Trapezoidal

The Trapeziodal shaped detention pond is the most common open detention pond. The pond features a bottom area and side slopes on four sides. Typically the side slopes can vary

Where

• 
• 
• = Average length (ft or m)
• = Average width (ft or m)
• = side slope on length side xh:1v
• = side slope on width side, xh:1v