Constructed measures

Here we show some of our measures constructed in the project

A formerly piped part of a tributary (Rothugget) now opened up and a new stream constructed in 2018. This is the inlet to a new constructed wetland

The new stream during high flow in October 2019

The new stream continues north and some parts are also here modified with stones to give good habitat and cope with elevation/topography. This part was constructed in 2019.

The final part (constructed 2019) yet further upstream. Now we have managed to connect the Trönningeå stream with the part of the tributary containing good reproduction sites for Salmon and Trout. With the conversion of ca 800 m of drainage pipes into an open streambed and two wetlands, the fish now have free migration all the way upstream to the reproduction sites!

A constructed wetland in the tributary ”Perstorpsbäcken”, constructed 2018.

One of the Optimized Constructed Wetlands (OCW) with shallow ridges to increase sedimentation. Constructed 2017

One of the 275 nestboxes for birds we have  put up (starlings nesting)

One of the amphibian ponds, constructed 2017

One of the Integrated Buffer zones, constructed 2018

An amphibian pond, constructed 2018, which have been a very good habitat for newts, frogs and dragonflies according to our surveys.

Photo with drone showing several measures along the stream (Level Wetlands, Optimized Constructed Wetlands, Integrated Buffer Zones) after removal of the migration barrier. The wetlands are not yet filled with water when th photo was taken in August 2017

In order to decrease floods at Trönninge village and the nearby farmland we have excavated the slopes of the stream downstream the village. By increasing the cross section area for ca 1 km length, this part now function as a stormwater magasine (ca 3000 – 4000 m3 increased storage capacity) and will also lead to better run-off. The southern (left) side was done in 2017 and the northern (right) in 2018.

Flow situation during a Class 1 warning by SMHI (February 2019) in the part of the stream where we have sloped the sides of the streambed to increas flow. It shows no floods of farmland and the increased stream cross section area seems to handle high flows well.

Removal of the migration barrier, June 2016. A temporary ”stone wall” was placed in the stream to avoid (minimze) down stream particle transport.