SETRIC, a Mathematical Model for Sediment Transport in Irrigation Canals - Sediment Transport in Irrigation Canals: A New Approach - page 165

Read input files
(constant parameters, sediment, dimension,
control structures, lateral flows and base flows)

read hydraulic and
morphological data
of previous time step

c ompute discharges
at each subsection

irrigation schedules

Hydraulic calculations

critical depth subroutine

compute normal and
critical water depths

compute water depths at
control points (subroutine
for control structures) normal depth subroutine

compute actual
water depths

subroutine for gradually
varied flow profile
(predictor corrector)

equivalent roughness
(bed forms, maintenance)

store hydraulic
results

equivalent roughness
(bed forms, maintenance)

Morphological calculations

compute equilibrium
concentration
(subroutines for predictors)

compute sediment
concentration

subroutine for the solution
of mass balance equation

compute morphological
changes

correction for non-wide
canal condition

compute new bed level,
width and slope

subroutine for non-
equilibrium concentration

store morphological
results

repeat until the end
of simulation period

next time step

end

Figure 6.1. Flow diagram of SETRIC for calculating the water flow, sediment transport and changes in bottom level in main
and/or lateral canals (after Paudel, 2002).