Wherever any excess or surplus remains in any special district in this state created for road improvement, levee, bridge, or drainage construction after the improvement has been completed and all costs and expenses thereof, including all principal and interest of bonds issued, have been paid and the excess or surplus is not needed for the special improvement or for the maintenance thereof; wherever the special improvement district has been abandoned and an excess or surplus remains therein after the payment of all legal and preliminary costs and expenses thereof; or wherever any special taxing funds exist for the payment of outstanding bonds or refunding bonds or other legal purposes and all expenses and costs of the special taxing fund, including the principal and interest of all outstanding bonds, have been paid or a sum sufficient to care for all outstanding bonds or interest outstanding has been created and collected through taxation, or otherwise, and remains in a sinking fund to meet the interest and bonds as they mature, and in addition thereto an excess or surplus remains in the special fund and is not needed nor required to meet the interest and outstanding bonds or other legal cost or expense of the special taxing fund, in each and all of the special districts or special taxing funds, the excess or surplus so remaining as indicated in this section shall, by appropriate court orders, be passed to and become a part of the general revenue funds of the counties where the special districts or special taxing funds exist.