Twin Plate Weir: A Flow Measuring Device

For efficient use of water, accurate measurement of flow in (field/laboratory) channels isrequired for many water resource projects. the present work is aimed to study the flow characteristicsof a twin plate weir (two sharp-crested plates are placed one behind the other at some distance) underfree and submerged flow condi tions. experiments are performed with four spacing of the twin plateweir ranging from 10 em to 40 em under free and submerged flow conditions . it was observed that thecoefficient of discha rge (cd) is a function of head over the crest (h i) and height of the plate of theweir (p) in free flow condition. the critical submergence (h2/hi ) increases as the discharge increases.for a particular spacing of the twin plate weir (l). the critica l submergence also increases with theincrease in the spacing of the weir plates for any discharge, when some material fills the spacebetween the two plates, the cd increases as the percentage of fill ing increase, the device may provequite useful when siltation occur s between the twin plate weirs. the device could be utilized inlaboratory/industry channe ls for the discharge measurement