V-Notches
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FRP V-Notches are useful for seapage measurement of irrigation dam and toe drains. Discharge in V-Notches can measure from 6 lit/second to 120 liter/second. In V-notch, advantage is of head over the crest is large and thus flow remains un-affected by surface tension and viscosity. Limitation of V-Notch is small discharge range and V-plate itself become obstruction to silt and hence not suitable for field channels in irrigation and for waste water management. Ni-Plast make V-Notches are manufacturing confirm to Indian Standard IS 9108:1979 and having molded and engraved gauge marking for measuring discharge in lit/second and level in centimeter. Provision can made on demand to remove V-Plate as and when require cleaning silt gathered in V-Notch. |
| Application :- Seapage measurement of dam in foundation, inspection and top galleries and
toe-drains. Limited use in waste water and laboratories. Range of Cut Throat Flume - 15, 30, 45, 60, 90 and 120 liter/second.(Above 120lit/sec not recommended) Note. : - Electronic Recorder is available on demand for automatic discharge recording. | |
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We offer a wide range of premium quality V-Notch or Sharp Crested Weirs. V-Notches or Sharp Crested Weirs are generally used for measuring small discharges like seepage from drains and gallery of masonry dam or toe drains. V-Notches can measure discharge from 1 lit/sec to 120 lit/sec maximum. For low discharges, V-Notches are superior to Flumes because head over the crest is large and thus flow remains unaffected by surface tension and viscosity. V-Notches have their own limitation and not suitable for discharge measurements in field channels due to obstruction of silt.
The Indian Standards Institute (ISI) has drawn specifications for manufacture of V-Notches. Ni-Plast make V-Notches confirm to Indian Standards IS: 9108-1979.
Mechanical and Electronic recorders are available with Ni-Plast V-Notches these enable automatic data recording of discharge measurements. Periodic discharge measurements at preset time intervals are logged in a data logger that is housed in the electronic recorder unit. The data logger can be connected to a desktop PC to download the data for further processing and generate reports like water seepage, water discharge during a given period of time, water accountability etc.
Salient Features :- Ni-Plast V-Notches are made of prefabricated Fiberglass Reinforced Plastic.
- They are most accurate in dimension & have an extremely smooth surface.
- V-plate with upstream & down stream section is as per IS: 9108-1979.
- 100 % anticorrosive, maintenance free and durable with a life of up to 50 years.
- Engraved & moulded gauge marking shows discharge in cusecs & litres / sec.
- Moulded and engraved discharge table with details of calibration & installation.
- Readymade V-Notch structure very easy to install.
- Automatic recorder for accurate discharge measurement & data recording.