The steady flow data ( Steady Flow Data (Table 5)) is then entered followed by the data for at least one set of boundary condition. The user then inputs design details of any structures in the watercourse ( Culverts and Bridges (Table 2), Weirs (Table 3), Gated Spillways (Table 4)). Various tools are included in the program to facilitate inputting the geometric data ( Geometric Data (Table 1)) including cross section interpolation, GIS/CADD file importing and graphical and tabular editors. A watercourse is represented by a series of cross sections. Input data is entered through a series of input tables/windows. Critical Depth: The depth in a channel for which the specific energy is a minimum. Supercritical: A flow condition where the velocity is less than the critical velocity and the depth is less than the critical depth. Subcritical: A flow condition where the velocity is less than the critical velocity and the depth is greater than the critical depth. Flow Definitions Steady: A flow condition for which the flow rate at a given point remains constant with time.

With extensive input data manipulation tools and output options, HEC-RAS is an appropriate design and/or analysis tool. The program includes an option for estimating scour at bridges for design. Levees, blocked obstructions, lids and ineffective flow areas can also be modelled as can ice jam and debris flow conditions. Flow through culverts, bridges, weirs and gated spillways is accommodated. The program is capable of modelling complicated networks with multiple reaches and tributaries. The application will estimate water surface elevation and related output along a channel reach under subcritical, supercritical ormixed flow regimes. HEC-RAS is a hydraulic modelling application developed by the US Army Corps of Engineers to simulate water surface profiles for steady and gradually varied flow in open channel watercourses.

Minimum Requirements for inclusion in report.

Use in MTO Drainage Management Practices:

A summary of the evaluation results and the requirements for using this software for MTO design, analysis or approvals is provided. The package was run through various tests for comparison with MTO drainage management practices provided by the MTO Drainage Management Manual (1997). A summary of out results and the requirements for using this software for MTO design, analysis or approvals is provided.The following sections outline the input requirements, computational methods and output options available with this software. The following sections outline the input requirements, computational methods and output options available with this software. Evaluation of Drainage Management Software

Run a flt file on hec ras