Date of Award

8-2014

Document Type

Thesis

Degree Name

Master of Science (MS)

Legacy Department

Plant and Environmental Science

Advisor

Kirk, Kendall

Committee Member

Privette , Charles

Committee Member

Sawyer , Cal

Abstract

1:Little data exists in the literature for quantification of siphon spillway performance. Proper design of an air regulated siphon spillway requires knowledge of required flow rates and minimum vent size. A set of small siphon spillways were constructed to measure flow rate and required vent size relative to physical characteristics including pipe diameter, length of pipe, and elevation head. Vent sizing was shown to be logarithmically proportional to flow rate. Results were used to develop predictive models for flow rate and vent sizing. Models were validated and refined through testing on a siphon spillway installed on a pond at LaMaster Dairy Farm in Clemson, South Carolina. 2: ABSTRACT A common problem in pond maintenance is reduced functionality of the primary spillway. Many water control structures are nearing the end of their materials' life expectancy. Primary spillways constructed of corrugated metal pipe have a life expectancy of thirty years (Montana DNR, 2012). The objective of this project is to develop a set of design and construction guidelines for pond spillway rehabilitation using a siphon spillway system. This type of water control structure will be useful to landowners as an economical and reliable replacement for vertical riser spillways. To examine the application of the guidelines outlined in this chapter, a failed 40 year old water control structure at LaMaster Dairy Farm on the campus of Clemson University was replaced with a siphon spillway. The existing riser pipe rusted off about 1 m (3 ft). below its normal design elevation, resulting in an estimated loss of 1.5 ha m (16 ac ft) of water at normal elevation. Using a 2 year, 24 hour peak runoff rate from the 47.8 ha (118 ac) pond drainage area, calculations showed an 8-inch siphon would be conservatively sufficient. As a part of the guidelines developed here, Natural Resources Conservation Service (NRCS) specifications and standards are used in curve number estimation, siphon sizing and elevation, runoff calculations and emergency spillway design. Construction procedures are also reviewed in this paper. The guidelines are a tool to show the correct steps in designing and constructing a siphon spillway.

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Hydrology Commons

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