National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Weirs are overflow structures used to measure flow or to control the water elevation. In sharp crested weirs sharp edge in the crest causes the water to spring clear of the crest and thus accurate measurements can be made and results beneficial to tail end farms in a field channel. Hence, sharp crested weirs are used for experimentation. The research project was envisaged with the following objectives to develop sharp crested rectangular weirs with 30°, 45° and 60° edge angles. They are coefficient of discharge and to compute energy loss for different discharges under free flow conditions. In this present study, three were installed individually under each test run in the hydraulic flume permanent set up in the hydraulic laboratory of and the water surface profiles for each case were drawn. Under each test run, the results indicated that the Coefficient of discharge varies from 0.16-0.93 as per increase in discharge levels and energy loss attained more for 5 lps (i.e., exceeded 2.0 cm) as compared to other discharges (i.e., within 0.5 cm). Out of the three geometries tested for the weirs, 15 cm crest height with 30° reduced sharp crested rectangular weir (Weir-I) performed better in terms of all parameters including cost of design which will enable a significant contribution while installation of water measurement in small scale irrigation system.
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