Finland, Sweden and Norway – comments to proposal on flood hazard mapping

Flood hazard mapping Risk based approach Mapping is not necessary when: Currently no substantial risk Risk is not expected to grow substantially in a long term perspective Low risk areas: Flood prone areas can be identified simpler – e.g. profiles from historic floods

Flood hazard mapping Why ? How? Large unpopulated areas Further development will be in connection to already developed areas Mapping will be unreasonably expensive How? Each country make a pre-study to identify areas relevant for mapping, must document that risk is 0 or very low

Finland Population density: 17 people per km2 Land use: 30% marsh land 10% lakes and rivers 20 000 km rivers 56 000 lakes, shoreline 300 000km

Sweden Population density: 20 people per km2 Land use: Forest: 54% Mountains 16% Cultivated land 8% Lakes and rivers 9% Marshlands and mire ~30 % (some parts are forested) 100 000 km rivers; 10 000 km are being mapped 92 400 lakes

Norway Population density: 15 per km2 Land use: 53 000 km rivers Mountainous: 44% Forest: 38% Glaciers, lakes and rivers: 7% Marsh land: 6% Farm land: 3% Developed: 1% 53 000 km rivers (map scale 1: 1 000 000) 1100 km are currently being mapped

Mountainous Birch forest Conifer forest Farm land Cities Mountainous Telemark county

Telemark county

Protection plans

Map scale is of importance! Catchment 1:1 000 000 1:50 000 1:250 000 Glomma (41971 km²) 17120 km 53182 km 30655 km Drammen (17112 km²) 7461 km 26152 km 15359 km Skien (10811 km²) 5242 km 19119 km 10295 km