Final answer:
The thickness of asphalt concrete for channel lining varies, generally ranging from 2 to 4 inches, and can go up to 6 inches or more for heavy-duty applications. The decision should be informed by design specifications, engineering judgment, and standards such as those provided by AASHTO.
Step-by-step explanation:
The thickness of asphalt concrete used for lining channels can vary based on several factors such as the expected load, the climate, and the underlying soil conditions. In general, a typical thickness for a lining application may range from about 2 to 4 inches (50 to 100 mm). However, for heavy-duty applications, or where erosion protection is critical, the thickness can go up to 6 inches (150 mm) or more. It is essential to consider the hydraulic conductivity of the soil beneath the lining, the velocity of water through the channel, and the durability required for the anticipated conditions.
Design specifications typically come from engineering manuals or local guidelines that take into account regional conditions and intended use. Engineering judgment and design standards should guide the final decision on the necessary thickness. Consulting with a civil engineer or referencing the American Association of State Highway and Transportation Officials (AASHTO) Design Guide or other engineering standards can provide more precise recommendations suitable for your specific project.