I suspect that the ducting will fill with water that can not drain away, so the S.W.A. cable will suit in water forever.
It shouldn't be too difficult to arrange the ducting so that it'll drain. At home I've got a few 'access points' (just a couple of inspection chamber risers with a lid on top, with a sheet of geotextile across the bottom to keep the soil out but let water seep away) - it should then be relatively easy to ensure that each length of ducting has a slight fall to an access point. In a couple of places where for aesthetic reasons the access point doesn't want to be visible, the top's just left a few 10s of cm below the surface and covered over.
I suspect that the ducting will fill with water that can not drain away, so the S.W.A. cable will suit in water forever.
It shouldn't be too difficult to arrange the ducting so that it'll drain. At home I've got a few 'access points' (just a couple of inspection chamber risers with a lid on top, with a sheet of geotextile across the bottom to keep the soil out but let water seep away) - it should then be relatively easy to ensure that each length of ducting has a slight fall to an access point. In a couple of places where for aesthetic reasons the access point doesn't want to be visible, the top's just left a few 10s of cm below the surface and covered over.
