Thanks, that is what I thought, so when the groundwater elevation in the field rose to the level of the trench invert there was effectively no gradient other than from the stage elevation within the trench. In this case with the trench completely full and with wetted surface exfiltration, a 4'...
I am designed a shallow exfiltration trench with invert at 4' bgs (below ground surface) with embedded storage chambers due to no allowed off-site discharge and a very small area available. I am having a little difficulty with the entry for Groundwater Elevation and the effects of varying this...
