The largest Dublin housing development awaiting approval under the government's fast-track planning system has been refused by An Bórd Pleanála.

The development by developer Michael Cotter’s firm Viscount Securities would have seen the construction of 927 residential units.

As first reported by The Irish Times, Viscount submitted plans for a total of 365 houses and 562 apartments at Clay Farm in Leopardstown under the Government’s new fast-track system.

In its ruling Bórd Pleanála said the applicant had not provided adequate information in relation to storm water management in the area, which is prone to flooding.

The decision to refuse was decided by a casting vote from the board’s chairperson.

“Considerable uncertainties regarding the issue of drainage across the entire site remained, sufficient to preclude these options”, the board said.

The system under which the company submitted the plans for the site is part of the Government’s Strategic Housing Development initiative which allows developers to bypass local-authority planning processes for developments of more than 100 homes, or blocks of 200 student rooms.

The system was introduced last year in an effort to address the current housing crisis.