SediCon Sluicers at Khimti headworks SediCon Sluicers in the entrance zone of the desanders at Khimti headworks are removing sand, gravel and stones up to 200 mm at rate of 3000 m3 per hour. The water consumption is less than five m3 water per m3 sediment removed.
60 MW Khimti HPP, 80 km east of Kathmandu in Nepal is a run-of-the-river plant that exploits 680 m of head on Khimti Khola. It has since 2000 been a major contributor to the Nepalese electricity grid, and generates 350 GWh annually, nearly 15 % of Nepal’s electricity.
The intake is located on Khimti Khola, a Tributary to Tamakoshi, 80 km east of Kathmandu. Coordinates are 27°33’2.39”N, 84 86°10’10.79”E.
Khimti HPP is owned and operated by Himal Power (controlled by SN Power).
The desilting basins at Khimti are twice as large as the size dictated by this criterion, and removes nearly all particles above 0,13 mm. Thick sediment deposits in the expansion zone has prevented operation of the main flushing system, and manual excavation and flushing of the desilting basins have been frequently required.
SediCon Sluicers were installed in expansion zone in the upstream end of the desilting basin. The SediCon Sluicers can be operated intermittent or continuously, and can remove at least 3000 m3 sediment per hour.
Date of implementation:
The `SediCon Sluicers were commissioned September 2010.
Total capacity of the system was measured to 3000 m3 sediment deposits per hour. On average, 5m3 water was required to remove one m3 sediment. Flushing discharge each SediCon Sluicer is 1,0 m3/s. Average sediment concentration was measured (during SAT) to be 11 % by volume, whereas maximum concentration was more than 20,5 % by volume. Grain size d50, of the sediments removed was 04 – 0,7 mm.
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