816— Sediment Control Basins and Stormwater Detention Ponds

800-43 Section 816 — Sediment Control Basins and Stormwater

Detention Ponds 816.1 Description 1 Construct temporary and permanent sediment control basins and stormwater detention ponds. 816.1.1 Basins and Ponds 1 A Sediment Control Basin is a temporary basin that is u sed during construction to trap sediment in stormwater before exiting the right -of-way. 2 A Stormwater Detention Pond is a permanent “dry pond” structure that is us ed to detain stormwater for a period of time to reduce the peak flow rate. Detention Ponds consist of a basin storage area, a dam, an outfall structure, an emergency spillway, and a security fence with gate. 3 A Water Quality Pond is a permanent stormwater “wet ” or “retention” structure designed to treat stormwater runoff for pollutants of concern. A water quality pond requires a specific design to be included in the P lans. Water Quality Ponds consist of a basin storage area, a dam, an outfall structure, an emergency spillway , and a security fence with gate. 4 If a Detention Pond and Water Quality Pond is us ed for sediment control during construction, this is considered a “Multi -purpose Basin.” The guidance for adaptation of a detention pond to a multi -purpose pond is contained in the notes section of the Standard Drawings . 816.1.2 Types of Outlets 1 A temporary outlet control structure is the discharge device for a sediment control basin and a multipurpose basin during construction. 2 A permanent outlet control structure is the discharge device for a detention pond and water quality pond. 816.2 Materials 1 Use materials conforming to the material requirements in the specifications referenced in the following table.