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Roof Drains for patios of multistory buildings

Roof Drains for patios of multistory buildings

Roof Drains for patios of multistory buildings

(OP)
I am designing a 11 story condo building that has stepped back roof terraces on the upper 6 levels. The code requires a roof drain  with an  overflow above  the drain. How have others handled this  overflow  drain. The architect has the  roof drain(s) in the center  of the terrace and  doesn't want any  protrusion above the terrace. Any suggestions would  be appreciated.  

Second question In this city we have experienced water backing up  and  filling the roof leaders of multistory buildings due to the inadequacy of the city drainage system  during high intensity  storms. Does any one know  of a device to relieve this condition when it occurs.

RE: Roof Drains for patios of multistory buildings

Secondary drainage is required in case the primary drain blocks.  It can be met by overflow drains, scuppers in a parapet or the roof structure will have to be designed to support any ponding water.  The first two are the most typical I have seen.

See if there will be a parapet on the terrace.  If that is the case, the architect can put scuppers 2-4" above the terrace level.  This should satisfy the secondary drainage requirement.

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