Engineering Commons^™

Calibration Of A Temperature-Radiation Evapotranspiration Equation For Utah, Payam Foroughi

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Two reference crop evapotranspiration (ETr) equations were calibrated to the reference crop of alfalfa using 45 meteorological datafiles from 13 scattered sites in Utah and four sites in the neigboring states of Idaho and Wyoming.

The calibrations were done against the Kimberly version of the Penman ETr formula. The first equation required measured inputs of mean air temperature and solar radiation. It was referred to as the Temperature- Radiation ETr equation (ETr= CT x T x Rs). The second equation required measured inputs of mean minimum and mean maximum air temperatures. It was referred to as the New Hargreaves equation …

Cavitation Limits And The Effect Of Aeration On Cone Valves, Bart "L" Mumford

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Cavitation in cone valves can cause eventual valve failure. However, little data are available on cavitation limits for solid plug cone valves. Flow conditions were identified for a 6 inch cone valve where incipient, critical, incipient damage, and choking cavitation limits occurred at valve openings between 20 and 70 degrees. A description of how these limits are used to predict cavitation intensity is given. Air was used to reduce the damage levels. Aeration increased the allowable pressure drop for damage free operation 6 to 72 percent for valve openings less than 70 degrees. A chart is given for predicting when …

Slow Rate Sand Filtration With And Without Clinoptilolite: A Comparison Of Water Quality And Filtration Economics, Gordon P. Foreman

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Slow rate sand filtration (SSF) amended with a 20 cm surface layer of clinoptilolite, a natural zeolite, was compared to SSF with no amendment in a field scale SSF facility treating 85 m³/d of water. Parameters examined included turbidity, coliforms, and ammonium removal. The control filter with sand and the experimental filter amended with the zeolite were also compared with respect to duration of filter cycle, cold weather operation, and economics.

Amended and unamended filters were approximately equivalent with respect to ammonium and coliform removal at 10° C. The zeolite amended cell was superior to the unamended cell …