We are laying some new paving and at the same time repairing some damaged clay pipes. The rainwater system is separate to the waste water system.
Do the rainwater drains require any form of traps? Or can the can downpipes from the guttering connect straight into an elbow (with a bit of straight pipe and a reducer inbetween)?
If a trap is required for rainwater drainage, what's the most efficient trap to install (the existing pipes are very close to the surface so can't have a trap with an outlet too low)?
Do the rainwater drains require any form of traps? Or can the can downpipes from the guttering connect straight into an elbow (with a bit of straight pipe and a reducer inbetween)?
If a trap is required for rainwater drainage, what's the most efficient trap to install (the existing pipes are very close to the surface so can't have a trap with an outlet too low)?