Summary
The map gives a total evaluation of the water yield capacity from the best aguifers, either bedrock or superficial deposits, marked by colours from yellow to bluish green. The map also deicts topography, bedrock geology, constructions and surface hydrology. In the Precambrian rock, major joints along N 30°, N 120° and partly N 0°, N 40° and N 160° trends are considered to be best. The water yield capacities of the different Precambrian rocks and the Drammengranite, which together occupy almost the entire map area, are very much the same, except for the amphibolites and metagabbros which yield less than half of the others.
