Weir vs. Wier — Which is Correct Spelling?

A weir or low head dam is a barrier across the width of a river that alters the flow characteristics of water and usually results in a change in the height of the river level. Weirs are also used to control the flow of water for outlets of lakes, ponds, and reservoirs.

A fence or wattle placed in a stream to catch or retain fish.

A dam placed across a river or canal to raise or divert the water, as for a millrace, or to regulate or measure the flow.

An adjustable dam placed across a river to regulate the flow of water downstream.

A fence placed across a river to catch fish.

(obsolete) Seaweed.

A dam in a river to stop and raise the water, for the purpose of conducting it to a mill, forming a fish pond, or the like.

A fence of stakes, brushwood, or the like, set in a stream, tideway, or inlet of the sea, for taking fish.

A long notch with a horizontal edge, as in the top of a vertical plate or plank, through which water flows, - used in measuring the quantity of flowing water.

A low dam built across a stream to raise its level or divert its flow

A fence or wattle built across a stream to catch or retain fish