Definition: | study city where data is collected | unique site identifier, first digit indicates city, remaining three digits indicate site within that city | synoptic event number (1-4). Note that these are different among cities. 0 for Samples collected outside of synoptic events. | season of synoptic event (spring, summer, fall, winter) | date of sample collection in MM/DD/YYYY format, NA if no water present | location flag; M=sampling location inconsistent with previous sampling events due to accessibility, see notes; C=canal, T=tributary, R=river | upper order watershed of sampling location (order varies by city) | stream or river name | local site identifier | collection time of sample in 24 hr HH:MM format, local time | end of collection time of sample in 24 hr HH:MM format, local time | yes, no, light, drizzle | N=no stormwater influence, Y=influenced by stormwater (i.e., sampled during active high flows), maybe=maybe influence by stormwater | water temperature at time of sample collection | pH of water at sampling site | dissolved oxygen concentration at time of sample collection, in mg O2/L | dissolved oxygen concentration at time of sample collection, in percent saturation | specific conductivity at time of sample collection | conductivity at time of sample collection | barometric pressure at time of sample collection | total dissolved solids in g/L | salinity in parts per thousand | oxidation-reduction potential in milivolts | turbidity at time of sample collection | percent canopy cover at sampling site estimated using a densiometer |