Unit area discharge of groundwater, Z of typical groundwater basins in Chugoku-Shikoku District was computed, and the relation between Z and their hydrogeological conditions was inspected. The results are as follows:
(1) It seems that there is a mutual relation between Z of confined and unconfined groundwater of Shikoku Setonaikai coastal plain areas, Hirusenbara area and Misato area and Y value. Value, Y is a ratio of total annual precipitation in the catchment area of groundwater basin to the area of groundwater basin.
(2) It is also noted to be some mutual connections between Z of Shikoku Setonaikai coastal plain areas and the degree of development of aquifer, especially of gravel bed.
(3) Apparent unit area discharge of spring, Z of the North-West area of Mt. Daisen Volcano and Kusama Karst areas shows a linear zonal relationship with discharge average of spring in “Z-Q-n/A” diagram (Fig. 7).
(4) Though land-subsidence by over-pumping has not been occurred in Shikoku Setonaikai coastal plain areas, Z of these areas shows higher value than that of typical land subsidence areas in Japan such as Tokyo downtown area, Osaka sea-side area and Niigata coastal plain area. Salt-water intrusion has been occured in some coastal aquifers of Shikoku Setonaikai coastal plain areas. From above results, the author insists to be of importance to compare Z of various groundwater basins with their hydrogeological conditions for the evaluation, further development and the conservation of groundwater resources.

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The practical values surveyed by means of electric prospectings have their seasonal variations according to the geology of the area.
In every four seasons they have peculiar p-a curves, especially in the pyroclastic areas. On the seasonal variations in the former paper by the author, someone were against him, though they should recognize the fact that the features of the p-a curves resulted from the practical survey coincide with the geology of the practical area. And then, their attitudes as if they close their eyes to facts on the ground that the seasonal variations of p-a curves do not coincide with their theoretical values, must be revised frankly.

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The conservation of the farm-land is most important to the agriculture on the slope.
The progress of the agriculture on the slope and there erosion are related to the geological condition.
I study that relation all over the country.

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