In the absence of specific instructions from the purchaser, what is the recommended slope for the finished tank grade?

• A. 1 inch in 5 feet
• B. 1 inch in 10 feet
• C. 1 inch in 15 feet
• D. 1 inch in 20 feet

Answer: (B)

The recommended slope for the finished tank grade being 1 inch in 10 feet is based on ensuring proper drainage and minimizing the potential for water accumulation around the tank foundation. A slope of this magnitude allows rainwater and other liquids to run off effectively, reducing the risk of soil erosion and structural issues that could arise from standing water. It is a balanced approach that provides sufficient drainage without being overly steep, which could complicate maintenance and tank access.

While other slopes may offer benefits, they either do not provide optimal drainage (such as a steeper slope leading to potential washout) or are too gentle to effectively manage runoff. In the context of tank storage, maintaining a controlled environment around the tank is crucial, and a 1 inch in 10 feet slope achieves that balance effectively.