Title page for ETD etd-06112009-063741
|Type of Document
||Agbenowosi, Newland Komia
||GIS based optimal design of sewer networks and pump stations
||Master of Science
|Loganathan, G. V.
|Greene, Richard G.
|Kibler, David F.
- water flow
- least cost path
|Date of Defense
In the planning and design of sewer networks, most of the decisions are
spatially dependent because of the right of way considerations and the desire to
have flow by gravity. This research addresses the application of combined
optimization-geographic information system (GIS) technology in the design
process. The program developed for the design uses selected manhole locations to
generate the candidate potential sewer networks. The design area is delineated
into subwatersheds for determining the locations for lift stations when gravity flow
is not possible. Flows from upstream subwatersheds are transported to the
downstream subwatersheds via a force main.
The path and destination of each force main in the system is determined by
applying the Dijkstra's shortest path algorithm to select the least cost path from a
set of potential paths. This method seeks to minimize the total dynamic head. A
modified length is used to represent the length of each link or force main segment.
The modified length is the physical length of the link (representing the friction
loss) plus an equivalent length (representing the static head). The least cost path
for the force main is the path with the least total modified length.
The design approach is applied to two areas in the town of Blacksburg,
Virginia. The resulting network and the force main paths are discussed.
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