Hydraulic Loading

The hydraulic loading is one of the factors which will influence the performance of filters.  It is defined as the amount of wastewater applied per day over the surface area of the media.  So its units are gallons/day/square foot.  

The following formula can be used to calculate the hydraulic loading of a filter, including recirculation:



Given a total flow of 3 mgd and a filter area of 7,850 ft2, the hydraulic loading would be:


So the hydraulic loading is 382 gpd/ft2.