Will global warming raise water levels in rivers ?
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Some places will get more rain, so the rivers flowing from there will run deeper, while other places will get less rain, thus rivers flowing from there will run more shallow.
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Climate change is likely to have an effect on water levels at most parts of the hydrological cycle. The forecast changes to precipitation within Europe show a high degree of spatial variability, between the northern part (increase of up to 40%) and the southern part (decrease of up to 20%).. Projections for the end of the 21st century indicate that sea level rise (SLR) may be have up to an additional 0.59 m on top of the 1980-2000 level. So sea levels are very much likely to rise. These will in turn affect the tidal zones of the rivers and estuaries - the areas at the mouth of the river that are affected by the rising and falling tide. Thus, where the rivers are not tidally affected, the changes to sea level will not directly affect the level of the water upstream. One indirect change may be the fact that because there is more water at the end of the river, the flow rates may reduce, meaning that the speed that the water in the river can empty out into the sea may reduce. This would mean that the flood plains of the river are likely to grow to accommodate for the water backlog.
Where the rivers are not tidally affected, the flow rates will be affected by the local precipitation levels, catchment areas, the land-use and the amount of water being used for human requirements such as irrigation.
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