As an active builder and sponsor of irrigation works, Firoz Shah Tughlaq repaired and constructed canals and established administrative structures to fund and maintain them. To finance these irrigation projects and their upkeep, he instituted the Haq-i-Sharb (also called Hasil-e-Sharb) — essentially a water or irrigation tax on lands benefiting from state-provided irrigation. This levy linked usage of state irrigation infrastructure to maintenance costs and became part of his fiscal framework for supporting public-works investment and agricultural improvement.