Water Resources Engineering

Size the reservoir storage from the mass curve of cumulative inflow versus cumulative demand, add dead storage for sediment accumulation, and fix the full-supply and drawdown levels for the intended purposes.

Design lined canals by Manning’s equation for a chosen efficient section, and unlined alluvial canals by regime theory (Kennedy or Lacey) which fixes a non-silting non-scouring velocity so the channel neither silts up nor erodes.

Compute the crop water requirement from the reference evapotranspiration and crop coefficient (ET_c = K_c·ET_0), and relate duty, delta and base period through Δ = 8.64 B/D to size the canal supply.

Apply Darcy’s law to aquifer flow and the well equations (Thiem for steady, Theis/Jacob for unsteady) to find drawdown and discharge, keeping the safe yield within the recharge to avoid depletion.

Select the training measure to the objective — guide banks and spurs to direct flow, revetments to protect banks, levees to contain floods — and size guide banks to about 1–1.5 times the river width at design discharge.