The weir with thick crest is known as
The weir with thick crest is known as Correct Answer Broad crested weir
Drowned weir: When the liquid level on the discharged side is above the weir crest
Broad crested weir: It has a broad crest and the flowing fluid has a surface contact with the weir crest
[ alt="SSC JE ME Fluid Mechanics (31-60) images 15" src="//storage.googleapis.com/tb-img/production/16/10/SSC%20JE%20ME_Fluid%20Mechanics%20%2831-60%29_images_15.PNG" style="height:242px; width:425px">
Suppresses weir: It is as wide as the channel and the width of the nappe is same as the length of the crest. There is no lateral contraction of the flow stream.
Free weir: Liquid level on the downstream side is below the weir crest. Both the upper and lower surfaces of the nappe are exposed to the atmosphere.