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HEC-RAS version 5.0.3 includes several boundary condition types for 2D flow areas. Flow and stage hydrographs are typically used to input flows to the 2D area. The rating curve and normal depth boundary conditions are available where flow is leaving the 2D area. There is also a precipitation boundary condition, which can be used to apply time series of rainfall excesses to the 2D elements. This article focuses on the flow hydrograph boundary condition.

A flow hydrograph boundary condition is created by: (1) drawing a boundary condition line along the edge of the 2D area, (2)...

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Tags2-D Modeling,

Fort Hood has numerous drainage and erosion issues throughout the Army Installation. The Fort Hood Main Cantonment Drainage Master Plan was the third in a series of masterplanning efforts to identify drainage issues and propose alternatives in different areas of Fort Hood. The three masterplanning projects combined cover the entire army installation including North Fort Hood, West Fort Hood and the Main Cantonment.

Each study followed the same steps to develop the Stormwater Capital Improvement Program. The first step was a massive data inventory using survey grade information of...

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Tags2-D Modeling, stormwater planning,

Freese and Nichols is now part of a new InfoWorks Texas User Group (IWTXUG) comprised of other firms and municipalities. The group has developed a website with goals to facilitate:

  • More coordinated discussions with Innovyze
  • Provide links to discussion groups for dealing with modeling issues
  • Identifying training needs and scheduling training
  • Other purposes as they may arise

Thus far, the group has met with Innovyze representatives to discuss the new ICM software, customer support issues, and feature...

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Tags2-D Modeling,

For more information, contact Kelly Dillard.

Obtaining public input and buy-in is often a critical component of stormwater management design projects, and effectively demonstrating the need for and potential effects of a proposed project is crucial to successfully communicating with the general public and keeping a project on track. Visual illustrations often prove to be the most valuable and efficient means of demonstrating a project’s effects to the public, and the introduction of dynamic stormwater modeling software presents...

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TagsPublic Involvement, 2-D Modeling,

How Does It Work?
Generally, a 1-D hydraulic engine is used to model flow through storm sewers or channels, and the 2-D hydraulic engine is used to model the overland flow that occurs when the drainage system capacity is exceeded. However, the results from a 2-D model are only as good as the data used to build the surface model. So, the first requirement for 2-D modeling is an accurate surface model that represents the ground surface. If possible, the surface model should be built with breaklines that represent physical features such as curbs, walls, or changes in...

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TagsHydraulic Modeling, 2-D Modeling,