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Station 23 is irrigation return flow in a ditch and has <br />exactly the same hydrograph pattern as station 19, a groundwater <br />well on the floodplain. The similarity of their water level <br />patterns indicates that they are controlled by the same water <br />sources, irrigation and groundwater from the hills to the south. <br />The lowest level reached by water levels at station 19 are <br />similar to those of the Gunnison River, indicating that the base <br />level water table in floodplain gravels is controlled by the <br />Gunnison River and water tables cannot drop below the level of <br />the River. However, water tables can be higher, and water tables <br />need not be of Gunnison River water. Station 23 is an incised <br />ditch that enters the Gunnison River far downstream from staff <br />gauge 7, thus its elevation and base level is lower than the <br />river at 7. <br />16 <br />