dublin City Council had planned to increase the number of portaloos around Croke Park for the axed Garth Brooks concerts after the experience of the One Direction gigs.
The lack of sufficient toilet facilities inside and outside the stadium for 1D's three-night stint in May was understood to have contributed to public urination problems, as well as causing lengthy queues.
When devising the plan for the ill-fated Brooks concerts, the council said: "Given what happened at the One Direction [gigs] we would probably have to increase the numbers [of portaloos]."
Among the locations specified were outside the Mater Dei Institute on Clonliffe Road, the junction of Clonliffe Road and Ballybough Road, Mountjoy Square and the junction of North Circular Road and Fitzgibbon Street.
"We also have the option of two good trailer-type urinal units that can be parked up. [They] can take 15/16 persons at a time," a council administrative officer said.
Documents obtained by the Herald also reveal Croke Park had been planning to restrict attendance at the Leinster football final to assist in the preparations for the gigs.
The stadium was going to reduce numbers on Hill 16 from its capacity of about 12,000 to 5,500, a reduction of 6,500, minutes of a meeting on June 3 show.
The meeting was attended by council planner John Downey, Croke Park's Alan Gallagher and Peter Aiken, of Aiken Promotions.
Under the heading 'Proposed Stage Works', Mr Gallagher is recorded as saying: "We will restrict numbers on the Hill for the Leinster final (July 20) to 5,500."
At the beginning of the meeting, the note says Mr Downey "made clear that no decision has been made with regard to the application" to hold the five Brooks concerts.
It adds that the "purpose of the meeting was to discuss if it is logistically possible" to carry out the preparatory works.
The Leinster Final was contested by Dublin and Meath on July 20, with the Dubs coming out on top.
Given Hill 16 is packed whenever the two counties contest a big match, it is likely GAA fans would have reacted angrily to any reduction in the stadium capacity.
However, the "build schedule" for the Brooks gigs was never implemented, following the country and western singer's decision not to play.
It came after the council gave permission for only three of the five concerts, which had been due to take place between July 24 and 28.
The Herald revealed yesterday the minimum cost of policing the events would have been €450,000.
The bill for Friday, Saturday, Monday and Tuesday was going to be €89,040 a night, while the cost for Sunday had been set at €91,040.
A total of 2,276 hours of garda cover would have been required on Sunday and 2,226 hours on each of the other four nights. The rate was set at €40 an hour.
Costs not included in the estimate were the provision of barriers at €2,000 a night and fuel for the Garda helicopter.
The operation was to entail the designation of an armed detective at the Croke Park cash office.