The budget shall include all of the following:
(a) Expenses theretofore incurred for the payment of which funds are not available.
(b) The cost of an annual watermaster report covering the current calendar year to be prepared at the end of said year.
(c) A reasonable estimate for contingencies.
(d) Other costs of administration of the service area or of distribution of water therein.
(Enacted by Stats. 1943, Ch. 368.)