Friday, April 3, 2026

Policy trends in river and flood management in the Netherlands since the 2010s - part 5

This part has a local case studies of spatial management in river areas, showcasing how the different policies translate to implementation in practice.

 

De doorbraak – waterboard Vechtstromen and municipality Almelo[i], [ii]

 

The project called ‘the breakthrough’ is acting as an example project for future large investment projects and lauded by the Delta Commissioner. Multiple stakeholders invested in creating a completely new 13km long stream through four municipalities. Likewise, it has multiple functions, namely to store water and protect the city Almelo from floods, and to act as nature and recreation area. It was mainly made possible by having the government purchase farm lands when people were willing to move or trade lands. The project was completed, and evaluated in 2018 on the following aspects:

·       Content: to what extent were the intended goals and results reached?

·    Management: how were time, money, organization, risks, quality, and communication managed? When were which decisions made?

·       Rounding up: To what extent was the project finished and which activities remain?

 

From a financial perspective some goals were met and some were not. The budget was overdrawn by 11.7 million euros to a total of 52.5 million euros. However, nearly 50% of these costs were funded by external partners. Despite its runtime of several years, the project timeline was extended by only a few months. While the water is not running through completely, the safety goals are met. There is now room for additional water storage of 320,000 m3 and 600 hectares for flooding. The natural design of the area is aligned with the goals of the Ecological Main Structure policy guidelines and is performing beyond expectations as several rare species have been observed. Additional benefits include a better division of farmlands between owners, and increased tourism and recreation. The strengths mentioned are the great internal and external cooperation between many different stakeholders, the attention to communication, and the focus on results. Improvement points include managing expectations, waiting for support from other stakeholders, and having a single clear message per organization.

 

A map of a river

AI-generated content may be incorrect.

Figure: Image of the route of the project De Doorbraak[iii]

Thursday, April 2, 2026

Drought research network event - first visitors to our new roofs!

Today we had a networking event for drought research, with over 10 people being the first official research visitors to our new roofs, while the other attendants visited the waterlab or the DISC.

 

A common question was how to compare the rooms/roofs when they are not all oriented in the same way. Originally we did request a new building to be constructed that would allow for identical rooms and orientation, but as this was not possible due to permits, we have to make due with what we have. The difference in orientation, and also use, will have to be taken into account when comparing results.

We also hope to see the vegetation growing in the coming months and to be able to identify the different species as they bloom.  









Wednesday, April 1, 2026

Construction of green roofs by Dakbloemenweide

Today three different types of green roofs were installed by Dakbloemenweide. This was complicated at the start by ice on the roof, which still had to be broken down and shovelled off. Once this was done, the bottom layer was installed to prevent leakages. The second layer catches water and is covered by a filter that prevents root growth. Next is the soil and vegetation, which could finally be complemented by sensors. 

The three types of roof are:

extensive green roof: 6 cm soil

thicker green roof: 9 cm soil

blue-green roof: 9 cm soil, thicker retention layer 



































 

 

 

Policy trends in river and flood management in the Netherlands since the 2010s - part 5

This part has a local cas e  studies of spatial management in river areas, showcasing how the different policies translate to implementation...