Projects

Below is a sampling of projects demonstrating different elements of our expertise

Multimodal Ferry Terminal at Seattle’s Colman Dock

Mr. Demich is assisting WSDOT Ferries Division – Terminal Engineering with management of design completion and the construction phase design efforts on this $350 million GC/CM project.  The five year project includes replacing the 80+ year old timber trestle portion of Colman Dock, as well as the Terminal Building and portions of the operating structures, as well as constructing and operating a remote holding facility at Pier 46 to the south.  The project is currently being constructed on a Seattle waterfront that has several other major projects ongoing including: the Seattle Seawall; the SR-99 Tunnel; the Viaduct Demolition and the Waterfront Seattle projects.

Disaster Recovery and Planning

Mr. Demich has worked extensively with the Federal Emergency Management Agency (FEMA) over the last seven years, assisting with disaster recovery and planning efforts in Texas after Hurricane Ike, in Louisiana after Hurricanes Katrina, Rita, Gustav and Ike and in New York after Hurricanes Irene and Sandy. He has also worked in disaster recovery in Utah and California. He is well versed in the regulations and policies that govern FEMA’s funding of coastal and upland restoration projects and has recently completed documenting Louisiana’s claim for barrier island restoration.

Effects of Submerged Aquatic Vegetation on Open Channel Flow

It has long been known that vegetation in flowing channels has significant impacts on the flow regime. Invasive aquatic species such as Hydrilla verticillata have become a pervasive and nearly ineradicable part of waterways in the American south. In addition efforts to design flowing wetlands—both as treatment systems and as mitigation for damaged or destroyed natural systems—have been hampered by a lack of pertinent design methods. We conducted basic research designed to investigate the interaction of flow with aquatic vegetation and elected to conduct our studies using live aquatic vegetation. The work involved construction of test channels, both in the laboratory and at near field scale, cultivation of the necessary vegetative stocks and extensive testing under a range of hydraulic regimes. The research resulted in quantitative tools for estimating the impacts of vegetation on flow in irrigation canals.

Washington State Ferries Programmatic Planning Tools

Washington State Ferries (WSF) has fourteen aging timber trestles throughout their system in Puget Sound and the San Juan Islands.  Most of these trestles have been in service for fifty years or more and are nearing or past the end of their effective lifespan.  Although individual Master Plans had been developed for a few of the larger terminals over time, there had been no systematic effort to develop a planning process for WSF Terminals.  Obelus Design Group was tasked with developing tools that could be used to develop such a process.  The three main areas that were focused on were: predicting and modeling vehicle traffic queues; developing operational and architectural programs for ferry terminals and development of suitable design guidelines for passenger holding and handling areas.

Okanogan River Erosion Evaluation

Douglas County PUD#1—anticipating their upcoming relicensing application with the Federal Energy Regulatory Commission—required a methodology for estimating erosion on the shoreline of the Okanogan River.  Mr. Demich developed a practical approach which combined computer-based comparison of historical aerial photographs with data from geological mapping of the area and field review of the affected areas.  We then used this data and methodology to estimate erosion and identify property buy back requirements.  This provided the client with a rational and equitable approach for keeping erosion on their property; Obelus Design Group (ODG) developed the protocols for this work and then performed the analysis and developed recommendations for every tract on both banks of 15 miles of river.

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