Drop structure

This grouted sloping boulder drop on Trabuco Creek in California is almost entirely covered by floodwater.

The canal spillway of Laguna Diversion Dam, shown here, uses a baffle chute drop structure to pass water to a lower elevation.

A drop structure, also known as a grade control, sill, or weir, is a manmade structure, typically small and built on minor streams, or as part of a dam's spillway, to pass water to a lower elevation while controlling the energy and velocity of the water as it passes over. Unlike most dams, drop structures are usually not built for water impoundment, diversion or raising the water level. Mostly built on watercourses with steep gradients, they serve other purposes such as water oxygenation and erosion prevention.

单词	Drop structure
释义	Drop structure 原声例句 Emma的美味英语 Notice again that we've dropped the standard question structure here and it's common in English, in informal conversations just to drop the structure of a question and just use intonation to signal it. 注意哦，我们在这里也是没有用标准的问句结构，这在英语中非常常见，在非正式对话中省略掉问句的结构，用语调来表示这是个问句。英语百科 Drop structure A drop structure, also known as a grade control, sill, or weir, is a manmade structure, typically small and built on minor streams, or as part of a dam's spillway, to pass water to a lower elevation while controlling the energy and velocity of the water as it passes over. Unlike most dams, drop structures are usually not built for water impoundment, diversion or raising the water level. Mostly built on watercourses with steep gradients, they serve other purposes such as water oxygenation and erosion prevention.
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