Storage Areas | Kleinschmidt

### Lateral Structure Coefficients

Lateral structures can be used in HEC-RAS to transfer flow from a river/reach to a storage area, or to another river/reach.  With the coming release of HEC-RAS with 2D capabilities (estimated beta release January/February 2014), you’ll be able to hook a river/reach to a 2-D area using a lateral structure. Although its primary function in […]

### Filtering Station Elevation Data in HEC-RAS

I am working on a dam breach project where I’m trying to simplify a complicated model with dozens of tributaries and storage areas. In the process, I’m converting a few tributaries into storage areas (which are surrounded by other storage areas). For example, I want to convert the reach below (from 5.43 to 0.55) to […]

This is a great presentation put together by Mr. Steven Piper of the Hydrologic Engineering Center that discusses in detail the use of “Rules” at inline structures.  Dr. Michael Gee forwarded this presentation to me after seeing some discussion on the forum about the use of Rules for inline structures.  Thanks for the suggestion Dr. […]

### Quasi Two-Dimensional Modeling in HEC-RAS

One of the limitations of HEC-RAS is that it is a one-dimensional model. Simply put, RAS assumes all flow moves along a singular dimension. For a given cross section, all of the flow is assumed to move either downstream, or all of it moves upstream, along the singular dimension (which can be defined as a […]

### Dealing with dry bed conditions for Creek/Spillway linked to a Reservoir Storage Area

Our office ran into an unusual modeling situation recently.  Here is a description of the situation:  The project is a dam breach model, and the spillway for the dam diverts water to an adjacent basin.  The spillway is actually more like a canal (the spillway reach) that runs about a mile until it empties into the adjacent […]

### Connecting a River to an Off-channel Storage Area using a Lateral Structure

An off-channel storage area in HEC-RAS can be a very useful way to simulate flooding in interior areas, adjacent ponds and lakes, urban areas next to rivers, green storage, or just about any area that you expect to flood but will be better represented as ponded water versus actively conveying water.  Connecting rivers to off-channel […]