HALF-DAM Russian patent published in 2016 - IPC E02B7/00 

FIELD: energy.

SUBSTANCE: disclosed solution, being part of a hydraulic structure, unlike conventional dams does not form a constant reservoir and controls floodgate or controls it only partially; and serves as a barrier, providing possibility of automatic lifting of level of water only in freshet period, and controls weir; directing partially by natural bed, and a large part of destructive floods is directed into a new bed or tunnel arranged for carry-over of these excess in another region on other side watershed (pool other river) for further rational use as intended. Dam body which is divided into bays and consists of base 2, supports with counterforts 1, upper above supports of structure 3 with roadway 4, flood gates, valve gates 6, controlling drain, mechanisms for maintenance 8 of valve gates 6. In all spans there are unclosed openings 5 for continuous sluiceway equal to total cross-section area required for drought flow. Dam comprises a removal channel, mark for bottom 9 is received at level not below top of water discharge openings 5 to excessive flood waters in another direction. Once drain approaches low, switching water into pool other river is stopped and reduced natural drainage system, without any disturbance of environment. It is possible, when in middle span such half-dam provided with gate (valve gate) to allow passage of small vessels in inter-flood periods. Disclosed solution is alternative since it does not disturb natural spawning because in body of half-dam there are openings that are unclosed during entire period and are located in tail, that is, lower bed of river, which provides free travel of fish in both directions. Cleaning also occurs since openings provide drain for not less than drought flow period, and also downstream flood water flows are added, and water to clean enough and practically does not disturb environment. Other positive aspects of present solution should also be noted: 1) because mirror of upper pond of considerable area is formed only for a short time (at time of floods), and then drops over time (decreases), loss associated with evaporation, which is specific for reservoirs, considerably reduced; 2) there is no silting; 3) as a result of absence of stagnation water of upper pond there is no problem "blossoming" (overgrowing algae).

EFFECT: it is possible also to use present solution stripping, that is, have half-dam on both sides of watershed and movement of natural floods arrange in either side depending on circumstances, thus alleviating thus their effect.

1 cl, 3 dwg