Handy exact factors: 1 ha = 10,000 m² · 1 ML = 1,000 m³ = 1,000,000 L · 1 ML/day ≈ 11.574 L/s · 1 m head = 9.80665 kPa · 1 bar = 100 kPa · 1° = 60′ = 3600″ · 1 rad = 180/π ≈ 57.2958°. For reference and checking only — verify with a qualified engineer.
References: 1 m head of water = 9.80665 kPa (standard gravity g₀ = 9.80665 m/s², ISO 80000); 1 international acre = 4,046.856 422 4 m²; 1 psi = 6.894757 kPa; 1 ML/day = 1,000 m³ / 86,400 s.