Difficulty: Easy
Correct Answer: Kennedy’s theory
Explanation:
Introduction / Context:
Before widespread digital computation, designers relied on graphical tools to solve iterative canal-design equations. Garnett’s diagrams are classic aids connected with one of the two well-known regime design approaches: Kennedy and Lacey.
Given Data / Assumptions:
Concept / Approach:
Kennedy’s theory centers on critical velocities to prevent silting/scour and involves interdependent variables (depth, velocity, slope). Garnett produced graphical charts to streamline these computations, allowing designers to read off solutions for given discharge and silt grade.
Step-by-Step Solution:
Verification / Alternative check:
Many irrigation texts list “Garnett’s diagrams for Kennedy’s design” alongside regime tables.
Why Other Options Are Wrong:
Lacey’s method uses a different set of empirical relations; Gibb’s and Lindley’s are not the standard attributions for Garnett’s charts.
Common Pitfalls:
Conflating graphical tools across theories; overlooking that each regime theory has its own calibration and parameters.
Final Answer:
Kennedy’s theory
Discussion & Comments