Precision-machined overflow plate for measuring small to medium seepage flow rates in dams and drainage channels.
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Precision-machined overflow plate for measuring small to medium seepage flow rates in dams and drainage channels.
The Geolook V Notch Weir is a simple yet highly accurate mechanical device used to measure the flow rate of water in open channels, typically used for seepage monitoring in dam galleries and drainage ditches. By forcing water to flow through a precisely machined 'V' shaped opening, the height of the water above the notch (the head) becomes directly proportional to the flow rate. When combined with a staff gauge or an automated water level sensor, it provides a reliable and continuous measurement of leakage, which is a primary indicator of a dam's structural health.
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The V Notch Weir operates on the principle of open-channel hydraulics. As water pools behind the plate, it creates a 'head' of pressure. The geometry of the 'V' shape ensures that even very small increases in flow result in measurable changes in water height.
This makes the V-notch far superior to rectangular weirs for monitoring seepage, as seepage is often a low-flow event where high precision is required to detect early-stage leaks.
For accurate results, the water must approach the weir smoothly. We recommend a 'Stilling Basin' or baffle plates upstream of the weir to remove turbulence and ensure the water surface is calm.
The plate must be installed perfectly level and the 'sharp' edge of the notch must face upstream to ensure a clean 'nappe' (the sheet of water flowing over the weir) which prevents sticking and surface tension errors.
Flow is calculated using the Kindsvater-Shen formula or similar standard discharge equations. The only variable required is the 'head' (H), which is the height of the water surface above the bottom of the V-notch.
For manual monitoring, a staff gauge is fixed to the channel wall. For automated monitoring, an ultrasonic sensor or a vibrating wire piezometer is placed in a 'stilling well' upstream of the weir to provide continuous electronic data.
In dam safety, 'Seepage is the Story.' A sudden increase in seepage flow, or a change in the clarity of the water (indicating internal erosion or 'piping'), is the earliest warning sign of potential dam failure. The G90-Z500 provides the reliable baseline data needed to identify these trends before they become critical.
The V Notch Weir operates on the principle of open-channel hydraulics. As water pools behind the plate, it creates a 'head' of pressure. The geometry of the 'V' shape ensures that even very small increases in flow result in measurable changes in water height.
This makes the V-notch far superior to rectangular weirs for monitoring seepage, as seepage is often a low-flow event where high precision is required to detect early-stage leaks.
Flow is calculated using the Kindsvater-Shen formula or similar standard discharge equations. The only variable required is the 'head' (H), which is the height of the water surface above the bottom of the V-notch.
For manual monitoring, a staff gauge is fixed to the channel wall. For automated monitoring, an ultrasonic sensor or a vibrating wire piezometer is placed in a 'stilling well' upstream of the weir to provide continuous electronic data.
For accurate results, the water must approach the weir smoothly. We recommend a 'Stilling Basin' or baffle plates upstream of the weir to remove turbulence and ensure the water surface is calm.
The plate must be installed perfectly level and the 'sharp' edge of the notch must face upstream to ensure a clean 'nappe' (the sheet of water flowing over the weir) which prevents sticking and surface tension errors.
In dam safety, 'Seepage is the Story.' A sudden increase in seepage flow, or a change in the clarity of the water (indicating internal erosion or 'piping'), is the earliest warning sign of potential dam failure. The G90-Z500 provides the reliable baseline data needed to identify these trends before they become critical.
We are currently updating the specific model configurations and technical datasheets for this product category.