The school board shall provide for the keeping of accurate records of the issuance of the bonds and payment, retirement and cancellation thereof, and of the revenues and receipts from, and the disbursements for the project separate from the other funds of the district. The proceeds of bonds and the net revenues and receipts from the project, other than the amounts allocated to the athletic and recreational funds of the high schools as hereinafter provided, and any gifts or contributions of funds are the property and funds of the district and devoted to the purposes provided for herein, and the treasurer of the school district is custodian of the funds and shall disburse them upon vouchers of the district as in the case of other funds of the district. If there is in any year a surplus from the revenues of the project beyond the amount reasonably anticipated to be necessary to meet the requirements of sections 164.231 to 164.301, the surplus or a portion thereof in the discretion of the board may be allocated and transferred to the athletic and recreational funds of the various high schools of the district.