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1 0 <br />Chapter 4-Site-Specific IndustriStorm water BMPs <br />When and Where to Use It <br />installed at ales neat the p peooutlet,andailn,the or channel section receiving channel. <br />Outlet where the protection velocity of should flow be may cause e o capacity Outlet protection should also outlets where the velocity of flow at <br />rom BMPs). <br />pools located at the inlet to or thoutfalle design <br />may result in plunge pools (small p p <br />Outlet protection should be installed early during construction activities, but may be added at any <br />time, as necessary. <br />What to Consider <br />schedule to took <br />The exit velocity of the runoff as eaotethou houldrbeenspe t dconra regulad be <br />levels that minimize erosion. Outlet p <br />for erosion and scouring. Repairs should be made promptly. <br />Advantages of Outlet Protection <br />• Provides, with riprap-line apron (the most easily on mososi eSon outlet protection), a relatively low cost <br />method that can be installed • Removes sediment in addition to reducing flow speed <br />• Can be used at most outlets where the flow speed is high <br />• Is an inexpensive but effective measure <br />• Requires less maintenance than many other measures <br />Disadvantages of Outlet Protection <br />• Maybe unsightly <br />• May cause problems in removing sediment (without removing and replacing the outlet <br />protection structure itself) <br />• May require frequent maintenance for rock outlets with high velocity flows <br />• <br />• <br />4-92