How should a groyne be designed?

Four key considerations for designing a groyne are shape, length, spacing, and direction. The groyne should be shaped like a triangle with a base along the shore and a “hockey stick” end, which is a downstream facing bend in the groyne. Groyne’s should be spaced so the flow can’t reach the banks, and they should … Continued

Groynes are structures built perpendicular to the shoreline of the coast of an ocean or river. They are built from stone, wood, or steel and are used to deflect flows away from the bank, thereby preventing erosion. They are typically shaped like a hockey stick. There are generally two orientations for groynes that you’ll observe … Continued

There are nine key aspects to consider when designing a rock riffle: location, sizing your material, keying, grading, flow through, backwater creation, flanking, sediment trap efficiency, and hydraulic jump. It is important to ensure that the chute geometry and rock size are matched with the expected flow conditions, establish a footing or foundation for the … Continued

Rock riffles have several benefits for stream restoration, including channel stability, improved water quality, enhanced fish passage, and creation of fish habitat for spawning, foraging, and rearing. Rock riffles control the velocity of flow and reduce downstream sediment movement, which helps create bank stability. They also create turbulence that aerates the water, and raise the … Continued

A rock riffle is a structure in a river channel that helps improve fish passage and stabilize banks. It consists of a rock pyramid with specific slope ratios (3:1 or 4:1 upstream & 20:1 downstream). When built across a river, it can raise water levels upstream, which can help with bank stabilization, but may also … Continued