RAINFALL FLOODS PROTECTION BY THE CHANNEL RAPID STRUCTURE
Methods of flood control actual for mountain regions are considered in the article.There was adduced the Western experience on clearing riverbeds and efficiency of small catching water storage reservoirs delaying flood flow. Authors analyzed riverbed clearing effect and gave an explanation ofinefficiency of channel clearing for the increase of discharge capacity. Also authors computed the required cross-sectional dimensions of channel discharge necessary for experienced flood flow discharge of the Adagum river. Recommended by authors flood control system of the Adagum river basin using temporary catching water reservoirs, formed by rapids or low dams that entrap the rainfall runoff in riverbed. Rapid constructions with consideration for free-flow of low summer discharge and fishway were adduced. Construction schemes of rapids can be built by different materials. Construction schemes of rapids with different forms of rapid spillways were adduced. Authors set out formulas for calculating the required number of rapids, constructed in the riverbed and the average amount of water retained in the reservoir formed by one rapid. Authors made a conclusion about the reliability of flood control system, consisting of a “dry” catching water reservoirs controlled flash flood runoff to a settlement.