The high level of the water table in the Linth Valley in Switzerland and Its consequences the basic issue this project deals with. The main economical activity in the area is agriculture and is sustained through intensive drainage of the fields due to the fact that the water table is close or some times above the ground level, depending on the period of the year. The result of this action is the shrinking of the ground, which in the very near future will lead to the complete sinking of the ground surface turning the grass fields into swamps.
In order to prevent the above course and preserve agriculture as a main activity in the area, this project focuses on a solution that proposes two main actions connected topologically and economically in an balanced way. The first action is the digging of the most problematic areas, as far as concern the proximity to water table, and the second is the use of the digging material to fill the less endangered parts of the valley, neighboring the previous areas, in order to be secured without the need of intensive drainage. The result of those two actions will be the raise of the ground level by creating lakes.
“17 postcards from Linth valley”
FROM ANALYSIS TO DESIGN
Testing the microtopography tool on sand model
Simulation of the water table impact based on color coding. The blue color range charters the areas where the water table covers the ground surface. Dark blue means deeper flooded areas and light blue shallower. The green color range charters ground surface in proximity to the water table. Dark green means bigger distance from the water table “safer areas “, while light green means smaller distance from the water table “endangered areas”
student: Mohamed Abdel Wahab
Ancient Egypt, Ancient China, Ancient India, the Fertile Crescent. These are just some of the great river civilizations.
The Linth valley is an artificially drained and pumped valley using the pumping stations and the canals on either side of the Linth canal to do so. In the next decade the cost of the pumping and draining will exceed the revenue from the agriculture in the area. If pumping were to stop then some areas would transform into flooded marshes and would not be viable for use. My concept is to reimagine the area surrounding the Linth canal, transform it from a single functional element, to a multi-functional entity.
Looking at the area between the Obersee and the Walnsee I was able to see that the areas flooded were left and right of the Linth canal. Also by analyzing the urban growth from the years 1860 to 2014 I could see that farms and towns were being built closer and closer to the valley. With this data I decided to focus to the right of the Linth canal, near the town of Uznach. The first step was to assume that the pumping would stop. Since there would inevitably be a flood in the agricultural lands, I decided to create a lake. This lake would attract many different people with different needs. Using height maps, I traced the areas that would flood if the water table moved up two meters, and designated the edges as the lakes farthest most boundaries. The second step was to supply this lake with enough clean water for people to use. This meant that I would have to use the water from the Linth canal, as it carries no sediments and to determine a location for a deviation from the canal to the lake. This also meant that I could designate a natural filtration area for the side canals. Analyzing the height maps determined the optimum area of deviation, where there would be no backflow and not too far from the lake, I deduced it would be at the draining and pumping station. The exit point for the water would be at Böschkanal.
To create this lake, the area between the edges would have to be dug up. The depot would serve to level the imagined areas surrounding the lake. The depot would be approximately one million cubic meters of soil. This information, along with a set perimeter between the highway and Linth canal, which also acted as a grid generator, as my constraints, I imagined the spaces that could exist around the lake. The first proposal imagines the area as a mix between open public spaces and built areas, with the built spaces occupying 69% of the leveled area. The lake would cover the entire area between the edges and be mostly shallow. The second proposal shows an area with a more active language and 85% of built space. In this proposal the lake has a smaller area with a deeper lakebed. The third proposal shows the area as a modified version of what it is now. The area would be mostly agricultural and the built space would only occupy 50% of the leveled area. The lake would have the smallest area but would also have the deepest lakebed. In the first two alternatives the area of middle relative height is used mostly for parks and recreational areas, while in the third alternative it acts as the agricultural land. In order to keep the lake water level consistent the Linth deviation would have to block and slow most of the water down before entering the lake. By conducting an experiment using a large-scale milled model of the deviation and actual water, I was able to get real time results of various interventions to slow the water down.
The three alternates I designed are not a set absolute. They could be mixed with each other or there could be many other alternates that would work in the area. The lake acts as a generator for many different ideas…
The basic idea was to widen the Linth Canal and use advantage of the energy for the the lighting concept in the recreation park. In the meanwhile another goal was the improvement of the corridors for the people and the wild animals in Grynau (linking both Linth areas and the design of a new recreation park between Tuggen and Benken as an attraction for the Linth region.
Basic elements of our design approach were the design of the new bridge over the Linth, the regeneration of tree lines along to old river courses, as well as the new river course of the Bösch Canal.
Linthebene, movies about landscape perception
– UAV Mapping (photo-copter) for DTM and Orthophoto generation
– Tethered Riverboat (acoustic Doppler current profiler, ADCP) > Measure
the water current velocities over a depth range and the cross-section of
– Milling machine for terrain models
– GIS (geoportal of swisstopo: Geo Map Admin)
– Grasshopper for Simulation of the water amount with data from Bafu.
– RhinoCAD,3dsmax & photoshop for 3D Visualization of the project
student: Gaganjit Singh
Design of a water park along the Linth canal, from lake Wallen to the lake of Zurich.
FROM ANALYSIS TO DESIGN
“Through the looking glass”
Considering the small height differences in the valley, the new park-design follows the micro-topographical traces of the old river along the canal. At the same time, the designing phase of the proposal is based on our attempts to solve the flooding problem of the nothern part of the valley and to connect the two opposite sides of the canal.
Through solving the infrastructural problem of the water network, we design public space for the residents but we also attempt to establish the new water park as a pole of attraction and future developement.
The following project, deals with a hybrid landscape of fragmented rural and urban characteristics, in the Linthebene area, by the end of Zürichsee.
The dominant infrastructural water network, that divides the valley in two, as well as the parallel urban spines lacking perpendicular connections to the Linth canal, were perceived as the major problems in our design approach.
Important fragments along the Linth such as the several natural reserve areas, the renaturalization of the old Linth river and the untouched nature-”jungle” on the waterfront were used as a starting point in our approach. In the same fragmented way our design intervention focuses on three different points of the site.
Our main goal was to propose a new adaptive, according to its context, system that would solve the specific problems of each area and would in a larger scale connect the existing cities through a new network of pathways to the “new Linth”, unifying the design.
Starting from Wallensee, the main approach was to regenerate and redesign the existing renaturalized area, in order to make it more accecible for the locals. Technically it would also function as a buffer zone in case of an extreme flooding scenario. Perpendicular pathways create possibilities for crossing over to the inbetween island.
Moreover, in the Kaltbrunner Riet, which is artificially preserved as a natural reserve area (at the lowest topographical height of the terrain), a system of polders is designed, collecting the waters of the valley and leading them to the side canal and eventually to Zürichsee, to replace the pumping. In addition to the polders, the redesign of the edges between the expanded canal and the terrain makes it possible for the rest of the existing drainage system, to function withought the pump, due to gravitation that makes it possible to flow directly into the new side canal.
Last, our main focus was to redesign the watermouth of the area, that was completely degraded and unused. It would function as an attractor for the whole area of the Linthebene, creating a strong connection between the city of Schmerikon and the expanded Linth, bringing the locals closer to the new recreational character of the water. A parallel system of three worlds, starting from the city of Schmerikon, to the intermediate level of the cubic wetlands leading to the untouched, less accessible nature of the “jungle”, create a triptychon of transition from the hard to the soft edge.
Major elements of the design approach was the new water system, that reverses the idea of the water as an infrastructural one and turns it into a recreational one. The vegetation types, create three microenvironmvents, the cubic wetlands with the “jungle”, the safe green area of the city as well as the vegetation of the polders. The already mentioned system of pathways for walking and biking, with their variations according to the spot on site, give new experiences to visitors.
Main strategies regarding the whole site in a large scale, was the managment of the water system. Through the expansion of the side canal and the Linth, together with the lowering of the inbetween dikes we managed to create different speeds and depths of water, change the perception of the water in the area as an obstacle and make it an accecible recreational area. The infiltration of the sediments of the existing drainage systems cleans the water before it flows to the sidecanal from the mainland. The constrain of the flood zones by diging up these areas and creating higher dikes around them was also part of the water management plan, concluding in the watermouth redesign.
Instructor: Susanne Hofer Within the last MAS LA module we concentrated on exploring video as an experimental tool for analysing, highlighting a certain aspect of our design proposal or as a visualization tool. As guests we welcomed Marie Laverre and Nadine Schütz.
Our video results _”ORDINARY PLACES”
“Through the looking glass”
“17 postcards from Linth valley”
student: Gaganjit Singh
student: Mohamed Abdel Hawab