Abstract
There are 64 springs in this area and they are found in following geologic members: Daisen'tuff-breccia, Nagata pumice bed, Nisiobara tuff-breccia of Daisen pyroclastic group, Tataradoyama andesite, Habeyama andesite, Tubogameyama andesite of Daisen andesite group and alluvium.
For attempt to quantitative consideration about spring resource, trial calculations of discharge of spring are computed, and results are as follows:
1) Discharge averages of spring in each geologic members belong to 4 class (discharge 1x102-1x101' l/sec).
2) Apparent unit area discharges of spring in several geologic members are 103-104 M3/day/KM2. Moreover apparent unit area discharge of spring is ratio total discharge of springs in same geologic member to total area of that member.
3) Both discharge average and apparent unit area discharge ranks following order: Spring in Tubogameyama andesite Spring in Nabeyama andesite Spring in Tataradoyama andesite.
From above results, the writer conjectures that spring resource in Daisen andesite group is prominent quantitatively than in Daisen pyroclastic group.
