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2. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4422616/
3. https://water.usgs.gov/nawqa/
4. https://water.usgs.gov/nawqa/sparrow/
5. Guide to hydrological practise, management of water resources and application of hydrological practise: World Meteorological Organizaion (Weather-Climate-Water), WMO-No. 168, 6th edn. (2009)