SMDMP will combine hydropower and irrigation benefits and has been declared a National Pride project by the Nepalese government. SMEC will lead a joint venture with EMAY, Jade Consult and CMS Nepal.
This multi-purpose project comprises a conventional concrete diversion weir structure (barrage and under sluice bay) across the Sunkoshi River. A discharge of 67 cumecs will be diverted through an intake structure. The diverted water will be passed through a desander to remove silt, before being conveyed via a 13.1 km concrete lined headrace tunnel to a new surface powerhouse on the Marin River.
The available head between the intake and powerhouse will be utilised to generate 28.62 MW. The water downstream of the tailrace will flow through the Marin and Bagmati rivers and will facilitate a year-round irrigation for approximately 122,000 hectares of irrigable land around Bagmati, helping to increase agricultural productivity whilst contributing to the growing energy needs of the country.
Geo-politically, this project will help keep balance in the use of water resources among the provinces. Eventually the project will help recharge ground water storage and augment base flow in local streams, resulting positive effects in the environment.
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Specialists from SMEC’s Water Resources team will deliver technical presentations at the 2023 Floodplain Management Australia National Conference in Sydney. The annual event has been hosted by the FMA for over 50 years, and is the most esteemed flood risk management forum of its kind in Australia.
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