be viewed as peak flows in onsite wastewater treatment systems. Maximum and minimum
