1. The grooveless multisectional gate permits closing openings of any width without dividing the conduit into sevetal smaller openings at the place of gate installation. 2. The absence of grooves and piers improves the hydraulic conditions of the entire conduit's operation. 3. The use of water pressure for operating the gate eliminates the need for powerful hoists. 4. For heads up to 70–80 m the multisectional grooveless mechanical-acting gate without a pressure chamber which does not impose high demands on the accuracy of installing the roller paths and facings of the gate guide, has the greatest prospects.