Yes, absolutely. The battle for global blue water (surface fresh water in rivers, lakes, etc.)and groundwater rights gets hotter every year. read more
Other streams are"losing streams", which lose water from the streambed out into the ground. Rivers can be gaining and losing at different locations; they can be gaining one time of the year and losing in another time of year. And, as the yellow arrow shows, even a gaining stream will be losing some water, and the other way around. read more