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The images above show sediment forebays located in Kenosha County. Images provided by WDNR/RPW.
What: Naturalized forebays for improved sediment capture
Where: At each inlet to the stormwater pond to capture sediment prior to entering the main pool
Why:
- Makes removal of sediment easier as equipment is smaller and readily available (a municipal-owned backhoe may suffice)
- Reduces maintenance costs by more than $40,000 over 20 year period (calculations provided by engineering partners-specific site conditions may impact this cost)
- Decreases the likelihood of algae blooms as nutrient pollution (phosphorus) adheres to the trapped sediment in the forebays
- Improves water quality in the pond and throughout the watershed
Note: Sediment forebays require more frequent dredging, however, the cost is reduced as a smaller sediment volume is being managed. Dredging should occur when forebay depth has been reduced by 50%. This will vary based on surrounding watershed conditions.
Conclusion: Where appropriate, encourage developers to include a forebay(s) in all new stormwater ponds
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