The HYCHL program is introduced and ways in which it is an enhanced combination of Hydraulic Engineering Circulars 15 and 11 are described. HYCHL is a program that assists in designing roadside channel linings and riprap lining for irregular channels by analyzing lining stability on the basis of permissible shear stress. Enhancements discussed include: (a) flexiblity in the calculation of Manning's roughness coefficient by giving a designer both a choice of method anda default method; (b) ability to change Shields' parameter for riprap linings; (c) capability of analyzing irregular channel cross sections for riprap linings; and (d) ability to design riprap size on the basis of stability factors and channel shape. The use of the program for both roadside and natural channels is demonstrated with examples
Samenvatting