188.3. The board of directors is not bound to adopt simultaneously all the appropriations of the budget. It may also adopt an appropriation separately.
The board of directors may, before 1 January, adopt temporarily, for a period of three months, one-quarter of every appropriation provided for in the budget. It may, in the same manner, adopt one-quarter of every appropriation before each period beginning 1 April, 1 July and 1 October.
It may also adopt, at the same time:
(1) three-quarters of every appropriation, if it does so before 1 April;
(2) one-half of every appropriation, if it does so before 1 July.