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Title:Determination of Boneyard Creek flow capacity by hydraulic performance graph
Author(s):Yen, Ben Chie; Gonzalez, Juan A.
Contributor(s):University of Illinois at Urbana-Champaign
Subject(s):Water resources center
Water resources center--Illinois
Hydrology and hydraulics
Backwater curve
Boneyard Creek
Channel capacity
Channel flow
Design flow
Flood flow
Hydraulic capacity
Hydraulic performance graph
Open channels
Rating curves
Storm drainage
Storm runoff
Urban drainage
Urban hydrology
Geographic Coverage:Illinois (state)
Abstract:The Boneyard Creek in Champaign-Urbana, Illinois has caused flooding problems in the twin cities for years. Like most drainage problems, it is desirable to know the flow carrying capacity of some or all of the channels in a drainage system accounting for the interacting backwater effects among the channel reaches, not merely the steady uniform discharge of the individual reaches. A hydraulic performance graph method is developed for this purpose. The hydraulic performance graph is a summary of the behavior of the steady-nonuniform flow profiles in a backwater-affected channel reach. A set of the hydraulic performance graphs for individual reaches in a channel system, supplemented by the rating curves of the closed-conduit reaches for the flow range under surcharged conditions, can be used together to determine the capacity of the drainage channel system corresponding to a specified exit tail water level. The method is applied to the portion of the Boneyard Creek flowing through the north campus of the University of Illinois, between Wright Street and Lincoln Avenue in Urbana. The maximum capacity of this portion of the Boneyard Creek is defined as the discharge in the individual reaches corresponding to the condition that the exit flow depth at Lincoln Avenue is equal to the critical depth of the flow while no overbank spill occurs anywhere within the channel system. This discharge is constant in all the system if there is no lateral flow from sewers joining the channel; but it decreases towards upstream by the amount of the lateral flow from sewers draining the local runoff into the creek. Since critical flow depth rarely occurs at the Lincoln Avenue exit, channel system capacity can also be determined for a specified tailwater level. The results show that the major bottlenecks causing flooding in the campus portion of the creek are the Gregory Avenue bridge and the Mathews Avenue bridge. Furthermore, the absolute maximum capacity for individual reaches, which correspond to critical depth at the downstream end of the reach, as well as their maximum uniform capacity are also determined by using the hydraulic performance graph of the individual reaches.
Issue Date:1994-12
Publisher:University of Illinois at Urbana-Champaign. Water Resources Center
Genre:Report (Grant or Annual)
Sponsor:U.S. Department of the Interior
U.S. Geological Survey
Rights Information:Copyright 1994 held by Yen, Ben Chie, Gonzalez, Juan A.
Date Available in IDEALS:2016-05-18

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