From the area of Jeløya - Moss, southern Norway, five springs draining fissured-rock aquifers, and one artesian well draining confined water from a sand and gravel aquifer were studied during the year period 7 June 1977 to 6 June 1978. This study has given valuable information about discharge variations, the amounts of water stored in the aquifers, as well as about the residence-time of the water in the aquifers. The springs are fed from groundwater bodies with chemical compositions close to that of deep circulating groundwaters, 30–100 m below land surface. Brackish water in the artesian well is mainly due to the dissolution of fossil sea salts.

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