Which statement accurately describes the mound distribution cell dimensions?

Which statement accurately describes the mound distribution cell dimensions?

• A. The distribution cell must be square in shape.
• B. The distribution cell width must be greater than its length.
• C. The distribution cell must be longer than it is wide and its maximum width is 10 feet.
• D. The distribution cell must be circular with a diameter of 12 feet.

Answer: (C)

Distribution cells in mound systems are designed to spread effluent evenly across the seepage area and allow proper soil absorption. The geometry that achieves this is a long, narrow shape, longer than it is wide. This lengthwise form creates multiple flow paths along the cell, reducing the risk of uneven loading or short-circuiting and promoting uniform percolation through the soil. The width is limited to keep the flow within the portion of the mound that has suitable soil characteristics and to maintain effective infiltration, with a maximum around 10 feet. So, describing the cell as longer than it is wide and not wider than about 10 feet aligns with standard mound design. A square shape, a width greater than the length, or a circular shape with a diameter exceeding the width limit would not meet these practical distribution and infiltration goals.

Distribution cells in mound systems are designed to spread effluent evenly across the seepage area and allow proper soil absorption. The geometry that achieves this is a long, narrow shape, longer than it is wide. This lengthwise form creates multiple flow paths along the cell, reducing the risk of uneven loading or short-circuiting and promoting uniform percolation through the soil. The width is limited to keep the flow within the portion of the mound that has suitable soil characteristics and to maintain effective infiltration, with a maximum around 10 feet. So, describing the cell as longer than it is wide and not wider than about 10 feet aligns with standard mound design. A square shape, a width greater than the length, or a circular shape with a diameter exceeding the width limit would not meet these practical distribution and infiltration goals.