[steveone]

A good family friend of mine who is a contractor recently gave me some advice regarding drainage for a retaining wall that I am building. He said when laying down the drainage pipe along the back of the wall, a pipe with a 0% grade- no high spots, connected at one end to an existing drain pipe leading to the street would do the job. He also advised me to use the perf. solid drain pipe instead of the perf. corrugated pipe. And another thing that didnt make too much sense to me either- he also informed me that when using the perf. solid drain pipe I must lay the pipe so that the holes are at the bottom. I questioned this due to the obvious- how is the water suppose to be redirected with a pipe that has holes on the bottom of the channel. An how would water enter the pipe if the holes are at the bottom?? Can someone please explain this to me? And can someone please explain the 0% grade on teh drain pipe? This is the first time Ive taken on a project like this and I hope someone would be kind enough to point me in the right direction. Thanks.