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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Flood risk management and adaptation : Field measurements of the flow pattern in a stormwater retention pond
Field measurements of the flow pattern in a stormwater retention pond
In Canada, stormwater retention ponds are often used to store urban runoff, attenuate peak flows during rain events, and
improve water quality entering receiving waters such as rivers, lakes, and wetlands. In many cases, stormwater retention
ponds are located within residential neighborhoods and serve an additional recreational purpose as public park space.
Water quality is therefore a major concern for residents not only due to negative environmental impacts, but also for
recreational activities and property value. A number of Canadian case studies have assessed the treatment efficiency of
stormwater retention ponds for specific contaminants, often citing negative treatment efficiencies during large rain events
or during certain times of the year. However, few studies have measured the internal flow patterns of the pond which
directly affect the treatment efficiency. This research is aimed at assessing the internal flow patterns of a typical
stormwater retention pond located on the Canadian Prairies in Saskatoon, Saskatchewan during the summer of 2014. To
assess the flow pattern drogues were constructed, which consisted of fins at varying depths and a float. Two methods
were then used to determine the movement of the drogues. The first method involved the use of a camera with an
appropriate resolution and known surveyed coordinates, drawing on concepts from particle tracking velocimetry. The
second method involved securing a prism to one drogue float and tracking the drogue by surveying with a robotic total
station. Unlike in smaller retention ponds, where general circulation patterns are found within the pond depending on the
locations of the inlet(s) and outlet(s), wind speed and direction were the dominant factors influencing internal flow patterns
in the study pond. This research suggests that wind influence on stormwater retention ponds may contribute to flow shortcircuiting
depending on the wind direction, and should be a consideration in design.
File Size : 532,940 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Flood risk management and adaptation
Date Published : 14/08/2015
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