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Chapter 4-Site-Spec Pfustdal Storm Water BMPs • <br />Ideally, dikes are installed before industrial activity begins. However, dikes can be easily - <br />constructed at any time. Temporary dikes (usually made of dirt) generally only last for 18 months • <br />or less, but they can be made into permanent structures by stabilizing them with vegetation. <br />Vegetation is crucial for preventing the erosion of the dike. <br />Dikes should be inspected regularly for damage. This is especially important after storm events <br />since a heavy rain may wash parts of a temporary dike away. Any necessary repairs should be <br />made immediately to make sure the structure continues to do its job. <br />Advantages of Diversion Dikes <br />• Effectively limit storm water flows over industrial site areas <br />• Can be installed at any time <br />• Are economical temporary structures, when built from soil onsite <br />• Can be converted from temporary to permanent at any time <br />Disadvantages of Diversion Dikes <br />• Are not suitable for large drainage areas unless there is a gentle slope <br />• May require maintenance after heavy rains <br />• <br />4-8