I have a patio on which I plan to build a conservatory. However, at the rear of the patio is a retaining wall approx. 3ft high which has weep holes along the bottom for drainage of the raised lawn area. At present the water drains onto the patio so we end up with inches of standing water at the worst times of year (we have clay soil too which hardly helps). Is there a way I can divert the water from the weep holes away from the patio (i.e. away from the conservatory once it is built)? One of the guys who quoted us for the conservatory mentioned that something could be installed to the bottom of the wall to carry the water away, but I cant recall what it was!