title: Effects of Stormwater Pipe Size and Rainfall on Sediment and Nutrients Delivered to a Coastal Bayou.
abstract: Pollutants discharged from stormwater pipes can cause water quality and ecosystem problems in coastal bayous. A study was conducted to characterize sediment and nutrients discharged by small and large (< 20 cm and >20 cm in internal diameters, respectively) pipes under different rainfall intensities (< 2.54 cm and > 2.54 cm, respectively). Results showed that large pipes had greater discharge than small pipes. Pollutants concentrations did not vary by pipe size. Large pipes had greater loads of TSS (138.2 vs. 24.0 mg/s), NO3(-) (5.54 vs. 2.74 mg/s), and NH4(+) (0.39 vs. 0.19 mg/s) than small pipes. Neither discharge nor constituents varied by rainfall events. Pipe size may be a useful metric for estimating loads to a system. Nutrient reduction efforts should be directed to reducing the dissolved nutrient pools, while stormwater management efforts should be directed to reducing pipe freshwater discharge volumes that drive constituent loads.
authors.affiliation: Aquaculture and Fisheries Center, University of Arkansas-Pine Bluff, AR 71601, USA.
authors.forename: Daniel
authors.initials: D
authors.lastname: Grigas
authors.forename: John
authors.initials: J
authors.lastname: Lehrter
authors.forename: Just
authors.initials: J
authors.lastname: Cebrian
authors.forename: Yushun
authors.initials: Y
authors.lastname: Chen
authors.forename: Brenna
authors.initials: B
authors.lastname: Ehmen
authors.forename: Mark
authors.initials: M
authors.lastname: Woodrey
mesh_terms: D004784:Environmental Monitoring; D008922:Mississippi; D011891:Rain / Q000737:chemistry*; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000032:analysis*; D060753:Water Quality
chemical_list: D014874:Water Pollutants, Chemical