Volume 2-05, Chapter 3 - City of Wichita

Section 3.2.1 - Stomwater Pond
Figure 3-11 Permanent Pool Length to Width
Ratio
• Minimum depth
for the pond bottom shall be 3 to
4 feet, though a minimum depth of 10
feet is recommended for ponds where fish habitat is desired. Deeper areas near the outlet
will yield cooler bottom water discharges that may
mitigate potential downstream thermal
effects.
• Side slopes to the pond may not exceed 5:1 (h:v) unless a safety bench is
provided, and in
no case shall exceed 3:1 (see Figure 3-12). Alll side slopes should be
verified with a
geotechnical evaluation to ensure slope stability.
• Safety benches
shall have a maximumm slope of 10:1, and a minimum width of 10’.
• The
perimeter of all deep pool areas (3
feet or greater in depth) shall be surrounded by an
aquatic bench. The aquatic bench shall extend inward from the normal pool edge 10-15
feet on average and have
a maximumm depth of 18 inches below the normal pool water
surface elevation (see Figure 3-12).
• The
pond edgee shall have
turf reinforcing mesh or riprap covering the area from 2 feet
above the normal pool to 2 feet below the normal pool to protect areas of the pond that will
be exposed to
wave action. Appendix D provides wind roses for Wichita during each
month of the year to aid in
locating areas that will require reinforcement.
Local winds are
most pronounced coming from the north and south
directions.
• The
contours and shape of the permanent pool should be irregular to provide a natural
landscape effect.
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Volume 2, Technical Guidance