Project Report Channel Lining at the Bank of the River ... - Krismer

J. KRISMER Handelsgesellschaft m.b.H 

A - 6020 Innsbruck - Rum | Bundesstrasse 23 | Tel. (0043) 512/ 263800 | Fax. 263819 

E-mail: office@krismer.at | http://www.krismer.com 

Project Report 

Channel Lining at the Bank of the River Traun 

in Schleißheim near Wels 

Fig. 1: Stabilised terrain - lower section 

(View from the river Traun up to the forest street) 

CHANNEL LINING AT THE BANK OF THE RIVER TRAUN 1 / 18 

© 2007 J. KRISMER Handelsgesellschaft m.b.H. • This document is protected by copyright law. All rights reserved. 

Slope/ Embankment Stabilisation 

Hydraulic Engineering/ Drainage 

Retaining Structures 

Services Special Constructions Rockfall/ Avalanche Protection




General project data Slope/ Embankment Stabilisation 

Client Energie AG Oberösterreich, 

4020 Linz, Oberösterreich 

Design Horst Felbermayr Bau GmbH 

Machstraße 7 , 4600 Wels 

J. Krismer Handelsgesellschaft m.b.H. 

Execution of constructing Horst Felbermayr Bau GmbH 

Machstraße 7 , 4600 Wels 

Setting of tasks Lining of a deep erosion trench in the area between the country 

road to Weisskirchen and the bank of the river Traun near 

Schleißheim/ Wels 

Constructing a stabilised slope drainage and a fastened channel 

in a steep slope to drain off surface water of the road down to 

the river Traun 

Construction method The existing erosion trench was extended to a drainage trench 

which was reinforced with Krismer® System. The trench has a 

draining channel in the form of a trough situated above it, with a 

surface stabilisation also out of Krismer® System. 

Execution time Spring to Summer 2000 

Project volume Total length of the channel measured inclined: ~ 117 m 

Total surface to be reconstructed: ~ 700 m² 

Width of the draining trench: ~ 0.6 - 1.2 m 

Total width of the channel: ~ 6 m 

Angle of gradient of the slope or channel: ~ 40° 

Vertical height (difference of level river- street): ~ 75 m 









Initial Situation Slope/ Embankment Stabilisation 

To maintain a secure use of the street the occurring rain and snow water is drained off the 

street through a small lateral inclination into parallel running longitudinal draining facilities on 

the side, most often draining troughs or spherical shell channels. 

Coming from statutory regulations the water has to be brought back again into the natural 

circle of the water. Mostly this happens immediately where possible through laterally passing 

the water out into the surrounding terrain. In the surrounding terrain the water should ooze 

away. 

On account of the global climate changes and the increase of extreme weather caprioles 

conditioned thereby, the frequency and amplitude of extreme rain and snow fall incidents 

has strongly increased in wide parts of Europe during the past years. Also the street draining 

facilities are immediately affected of this. They can not ooze away the big quantities of rain 

and snow water in the surrounding terrain without causing damages as initially planed. 

In the here mentioned project „Traunufer/ Wels“ the draining off the water from the street into 

the surrounding wooded area caused an always deeper eroding trench because of the big 

quantity of the surface water. 

The terrain steeply sloping from the country road to the river Traun was eroded on a length of 

117m up to a depth of 1.50 m. Half of the width of a forest road crossing this section was 

swept away by the erosion. In the sequel the forest road was unusable for the managing of 

the forest. 

In this area near Wels the river Traun is used for the energy production and therefore it is 

dammed up to a river power station. Through the erosion of the embankment the dammed 

water often became muddy. Because of the washed in fine sediments a damage of the 

power station equipment could not longer be excluded. 

Central setting of task for the reconstructing work was to eliminate the damage in form of a 

very deep erosion trench, to make the forest road usable again and to construct a stable 

channel for the future drainage of the street water. 

The first design intended to build a coursed rock fill out of coarse river stones which would 

have had a single weight of approx. 1.000 up to 2.000 kg per piece. 

The coursed rock fill should start at the bank of the river Traun and should at least be built up 

to the level of the forest road. For the section above the forest road the construction of a 

draining pipe was planed which should have drained off the street water into the coursed 

rock fill. 

This variant for the project was too expensive and too troublesome because of some 

problems with the basement for the coursed rock filling, the troublesome and expensive 

transportation of the stones to the constructing site (entry way was only possible on the little 

bearing forest road) and the technically very troublesome installation of the piping line in the 

steep slope. 









Additionally the whole stabilisation work should be done without severe affects on and 

constant injuries to the landscape because the terrain is very good seen and is used as close 

recreation area. 

The mentioned situation induced the constructing company Felbermayr to give a special 

constructing suggestion using the Krismer® System. 

Constructing suggestion with Krismer® System 

- Extension of the existing erosion trench to a drainage trench, width at least 0.60 m up to 

1.20m, depth at least 1.0 m to 1.50 m; 

- Filling up the drainage trench with easy to deliver stone material in stone sizes up to maximal 

32 mm to 60 mm; 

- Stabilising of the draining body with three-dimensional steel lattice mats, anchored with the 

underground with earth nails; forming a terrain trough (opening width approx. 6 m) and 

- stabilising of the whole trough with Krismer® System as additional possible draining facility for 

the street water in the case of a flood. 

- Applying humus and greening of all parts which are not permanently overflowed with water 

guaranties a perfect reintegration of the construction work into the surrounding natural river 

landscape. 

The construction method drainage-and channel-constructing with “Krismer® System” as 

presented was proved to meet all these requirements of the stabilization in a perfect way, 

therefore this method was executed. 

Fig. 2: Excavation work for the drainage trench, reconstructing an 

attractive terrain course and constructing a terrain trough 

The work was realised with a cross country digger and partly 

manual 










Drainage and Channel Constructing with Krismer® System - System Structure Slope/ Embankment Stabilisation 

Construction – middle part with underneath laying draining trench 

(starting from the finished surface) 

- cover net: wire netting, type Maccaferri, mesh size 50/70 mm, wire size 2 mm, galvanised, 

fixed with steel clamps type Spenax 11 G 40 

- first layer (top layer) Krismer® System: three-dimensional steel lattice mats laid diagonally to 

the drop line, type J.K.S. A02-80|1,5-FEZ, height = 80 mm, fixed with special T-steel nails (with 

welded-on hook and point), reinforced with galvanised distribution rods Ø 10 mm, type 

R10/2500 or R10/3700 

- approx. 50 – 60 cm deep stone filling of the trench underneath the first layer of steel lattice 

mats, stone sizes 32 to 60mm, quantity per running metre approx. 0,50 m³ 

- second layer Krismer® System: three-dimensional steel lattice mats laid like the drop line, 

type J.K.S. A02-80|1,5-FEZ, height = 80 mm, fixed with special T-steel nails (with welded-on 

hook and point), reinforced with galvanised distribution rods Ø 10 mm, type R10/1200 

- approx. 50 – 60 cm deep stone filling, quantity per running metre approx. 0,50 m³ 

- third layer Krismer® System: like second layer 

- geotextile, grammage approx. 200g/m² 

Constructing a channel – lateral parts (left and right of the middle part) 

(starting from the finished surface) 

- approx. 3 cm humus with seeding to develop a compact sward 

- cover net: wire netting, type Maccaferri, mesh size 50/70 mm, wire size 2 mm, galvanised, 

fixed with steel clamps type Spenax 11 G 40 

- top layer Krismer® System: three-dimensional steel lattice mats laid diagonally to the drop 

line, type J.K.S. A02-80|1,5-FEZ, height = 80 mm, fixed with special T-steel nails (with weldedon 

hook and point), reinforced with galvanised distribution rods Ø 10 mm, type R10/2500 or 

R10/3700 

- stone filling of the three-dimensional J.K.S. – steel lattice mats with crushed stones, stone size 

32 to 60 mm, volume approx. 5 to 6 m³ per 100 m² 

- geotextile, grammage approx. 200g/m² 









Project Realisation Slope/ Embankment Stabilisation 

Fig. 3: Line of sight from the street down to the river Traun 

+ with finished excavated trench 

+ laid out with geotextile 

+ three-dimensional steel lattice mats (third lowest layer) laid on the trench bottom, 

laid out like the drop line, width approx. 0,60 m, fixed with special T-steel nails 

+ stone filling first layer 

To increase the connecting effect of the Krismer® System with the under ground additional 

continuous distributions rods were pushed into the three-dimensional lattice mats. The 

distribution rods with the standard length of 2500 mm were manually cut into the fitting width 

for the installation in the trench (e.g. trench width = 0.60 m - length of distribution rod = 0.55 m) 









Fig. 4: Line of sight from the river Traun up to the street 

Installing of the second layer (middle layer) of three-dimensional steel lattice mats on top of 

the first layer of stone filling (approx. 50 – 60 cm deep), three-dimensional steel lattice mats 

laid out like the drop line of the slope, width approx. 1.20 – 2.40 m 

To increase the compound effect of the Krismer® System with the subsoil additional 

continuous distributions rods were pushed into the three-dimensional lattice mats. The 

distribution rods with the standard length of 2500 mm were manually cut into the fitting width 

for the installation in the trench (e.g. trench width = 1.20 m - length of distribution rod = 1.10 m) 










Fig. 5: Line of sight from the river Traun up to the street 

Creating a trough, opening width approx. 6 m 

Installing of the first layer (top layer) of three-dimensional steel lattice mats on top of the 

second layer of stone filling approx. 0.50 m deep, laying of the steel lattice mats diagonally to 

the run of the channel (=almost the drop line of the slope) reinforced with distribution rods R 

10/2500 and fixed with galvanised earth-nails T 25/1500 - T 25/1800. 

The ramming of the nails was done with a manual guided jack hammer with special 

percussion attachment. 

Along the edges of the trough the complete construction was tied up into the original terrain 

1.0 m up to 1.5 m width. Along the marginal zones the steel lattice mats were fixed with earth 

nails at a distance of approx. 1 m. 










Fig. 6: Line of sight from the top to the forest road or to the river 

On both sides of the completed channel the parts which were tied up into the terrain are 

toped with humus and a cover net laid down on the whole surface. 

The use of Krismer® System for the construction of a channel enables an effective draining off 

of surface water in combination with a deeper lying drainage for the frost-resistant collecting 

and draining off of slope water. 










Fig. 7: Line of sight from the forest road down to the river 

The seeding was done with mineralogical and also with biological long-term-fertilizer. By 

doing this the growth of the plants should be accelerated and a fast and thick growing of the 

roots should be achieved, which leads to an additional strengthening of the protection 

against erosion. 










Fig. 8: Bank stabilisation with Krismer® System (2000) 

One year after the completion of the construction works the channel- stabilisation concept 

with the Krismer® System requires an additional fertilizing of the bank surface. 

This was done and is good to form a stronger and thicker sward. 








Stabilisation 



Embankment 

Result Slope/ 

In the course of the channel lining on the bank of the river Traun the Krismer® System was 

carried out to stabilise the terrain. 

As results of this construction project the following provable effects could be achieved: 

• long-lasting protection of the bank surface against all types of erosion 

• the deep reaching compound effect and the stable construction of the three-dimensional 

steel lattice panels oppose optimally the tractive force of the water 

• surface securing stays water permeable and prevents an excessive build up of the flow 

pressure 

• the stone filling of the drainage trench decisively reduces the rate of flow 

• except the installed system nails no excessive basements were necessary 

• the construction is insensitive for consolidation of the subsoil (= flexible construction) 

• all system components including the filling material can be transported to the constructing 

site in the steep slope very easily 

• the stabilised top soil layer forms the basis for a long-lasting growing of plants 

• Using the Krismer® System enabled us to optimally stabilise the channel in a steep slope 

with an inclination of 40°. Using this ecologically desirable, plant-able construction 

valuable natural landscape could be saved or a once devastated surface could be recultivated 

again. 









Appendix: Additional Photos Slope/ Embankment Stabilisation

Project Report Channel Lining at the Bank of the River ... - Krismer

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