My home is in a neighborhood where the homes are all somewhat staggered down the block. In other words, the property of one home sort of slopes down to the property line of the next, and so on. On the one side of my home where my neighbor’s home slopes down to mine, I have had some water accumulation near my foundation walls. It has not been terrible (ie standing water) but the soil does get wet after heavy rain or snow (I am in Colorado). Another part of the problem is that his downspouts discharge down his side of the house towards the property line.
I had a contractor come in to regrade my side of the house so I now have a little slope of my own as a barrier to my foundation. As part of the job, a swail was made down the entire property line out towards the street. The contractor initially just wanted to fill it with gravel, but the foreman on the job suggested a perforated, rigid pipe, which sounded good to me. He also suggested tying in three downspout lines to the perforated pipe to carry my roof water from these downspouts. One downspout has minimal water load, the other farthest down the line towards the beginning of the pipe has a moderate load, and the third downspout is very near the end of the line and carries moderate to heavy water load. After the trench was covered up and things put back in place, it occurred to me that the smart thing to do would have been to put in a second SOLID pipe dedicated for the downspout water. I was reading some Ask the Builder articles by Tim Carter and he says to NEVER discharge roof water into a french drain/perforated pipe system. However, it is not clear in his articles whether that only applies to situation where the french drain is actually around the perimeter of the house next to the foundation wall. In my case, the trench is probably 15 feet away from my foundation wall and purely along the property line (parallel but not next to the foundation wall). In retrospect, I wish I had thought of requesting a dedicated solid line for the downspout water, but perhaps things will be OK? I have been so actively involved in the project, I fear the contractor will hit me with a shovel if I ask them to dig up the trench again – and I don’t think they would do it without more money. I must say that the contractor was not fond of tying in the downspout lines in the first place – he wanted to make mini-swales over to the trench and let the downspout water surface discharge and flow towards the trench. However, I have been so sick and tired of tripping over downspout extenders that when the foreman offered to tie in the downspouts to the perforated pipe, I said OK, and when we both asked the contractor, he said OK, as long as I was religious about keeping the gutters clean so as to avoid debris getting into the pipe.
Should I ask them dig up the trench, cap off the Y adapters from the downspouts into the perf. pipe, and put in a second dedicated line for the downspouts? At this point, if I have to pay a little extra to get this done right, I really don’t care.
TIA for any input.