The most reliable way to eliminate undesirable, free standing water is to install French drains with slotted pipes, filter fabric and gravel. The old way of .. French Drain problems begin as they slowly become clogged by sediment. A ba.t leak can cause water to seep inside the hollow voids of the masonry creating damp .French drains work by curing a symptom, not the cause. They extract the water collected in the drainage pipes to the outside. There are many variables that affect .LIVE HELP! Consulting. We can answer any question and help save you time and money with your drainage project..