Except for costs borne by the United States or the State Highway Administration, the county shall pay all costs of a flood control or navigation project from the Stormwater Management Fund. The county shall apply the Fund to the cost of: constructing and relocating all county roads and bridges related to the flood control or navigation project; constructing necessary internal drainage facilities; relocating utility structures; and acquiring land and buildings necessary for the flood control or navigation projects. The county may accept contributions from the United States, the District of Columbia, the State, Montgomery County, any municipal corporation or special taxing district, or any other person if the county determines that the contribution may assist in the construction of any project under this subtitle.