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Multivariate Analysis of Paired Watershed Data to Evaluate Agricultural Best Management Practice Effects on Stream Water Phosphorus

^a Bureau of Water Assessment and Management, New York State Department of Environmental Conservation, 625 Broadway, 4th Floor, Albany, NY 12233-3502
^b Department of Natural Resources, Fernow Hall, Cornell University, Ithaca, NY 14853
^c School of Civil and Environmental Engineering, Hollister Hall, Cornell University, Ithaca, NY 14853-3501

View larger version (27K): [in a new window]   Fig. 1. Map of the Cannonsville Reservoir basin, Delaware County, New York, showing locations of the farm (treatment) and nonfarm (control) study watersheds.

View larger version (132K): [in a new window]   Fig. 2. Maps of (a) farm site and (b) nonfarm control site, showing watershed boundaries, 6-m contour lines, perennial stream channels, and monitoring stations.

View larger version (31K): [in a new window]   Fig. 3. Phosphorus (kg mo–1) in manure spread within the farm watershed for the pre- and post-best management practice (BMP) periods.

View larger version (20K): [in a new window]   Fig. 4. Farm watershed event flow volumes (m3 per event) for the pre- and post-best management practice (BMP) periods. Large circles indicate the eight highest event flow volumes observed during the study period (>40000 m3).

View larger version (26K): [in a new window]   Fig. 5. Event load data for (a) total dissolved phosphorus (TDP) and (b) particulate phosphorus (PP), farm vs. nonfarm watersheds. Lines show results of simple regressions for the pre- and post-best management practice (BMP) periods.

View larger version (39K): [in a new window]   Fig. 6. Statistical power ( = 5%) of univariate, bivariate, and multivariate analyses for winter and summer seasons addressing (a) total dissolved phosphorus (TDP) and (b) particulate phosphorus (PP) event loads. The standard errors f (SE) associated with the coefficient of the treatment index variable k in Eq. [2] for the three TDP winter and summer models equaled 0.123, 0.078, 0.081 and 0.353, 0.182, 0.173, respectively. For the three particulate phosphorus (PP) winter and summer models, the standard errors f were 0.179, 0.148, 0.111 and 0.454, 0.312, 0.239, respectively.