Iowa Code § 8.30: Availability of appropriations.

The appropriations made are not available for expenditure until allotted as provided for in section 8.31. All appropriations are declared to be maximum and proportionate appropriations, the purpose being to make the appropriations payable in full in the amounts named if the estimated budget resources during the fiscal year for which the appropriations are made, are sufficient to pay all of the appropriations in full. The governor shall restrict allotments only to prevent an overdraft or deficit in any fiscal year for which appropriations are made.