Canal hydraulic design

Each reach has its discharge, bed slope, Manning's n and side slope. Manning's formula Q = A R^(2/3) S^(1/2) / n gives the section fixed by the bed width / depth ratio, the bed width or the depth; Lacey's regime theory (unlined alluvial canals) gives its own section and slope from the silt factor.

Free board from IS 10430 (lined) or IS 7112 (unlined) unless typed. The velocity is checked against 2.5 m/s (lined) / 1.0 m/s (unlined) and silting below 0.3 m/s, the Froude number against 0.8. The bed levels run down from the head bed level at each reach's slope.

Apply to the sections makes a template per reach (bed, inner slopes to the bank top, banks, outer slopes) with the full supply level as its own layer, puts the bed levels in as the formation, assigns the reaches and – if ticked – applies the templates. The lining area and volume can be priced in the BOQ (Canal lining).