Sampling Methodologies

At all stations, temperature and dissolved oxygen were recorded at one metre intervals of depth with an electronic sensing device (Yellow Springs Instruments model #58). At each station, composite samples of the euphotic zone (the lower depth determined as 2½ times the Secchi disc visibility, but not deeper than one metre above bottom at the shallower stations) were collected and sampled for nutrients (mainly inorganic and total forms of nitrogen, phosphorus and silica), chlorophyll a and phytoplankton. Additional samples for nutrients and some metals were collected at 1, 5, 10 and 15 metres above bottom at the deep stations. Sampling of the Holland River stations was done in mid-channel with a weighted narrow-mouthed bottle allowed to fill evenly over a depth interval of 0-1 metre.

Water Quality Targets
Parameters
Sampling Methodologies
Sampling Locations and Data Download