Designing a hydraulic structure requires knowing how much water is associated with the
design storm (hydrology) and calculating the velocity, depth, and type of flow (hydraulics) that must be accounted for.
Jonathan Rocha, a Waukegan resident, won in the dramaturgy category of his team
Design Storm project of "Arcadia." Dramaturgy is the study of dramatic composition and the representation of the main elements of drama on the stage.
To overcome the potential underestimation of peak flows, Phillips, Lees, and Lynch (1994) proposed the use of an embedded
design storm. This approach embeds the design burst (from ARR 1987) into a historical storm.
Site-specific design parameters include culvert length, slope, headwater, tailwater, and
design storm average recurrence interval (ARI).
Additional to the choice of the IDF equation, it is also essential to decide, based on historical records of precipitation events, the temporal distribution of the
design storm.
Design storms could be represented utilizing diverse distributions.
This design is based on many factors such as the
design storm event ground permeability and total area to be drained from.
The design of the gravity sewer main and the force main are based on results from a hydraulic capacity analysis with an objective of both being able to transport the projected peak
design storm flow.
Thus, a 2-year storm or less is recommended for use as the
design storm for bioretention measures.
Design storm based on precipitation frequency analysis is one of the main procesess for flood estimation as well as a statistical representation of a precipitation event.
In New York City, the 5-year
design storm has an intensity of 5.95 inches per hour (I) based upon a 6-minute time of concentration.
(47) SFWMD uses for its
design storm the 25-year, 72-hour storm and SJRWMD uses the mean annual storm and the 25-year, 24-hour storm.