Which hydraulic effect diminished water pressure progressively downslope in early Mughal garden canal systems?

💡 Explanation

Silt deposition reduces canal cross-sectional area, increasing the hydraulic radius and flow resistance via increased wall roughness, causing frictional flow reduction because available pressure dissipates overcoming this resistance rather than maintaining velocity head; therefore, silt dominates, rather than evaporation/deformation which are extrinsic.

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