Which is a sign of a poorly constructed sediment basin?

A poorly constructed sediment basin may exhibit signs of water seeping around the outfall pipe through the embankment. This indicates a failure in the structural integrity of the basin, which can lead to erosion and instability of the embankment itself. Such seepage can compromise the basin's ability to effectively manage sediment and runoff, as it suggests that the design does not properly contain the water within the basin or control the outflow effectively. Proper construction should include a well-sealed outfall pipe that prevents water from escaping around it, ensuring that the basin remains functional and the sediment control objectives are met.

Other signs, such as water being detained in the basin after rain, may not necessarily indicate poor construction, as it could be a normal response to rain events depending on design and drainage capacity. A riser structure seated in a concrete base and a combined anti-vortex and trash rack are indicative of thoughtful design features aimed at enhancing the function and durability of the sediment basin, rather than signs of poor construction.