The answer to 'why is my drainage system dead trees' is that a malfunctioning drainage system can lead to poor soil conditions that can kill nearby trees. Clogged or damaged drainage pipes can cause waterlogging, which deprives tree roots of oxygen and leads to root rot and tree death.
Common signs of drainage issues include standing water, soggy soil, and trees with wilting, discolored leaves or dying branches. To fix the problem, you may need to clear debris from drains, repair broken pipes, or install additional drainage features like French drains or dry wells.