Physical Sciences and Mathematics Commons^™

Improved Estimates Of Tributary Nitrogen Load To Casco Bay, Maine, Whitley J. Gray

Electronic Theses and Dissertations

Over the past two decades, total nitrogen (TN) concentrations have increased in Casco Bay (CBEP 2015). The sources of the increased nitrogen are poorly understood but occur with simultaneous population growth and land use changes. The total riverine nitrogen load to Casco Bay was previously estimated by Liebman and Milstead (2012) using the United States Geologic Survey’s (USGS) SPAtially Referenced Regression On Watershed attributes (SPARROW) model. The SPARROW model uses watershed characteristics, regional monitoring data and nitrogen source data to estimate nitrogen loading but was not validated using measurements of nitrogen in the Casco Bay watershed. This study attempts to …

Constituent Loads And Trends In The Upper Illinois River Watershed And Upper White River Basin: 2015 October Through 2018 September, Erin E. Scott, Brian E. Haggard

Technical Reports

The Arkansas Natural Resources Commission (ANRC) identified two priority hydrologic unit code (HUC) 8 watersheds, the Upper White River Basin (UWRB; HUC 11010001) and the Upper Illinois River Watershed (UIRW; 11110103), in northwest Arkansas. Nonpoint source (NPS) pollution is a concern in these watersheds, such as excess nutrients from agriculture and sediment from changes in land uses. Several NPS pollution projects have been funded by ANRC, including streambank restoration on Sager Creek and best management practices (BMP) to control urban sediment in Fayetteville. The purpose of this project was to collect water samples at 15 sites in the UWRB and …

Moses Lake Algae Monitoring Project 2018 Final Report, Robin A. Matthews, Joan Pickens, Eric J. Lawrence

Moses Lake

Moses Lake is a shallow, hypereutrophic lake in Grant County, Washington (Carroll and Cusimano, 2001), with a surface area of 6,800 acres (27.5 km2 ), total volume of 130,000 acre-ft (160.4 × 106 m3), average depth of 19 ft. (5.8 m), and maximum depth of 38 ft. (11.6 m; Dion, et al., 1976). The lake is situated adjacent to the city of Moses Lake and drains into Crab Creek, a tributary of Columbia River. The lake is a popular recreational destination for fishing, boating, swimming, and camping.

Moses Lake develops nuisance blooms of cyanobacteria during the summer and fall. The …