Agricultural non-point source (NPS) pollution poses a severe threat to water quality and aquatic ecosystems. In response, tremendous efforts have been directed toward reducing these pollution inputs by implementing agricultural conservation practices. Although conservation practices reduce pollution inputs from individual fields, scaling pollution control benefits up to the watershed level (i.e...

Chloride is a relatively unreactive plant nutrient that has long been used as a biogeochemical tracer but also can be a pollutant causing aquatic biology impacts when concentrations are high, typically from rock salt applications used for deicing roads. Chloride inputs to watersheds are most often from atmospheric deposition, road salt, or agricultural fertilizer, although studies on agricultur...

The Terrain Resources Inventory Mapping (TRIM) data standard in BC, Canada, includes speci cations for river data and elevation data that are typically met by interpretation of stereo orthophotos. It does not specify that breaklines for watersheds be interpreted from the photos, thus we must extract them from the data. We seek a system of watersheds that, while not exact due to errors in the da...

When improperly managed, land application of animal manures can harm the environment; however, limited watershed-scale runoff water quality data are available to research and address this issue. The water quality impacts of conversion to poultry litter fertilization on cultivated and pasture watersheds in the Texas Blackland Prairie were evaluated in this three-year study. Edge-of-field N and P...

Wildfire is an important and prevalent agent of disturbance in vegetated landscapes across much of the Earth’s surface, including forested watersheds in the arid western USA. Between 1992 and 2003, >40% of the watersheds in the upper reaches of the Boise River watershed in central Idaho burned. The purpose of our study was to investigate the legacy effects of wildfire on stream ecosystems by an...

The relocation of the national capital has been carried out by several countries for various reasons. This study aimed to determine characteristics location nation’s city in East Kalimantan Province. research was conducted two regencies, 3 sub-districts, and 4 sub-districts. Penajam Paser Utara District includes Babulu Sepaku Districts, while Kutai Kartanegara Muara Jawa District. data used thi...

Excess nutrients and suspended sediment exports from agricultural watersheds are significant sources of global water quality degradation. An improved understanding surface groundwater pollutant loads is needed to advance practices policies. A study was conducted in an agricultural-forested catchment the mid-Atlantic region United States. Stream (SW) shallow (SGW) samples were collected monthly ...

We study the combinatorial auction problem, in which a set of objects are to be distributed amongst selfish bidders with the goal of maximizing social welfare. We consider mechanisms that apply greedy algorithms, and ask to what extent truthful greedy mechanisms can find approximate solutions to the combinatorial auction problem. We associate the notion of greediness with a broad class of algor...

Abstract Background The impact of watershed land-use on surface water quality is one the under researched areas in mega cities developing countries like Addis Ababa. study examined land uses Kebena river within its seasonal and spatial variation assessed relationship between pollution dominant types sub-watersheds. Method main use sub-watersheds were digitized from aerial photograph 2016, quant...

Rapid changes in land use, pollution inputs, and climate are altering the quantity, timing, form of materials delivered from watersheds to estuaries. To better characterize these alterations simultaneous measurements biogeochemical conditions estuaries over a range times scales needed. We examined strength watershed-estuarine coupling using situ nitrate, terrestrial dissolved organic carbon (DO...