Fish Passage. Fish passage to and from the district waterways is restricted by several features within the drainage infrastructure. A dike system protecting the district from flood and tidal flows generally blocks the passage of adult and juvenile fish. In those cases where waterways intersect the levee system, passage is restricted by a culvert fitted with some sort of tide regulating mechanism or is blocked entirely by the dike system. Either of these features strictly limits the access of fish to and from the system except in those instances where floodwaters top or breach the system. In some cases, waterways that intersect the dike system are fitted with pump stations that facilitate the export of water over and through the dike. These pump stations are often used as backup mechanisms to conventional gravity discharge so that heavy storm related flows can be managed more effectively. Adult and juvenile fish can be entrained into the pumps during their downstream migration where they can be injured or killed. The majority of drainage pump facilities are associated with culvert/tide gate complexes through which upstream and downstream passage of adult and juvenile fish is possible, though limited. The primary point of access for fish to and from the system is located at those intersections where the gravity flow drainage is managed by a culvert fitted with some sort of tide regulating feature. Though tide gates do not completely block the upstream passage of adult and juvenile fish, upstream passage is restricted to very narrow windows of the tide cycles during which the tide gate is open and the discharge velocity does not exceed the upstream swimming capabilities of the individual fish. The window for upstream passage is greater for adult fish than for juvenile fish because of their stronger swimming capabilities. Tide gates do not completely block the downstream passage of adult and juvenile fish though downstream passage is limited to the low tide cycles when the water surface elevation upstream of the tide gate is sufficiently greater than the water surface elevation downstream of the tide gate to create the head differential to open the tide gate.
Fish Passage. 1. Each branch of a river where fish moves must have a fish passage at the deepest point in the water. The width of the fish passage must be a third of the width of the water during the usual low water period. A fish passage in a watercourse flowing into the river in accordance with the legislation of the relevant country shall continue at the same width all the way to the fish passage in the river.
2. A fishing gear or other device may not be placed or used so that the movement of fish in the fish passage may be prevented or fish cannot access the passage or move in it. When fishing in a fish passage using a specific type of drift net ("kulkuverkko" or "xxxxx" in Finnish) at least half of the width of the passage shall be open. If a certain party has a specific right to close a fish passage for fishing, this right shall remain.
Fish Passage. The water diversion facility shall be designed, constructed, and maintained so it does not prevent, impede, or tend to prevent or impede the passing of fish upstream or downstream, as required by California Fish and Game Code section 5901.
Fish Passage. During the period 2011-2025, restore historical fish migratory routes by opening 1,000 additional stream miles, with restoration success indicated by the presence of river xxxxxxx, American shad, Hickory shad, Xxxxx Xxxxx and/or American eel.
Fish Passage. The plan will include a program to enhance passage to suitable spawning and rearing habitat. It will incorporate the priorities listed below, unless the Adaptive Management Team established pursuant to paragraph 7.2 determines other priorities.
Fish Passage. Progress: 82 of outcome achieved Removing the barriers that block migratory fish from reaching their spawning grounds can reduce sediment build-up in streams and allow shad, xxxxxxx and other species to move between fresh- and saltwater habitats. Between July 2013 and June 2014, of forest buffers planted. Progress: 13 of annual outcome achieved Forest buffers stabilize stream banks, prevent pollution from entering waterways, provide food and habitat to wildlife, and keep streams cool during hot weather. BAY BAROMETER 2014-2015 Health and Restoration in the Chesapeake Bay Watershed In 2014, of underwater grasses in the Bay.
Fish Passage. Upstream fish passage conditions will be evaluated under a dam removal scenario. This will be accomplished by using the hydraulic model of the dam removal developed under Task 5.2. If the dam were to be removed, a series of steep gradient rapids could exist where the dam is currently located. VHB will review the existing HEC‐RAS model to verify that the existing model in combination with further hydraulic modeling performed under Task 5.2 is suitable for this analysis. We will rely on both existing bathymetric data and additional bathymetric and hydraulics of the river developed under Tasks 2.2 and
Fish Passage. In-stream flows contained in Appendix C, Tables 1 and 2 for Soda Springs, Fish Creek, and Lemolo 2 bypass reaches include flows necessary for proper operation and maintenance of fish passage facilities at the respective dams. No additional in-stream flows shall be required for these purposes.
