Browsing by Author "Erickson, Benjamin"
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Item Hydraulic Model Study of the Blue River Dam Power Plant, Penstock, and Outlet Works(St. Anthony Falls Laboratory, 1994-07) Voigt, Richard L.; Erickson, Benjamin; Ellis, Christopher R.The Stone and Webster Engineering Corporation (S&W) contracted with St. Anthony Falls Hydraulic Laboratory (SAFHL) to construct and test a physical hydraulic model of a modified stilling basin for the Blue River Dam Power Plant Project outlet works. This project was designed by Stone and Webster for the Eugene Water and Electric Board. Modification to the stilling basin was necessary to accommodate changes in the design of the outlet structure necessitated by the installation of hydroelectric power generating turbines. The basin is presently owned and operated as a flood control structure by the U.S. Army Corps of Engineers (COE). The facility is operated according to COE procedures within the general constraints of a reservoir water surface level of maximum 1357 ft MSL and minimum 1180 ft MSL, and between the minimum and maximum flows of 50 cis to 8400 cfs, respectively. Flow exiting the reservoir is controlled through gates located at the upstream end of a 2000 it long 18.5 diameter conduit. The downstream end of the conduit concludes in an open channel outfall into the existing stilling basin. The design scheme for the hydro facility involved modifying the outlet works to incorporate a multiple bay gated outlet structure and a bifurcation leading to the powerhouse. Modifications included pressurization of the penstock and outlet works necessitated by the combined usage of the flow conduit for both hydropower and flood discharge. The objective of the study was to perform comparative testing of the existing outlet works stilling basin and the proposed design. In this effort, the study evolved into five distinct phases of testing. The test results are summarized according to phases with the reason for and objectives of the next phase outlined in the conclusion of each existing phase. A summary of the various phases is as follows:Item Hydraulic Modeling and Testing of Minneapolis and Metro WWTP East Influent Meter Improvements(St. Anthony Falls Laboratory, 2002-06) Thene, John R.; Voigt, Richard L.; Erickson, Benjamin1.1 Main Model Test Results: Minneapolis There were no problems found with the Minneapolis flow meter configuration. The meters operated as expected in the model and returned flow readings in close agreement with the measurements. 1.2 Main Model Test Results: Metro Plant The model of the Metro Plant flow meter configuration reproduced similar variations (errors) in meter output as were observed in the prototype. It was found that the probable cause of the variations was an air pocket that formed in the crown of the pipe just downstream of the meter. The meters are located just downstream of an aerated grit tank which is a source of entrained air in the wastewater stream. A second source of air is the entrainment that occurs as the grit channel effluent cascades over the effluent weir. These two sources of entrained air, would provide a continuous flow of air to the meter conduit. Bubbles reaching the roof would collect to form an air cavity. Interrupting the continuous accumulation of air, large volumes of air would periodically "burp" from the upstream end of the meter conduit; this was observed in the prototype and reproduced in the model. Such burping would change the flow area and velocity profile at the metering section as the air passed. However, the errors in meter output are believed to be more a result of the air pocket and its effect on the velocity profile, rather than the result of the intermittent burping. Small taps were installed in the crown of the model conduit and used to determine the location of the trapped air. Two vent stacks were installed in the model to release air and prevent formation of the air pocket. Meter accuracy was improved significantly with the vents in place, and the meters were shown to accurately represent the measured flow rate, even with air added to the flow. Thus venting is recommended as a necessary improvement.Item Hydraulic Testing of Roof Drains for use on Flat Roofs(1996-08) Voigt, Richard L. Jr.; Erickson, BenjaminItem Physical Model Study Evaluation of Bee Tree Dam Spillway, Buncombe County, NC(2000-09) Voigt, Richard L. Jr.; Erickson, BenjaminItem Velocity, Rapid Drawdown and Wave Testing of Prototype Anchor Vertica Units(St. Anthony Falls Laboratory, 1995-05) Voigt, Richard L. Jr.; Erickson, Benjamin; Morgan, ScottThe St. Anthony Falls Hydraulic Laboratory (SAFHL) was contracted by Anchor Wall Systems, Inc. to perform hydraulic testing of its Anchor Vertica units. The testing was performed during March and April of 1995 in SAFHL's largest flume, measuring 6 ft high x 9 ft wide x 253 ft long, with a maximum discharge capacity of 300 ft^3/s. The tests were undertaken to evaluate Vertica block performance when subjected to conditions which may be encountered in channel and shoreline applications. This report describes the test procedures and technical data obtained during the testing of the Vertica units. As such this report provides background for a video produced by Promotovision entitled "Anchor Keeps the Water Away." Two different test walls were constructed to evaluate three potential mechanisms which could lead to possible failure. 1. Wall performance when subjected to high velocity water flowing past a channel wall entrance and passing along a channel side wall. 2. The effects of rapid drawdown on a wall under saturated backfill conditions. 3. The effects of repeated wave impact on wall performance