N.Y.C. Admin. Code § 24-506: § 24-506 Temporary sewers.

Whenever it shall become necessary to construct a sewer or drain to prevent damage to property or to abate a nuisance and it is impracticable to proceed immediately to the construction of the same in accordance with any plan already adopted, the commissioner of environmental protection, on the approval of the mayor, may construct a temporary sewer or drain in such manner as to avoid such damage or abate such nuisance.