Category:748 Hydraulics and Drainage: Difference between revisions

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To produce the most practical and flexible design, each hydraulic aspect and the resulting design frequencies must be considered and established based upon the relative risks and costs. The hydraulic frequency establishes a design storm and associated discharge and the criteria establish the acceptable level of performance during that storm. Instead of the simple term “design frequency”, use the terms “backwater design frequency”, “roadway overtopping design frequency”, “freeboard design frequency”, etc. The plans are to show the frequency to which each aspect of the project is designed.
To produce the most practical and flexible design, each hydraulic design aspect and the associated flood frequency must be considered and established based upon the relative risks and costs. The flood ''frequency'' establishes a design storm and associated discharge; EPG 748 ''criteria'' establish the acceptable level of performance for that event. In lieu of a single “design flood frequency”, the flood frequency associated with each hydraulic design aspect will be shown on the plans, i.e., “backwater design frequency”, “roadway design frequency”, “freeboard design frequency”, etc.
 
[[131.1 Design Exception Process|Design exceptions]] for frequency or criteria are encouraged when they are practical.

Latest revision as of 13:30, 9 June 2014

To produce the most practical and flexible design, each hydraulic design aspect and the associated flood frequency must be considered and established based upon the relative risks and costs. The flood frequency establishes a design storm and associated discharge; EPG 748 criteria establish the acceptable level of performance for that event. In lieu of a single “design flood frequency”, the flood frequency associated with each hydraulic design aspect will be shown on the plans, i.e., “backwater design frequency”, “roadway design frequency”, “freeboard design frequency”, etc.

Design exceptions for frequency or criteria are encouraged when they are practical.

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