188.5. During a fiscal year, the board of directors may adopt a supplementary budget by following the same procedures employed for the adoption of the annual budget, adapted as necessary.
However, the meeting held for the purpose of adopting the supplementary budget may close before it has been adopted. If the supplementary budget has not been adopted within 15 days from the opening of the meeting, the appropriations mentioned in the certificate of the treasurer and included in the supplementary budget, if any, shall be deemed adopted and come into force.