APPLICANT PACKET - Virginia Department of Conservation and ...
APPLICANT PACKET - Virginia Department of Conservation and ...
APPLICANT PACKET - Virginia Department of Conservation and ...
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9. Emergency Spillway: Vegetative emergency spillways shall not be constructed over fill material.<br />
Design elevations, widths, entrance <strong>and</strong> exit slopes are critical to the successful operation <strong>of</strong> the<br />
spillway <strong>and</strong> should be adhered to closely during construction.<br />
10. Vegetative Stabilization: The embankment <strong>and</strong> emergency spillway <strong>of</strong> the sediment basin shall be<br />
stabilized with temporary or permanent vegetation immediately after installation <strong>of</strong> the basin (see<br />
TEMPORARY SEEDING, Std. & Spec. 3.31 or PERMANENT SEEDING, Std. & Spec. 3.32).<br />
11. Basin Shape: The shape <strong>of</strong> the basin must be such that the length to width ratio is at least 2 to 1. The<br />
correct basin shape can be obtained by proper site selection, excavation, or the use <strong>of</strong> baffles.<br />
Baffles increase the flow length by deflecting the flow. The baffles should be placed halfway<br />
between the inflow point <strong>and</strong> the outflow. Plate 3.14-6 shows the detail for baffle construction <strong>and</strong><br />
three situations where baffles might be used.<br />
Applicant Packet 71<br />
June 2001
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