1Department of Soil and Water Engineering, Dr. NTR College of Agricultural Engineering, Bapatla, ANGRAU, Andhra Pradesh State, India
2Acharya N.G. Ranga Agricultural University, Dr. NTR College of Agricultural Engineering, Bapatla, Guntur (Dt.), Andhra Pradesh State, India
3Acharya N.G. Ranga Agricultural University, Lam Guntur, Guntur (Dt), Andhra Pradesh State, India
4Acharya N.G. Ranga Agricultural University, College of Agricultural Engineering, Madakasira, Anantapur (Dt.), Andhra Pradesh State, India
*Corresponding author: ysaisucharitha028@gmail.com (ORCID ID: 0000-0001-6204-4277)
Online published on 22 October, 2020.
In the water scarce situation, measurement of flow in open channel reduce the pressure on water resources and promotes the better utilization of water. The present study aimed at developing critical flow circular flume with rectangular centre contraction. The circular flume was designed by placing rectangular block in a U- shaped channel. Six flumes were fabricated with different contractions and throat lengths (30%, 40% and 50% contractions and 15 cm and 30 cm throat lengths). Water surface profiles were collected for four discharges (6, 9, 12 and 15 Lps). Critical depths were computed and located on the water surface profiles. The study revealed that the critical flow conditions occurred at 15, 12 Lps in all six flumes. At low discharges and low contractions critical flow conditions not occurred in the throat. The head discharge equations were derived the computed discharges are compared with the actual discharges. The highest deviation observed in case of Flume -1 (-8.344%). 90 % of the errors are within the range of ± 5%.
• Measurement of flow in open channel with critical flow concept
• High accuracy of flow measurement
• Suitable for low discharges in field channels
Open channel, Water measurement, Flume, Critical depth, Accuracy
