What minimum slope is recommended across turf areas to provide positive drainage?

What minimum slope is recommended across turf areas to provide positive drainage?

• A. 2% To 3%
• B. 0% To 1%
• C. 4% To 5%
• D. 5% To 6%

Answer: (A)

Water on turf needs a path to move away after rainfall. A gentle but definite slope ensures surface water drains toward an outlet, preventing puddling that can suffocate roots, invite disease, and compromise turf health. Choosing a minimum slope at the lower end of the drainage-adequate range gives you a balance: enough grade to keep the surface dry and usable after rain, but not so steep that it causes erosion, edge damage, or mowing and maintenance challenges. If there’s little to no slope, water remains on the surface and turf becomes wet and stressed; if there’s too much slope, water runs off too quickly and the soil can erode. So, the correct choice identifies that a small, effective slope is needed to provide positive drainage across turf areas.

Water on turf needs a path to move away after rainfall. A gentle but definite slope ensures surface water drains toward an outlet, preventing puddling that can suffocate roots, invite disease, and compromise turf health.

Choosing a minimum slope at the lower end of the drainage-adequate range gives you a balance: enough grade to keep the surface dry and usable after rain, but not so steep that it causes erosion, edge damage, or mowing and maintenance challenges. If there’s little to no slope, water remains on the surface and turf becomes wet and stressed; if there’s too much slope, water runs off too quickly and the soil can erode.

So, the correct choice identifies that a small, effective slope is needed to provide positive drainage across turf areas.