Dane County Stormwater Manual

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inlet_protection [2022/05/11 09:08] – admininlet_protection [2023/11/21 15:29] (current) – admin
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 :!:**This page is for temporary inlet protection during construction. For permanent oil and grease inlet protection, refer to the [[Oil and Grease Control]] page.** :!:**This page is for temporary inlet protection during construction. For permanent oil and grease inlet protection, refer to the [[Oil and Grease Control]] page.**
  
-**Advantages**+<color green>**Advantages**</color>
   *Reduces the amount of sediment leaving the site   *Reduces the amount of sediment leaving the site
   *Easy to construct   *Easy to construct
  
-**Disadvantages**+<color red>**Disadvantages**</color>
   *Requires frequent maintenance to prevent clogging   *Requires frequent maintenance to prevent clogging
   *Ineffective for small particles and during large storm events   *Ineffective for small particles and during large storm events
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   *“Dual fabric” filter bag, with nonwoven bottom and woven top   *“Dual fabric” filter bag, with nonwoven bottom and woven top
  
-[[File:/Images/Framed Inlet Protection.PNG]]+{{ :wiki:images:framed_inlet_protection.png?600 |}}
  
 ====Type A Inlet Protection==== ====Type A Inlet Protection====
 Wisconsin DNR Type A inlet protection is applicable to field inlets surrounded by unpaved surfaces. A frame (typically from 2" x 4" lumber) is constructed and staked to completely surround the inlet, with Type FF fabric attached and trenched into the ground. Wisconsin DNR Type A inlet protection is applicable to field inlets surrounded by unpaved surfaces. A frame (typically from 2" x 4" lumber) is constructed and staked to completely surround the inlet, with Type FF fabric attached and trenched into the ground.
  
-[[File:/Images/Type A.PNG]]+{{ :wiki:images:type_a_inlet_protection.png?600 |}}
  
 ====Block and Gravel Drop Inlet Sediment Filter==== ====Block and Gravel Drop Inlet Sediment Filter====
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 These structures are constructed with concrete blocks, laid lengthwise on their sides with a height of 12-24 inches.  The blocks should be wrapped with a wire mesh, overlain with non-woven, pervious geotextile fabric, to prevent stone from washing through the openings in the block, which should be supported by 2 x 4 inch wood studs placed through the outer holes in the block.  Geotextile fabric should be placed around the perimeter of the structure, extending at least 12 inches from the block.  1-3 inch washed stone should be placed on top of the fabric and against the block.  The stone should be no more than 2 inches from the top of the concrete block with a slope of 2:1 or flatter. These structures are constructed with concrete blocks, laid lengthwise on their sides with a height of 12-24 inches.  The blocks should be wrapped with a wire mesh, overlain with non-woven, pervious geotextile fabric, to prevent stone from washing through the openings in the block, which should be supported by 2 x 4 inch wood studs placed through the outer holes in the block.  Geotextile fabric should be placed around the perimeter of the structure, extending at least 12 inches from the block.  1-3 inch washed stone should be placed on top of the fabric and against the block.  The stone should be no more than 2 inches from the top of the concrete block with a slope of 2:1 or flatter.
  
-[[File:/Images/Block_And_Gravel_Inlet_Protection.PNG|Source: Adapted from Virginia Department of Environmental Quality]]+{{ :block_and_gravel_inlet_protection.png?600 |}}
  
 ====Excavated Drop Inlet Sediment Trap==== ====Excavated Drop Inlet Sediment Trap====
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 The basin should be lined with [[erosion matting]] or vegetation tolerant of frequent inundation to prevent erosion of the basin.  [[Native Plants|Native vegetation]] is encouraged; however, species should be carefully selected to ensure that exotic and invasive species are not planted. The basin should be lined with [[erosion matting]] or vegetation tolerant of frequent inundation to prevent erosion of the basin.  [[Native Plants|Native vegetation]] is encouraged; however, species should be carefully selected to ensure that exotic and invasive species are not planted.
  
-[[File:/Images/Excavated_Drop_Inlet_Protection.PNG|Source: Adapted from Virginia Department of Environmental Quality]]+{{ :wiki:images:excavated_drop_inlet_protection.png?600 |}}
  
 ====Manufactured Devices==== ====Manufactured Devices====
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 ==References== ==References==
-  * [[https://dnr.wisconsin.gov/sites/default/files/topic/Stormwater/1060InletProtection.pdf|DNR Storm Drain Inlet Protection Conservation Practice Standard 1060]]+  * [[https://dnr.wisconsin.gov/sites/default/files/topic/Stormwater/1060InletProtection.pdf|Wisconsin DNR Storm Drain Inlet Protection Technical Standard 1060]]
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