For the purpose of providing funds for the Columbia river basin water supply development program, the state finance committee is authorized to issue general obligation bonds of the state of Washington in the sum of two hundred million dollars, or as much thereof as may be required, to finance the projects and all costs incidental thereto. Bonds authorized in this section may be sold at such price as the state finance committee shall determine. No bonds authorized in this section may be offered for sale without prior legislative appropriation of the net proceeds of the sale of the bonds.