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Florida Erosion and Sediment Control Inspector's Manual Maximum velocities r The maximum allowable velocity in the emergency spillway channel will depend upon the type of lining used . For vegetated linings , allowable velocities are listed in Table 5 . 35a ( STORMWATER CONVEYANCE CHANNEL - Section 5, 35 - ES BMP 1 . 35 ) . For ` non-erodible linings, such as concrete or asphalt paving and riprap , design velocities may be increased . However, the emergency spillway channel shall return the flow to the natural channel at a non-eroding velocity. See Appendix 1 . 26A for design details . Stabilization of the Embankment and Basin The embankment of the sediment basin shall be temporarily seeded within 15 days after its completion as per TEMPORARY SEEDING - Section 6 . 65 ( ES BMP 1 . 65 ) . If excavation is required in the basin , side slopes should not be steeper than 2 : 1 . Cleanout .r Sediment shall be removed from the basin when the capacity is reduced to 55 cubic yards per acre ( 104 M 3/ha) of drainage area . This elevation should be clearly marked , preferably on the riser. Plans for the sediment basin shall state the methods for disposing of sediment removed from the basin . Possible alternatives are the use of the material in fill areas on-site or removal to an approved off-site dump . Final removal • Sediment basin plans shall show the final disposition of the sediment basin afterthe upstream drainage area is stabilized . The plans shall specify methods for the removal of excess water lying over the sediment, stabilization of the basin site , and the disposal of any excess material . .�. Sediment shall not be flushed into the stream or drainageway. Safes r. Sediment basins are attractive to children and can be very dangerous . Therefore, they should be fenced or otherwise made inaccessible to persons or animals unless this is deemed •r unnecessary due to the remoteness of the site or other circumstances . Strategically placed signs around the impoundment reading " DANGER-QUICKSAND" should also be installed . In any case , local ordinances and regulations regarding health and safety must be adhered to . Construction Specifications Site Preparation Areas under the embankment and any structural works shall be cleared , grubbed , and " stripped of topsoil to remove trees , vegetation , roots , or other objectionable material . In order to facilitate cleanout and restoration , the pool area (measured at the top of the principal spillway) will be cleared of all brush and trees . ■r 4-90