Why drainage is more complicated in Allen than most contractors admit
We have been doing drainage work in Allen and Collin County for eighteen years, and the consistent lesson is this: most synthetic turf failures are drainage failures. The turf product itself is fine. The base design or drainage outlet is not. We handle drainage both as part of new installations and as retrofits for existing turf systems that were installed without adequate drainage planning.
Allen sits on Blackland Prairie clay — one of the worst-draining soil types in the country for residential landscaping. Water applied to that clay at any rate above about 0.1 inches per hour simply stays on the surface. That is why Allen yards pond after rain, and it is why a synthetic turf installation on that clay without an engineered base is just creating a synthetic-looking pond.
The crushed granite base we use in every installation drains at roughly 30 inches per hour — 300 times faster than the native soil. But that fast-draining base has to have somewhere to send the water. An exit point. If the base drains fast and the exit point is insufficient — too small, blocked, or simply absent — the base fills up from the bottom and you have the same water retention problem, just a few inches lower in the ground.