Admin Order 58-09-07-F - Laserfiche WebLink

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Zone, /WP Waterside Protection Overlay Zone or /WB Wetland Buffer Overlay Zone. 2. Headwater stream. A natural or constructed waterway that, on March 9, 2009: (a) Had all or a portion of their length on slopes greater than 10%; (b) Was a minimum of 500 feet in length including infrastructure culverts; (c) Provided stormwater drainage for an upstream area of 10 acres or more; (d) Had discernable streambed and side banks; (e) Carried water at least part of the year; (f) Provided a drainage function for surface runoff from land areas beyond a roadway; (g) If ponded, had an inlet and outlet drainage function; and (h) Was not already protected by the NR Natural Resource Zone, the /WR Water Resources Conservation Overlay Zone, /WP Waterside Protection Overlay Zone or /WB Wetland Buffer Overlay Zone. 3. Streambank instability. Streambank instability is characterized by the erosion and eventual sloughing of bank material onto the bed of the waterway. This may be caused by such things as removal of riparian vegetation or physical disturbance of the sloped area within a waterway channel, or where the toe of a bank slope is undermined by bed incision. 4. Streambed downeutting. Also referred to as incision, streambed downcutting is the vertical erosion of the channel bed leading to increased channel confinement and deepening of the bed, often characterized by small channels or rills in the early stages and deep, wide gullies in later stages. This may be caused by such things as the loss of riparian vegetation or changes in stream flow. 5. Tributary to a 303(d) waterway. A natural or constructed waterway that, on March 9, 2009: (a) Directly connected to a 303(d) waterway; (b) Was in an open condition, except for existing culverts installed to enable waterway crossings for public and private infrastructure including, but not limited to, railroads, streets, driveways, parking lots, sanitary sewer mains, stormwater mains, water mains, gas mains, or electrical conduits and existing stormwater pipes less than 100 feet in length; (c) Had discernable streambed and side banks; (d) Carried water at least part of the year; (e) Provided a drainage function for surface runoff from land areas beyond a roadway; (f) If ponded, had an inlet and outlet drainage function; and (g) Was not already protected by the NR Natural Resource Zone, the /WR Water Resources Conservation Overlay Zone, /WP Waterside Protection Overlay Zone or /WB Wetland Buffer Overlay Zone. 6. Water Quality Waterways. The waterways depicted on the City's adopted Water Quality Waterways Map. Administrative Order - Page 4 of 12