Taunusstein - Germany

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HydroBend® Weir Gates

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The challenge

According to ATV A128 [Wastewater Technology Association], rainwater overflow basins and retaining canals are to be furnished with spillway dams. In the event of strong rainfall they divert excess water into the surrounding bodies of water. The upper edge of the spillway dam is the maximum storage level with which the chargeable storage volume is determined. The overflow height h0 may not be taken into consideration. During utilisation of the Steinhardt weir gates the overflow height h0 may be utilised for determination of the chargeable storage volume.

The method

The water level pertaining to the overflow height h0 is raised through the utilisation of Steinhardt weir gates on the spillway dams. The new maximum storage level is kept constant in the centimetre range without external energy. The Steinhardt weir gates discharge the excess water if more water flows into the dammed basins than is discharged. They adapt to the variable loads.

The solution

HydroBend weir gates are mounted on spillway dams. They are bottom-hinged. If the water level exceeds the maximum storage level, the weir gate lowers. The water is discharged via the upper edge of the gate. The water level then lowers to the maximum storage level. If the water level continues to reduce, the weir gate is raised until the maximum storage level is reached again or the discharge is completed.
The control of the Steinhardt weir gate is affected without external energy by means of counterforce power plants, which are optionally controlled via springs or weights, for instance. The weir gate – which functions with adjustable counterweights via cables and control valves – is raised and lowered in proportion to the water level / water pressure. The control valve, computable for various tasks, is decisive for the exact maintenance of the maximum storage level.
In the event of backpressure, the counterforce power plant can be optionally upgraded, and the reduction of the overflow quantity can be compensated with retention of the maximum storage level (inquire about details). Alternatively, the weir gate can be provided as a flood protection valve.
In addition to the discharge frequency, the overflow quantity can also be computed by means of an optional rotary valuator. The data can be recorded or transmitted. Please inquire with our Measurement & Control department.

The advantages

Activated storage volume
Keeps water level constant
Reduces discharge frequency
Protects bodies of water
Devoid of external energy
Modular structure
Reliable operation
Adjustable water level
Retrofittable
Low-maintenance
Robust stainless steel construction
Optional backpressure compensation
Optional backpressure safeguard
Optional remote effect, angular measurement

The efficiency

Avoids construction costs
Retrofittable on spillway dams
Increases chargeable basin volume
Toughening of existing discharges