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To reduce power production losses as a result of clogging of the trash racks and turbine waterlines it was necessary to rationally arrange the water intake part of the turbine unit. One of the suggestions in this direction, a water intake with through slots in the piers which permit circulation of the trash-freed water behind the trash collectors, was made by Prof. V, G. Aivaz'yan [1, 2] and realized at the Votkin Hydroelectric Power Station. In 1965 the State Trust for the Organization and Efficiency Promotion of Regional Power Stations and Networks investigated this intake to study its operational qualities.The Votkin Hydroelectric Power Station is the penultimate stage in the sequence of hydroelectric power stations on the Kama River, one of the main timber-floating lines of the Urals. Its appreciable degree of wood trash is characteristic, which has led to difficulties in operating the Kama Hydroelectric Power Station [3]. Therefore, when designing the Votkin Hydroelectric Power Station considerable importance was given to controlling trash [4].The machine building of ~e Votkin Hydroelectric Power Station (see Fig. 1) was 273 m long and consists of 5 sections. In each section are two units with a capacity of 100,000 kW each with turbines PL-661-VB-930. The discharge capacity of one turbine is 710 m3/sec (at a design head of 16.5 m). The water intake of each unit is divided by piers into two openings of 10.5 m each. On the right side, toward the machine building, abuts a concrete overflow dam with eight Openings of 20 m each. The hydroelectric scheme also includes earth darns and structures for ships.

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From the Editors. The significant development of hydraulic construction in the USSR determines a permanent increase in the requirements for operating reliability of hydraulic structures. The prospects for steady development of Soviet power underline the great importance of ensuring accident-free operation of hydraulic structures for reliable delivery, to the national economy, of the capacity from hydraulic, thermal, and nuclear power plants, as well as the need for improving, for this purpose, the means and methods of field control of hydraulic structures at the electric plants under construction and in operation. The articles published below are devoted to problems of further improvement of field control of hydraulic structures of electric plants. The Editorial Board hopes that this material will be useful also from the viewpoint of exchange of field control experience, as well as for determination of future scientific and technical activities in this direction. The Editorial Board requests the readers of this Journal to send comments about the published material and to participate in discussions, on these pages, of the problems raised.

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