One concern of the tunnel system is the potential for hydraulic transients during the
tunnel filling process. Under some conditions, strong storm inflow to a tunnel may generate
severe hydraulic surge in the tunnel, and consequently water may shoot up from the dropshaft
like a geyser, which may result in structural damage to surface facilities and other environmental
problems. For example, in Minneapolis, USA, a severe storm in 1997 caused a geyser 17 m
above the ground from the storm water tunnel.
The purpose of this study is to examine the possibility of any geysering and other
hydraulic transient problems during the tunnel filling process based on the proposed tunnel
configuration design and inflow under different tunnel operating conditions using our wellestablished
hydraulic transient computer simulation model (MXTRANS).
He, Jianming; Song, Charles C. S..
Hydraulic Transient Study of Narragansett Bay Commission CSO Storage Tunnel.
St. Anthony Falls Laboratory.
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