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Storm and Sanitary Design Tutorial: SSA Stormwater Control Structures

Stormwater Control Structures

Product:  Autodesk SSA  |   Subject: Storm and Sanitary Analysis

In this exercise, we will learn about stormwater control structures.

Introduction Control Structures

For the storm pond design, we are required to detain the 100-year flow, in such a way that the post development off-site flow is equal or less than the existing conditions (pre-development). This is the main reason we have used the control structure at the end of the pond. With the orifice, we can throttle the peak flow to acceptable levels.  In the case of extreme conditions, such as rains exceeding the 100-year probability, we have the weir and the grate at the top of the structure to carry the excess flows.

A control structure is an essential element in stormwater management. As a reference, here are some examples of control structures used in different parts of the world.

Typical control structure: Central Oregon Stormwater Manual.

A diagram shows a pond with pipes leading to an outlet structure. The different design objectives of flood control zone, erosion control zone and water quality control zone are illustrated based on potential water levels of the pond.

Typical control structure: Ontario Stormwater Manual.

Stormwater Control: IECA Australasia


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