Bragg Creek Water Quality Monitoring

The Bragg Creek Water Quality Monitoring Collective group (comprising 44 volunteer citizen scientists) collected grab samples along Bragg Creek from 2005 to 2019. Each sampling period covered the first “weekend” of the month (Friday through Monday). Six sites were monitored five times per year (May through September). The resulting dataset provides baseline conditions for the temporal and spatial variations in gradients of water quality in Bragg Creek, measured in six water quality traits and stream level, and is sufficiently long for among-year trends to emerge. With each passing year, the additional data allow for a more robust statistical analysis of water quality changes. This is the equipment used for monitoring: Meters currently in use (2020): -Hach 2100P Turbidometer (0-9 NTUs (±2%)) -Hach Pocket Colorimeter II (Nitrate; Cadmium Reduction Method, 0.4-30 mg/L) -Hach Pocket Colorimeter II (Phosphorus; Reactive (Orthophosphate); Ascorbic Acid Method, 0.2-3.0 mg/L) -Hanna HI 96753C Chloride Meter (0-20 mg/L (±6% of reading @ 25°C)) -Hanna HI 9033 Conductivity Meter (0-1999 (±1%))布拉格溪水质监测协作组（由44名志愿公民科学家组成）于2005年至2019年间沿布拉格溪采集瞬时水样（grab samples）。每次采样时段均覆盖每月首个“周末”（周五至周一）。该数据集共设置6个监测点位，每年5月至9月间开展5次采样。 本数据集为布拉格溪水质梯度的时空变化提供了基准状况，共记录6项水质指标与溪流水位数据，且采样周期跨度足够长，足以显现年度间的变化趋势。随着逐年积累的新增数据，可对水质变化开展更为稳健的统计分析。 本次监测采用的2020年在用设备如下： - 哈希（Hach）2100P型浊度仪（Turbidometer）：测量范围0~9 NTU，误差±2% - 哈希（Hach）Pocket Colorimeter II型便携比色计（用于硝酸盐检测，采用镉还原法）：测量范围0.4~30 mg/L - 哈希（Hach）Pocket Colorimeter II型便携比色计（用于反应磷/正磷酸盐检测，采用抗坏血酸法）：测量范围0.2~3.0 mg/L - 哈纳（Hanna）HI 96753C型氯离子检测仪（Chloride Meter）：测量范围0~20 mg/L（25℃下误差为读数的±6%） - 哈纳（Hanna）HI 9033型电导率仪（Conductivity Meter）：测量范围0~1999，误差±1%