Susan stands where the water will flow AWAY from the house. Digging starts at the South end where we need to let the sun into the lower level, then it swings towards the field on the West.
The radon vent runs inside the footing. Then it dives under the footing and pops up some distance from the house in the grassy swale. Most radon vents shoot up through the roof — but not in a Passive House, where “don’t pierce the shell” is a golden rule.