Stakeholders

The case area is in Ranheim and contains the new development Grilstad Marina and Grilstadfjæra. Grilstad Marina is currently still under construction, starting up in 2010 and is planning on finishing between 2028-2030 (Koteng, 2023). The area contains mixed-use, industrial offices and commercial buildings, dominated by residential housing. The construction is developed on artificial land/filling compounds, built on marine clay. The area is surrounded by Trondheimsfjorden and is connected to the mainland by one main road in the middle and two pedestrian bridges on the east and the west sides of the area. The main road is planned to handle emergency vehicles to the main entrances of the area. There is a lot of area dedicated to marina for smaller boats (Trondheim kommune, 2018).

For residential and commercial buildings, there will be underground parking solutions. These will be reached by car by ramps from the main road, with staircases and elevators for access to the buildings from the parking garages. Visitors and customers can use the surface level parking spots (Trondheim kommune, 2018).

The topography of the area is flat, with rising elevation on the southern part of the section. The area has a few green structures today, and more planned for the current constructions. Little natural vegetation on the surface of the area in the construction and newly developed areas. The planned solution for overwater is to lead the water by green structures and adjacent from built structures, leading to pools that will even out the stream of water (Trondheim kommune, 2018).

Concerns about Grilstad

According to NGU, parts of the northern breakwater are sinking up to 20 mm each year (NGU, 2023). This data does not affect the housing development but will have an affect on how well the breakwater will handle flow streams and waves. The area has no risk from being affected by landslides as the marine clay is solid and the filling is constructed to handle waves and water flow. The area is considered to have a yellow risk for flood from sea-level rise and rainwater, which means there are needed measures for potential risks. The buildings have to consider the potential impact of storm surge and sea level rise and have to calculate the housing development based on 3 meters by the year 2100. The development has been planned accordingly with Trondheim municipality and the municipality plan. Grilstad Marina is a private company (Trondheim kommune, 2018). There are different facilities in the area; Flipper café, Coop Extra (food shop), commercial offices, Grillstadfjæra kindergarten, and a kayak rental.