Friendly-user control structures

FRIENDLY-USER CONTROL STRUCTURES

1. IRAN: Guilan project. Long-crested weir on Fumen canal.

2. MEXICO: Composite cross-regulator. The radial gates are used for large flow adjustments whereas the side weirs compensate normal flow fluctuations.

3. DOMINICAN REPUBLIC: Yaque del Norte project. This Begemann counter-weight gate installed upstream of a drop structure provides nearly constant level and constant flow at farm offtakes.

4. INDONESIA: Kedung Ombo Project. Sidorejo Canal. This 13 km long canal is automatically operated under downstream control.

5. Control Center.

6. A composite regulator consisting of a side weir and a remotely-controlled slide gate.

MOROCCO Haouz Irrigation Project. Canal de Rocade under dynamic regulation.

7. PERU: La Joya Irrigation District. Flow divider on the main canal.

SOME STRUCTURES TO AVOID

8. CHO (Constant-Head Orifice) offtakes; Because of the relative complexity of operation.

9. Rominj gate: Because of the fluctuation of the flow rate with minor changes in the water levels of the supply canal. As shown here, sluice-gated cross-regulators combined with Rominj-gated offtakes is the worst of all combinations of structures from the hydraulic point of view.

FROM CONVENTIONAL TO INNOVATIVE DESIGN

10. Conventional design

11. Construction of long-crested weir

12. Modular distributor

MEXICO
Tepalcatepec-Cupatizio Project.
The conventional gated structures were modified by replacing one or two slide-gates by long-crested weirs and replacing CHO gates at offtakes by fiberglass modular distributors.

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Cover photographs by Hervlusquellec and Hans Wolter
ISBN 0-8213-2819-0