#3 Minimum Pond Geometry

• Ponds should be wedge-shaped, narrowest at the inlet, and widest at the outlet

• Minimum length to width ratio should be 1.5:1 (i.e., length equal to 1.5 x width). Greater flowpaths are recommended

• Maximum depth of the permanent pool should not exceed eight feet (average of 4 to 6 feet)

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The geometry of ponds and wetlands can also have a significant impact on the pollutant removal performance. The next two slides are representative of the recommendations presented in this slide.