| 摘要 |
An athletic field in which a subgrade is initially formed with a series of ditches having a series of drain tiles therein exteriorly covered with pea gravel. A layer of pea gravel is mounted over the subgrade including the ditches having drain tile covered with pea gravel. A layer of crushed stone is mounted over the layer of pea gravel. A layer of sand having an infiltration rate of at least 9'' per hour is mounted over the layer of crushed stone. A layer of soil mixture having an infiltration rate of between 5'' to 9'' per hour is mounted over the layer of sand. The layer of soil mixture has a layer of soil reinforcement matting spaced from the upper surface thereof within a two-inch upper strata of the soil mixture layer. The upper surface of the layer of soil mixture has thereon either grass sod, grass sprigs, or grass seed for establishing a grass growth thereon.
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