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An investigation began in 1988 to (1) quantify nutrient, sediment, and freshwater inflow in canals that collect drainage from cropland field ditches, (2) determine the effects of tide gates and flashboard risers on receiving-water quality, and (3) characterize the effects of drainage on the salinity regime of a tidal creek. Data were collected in three agricultural drainage canals in Hyde County, two agricultural drainage canals in Beaufort County, and in Campbell Creek, which receives drainage directly from the Beaufort County canals. Tide gates were tested at selected sites in Hyde County, and flashboard risers were tested at selected sites in Beaufort County. Hydrologic and water-quality data are presented in this report for the period October 1990 through May 1992 and include (1) daily values of accumulated precipitation, (2) monthly water-level statistics, (3) daily mean values of discharge in the canals, (4) biweekly water-quality field measurements and sample analyses, (5) storm-event water-quality measurements and sample analyses, (6) continuous records of specific conductance in the canals, (7) vertical profiles of salinity in Campbell Creek, and (8) daily mean values of salinity in Campbell Creek.

An investigation began in 1988 to (1) quantify nutrient, sediment, and freshwater loadings in canals that collect drainage from cropland field ditches, (2) determine the effects of tide gates and flashboard risers on these loadings and on receiving-water quality, and (3) characterize the effects of drainage on the salinity regime of a tidal creek.Data were collected in three canals in Hyde County, three canals in Beaufort County, and in Campbell Creek, which receives drainage directly from two of the Beaufort County canals. Water-control structures were placed on two of the six canals near the beginning of the investigation.Following about two years of data collection, control structures were placed on the remaining canals.Hydrologic and water-quality data are presented for each of the study sites for the period of May 1988 through September 1990. Data presented in this report cover the first phase of the investigation prior to the installation of water-control structures in four of the six canals. Following a description of the study sites and data-collection methods, data are presented.These data include:(1) daily values of accumulated precipitation,(2) water-level statistics, (3) daily mean values of discharge in the canals, (4) biweekly water-quality measurements and sample analyses,(5) storm-event water-quality measurements and sample analyses, (6) continuous records of specific conductance in the canals, (7) vertical profiles of salinity in Campbell Creek, and (8) daily mean values of salinity at five sites in Campbell Creek.

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