A drainage system for a fuel cell, comprising: separator means for separating fuel gas and liquid water from a gas-liquid mixture discharged from the fuel cell; storage means for storing the liquid water separated by the gas-liquid separator; drain valve means in fluid communication with the storage means for selectively discharging the liquid water from the storage means; and control means for selectively opening and closing the drain valve means; wherein the storage means comprises a lower portion having a first horizontal cross sectional area and an upper portion having a second horizontal cross sectional area, the first horizontal cross sectional area being smaller than the second horizontal cross sectional area; and wherein the control means is arranged to open and close the drain valve means to maintain a first water level within the upper portion of the storage means when the fuel cell is in an operating state and characterized in that the control means is arranged to maintain a second water level within the lower portion of the storage means when the fuel cell is in a stopped state, and the system further comprising an upper limit level sensor, a lower limit level sensor, and a stopped state level sensor for detecting a water level in the storage means, wherein the control means is arranged to open and close the drain valve means in response to the detected water level, wherein the upper and lower limit level sensors (31, 32) are provided in the upper portion of the storage means, and the stopped state level sensor is provided in the lower portion of the storage means and is disposed at the height of the second water level. separator means for separating fuel gas and liquid water from a gas-liquid mixture discharged from the fuel cell; storage means for storing the liquid water separated by the gas-liquid separator; drain valve means in fluid communication with the storage means for selectively discharging the liquid water from the storage means; and control means for selectively opening and closing the drain valve means; wherein the storage means comprises a lower portion having a first horizontal cross sectional area and an upper portion having a second horizontal cross sectional area, the first horizontal cross sectional area being smaller than the second horizontal cross sectional area; and wherein the control means is arranged to open and close the drain valve means to maintain a first water level within the upper portion of the storage means when the fuel cell is in an operating state and characterized in that the control means is arranged to maintain a second water level within the lower portion of the storage means when the fuel cell is in a stopped state, and the system further comprising an upper limit level sensor, a lower limit level sensor, and a stopped state level sensor for detecting a water level in the storage means, wherein the control means is arranged to open and close the drain valve means in response to the detected water level, wherein the upper and lower limit level sensors (31, 32) are provided in the upper portion of the storage means, and the stopped state level sensor is provided in the lower portion of the storage means and is disposed at the height of the second water level.