Which dispersal bed type can be installed in slopes up to 25%?

Which dispersal bed type can be installed in slopes up to 25%?

• A. Type A
• B. Type B
• C. Type C
• D. Type D

Answer: (A)

Dispersal bed design must align with how the ground sits. On slopes, you need a bed that stays stable and can distribute effluent evenly without shifting or allowing runoff to bypass part of the bed. Type A is designed to handle steeper ground, up to 25% slope, so it maintains a stable structure and keeps the infiltrative surface properly loaded across the bed even as the ground tilts. That stability and uniform distribution on a slope is what makes it the appropriate choice for up to 25% grade. The other bed types are intended for gentler, flatter sites, where their construction isn’t built to resist movement or ensure even loading on steeper slopes, which could lead to uneven performance or failure.

Dispersal bed design must align with how the ground sits. On slopes, you need a bed that stays stable and can distribute effluent evenly without shifting or allowing runoff to bypass part of the bed. Type A is designed to handle steeper ground, up to 25% slope, so it maintains a stable structure and keeps the infiltrative surface properly loaded across the bed even as the ground tilts. That stability and uniform distribution on a slope is what makes it the appropriate choice for up to 25% grade. The other bed types are intended for gentler, flatter sites, where their construction isn’t built to resist movement or ensure even loading on steeper slopes, which could lead to uneven performance or failure.