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This was decided by choosing the sites that had the value closest to the mean for that particular environmental variable for that end group. In a few instances, for logistical reasons (proximity/access), the sites that had the second closest value to the mean for the environmental parameter variable were chosen. Using this process, ten field sites were selected to encompass a wide range of environments, varying in their: (1) Climate �� mean annual precipitation totals of 450 to 1400?mm and mean annual temperatures ranging from 8.42 to 11.33?��C, (2) Geology �� varying from catchments with almost 100% hard igneous rocks to catchments with almost 100% clay or sandstone, and (3) Topography �� altitudes at the river's source varying from 128 to 1216?m above sea level. The stream and river sites also see more vary in their morphometry with widths ranging from 0.60 to 50?m and depths ranging from 0.08 to 1.90?m (mean of 3 seasonal measurements). As such the findings and model developed from this study will be applicable to a wide range of streams and rivers located Angiogenesis inhibitor in mid-latitude zones. The approximate location of each site can be seen in Fig.?1, which also describes the range of environmental characteristics of each site. Each field site was instrumented with a multi-parameter water quality probe (Aquaread Aquaprobe) and logger (Aquaread Aqualogger), which recorded turbidity �� a surrogate measure of SS; every 15?min. These turbidity data were converted to estimated SS concentrations using site-specific turbidity-SS regression equations derived from: (1) SS data measured through laboratory analysis of water samples that were collected from the sites on a 4�C8-week temporal frequency, between May 2011 and May 2013. Water samples were collected manually in 1?L plastic bottles in a depth- and width-integrating manner across each river site. Samples were refrigerated at CHIR 99021 filter paper (Whatman GFF), with a pore size of 0.70?��m. The filters and their residue were then dried at 105?��C for 60?min and re-weighed. Following this the filters and their residue were ignited in a muffle furnace at 550?��C for 30?min and then re-weighed to determine VOM (VOM equal to the dried particle mass minus the combusted particle mass). This is the standard technique for the determination of VOM ( APHA, 1995?and?APHA, 1998). The best-fitting regression equations for all of the sites are shown in Fig.?2.