| 摘要 |
<P>PROBLEM TO BE SOLVED: To surely distribute water to a trunk water channel side and a branch water channel side by a fixed diversion ratio independent of rotational irrigation by means similar to the one for the time of calm water even during drought time. <P>SOLUTION: A diversion mechanism 2 of a water channel includes a flow rate controller which is provided on a diversion port 4 for diverting a part of water flow from a trunk water channel 20 to a branch water channel 21 and a water passage port 5 for making the remaining water flow pass through to the downstream, and controls the water flow passing through the respective ports 4 and 5. The flow rate controller includes: an underflow adjusting plate 10 which is provided so as to be vertically displaced on both ports 4 and 5, opens both ports at the almost same opening, allows passing of the water flow at the lower part and blocks overflow from an upper end; and an adjusting rod 11 which vertically displaces the underflow adjusting plate 10 and adjusting the opening. The underflow adjusting plate 10 is constituted of one rectangular plate to be integrally displaced over both ports, and the vertical direction dimension is made almost equal to or larger than a height dimension Llmt of a design water level of the water channel. <P>COPYRIGHT: (C)2012,JPO&INPIT |
