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2. Notched -Step Weir — A large notched -step concrete weir controls the rate of flow <br /> from the Lower Amazon Restoration Project to the natural channel of Amazon <br /> Creek. The weir allows storm runoff to flood the wetland area inside the levee <br /> that surrounds the project in order to redirect flows into the higher channel invert <br /> of Amazon Diversion Channel. Except for a rare obstruction of the lower most - <br /> step in the weir, this facility does not require maintenance before or during a <br /> significant high water event. <br /> 3. Manually Controlled Gate Valve — In addition to the above mentioned step weir <br /> and the Amazon Diversion Channel, there is one additional outlet through the <br /> levee system that surrounds the Lower Amazon Restoration Project. This is a <br /> manually controlled gate valve that connects to a pipe system under both the <br /> levee and Royal Avenue. This was constructed as part of the Lower Amazon <br /> Restoration Project with the purpose of controlling the surface water level in a <br /> portion of the project that was being restored to wetland. However, it is no longer <br /> used for this purpose and is kept closed all year. The gate valve screw control is <br /> located in a concrete vault atop the levee, just south of the bike path near the <br /> corner of Royal Avenue and Greenhill Road As a precaution, POS Division <br /> wetland maintenance staff inspect the gate valve control each fall to make sure it <br /> is locked in the closed position. <br /> 4. Under Channel Box Culverts — Two box culverts were constructed underneath <br /> the levees and flow channel as part of the project. Each is perpendicular to the <br /> channel and has a flow invert of the natural drainage channel for which they were <br /> constructed. As such they are not siphons, but rather at grade tunnels for the <br /> low lying drainages to reach the other side of the project. <br /> The first of these, at project station 105 +85, is located approximately 3800 feet <br /> east of Fir Butte Road The second, at project station 159 +40, is located <br /> approximately 220 feet east of Greenhill Road. Each of these should be <br /> inspected periodically to check for obstructions and leaks. <br /> B. Access <br /> 1. Routine Access — For that portion of the Amazon Creek Flood Control Works that <br /> is within the urbanized area of Eugene, the top of bank is generally flush with or <br /> below the elevation of the adjacent land. As such, there are no levee segments <br /> through the urbanized area. Routine access to the banks of the flood channel is <br /> available via numerous public street crossings of the channel, multi - purpose <br /> paved paths or graveled roads along the top of one or both banks, adjacent <br /> public streets, adjacent public lands, or paved portions of private property. <br /> Except for mid -block segments of the concrete section of the channel, there is <br /> relatively good access anywhere that is necessary within the urbanized area. <br /> The levee segments of Amazon Creek can generally be thought of as starting <br /> downstream of the rail line trestle that spans the flood channel at the southerly <br /> boundary of the Lower Amazon Creek Restoration Project. The original levees of <br /> Emergency Response Plan for Amazon Creek 10 September, 2008 <br /> P: \Cdocs\AP WARefDocs \E mergency Mg mt <br />