The head of water available for hydropower generation is calculated as the difference in water levels between the:

ہائیڈرو پاور جنریشن کے لیے دستیاب پانی کے سربراہ کا حساب پانی کی سطح میں فرق کے طور پر کیا جاتا ہے:

Water source and the dam

Inlet and outlet of the powerhouse

Dam and penstock

Reservoir and turbine

Head is the change in water levels between the hydro intake and the hydro discharge point.

It is a vertical height measured in metres.