American Society of Civil Engineers


Desilting Basin System of the Dul Hasti Hydroelectric Project


by Daniel Develay, (Principal Engineer, Coyne et Bellier, Consulting Engineers, 5 rue d’Héliopolis, 75017 Paris, France), Jean Binquet, M.ASCE, (Chf. Engr., Coyne et Bellier, Consulting Engineers, 5 rue d’Héliopolis, 75017 Paris, France), E. Divatia, (Tech. Dir., Nat. Hydroelectric Power Corp., Hemkunt Tower, New Delhi, India), and C. R. Venkatesha, (Chf. Engr., Nat. Hydroelectric Power Corp., Hemkunt Tower, New Delhi, India)

Journal of Hydraulic Engineering, Vol. 122, No. 10, October 1996, pp. 565-572, (doi:  http://dx.doi.org/10.1061/(ASCE)0733-9429(1996)122:10(565))

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Document type: Journal Paper
Abstract: The Dul Hasti Hydroelectric Project located in the lower ranges of the Himalayas on a river carrying heavy sediment loads, especially during the high-flow season (monsoon period), includes a small storage capacity (live and dead storages). Because of these particular features it is an utmost necessity to trap a high percentage of the coarser particles generally made of quartz. To achieve this objective and trap more than 90% of the particles coarser than 0.3 mm, underground desilting basins have been designed on the basis of a theoretical approach further checked and developed using hydraulic model tests. The latter showed that with a design discharge of 123 m³/s a 240-m-long basin equipped with a 48-m diffusor and having a cross-sectional area of 170 m² can satisfactorily meet the requirement.


ASCE Subject Headings:
Basins
Design
Flushing
Hydro power
Sediment
Silts