This study will cover rainfall and flood hazard models to develop a sustainable mine site and urban flood risk management system in arid and semi-arid regions. Adaptive flood management under evolving climates is necessary, as extreme rainfall is linked with the rise in the number of tailings dam breaks. This study opts to assess flood trends using a hybrid hydrologic-hydraulic model known as HEC-RAS. This will have now evaluated the feasibility of such sustainable solutions to arid nature as rainwater harvesting, green roofs, and retention ponds with or without greywater recycling. These enable the development of a multilevel high strength decision-making framework based on the flood return period and type of land use component adoption or omission of green infrastructure, and alternative FRM conditions. The use of Green infrastructure alongside water conservation enhances FRM potential, markedly diminishing flood risks and fostering groundwater recharge and sustainable water utilization. Research results are used to create climate-adaptive water management systems in urban and mining environments.