Chemistry of stream water for the Lamprey River Hydrologic Observatory

Stream water is collected at weekly to monthly intervals at several sites within the Lamprey River Hydrologic Observatory (LRHO). These data sets begin in 1999. Stream water grab samples are taken from a well-mixed portion of the stream channel on the routine sampling day (typically Tuesdays). Additional samples are collected during selected storm events. A continuous record of stream discharge is recorded by the United States Geological Survey (USGS 01073500) near the mouth of the Lamprey River and average daily and instantaneous stream discharge data are available. Hourly climate data are available from the NOAA NCDC U.S. Climate Reference Network (USCRN) at a station (NH Durham 2 SSW) in the lower part of the watershed. Field meters are used to determine dissolved oxygen, pH and conductivity in the stream and stream samples are filtered (pre-combusted 0.7 μm Whatman GF/F glass fiber filter) and frozen prior to analysis unless otherwise specified. All analyses were conducted at the Water Quality Analysis Laboratory at the University of New Hampshire.