Importance of Water Budget Equation

Cover Feature
The Water Balance or Budget Equation can be treated as the mother of all types of hydro-metereological equations.The equation is derived from Law of Conservation of Mass and Energy and states that inflow of water is equal to outflow of the same.If there exist an unequality,then it will contribute to the existing storage of water of the region.Precipitation and Inflows are accounted under Inflow and Runoff,Ground Water Outflow(contributed by infiltration) and Evapo-Transpiration is treated as Outflow.We can find any one of the variables from the equation if the other ones are already known.
Feature 1	Subsurface Return Flow can be defined as that amount of water which ex-filtrate back to the surface after being infiltrated in the up-slope portion of the hill.
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20 Important Fluid Mechanics MCQs for GATE and Engineering Interviews—with Answers and Explanations

Click here to access the full post : https://hydrogeek.substack.com/p/interviewgate-questions-on-fluid?r=c8bxy Fluid Properties and Hydrostatics Q1. A Newtonian fluid has a dynamic viscosity of 0.5 Pa·s and a shear rate of 20 s⁻¹ at a point. What is the shear stress at that point? (a) 5 Pa (b) 10 Pa (c) 15 Pa (d) 25 Pa Answer: (b) 10 Pa — Shear stress = μ × (du/dy) = 0.5 × 20 = 10 Pa, following Newton’s law of viscosity. Q2. The pressure at a depth of 5 m below the free surface of water (density 1000 kg/m³) is approximately: (a) 5 kPa (b) 49 kPa (c) 98 kPa (d) 500 kPa Answer: (b) 49 kPa — Using , Pa ≈ 49 kPa. Q3. A cube of density 800 kg/m³ floats in water of density 1000 kg/m³. What fraction of the cube’s volume is submerged? (a) 0.6 (b) 0.7 (c) 0.8 (d) 0.9 Answer: (c) 0.8 — By Archimedes’ principle, submerged fraction = ρ_body/ρ_fluid = 800/1000 = 0.8. Q4. The excess pressure inside a spherical air bubble of radius r immersed in a liquid with surface tension σ is given by: (a) σ/r...