Case: Measurement campaign for calibration of drainage model

Used equipment:

The challenge:

Some time ago, Danova was contacted by EnviDan, who needed a large amount of measurement data, to calibrate a Mike Urban model for Holbæk renseanlæg, which is owned by Fors A / S.

The solution:

We installed and operated 33 flow meters, 17 level meters and 4 rain gauges, over a period of 5 months. It was our task to ensure installation, operation and dismantling of all the meters during the measurement period. From Danova’s data server; 24/7 Data access, it has been possible, for all parties, to follow the measurements, online. After the measurement campaign, EnviDan has retrieved data from the server for use in their further work with the model.

At the start of the campaign, a draft of places to be measured had been made. Danova and EnviDan have inspected all measuring points, but it’s a well known fact, that drawings and reality do not always match. Together we found all the measuring points, but in some places alternatives had to be found, as the well did not exist, was not suitable for measuring, or was just inconvenient in relation to service during the measuring campaign.

The result of the measurement campaign can be read in the October 2017 issue of Spildevand Teknisk Forenings Spildevandsteknisktidsskrift

We used Flow Meters of the type; Correlation as it is the most accurate flow meter for open channels on the market. It is a patented principle developed by Nivus. With this type of meter, we can not only measure accurately, we can also prove that measurement data is correct. This provides great security for our customers, as it is always possible to review data which at first glance does not make sense. For further information of the measurement principle: Measurement principles

The level gauges used were the type of ultrasound, however, in one location there was measured with a pressure transmitter as ultrasound could not be mounted.

The rain gauges were of the tipping bucket type.