Parshall Flumes



We are engaged in supplying of top quality Parshall Flume. ‘Ni-Plast’ make Parshall flume is the most accurate device and very suitable for field conditions. Head loss is comparatively less and can operate up to 95% submergence limit. Range of Parshall flumes is from 0.33 cusecs (0.001 cumecs.) to 3285cusecs (93 cumecs). All dimensions of Parshall flumes conform to IS 14371:1996. Accuracy of discharge calibration in Parshall flumes is up to 98%.

Salient Features :

  • ‘Ni-Plast’ Parshall flume is made of prefabricated Fibreglass (FRP) lining.
  • Most accurate in dimensions, converging & diverging angles.
  • Extremely smooth surface with value of N-0.013.
  • All degrees and dimensions conform to IS 14371:1996.
  • 100% anticorrosive, maintenance free and durable up to 50 years.
  • Moulded and engraved discharge table with details of calibration & installation.
  • Easy to install due to ready made shape.
  • Choice in selection of section as per hydraulic parameters of irrigation channel.
  • Automatic gauge recorder for accurate discharge measurement & data recording.
Drawing of Parshall Flume :

Calibration Formula :

Where,
Q = Discharge in cumecs
n = Constant
C = Free flow discharge coefficient
Ha = Water head at u/s gauge

Throat width Section Capacity Discharge for free Flow Submergence Limit Correction factor
In cusecs
Min-Max
In cumecs
Min-Max
0.152 0.05-3.5 0.015-0.10 0.381ha1.53 0.6 -
0.60 0.45-30 0.0125-0.85 1.403ha1.548 0.6 -
1.20 1.25-70 0.035-2.0 2.904ha1.577 0.7 -
2.40 2.8-141 0.1-4.0 6.00ha1.605 0.7 0.8
3.05 5.6-292 0.16-8.28 7.463ha1.6 0.8 1.0
3.66 6.7-518 0.19-14.68 8.859ha1.6 0.8 1.2
4.267 7.4-440 0.21-12.46 10.294ha1.6 0.8 1.4
4.57 8.1-884 0.23-25.04 10.96ha1.6 0.8 1.5
6.10 10.9-1340 0.31-37.97 14.45ha1.6 0.8 2.0
7.62 13.4-1665 0.38-47.16 17.94ha1. 0.8 2.5
9.14 16.14-1989 0.46-56.33 21.44ha1.6 0.8 3.0
12.19 21.18-2638 0.60-74.70 28.43ha1.6 0.8 4.0
15.24 26.48-3285 0.75-93.04 35.41ha1.6 0.8 5.0

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