Flat ground leaves stormwater with little natural way out.
Westworth Village’s generally level ground gives rainwater limited fall to move away on its own. During a hard rain, water can remain beside foundations, along fence lines, and over buried utility trenches when the yard does not provide a clear downhill route.
A drainage line only works when collected water has somewhere dependable to go. We start with the low spots and the actual direction water can travel by gravity, then consider the collection points, pipe slope, discharge location, and finished grade as parts of one system. Putting a drain in a low area without a route beyond it leaves the underlying problem in place.
Repeated ponding also keeps the same soil wet through one storm after another. Moving that water away helps limit the repeated moisture changes beside a slab and avoids leaving soft ground around buried lines, where wet conditions can hide or make a line issue harder to deal with.