I'm slowly getting educated as I get various quotes re: a leaky basement. I understand that the ideal way to remove the puddles is to keep the water from entering in the first place. Financially, however, I may have to go with a sump pump instead. A few contractors have quoted the sump pump along with digging an interior trench along a few of the walls where the leaking occurs. One contractor says you don't need these trenches - saying that by merely digging the hole in the floor, the water will gravitate to the hole/sump pump. Well, are the trenches needed, recommended or not? Thanks