A solid state storage system includes a memory area having a plurality of pages and is capable of storing program information about each page. Nonlinear phase conjugation of the low power beam results in a high power encoded return beam that automatically tracks the input beam and is corrected for atmospheric distortion. The system eliminates the acoustic lens system, thereby reducing the size and cost of the system. A reservoir part which stores a predetermined amount of river water and supplies the river water to an inside of the unit soil layer is provided in an upper end part of the unit soil layer.