Small commercial and non-commercial animal enterprises (SCAEs) raise a few
beef cows, horses, pigs, sheep, poultry, and other animals on a few acres. These
enterprises are often located in suburban areas of watersheds and show potential for
degrading water quality through to increased bacterial, nitrogen, and phosphorus
concentrations. SCAEs implement...
Environmental and regulatory concerns are causing confined animal feeding operations (CAFO's) to account for phosphorous content when applying wastewater to agricultural fields for disposal. In most cases this requires more land to spread the waste onto so that the phosphorous needs of the crop are not exceeded. A mobile process...
The overall goal of this study was to determine if the Tillamook Bay tributaries'
water quality has improved as a result of the Best Management Practices (BMP) installed
at Tillamook County Dairies.
The Rural Clean Water Program (RCWP) was a 10 to 15 year experiment designed to
control agricultural non-point...
Reach defined analysis concentrated on the water temperature change that occurred in a stream/river segment over the course of one full diurnal cycle. Digital thermistors, data loggers and computer model development were utilized in reach analysis to link parameters of the stream system to a specific temperature change. The methodology...
Grazing cattle usually have access to streams as a
source of drinking water. A model was developed for the
personal computer to predict the bacterial quality of
these streams. The model estimates the number of
organisms that enter the stream by the direct deposit of
feces and by runoff from...
The rotating flighted cylinder (RFC) was investigated
as a potential wastewater treatment deVice. A RFC is a
rigid tube with a helically-wound fin attached to the interior
surface and operates by flowing wastewater through
the tube as it rotates.
An 8-inch and 24-inch
diameter RFC was tested for
solids-liquid
separation,...
A conceptual model was developed to further the understanding
of the evolution and fate of volatilized ammonia in
the atmosphere. Recent trends in livestock rearing have
been toward confinement facilities in which high animal concentrations
are maintained. One of the impacts of these
facilities has been increased local concentrations of...
Field studies indicate that accumulation of finely divided organic
debris in the channels of mountain streams after clearcutting may be
responsible for subsequent reduction in the dissolved oxygen concentration.
The purpose of this study was to quantify the biochemical
oxygen demand (BOD) of Douglas-fir needles and twigs, western
hemlock needles...