20.4 - Empirical Methods
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Practice Questions
Test your understanding with targeted questions
What is the Blaney-Criddle equation used for?
💡 Hint: Look for the equation involving k, p, and T.
Define the Thornthwaite method.
💡 Hint: Focus on temperature and its importance in this context.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the main purpose of empirical methods in estimating ET?
💡 Hint: Think about why we use formulas instead of measuring directly.
True or False: The Hargreaves method is less accurate than the Thornthwaite method.
💡 Hint: Recall the characteristics of both methods.
1 more question available
Challenge Problems
Push your limits with advanced challenges
A regional agricultural extension office is analyzing ET for potential irrigation planning. They have data showing the monthly average temperature as 30°C, the percentage of daylight in July as 60%, and a crop coefficient of 1.2. Use the Blaney-Criddle method to calculate ET.
💡 Hint: Start with the equation definition and plug in the values carefully.
A soil and climate research team is comparing the Thornthwaite and Hargreaves methods. They observe monthly temperatures averaging 20°C in winter. Discuss which of the two methods might give them a better estimate and why.
💡 Hint: Think about the factors each method considers.
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