Low Impact Development Manual for Michigan - OSEH - University ...

3. Inspect the filter strip and the bypass swale and
make repairs as needed. Look for:
° Damaged turf reinforcement or riprap rolling
downhill,
° Erosion within the buffer or swale, and
° Gullies or sediment flows from concentrated
flows downhill of level spreader,
Once a year:
• Remove any weeds or shrubs growing on level
spreader or in swale.
Cost
Level spreaders are relatively inexpensive and easy
to construct. There are various types of level spreaders,
so costs will vary. Per foot material and equipment
cost will range from $5 to $20 depending on the type
of level spreader desired. Concrete level spreaders may
cost significantly more than perforated pipes or berms,
but they provide a more sure level surface, are easier to
maintain, and more reliable.
LID Manual for Michigan – Chapter 7 Page 226