त्रिज्या 'r' के एक तरल जेट (liquid jet) में, आंतरिक गेज दबाव Δp निम्नलिखित में से किस अभिव्यक्ति द्वारा पृष्ठ तनाव σ से संबंधित होता है?

In open channel flow measurement, a current meter is primarily used to measure the:

Dupuit's equation for an equivalent pipe is used to:

For flow through soil having permeability k under a total head of H, if the shape factor of the flow net is 0.5, what is the discharge (seepage) through the soil?