A volumetric gas reservoir reaches its economic limit when the reservoir pressure falls below the level needed to sustain the surface pressure necessary to move the gas through surface facilities and into a pipeline. Compression is considered when economically feasible. Waterflooding of low-pressure gas reservoirs is viable alternative to compression. Waterflooding reserves may in certain cases exceed that of compression. Water displaces gas efficiently because of extremely favorable mobility of low-pressure gas. The incremental recovery depends on the initial reservoir pressure and the pressure at which the waterflooding is implemented. This management option may also be used in conjunction with compression to maintain reservoir pressure, which ensures well unloading, and reduces need for well workover. The economic feasibility of waterflooding depleted gas reservoirs is controlled by the amount of water needed, which is high because of the high gas compressibility. The amount of needed water increases dramatically as the reservoir pressure decreases. Managing this option as a water disposal for the field or nearby fields would be a major additional economic incentive. The injection is not a major cost component, as the water hydraulic head would exceed the reservoir pressure in most cases. The cost of water injection can be eliminated all together by downhole commingling of high pressure large aquifer with the depleted gas reservoir. This option would require special but simple downhole completion. Water volume supplied by the aquifer can be monitored using reservoir pressure and production data. Studies of actual reservoirs demonstrated the technical and economic feasibility of this management option.