Abstract
1. Kahokugata is the largest lagoon in Hokuriku Region along Japan Lea. The greater part of its lower coastal plain is an important early-rice producing district in the single crop belt of rice in Ishikawa-ken. As the lagoon has drainage area fifteen times as big as its susface and has 2, 500mm. anual precipitation in average, it frequently causes severe overflows. 2. It is possible to devide this coastal plain into three parts according to the lagoon overflows and the relief of land. The first is a part below the ordinary water level, the second is a part overflowed irregularly, and the. last is a part free from overflows. From the view of the situation of settle-ments, the land use and distribution of flume and drainage types, it isobvious that above division is reasonable. 3. Therefore, every phase of agricultural livings in the Kahoku-lagoon district is not fully explained without considerations of its special. natural conditions, that is, the relief of land and the overflows from the lagoon.
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