How a green park became a rainwater treatment solution in Spain

A project implemented in the Malata district (A Coruña, Spain) is an excellent example of how Noggerath® overflow screens protect coastal waters in Spain and how engineering solutions can blend harmoniously into the environment. Here, in compliance with the requirements of EU Directive 91/271/EEC, a rainwater collection and treatment system was created, which also serves as a green recreational area.

Spain – a country where long periods of drought alternate with sudden downpours

Why are such decisions becoming a necessity in Spain?

Spain is a country where long periods of drought alternate with sudden downpours, and where water shortages are becoming increasingly common. Long dry spells followed by sudden, intense rainfall pose challenges for both water storage and wastewater management. Therefore, it is very important that:

• Every drop of rainwater would be collected and stored,
• And the excess flow – smoothly cleaned of debris and impurities – would be discharged into the environment without harming it.

This is precisely the solution that has been implemented in the Malata district, where a green park has been created with hidden overflow screens that not only protect against flooding but also ensure water quality before it reaches the sensitive coastal region.

Problem – excess flow

On rainy days, the city’s sewer system was unable to cope with the increased flow. Once capacity limits were exceeded, some of the untreated mixture of rainwater and sewage could enter the mouth of the Ferrol River, a sensitive natural area.

The solution – Noggerath® overflow screens

To protect nature, a rainwater park was built near residential areas to collect, store, and filter excess runoff before releasing it into the natural environment. Noggerath® OVF overflow screens play a key role here, automatically retaining coarse impurities, debris, and organic matter.

The screens were selected to reduce hydraulic resistance and efficiently direct the retained material into the common collection chamber.

Processes over 1300 liters per second!

Technical data:

2 x OVF 500/4150 (6 mm perforation, 1340 l/s each)

2 x OVF 300/3750 (6 mm perforation, 750 l/s)

2 x OVF 300/2500 (6 mm perforation, 348–750 l/s)

After just a few months of operation, operators noticed a significant reduction in pollutants in the discharged water.

Result

After just a few months of operation, operators noticed a significant reduction in pollutants in the discharged water, while local residents enjoyed a new green space. This project demonstrated that modern technological solutions can be not only effective, but also aesthetically appealing.Just as Noggerath® overflow screens protect coastal waters in Spain, they could protect our rivers and lakes in Lithuania.

👉 Read more about OVF overflow screens here

Contact us and help us find out how we can improve your wastewater treatment processes!