Who Is Impervious Layer?
Impervious Layer Means a Soil Layer with a Percolation Rate Slower Than 60 Minutes per Inch Any Layer of Material in the Soil Profile Which Has a Percolation...
Impervious layer means a soil layer with a percolation rate slower than 60 minutes per inch any layer of material in the soil profile which has a percolation rate slower than 120 minutes per inch.
What does impervious mean in construction?
Impervious surfaces means a constructed surface such as sidewalks, roads, parking lots or driveways covered by water impenetrable materials such as asphalt, concrete, brick, pavers, stone and/or highly compacted soils.
What are examples of impervious surfaces?
...
Examples include:
- roofs.
- solid decks.
- patios.
- sidewalks.
- driveways.
- parking areas.
- roads.
- compacted gravel.
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