| 摘要 |
PURPOSE:To make it possible to measure the underground water level in plural layers by providing a strainer having marked various sections in an arbitrary position of the same well. CONSTITUTION:In measurement of each underground water level of the underground layer having plural water layers, ring, crescent and 1/N division type strainers 1 and 2 are provided in an arbitrary depth position in one well 4 for pumping, etc., and pipes 3 are caused to rise from parts of strainers 1 and 2 respectively, thereby measuring each underground water level of plural layers. |
