No description available.

5 pp. / Urban run-off is created by rain, snowmelt, or irrigation water flowing across sidewalks, drive ways, roadways, and other surfaces into storm drains. All storm drains empty into rivers or river beds, lakes, streams, washes, and other storage areas often without treatment. The Urban Run-off (Non-point Source Pollution) Tip Sheet will educate the reader on urban run-off and associated water pollution. The tip sheet explains the causes, effects, and sources of non-point source pollution. It also provides information on what can be done to prevent urban run-off and water pollution. It includes both general information as well as information specific to Maricopa County.

No description available.

Call number: LD2668 .T4 1950 L3 / Master of Science

Digitized by Kansas Correctional Industries

Digitized by Kansas Correctional Industries

Digitized by Kansas Correctional Industries

The probable pollution distribution and flushing times have been calculated for the Columbia River Estuary, a coastal plain estuary. The pollution distribution was determined by the fresh water fraction and by the diffusion equation. The flushing times were calculated by the modified tidal prism method and by the fraction of fresh water, These methods are explained and discussed in the study. The widely varying river flow and resulting salt water intrusion were considered, as well as the varying semi-diurnal tidal range. These changing factors cause a complex variation in estuarine classification from well-mixed to stratified. The data used was taken principally from the U. S. Corps of Engineers current measurement program of 1959. The data show a stronger flow on the north side of the estuary during flood tide and a stronger flow on the south side during ebb tide. Due to this fact, the estuary was also treated as two separate channels in calculating the pollution distribution. The results of the various calculations for combinations of conditions are given in this study. A comparison of the different methods is also summarized. The estuary has been found to have a relatively short flushing time, even under low river flow conditions. The variation in strength of flow from the north side to the south side has been shown to produce pollution distributions not normally expected in an estuary. / Graduation date: 1965

A digital computer model was developed to simulate the time and space distribution of a dissolved pollutant in an estuary. The program is basically a one-dimensional finite-difference model, but two dimensions can be represented by attaching together several one-dimensional channels. The influence of convection, dispersion and decay are included in the model. The time scale is based on increments of less than one tidal cycle so that intertidal velocities are represented. A sensitivity analysis was conducted on the convection portion of the model and several tables and graphs are included to indicate the nature and magnitude of numerical errors associated with the model. A method for correcting these errors is also presented. A tracer study was conducted on the Yaquina Estuary, Newport, Oregon and results are compared with two computer model simulations. / Graduation date: 1971

none