The design storm for discharge from an OSD storage, termed the discharge design storm, shall be the minor system design ARIs of the municipal drainage system to which the storage is connected.
The design storm for calculating the required storage volume, termed thestorage design storm, shall be 10 year ARIs.
A major/minor system approach shall be adopted for the planning and design of urban stormwater systems. Event ARIs to be adopted for the planning and design of minor and major stormwater systems shall be in accordance with Table 4.1.
Editor :- Dilah – 7 Mac 14
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