24 hours per day real-time groundwater data during dewatering and stress handling - Case Study

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Courtesy of Eijkelkamp Soil & Water

Project

Widening of motorway A9 Gaasperdammerweg – Amsterdam

Client

Van Kessel Bronbemaling

Principals

Van Kessel Bronbemaling by order of Visser & Smit Hanab. Visser & Smit Hanab implements the project commissioned by Rijkswaterstaat.

Country

The Netherlands

Background and objective of the project

Widening the A9 Gaasperdammerweg into 2 x 5 lanes and digging a 3 kilometre tunnel will reduce air and noise pollution in Amsterdam Southeast. However, some measures must be taken first before the quality of life improves. Rijkswaterstaat started with this in the beginning of 2014 by moving cables and pipes for water, gas, electricity and telephony. Van Kessel Bronbemaling handles dewatering and stress drainage while these activities are carried out. Since dewatering may have an effect on the ground in the vicinity, a monitoring plan was drawn up and a complete measuring network was set up with sensors, modems and online environment to provide the principal with real-time groundwater data.

Investing in the future

Driekus Kroeze, Head of Implementation at the Geesbrug site and Imre van Hal, Implementation Assistant at Van Kessel Bronbemaling tell us, “The measuring network has 25 sites, all with a deep and shallow monitoring well, fitted with Diver water level loggers that measure the groundwater levels and Global Data Transmitters Multiple that transmit the data to the Eijkelkamp Web Portal. In addition, 72 soil moisture sensors were placed.”

Jan Pellegrom, Head of Implementation at the Buren site explains, “We were searching for a telemetric total package of sensor, modem and online environment, but one that can be expanded. The way I see it, if you just turned 18 you do not start driving a Rolls Royce right off. Working with such a system is all new to us at Van Kessel Bronbemaling. However, we are aware that this telemetric solution will be an obvious requirement as the principal will make it a condition. And Van Kessel Bronbemaling likes to invest in the future.”

Pellegrom: “We asked for a number of quotations, including one from Royal Eijkelkamp whom we already know because we use equipment from you such as the well-known auger. Royal Eijkelkamp scored the best as far as user friendliness was concerned as well as options in the telemetric solution. Moreover it is brilliant that your Eijkelkamp Academy provides environmental knowledge and skill. Sometimes you need someone to do some brain-storming with, and to us that is worth more than just going for the best price.”

5 years too late

Pellegrom says, “It is a pity we did not have this system 5 years ago for the construction of the Westerscheldt intersection between Ossendrecht and Zelzate (Belgium). Someone was continuously measuring the groundwater levels there because the (financial) risk was so great. Now we have real-time data available 24 hours per day, and we can attach alarms to them so you immediately know what is happening. How urgent is it? Do we have to go there now, in the middle of the night, or can it wait until early tomorrow morning? We can play with this now and that is a great advantage.”

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