The precipitation in Nebraska has been considerably less than normal in the last four years, and in consequence the ground‐water level in many parts of the State has declined to a marked extent. Moreover, in some parts of Nebraska the ground‐water level has declined as the result of land‐drainage, and in other parts it has risen as the result of irrigation with water diverted from streams. These changes in ground‐water level produced by drainage, irrigation, and decreased precipitation have caused wells to fail, streams to cease flowing, lakes to become dry, and land to become water‐logged. Consequently, interest in fluctuations of ground‐water level has greatly increased, and the need of a systematic collection of base‐data for the future study of ground‐water problems has been recognized.