Select site where straight reach is available in Upstream (U/s) and Downstream (D/s) side of flume. Avoid any obstruction to flow like curves and pipe/road crossings at both ends. Avoid site immediately after fall/drop in embankment. Refer chart, which is given in literature for straight reach, distance from controlling gate & lining.

Installation of Flume :

For normal site condition, 20 to 30 cm excavation below Canal Bed Level (CBL) is sufficient. In Black Cotton (B.C) soil propose additional excavation for B.C. soil treatment if required. Fill up 20 to 30 cm excavated portion by M-100 grade concrete.

Keep 3 times slope to hump to U/s and D/s side. Lay cement sand slurry to backside of flume and rub slowly on hump concrete to remove air. Keep weights inside the flume temporarily for smooth jointing. Cut throat flumes are in one piece but Parshall flumes are in two to ten pieces depending on capacity. In Parshall flume first set convergent flat bottom surface and adjust other joints by taking levels. Use vibrator in the holes of bottom surface for uniform concreting. Construct side wall to both sides of flume and hold fast in brick masonry or UCR or in cement concrete M 150 grade. Give transition up to hump slope length to both ends and 30cm key portion at U/s end.

Finish civil work with smooth plaster. For un-lined canal provide 2 to 3 meter Dry stone pitching for both U/s and D/s side. Provide proper curing.

Discharge Calibration :

When water flows in the canal a hydraulic jump should occur in the flume. For free flow condition, actual ratio of Hb/Ha must be less than submergence limit. In case of free flow condition, accept direct reading on U/s gauge mark, if not, apply correction factor for submerged flow condition. Markings on U/s gauge is at 30 Lit/Sec. For intermediate readings refer discharge table for calibration.