Uses and Limitations of Conventional Hydraulic Models in the Planning and Design of Storage Tunnels

by Peter von Zweck,
Perrin Niemann,
Tim Coleman,



Document Type: Proceeding Paper

Part of: Pipelines 2002: Beneath Our Feet: Challenges and Solutions

Abstract:

The hydraulic design of storage tunnels requires special considerations relative to the design of conventional sewers. These issues include characterization and control of inflows, energy dissipation and deaeration at drop shafts, rapid filling, transitions from free-surface to surcharged conditions, ventilation of displaced air, deposition of solids and scouring, and odor control. Conventional hydraulic models can play a significant role toward meeting the planning and design requirements related to many of these issues. For planning and design of CSO control projects in Cleveland, Providence, Fall River, and Portland, conventional model sewer used to simulate the hydrologic and hydraulic properties of wastewater collection systems and their potential flow contributions to tunneled storage facilities. These CSO programs included a variety of tunnel configurations, on-line and off-line storage, and multiple flow control strategies. Conventional hydraulic models were used to directly simulate collection system performance for design events, for extended period simulations, and for the evaluation of scouring of deposited solids in the tunnels. Output from these models was also used as input to other more detailed evaluations of tunnel system hydraulic characteristics, including: sizing of drop shafts, evaluation of rapid filling and the potential for transient pressures, design of emergency overflow structures, and ventilation of displaced air. This array of simulations proved to be an important part of the overall design process for these programs.

Subject Headings: Hydraulic models | Hydraulic design | Tunnels | Water storage | Waste storage | Combined sewers | Ventilation

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