70 ILCS 605/4-25
In districts which have an annual maintenance assessment, the commissioners may build up and maintain a contingency fund to meet emergencies arising from flood, overflow or act of God to meet maintenance expenses which exceed the annual maintenance assessment and to pay lawful obligations incurred by the district. This fund shall not exceed an amount equal to the total of 2 years' annual maintenance assessment. This fund may be accumulated out of the surplus, if any, of the annual maintenance assessments or out of the surplus from any prior assessment. The contingency fund shall be deposited with the treasurer of the district who may, with prior court approval, invest all or a portion of the funds in interest bearing obligations of the Federal Government or insured deposit accounts. The contingency fund shall be used, with or without prior court approval, to meet emergencies and maintenance expenses of the nature above described, provided, however, that if new or additional works are required in the district, the residue of the contingency fund may, by order of the court, be transferred to the general corporate funds and be used in the construction of work in accordance with the plans approved by the court. The maintenance of this fund shall not prejudice the right of the commissioners to collect annual maintenance assessments.
70 ILCS 605/4-25