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Engineering Hydrology Chapter 3 Abstractions from Precipitation
ENGINEERING HYDROLOGY (ENCE 306)
Chapter 3: Abstractions from Precipitation (Hydrological Losses)
6 Hours 8 Marks

Abstractions from Precipitation Notes

About this Chapter

This document contains the complete study material for Chapter 3: Abstractions from Precipitation (Hydrological Losses). Understanding water losses is critical for calculating effective runoff and overall water budget.

In this chapter, students will learn about initial losses (interception and depression storage) and delve into the calculations of evaporation and evapotranspiration. The syllabus also heavily covers the concepts of infiltration, including different infiltration models (like Horton’s equation) and indices (φ and W).

Syllabus: Abstractions from Precipitation

3. Abstractions from Precipitation (Hydrological Losses)
6 hours
8 Marks

3.1 Initial losses: Interception and depression storage

3.2 Evaporation

3.2.1 Meteorological parameters: Radiation, temperature, vapor pressure, humidity and wind speed

3.2.2 Measurement of evaporation by Evaporimeters

3.2.3 Empirical evaporation equations: Meyer’s and Rohwer’s formulae

3.2.4 Evaporation estimation by water-budget and energy-budget methods

3.3 Evapotranspiration

3.3.1 Actual evapotranspiration and measurement by Lysimeters

3.3.2 Potential evapotranspiration and estimation by Penman’s equation

3.4 Infiltration

3.4.1 Measurement of infiltration by Infiltrometers

3.4.2 Infiltration models: Horton; Introduction to Kostiakov, Phillip and Green-Ampt

3.4.3 Infiltration indices: φ and W

Micro Syllabus

3. Abstractions from Precipitation
6L · 4T · 1P · Week 5
Topic / Sub-topic Description Depth Code Hours
3.1 Initial Losses Initial losses due to interception and depression storage. D, E, I 0.5
3.2.1 Meteorological Parameters for Evaporation Evaporation and its controlling parameters: radiation, temperature, vapor pressure, humidity, and wind speed. D, E, I 0.5
3.2.2 Measurement of Evaporation Measurement of evaporation by different types of evaporimeters; pan coefficients. E, I, SK 0.5
3.2.3 Empirical Evaporation Equations Empirical evaporation equations: Meyer’s and Rohwer’s methods with numericals. E, I, NUM 1
3.2.4 Evaporation Estimation Evaporation estimation by water-budget, energy-budget, and mass transfer methods. E, I, NUM 0.5
3.3.1 Actual Evapotranspiration and Lysimeters Actual evapotranspiration; measurement using lysimeters. D, E, I, SK 0.5
3.3.2 Potential Evapotranspiration Estimation of potential evapotranspiration by Penman’s equation (energy and mass transfer approaches) with numericals. D, E, I, NUM 1.5
3.4.1 Measurement of Infiltration by Infiltrometers Infiltration and percolation; infiltration rate and capacity; measurement by infiltrometers. D, E, I, SK 0.5
3.4.2 Infiltration Models Introduction to infiltration models: Horton, Kostiakov, Phillip, and Green-Ampt. Numerical solution on Horton’s model only. E, I, NUM 1
3.4.3 Infiltration Indices (φ and W) Estimation of infiltration indices φ (phi) and W indices. D, E, I, NUM 0.5
Evaluation: QA, Q, ST
Lecture Notes (By KN Dulal & Mithun Kuwar)

Credit: KN Dulal & Mithun Kuwar Sir
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Special thanks to KN Dulal and Mithun Kuwar Sir for providing these comprehensive lecture notes.

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