A Geospatial Analysis for Thriving Agricultural Sector at the Koyra Upazila, Khulna, Bangladesh by Identifying Suitable Rainwater Harvesting Structure Site Integrating SCS-CN

Water is one of the most valuable resources on the verge of extinction. The continued depletion of fresh water poses a tremendous threat to humanity. Koyra Upazila in Khulna with flood-susceptible zones, causing unavailability of fresh water. Additionally, the salinity problem in that area is causing the decline in soil fertility, biodiversity loss, and freshwater pollution. This research proposes a GIS-based system that uses data from remote sensing to determine appropriate locations for rainwater gathering structures as a solution. The methodology is developed incorporating the Surface elevation, land use/land cover, soil, drainage, and depression maps, which are examined to determine depression volume and surface runoff availability using the Soil Conservation Service - Curve Number (SCS-CN) approach. The selection suitability will be used to identify potential locations, ultimately helping to develop a sustainable water management system for Koyra. The marginalized community will be able to attain fresh water and sweet water for cultivation. Adding in, the regeneration of Shakbaria Khal will bring a prominent change in the watershed, improving the community living standard and agricultural conditions. The research helps to develop a community that is resilient to disasters caused by climate change by providing a sustainable water management system.