Drones, also known as Unmanned Aerial vehicles(UAVs), are increasingly used in various applications, including agriculture, construction and infrastructure, environmental conservation, water resources management(WRM) etc. Multiple drones are interconnected with each other as UAV swarms. These UAV swarms offer a versatile and cost-effective tool for WRM. This paper proposes the multi-drone network for WRM known as HydroDrone. The purpose of HydroDrone is to provide valuable data and insights to support decision making and improve the resilience of water supply systems on the verge of ever-changing environmental conditions. In addition, we discussed task allocation to individual drones within the swarm. HydroDrone schedules and balances the task load for water resource management. We also introduced security to multi-drone communication with the base and core stations by incorporating blockchain technology due to its decentralized nature.