Is a 1% slope typically used for drainage on paved surfaces like parking lots?

A 1% slope is indeed typically recommended for drainage on paved surfaces such as parking lots. This slight gradient allows for efficient water runoff, helping to prevent water accumulation that can lead to pooling or flooding. By maintaining a slope of 1%, water flows towards designated drainage points, such as drains or catch basins, which helps keep the paved area dry and reduces the risk of damage to the surface over time.

This standard is based on engineering principles that promote adequate drainage while ensuring safety and usability of the surface. A slope of 1% (or 1/8 inch per foot) is sufficient to ensure that water does not linger on the surface, which could otherwise compromise the structural integrity and longevity of the pavement.

Other options do not align with established practices for drainage. A slope is necessary regardless of climate conditions; thus, suggesting it's only relevant in rainy climates does not reflect the universal need for proper drainage in all settings. Additionally, the assertion that this slope is only for new constructions overlooks the fact that existing surfaces require proper drainage solutions that often call for the same percentage slope for efficiency and functionality.