New "Modified H-Flumes"
Around the start of this year the disicion was made to install new measuring weirs. These weirs are designed according to the "Field manual for research in agricultural hydrology" from the United States Department of Agriculture (Handbook number 224). By evaluating the existing measurements over the past eight years, it was decided to use modified H-Flumes. These modified H-Flumes can measure higher flows through raised walls. Other advantages are less welding work and therefore little warping of the stainless steel, and not to forget the price-performance efficiency.
The calibration process for establishing the water level-discharge relationship can be seen in the pictures.