ourmanflint
Member
Hi
You'll need to add an anti-siphon hole to your outflow drain to stop it from draining too much. Just a small hole a few mm below the water level on the outflow pipe will do it. Then if pumps ever stop the water will stop draining when it gets to the air hole and breaks the siphon. You should be able to estimate how much space you will need to leave in sump to cover what does drain before anti siphon kicks in.
You'll need to add an anti-siphon hole to your outflow drain to stop it from draining too much. Just a small hole a few mm below the water level on the outflow pipe will do it. Then if pumps ever stop the water will stop draining when it gets to the air hole and breaks the siphon. You should be able to estimate how much space you will need to leave in sump to cover what does drain before anti siphon kicks in.