None declared. Part of this work was performed when the lead author (I.S.) was involved with the Indian Ocean Climate Initiative, a program that was jointly supported by CSIRO, the Bureau of Meteorology and the Government of Western Australia. The authors would also like to acknowledge the supportive role played E7080 purchase by the late Brian Sadler as chairman of IOCI. “
“Drever (1997) listed five major influences on the chemistry of natural waters including:

climate, lithology, relief, rock/water interaction, and vegetation. Rock/water interaction, influenced by the proportions of runoff (overland flow) to baseflow is an important factor in the variation documented within individual hydrologic systems (Inamdar et al., 2013).

Perturbations of natural hydrologic systems are common and numerous examples of anthropogenic factors, both intra- and extra-basinal, resulting in a strong impact on river water chemistry have been documented in the literature (e.g. Rothwell et al., 2007 and Sanchez Espana et al., 2005). Here we investigate water chemistry during both stormflow and baseflow at seventeen localities in the acidified (Jenkins et al., 2007), but largely undeveloped (Jenkins and Keal, 2004), Raquette River drainage basin within the Adirondack Region. Previous work (Chiarenzelli et al., 2012) has demonstrated that during near average discharge volumes water chemistry is distinct in stretches of the river underlain by three different bedrock terranes (Adirondack Highlands, Adirondack Lowlands, and St. Lawrence River Valley), www.selleckchem.com/erk.html which vary widely in their chemical composition and capacity to buffer acidity. Our primary goal is to characterize and compare the water composition down the length of the river during conditions of high and low discharge approximating

end member compositions. Second, we discuss the factors that exert primary Obeticholic Acid ic50 control on the variation in water chemistry within the drainage basin. Third, we present evidence for the unanticipated episodic impact of a dolostone quarry on river water chemistry in the lower reaches of the river. The Raquette River originates in the Central Adirondack Region near Raquette Lake, New York and has a drainage basin of 2900 km2. It flows north approximately 280 km and drops more than 457 m in elevation to its confluence with the St. Lawrence River near Massena (Fig. 1). During most of its length it flows within the Adirondack Park, a sparsely populated region of private and public lands with limited and highly regulated development, extensive forest cover, and limited agricultural use (Jenkins and Keal, 2004). A system of dams, some built more than a century ago, were used to raise water levels in pre-existing lakes (e.g. Raquette, Forked, Long, and Tupper lakes) and to facilitate spring logging runs. Large reservoirs (e.g.