Climatic and ground conditions Climatic conditions: As a maritime location, the site experiences strong winds with demanding environmental conditions. For example, air humidity is higher, and winds stronger, than inland. The cycles of freezing and thawing also place special demands on the specification and durability of structures and materials to be used in the project. As a northerly country, Finland is also framed by short winter days contrasted with long summer days. For more information about the climatic conditions, please see http://en.ilmatieteenlaitos.fi/home. Ground conditions: The quayside area is approximately +2.5 meters above sea level. The makeup of the ground within the site is predominantly infill and clay. The infill layer is to a depth of circa -10 meters with the clay layer between -10 and -19 meters. Below this is a layer of sand and moraine with bedrock at around -22 meters. The infill layers are at least partly contaminated. Reconditioning of the soil would also be required. Due to this contamination, any removal of topsoil must be disposed of in the proper manner and in accordance with Finnish law. The water table within the site area is almost equal to sea level (see below). Sea level: The average sea level is around +0.2 meters, varying typically between +0.8 to -0.2 meters. The highest sea level measured in Helsinki (2005) was +1.7 meters. The city recommendations are that buildings on the waterfront should have a ground-floor slab set at +3.1 meters. Any structures below this would need to be of watertight construction.
Guggenheim Helsinki Design Competition