Browse Forums Landscape & Garden Design 1 Nov 21, 2012 7:17 pm Hello, I will soon be running a long straight length of Reln rain drain through some concrete in my front yard (a total of 11 metres in a straight line). When I say "rain drain" I am talking about the plastic channel with the plastic grate on top to collect surface water. Anyway, back to my problem. Although the 11m length is in a straight line the gradient of the ground varies. The first half (5 metres) drops about 1cm per metre. The second half (6 metres) drops about 4cm per metre. I figure I will put a join where the change in elevation occurs but I don't know how to actually finish that join. The "clip together" nature of the pieces of rain drain assume a constant elevation, so right now I am leaning towards sculpting concrete to provide "continuity" where the plastic leaves gaps. Is this how it should be done or is there a smarter way to go about it? It would be nice if they sold some kind of flexible joint but there doesnt seem to be one available. Yeah mine about 9 metres long and 8 wide with slope of 25% at one point but the end point of the outlet is past the side of garage and if he concretes allowing for… 4 4517 Agreed. I just found out today the certifier has not given the final sign off. 2 4072 Grab a hose, insert it at the top of the inlet/down pipe and turn the water on and see where the water is escaping from. Then you'll know. 3 8454 |