weir.broadcrest         Compute Open-Channel Flow over Broad-Crested
                        Weir
weir.sharpcrest         Compute Open-Channel Flow over Sharp-Crested
                        Weir
weir3a5.broadcrest      Compute Open-Channel Flow over Broad-Crested
                        Weir by TWRI3A5
weir3a5.sharpcrest      Compute Open-Channel Flow over Broad-Crested
                        Weir by TWRI3A5
weirbos.broadcrest      Compute Open-Channel Flow over Broad-Crested
                        Weir by Bos (1989)
