On basis above-mentioned of 3 conventional design criteria following methods were developed: The AISI method prepared by the American Iron and Steel Institute, the ASTM method (prepared by the American Society for Testing Materials), the AASHTO method prepared by the American Association of State Highway and Transportation Officials, the ARMTEC super-span method (prepared by Armtec International from Canada), The CANDE program (prepared by the Federal Highway Administration (FHWA)), The SCI method (prepared by Duncan, M.), The UBC culvert design procedure (it is improvement of SCI method), the OHBDC method (prepared by the Ontario Highway Bridge Design Code), and the
CHBDC method (prepared by the Canadian Highway Bridge Design Code).