| A Natural Channel Design (NCD) stream restoration effort incorporates many components to improve stream stability, including cross vanes. Cross vane rock structures and their downstream scour pools are constructed in the stream channel. Cross vanes are primarily designed to maintain a stable channel width and depth. Secondarily, their design is intended to improve aquatic habitat. Hydraulic and geomorphic analyses determine their design and placement. As part of a stream restoration project, twelve cross vanes were constructed along a 3400-foot reach of the Batavia Kill, located in the Catskill Mountains, in Greene County, New York. A post-construction assessment of the cross vanes included an analysis of the constructed cross vanes' deviation from the design dimension, an evaluation of the factors influencing scour pool depth and a study of the aquatic insects as an indicator of success. The scour pool dimensions may be used as an early indicator of cross vane failure. |
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