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Trends in Water Quality in LEASEQ Rivers and Streams (Northwestern Ohio), 1975–1995

Water Quality Laboratory, Heidelberg College, 310 E. Market Street, Tiffin, OH 44883

View larger version (38K): [in a new window]   Fig. 1. Scatterplots of flow-adjusted log-concentration of total suspended solids and soluble reactive phosphorus, showing the relationship between the Sandusky River data, the predicted values from the analysis of covariance (ANCOVA) model, and the long-term linear trend.

View larger version (22K): [in a new window]   Fig. 2. LOWESS smooth of flow for the period of record. For each river, flow is expressed as a percentage of the mean flow for the period of record, in order to fit all of the graphs on the same axes.

View larger version (20K): [in a new window]   Fig. 3. LOWESS smooth of total suspended solids for the period of record.

View larger version (21K): [in a new window]   Fig. 4. LOWESS smooth of total phosphorus for the period of record.

View larger version (22K): [in a new window]   Fig. 5. LOWESS smooth of soluble reactive phosphorus for the period of record.

View larger version (21K): [in a new window]   Fig. 6. LOWESS smooth of nitrate for the period of record.

View larger version (22K): [in a new window]   Fig. 7. LOWESS smooth of total Kjeldahl nitrogen for the period of record.

View larger version (21K): [in a new window]   Fig. 8. LOWESS smooth of total nitrogen for the period of record. Total nitrogen was calculated as the sum of nitrate and total Kjeldahl nitrogen.