Urban cities rely on reservoirs, lakes, and groundwater supplies for their household and industrial water needs. A reservoir is the most significant water body that meets the current water demand in cities. The population of cities is growing fast as a result of urbanization, which raises the daily water consumption demand. Sedimentation is the deposition of silt or sand particles caused by a stream's or river's water flowing slower or becoming stagnant because of an obstacle like a dam, weir, or barrage. The reservoir's capacity for gross storage (dead and live) is being decreased by sediment deposition. Reservoirs had some original storage capacity when first impounded, but that capacity will be reduced over time owing to sedimentation. The spatial approach is widely used to estimate a reduction in live storage (also known as useful storage) capacity. Sedimentation may be assessed, which helps to determine the reservoir's current water storage capacity. In the present study, spatial approach has been used to find out the water spread area, and then reservoir storage capacity has been calculated. A comparison of the original and revised elevation capacity curves has been established. A study proves that the Navegaon Khairi reservoir has lost 20% of its live storage capacity during its 44 years of operation. There has been no impact on the water supply to Nagpur city, as the Totladoh reservoir has been supplying water to the Navegaon Khairi reservoir as and when required. Based on the water availability in the reservoir, future planning can be made to supply the city's water demand.