Survey Work For A Length Of 800 Mtr From Ch. 22.50 Km To 21.70 Km At Mouza- Gangapurfacing River Chaltabonia, Ps Block- Patharpratima For Computation Of River Depth Characteristic By Taking Cross Secrion Wbiw/Sdo/Pisdivision/E-Nit- 1 E/2025-26 Sl 1