The tsunami flooding barriers described in the finished project TSUNAMI form large sea reservoirs which may be used for depositing waste from mega-cities, by reducing the waste problems of coastal megacities like New York, Tokyo and Mumbay. By emptying the reservoir, covering its ground by water-impermeable clay layer and thick concrete and by building access roads for garbage trucks, the waste problem of these cities will be solved for years. After garbage and rubble filling and densification, the surface will be flattened by gravel, sand or other fine material and then covered by concrete for industry buildings and factories. Or it will be covered by soil for agriculture. The final result will be reclaiming high-value land.