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This fill had an estimated volume of 8,518 cubic yards and formed a work bench for the minesite . The test chamber itself is 100 feet in diameter and 122 feet high , making a high-vacuum volume of 800,000 cubic feet available . For earthen lot areas , the value of 2,800 cubic feet per acre per year should be used to calculate the amount of manure and silt solids that would come off the lot area . For example , if an Amana countertop model with a ( oven ) capacity of 1.6 cubic feet and cooking power of 1000 watts had been selected by the field economist , this would be designated on the CPI data collection document by selecting the A1 , B1 , D3 , and E2 specification elements - - see last attachment . The discharge measurements made by the USGS during the April 1997 flooding show that the stage varied as much as 6 feet for a discharge of 30,000 cubic feet per second ( cfs ) .