Bagmati Irrigation Project

. Bagmati Irrigation Project (BIP): Established in June 2010
It came into normal operation from July 2013.
. It has command area of 122000 Ha.( Phase I : 68,000 Ha and Phase II: 54000 Ha)
Total design discharge=10500 m3/sec which is a sum of design discharge 8000 m3/sec and by pass channel discharge 2500 m3/sec.
Its canal design discharge is 34000 lt/sec.
Its major source is Bagmati river.
The construction cost of this project is NRS 37,809,610.25 aided Saudi Development Fund.
Its annual operation and maintenance cost is 467,321,000 NRs. (Government, 2072 )
The barrage has total length of 403.50 m with a duty of 1.3 lt/sec. It has total 30 nos. of gate of dimension 9*3m. Also, it has 6nos of under sluices of dimension 9*4m. Similarly, it has 2 nos. of fish ladder of dimension 1.5*4m. In the eastern side, it has 7nos (4*2m) of head regulator with maximum discharge of 74.4 m3/sec and in the western side it has 5 nos. (4*2m) of head regulator with maximum discharge of 48.4 m3/sec.
Aside from the problems inherited from Kathmandu, the middle reach of the basin with steep slopes and degraded watersheds is prone to severe landslides and floods which threaten both infrastructure and settlements, cause increased rural poverty and are the source of heavy sedimentation for the lower reach. (ADB, 24 June 2017) So, the under sluices are provided for the minimization of sedimentation problem. Likewise canal head regulator were provided for the prevention of entry of silt in the canal. Similarly, silt ejectors are also provided on the canal for silt control.
In this irrigation project, the diversion headwork used is the permanent one with weir and barrage structures.
The components from the headwork to the canal outlet: