Senvariya village in Kathiya Mathiya Gram Panchayat under Sikta block of West Champaran district selected pyne-desiltation works under MGNREGS. The agricultural fields that are far from the proposed irrigation channels and without access to bore wells are left fallow in the rabi season. The high runoff of water during monsoon leads to severe soil erosion in the area. On the other hand, during the peak monsoon, the entire area gets water logged because of the dead pynes and the lack of proper drainage. Due to encroachment, water logging and silt accumulation farm productivity was severely affected due to which many farmers in the villages migrated during the monsoon months.
The DFID funded Infrastructure for Climate Resilient Growth (ICRG) programme team visited the site and assessed parameters such as soil, slope and flood risk. Although this is an existing structure, the site was found to be appropriate. The second pyne was directly connected with the main irrigation canal from where irrigation water flows through other pynes. The ICRG team suggested specific design changes to enhance adequate drainage, minimise the runoff and soil erosion and also prevent water logging in the area. This will increase availability of water in the pynes which will in turn help in recharging of ground water in the surrounding area. This will enable farmers to grow rabi and summer crops as well as reduce the risk of flood by interlinking of pynes in the area.
The total cost of the structure is Rs. 6.63 lakhs for widening and deepening of one of the pynes (total length 3600 ft), and Rs. 0.93 lakh for renovation of the second pyne (total length 1500 ft).
The following design changes were recommended to make the structure more climate resilient:
Renovating the two pynes will ensure irrigation for about 20 ha of agricultural land and therefore benefit around 75 households. Deepening and widening of irrigation channel (defunct pynes) with proper bed and side slopes and linking of two pynes will ensure water availability and proper channelling of water. The plantation on bund will protect it from soil erosion. The side slopes were maintained at 1:1.5 to ensure maintenance of natural flow of water including reaching the tail end of the channel. The impact of the re-designed structure will be to reduce soil erosion and runoff, and by ensuring effective water distribution and reduced flood risk. Pigeon pea cultivation on the bund will strengthen the bund and will also act as a guard crop for the main field crop.
The structure is designed to increase storage capacity by approximately 4700 cubic meters, thereby increasing the irrigation potential and scope for crop diversification by at least 10 ha. The excavated silt from the channel sides and bed will be disposed on bunds to strengthen the structure and will also be distributed to the nearby agricultural land which will contribute to enhancing soil organic content and land fertility. Overall, the duration of water availability will be increased by at least a month and this will enable farmers to go for double cropping.