I have been getting rain water in my basement when there is heavy rain. I want to install a sump pump. my question is do i have to lay the channels that lead to my pump around the entire basement perimeter. I live in a row home that has only two walls that are not shared with a neighbor. I believe that along these walls that is where the water comes in from the out side. So will i have dig a channel along these walls and have them pitch towards the pump? and any info on installation such as depth of the actual channels and water proofing for them