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Engineering Hydrology Chapter 6 Hydrograph Analysis
ENGINEERING HYDROLOGY (ENCE 306)
Chapter 6: Hydrograph Analysis
8 Hours 12 Marks

Hydrograph Analysis Notes

About this Chapter

This document contains the complete study material for Chapter 6: Hydrograph Analysis. Hydrographs are essential tools for predicting flow responses to rainfall events in a catchment area.

In this chapter, students will learn to identify the components of a storm hydrograph, techniques for base flow separation, and how to derive a direct runoff hydrograph. The core of the chapter focuses on Unit Hydrographs, including their derivation from isolated and complex storms, duration adjustments using the S-curve, and synthetic generation via Snyder’s method.

Syllabus: Hydrograph Analysis

6. Hydrograph Analysis
8 hours
12 Marks

6.1 Components of a rainstorm hydrograph

6.2 Factors affecting shape of rainstorm hydrographs

6.3 Separation of base flow

6.4 Effective rainfall hyetograph and direct runoff hydrograph

6.5 Unit hydrographs: Introduction; Uses and limitations

6.6 Derivation of unit hydrographs from isolated and complex storms

6.7 Derivation of unit hydrographs of different durations (Superposition and the S-curve)

6.8 Synthetic unit hydrograph (Snyder’s method)

Micro Syllabus

6. Hydrograph Analysis
8L · 6T · Week 10
Topic / Sub-topic Description Depth Code Hours
6.1 Components of a Storm Hydrograph Definition and components of a storm hydrograph with labeled sketch. D, E, I, SK 0.5
6.2 Factors Affecting Shape of Storm Hydrographs Factors affecting the shape of storm hydrographs (catchment, rainfall, and climate factors). D, E, I 0.5
6.3 Separation of Base Flow Separation of base flow by three standard methods. E, I, SK 0.5
6.4 Effective Rainfall Hyetograph and Direct Runoff Hydrograph Derivation of effective rainfall hyetograph and direct runoff hydrograph. E, I, SK 0.5
6.5 Unit Hydrographs: Uses and Limitations Definition of unit hydrograph; its uses and limitations in flood estimation. E, I, SK 0.5
6.6 Derivation of Unit Hydrographs from Isolated and Complex Storms Derivation of unit hydrographs from isolated storms and complex multi-peak storms with numericals. E, I, SK, NUM 2
6.7 Derivation of Unit Hydrographs of Different Durations Method of superposition and the S-curve method for changing UH duration; with numericals. E, I, SK, NUM 2.5
6.8 Synthetic Unit Hydrograph – Snyder’s Method Synthetic unit hydrograph derivation using Snyder’s method for ungauged basins. E, I, SK 1
Evaluation: QA, Q
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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