Iowa Code § 384.110: Insurance, self-insurance, and risk pooling funds.

A city may credit funds to a fund or funds for the purposes authorized by section 364.4, subsection 5; section 384.12, subsection 3; or section 384.24, subsection 3, paragraph “s”. Moneys credited to the fund or funds, and interest earned on such moneys, shall remain in the fund or funds until expended for purposes authorized by section 364.4, subsection 5; section 384.12, subsection 3; or section 384.24, subsection 3, paragraph “s”.