The benefits are not site specific. Run-off from your property combines with that from other lots, accumulating to become part of the problem downstream. Benefits are gained throughout the City by minimizing the flooding of roads, intersections, and downstream properties.
Pour several gallons of water in all basement floor drains, run water in any unused sinks and shower stalls, and flush any unused toilets. These fixtures should have built in traps (“U” shaped pipes), designed to hold water and act as a barrier to prevent sewer gases from entering the home.