For the upstream/downstream study, a one-tailed, paired two-sample t-test was used to assess for significant change in eachparameter analyzed. Results of the t-test were considered sig-nificant when p < 0.05. A two tailed, unpaired t-test was used tocompare flow velocity of water upstream and downstream of thefacility, and was considered to be significant if p < 0.05.
In an attempt to further understand the influence of flow veloc-ity through the facility on change in parameter concentration,linear regressions were used. The difference from upstream todownstream of each parameter that had a statistically significantchange was compared against the flow velocity of water throughthe facility, and a coefficient of determination (R2) was calculated.Regressions were also used to assess for a potential relationshipbetween upstream Chl-a concentration and the change in concen-tration of Chl-a from upstream to downstream. Change in TANconcentration was also compared against the upstream concen-tration of Chl-a.
All statistical analyses were completed using StatPlus software(AnalystSoft Inc., Alexandria, VA).