7. 29.5 Empirical Infiltration Models

Try these first

1. 1.

   What is an empirical infiltration model?

   Hint

   Think about whether the model is based on experimentation or theory.

2. 2.

   What does Horton’s model assume about infiltration capacity?

   Hint

   Focus on the term 'exponentially' regarding time.

3. 3.

   What does Horton’s model predict regarding infiltration?

   • Infiltration increases over time.
   • Infiltration decreases over time.
   • Infiltration remains constant.

   Hint

   Consider the effects over time.

4. 4.

   True or False: Philip’s Equation is only applicable to long-duration rain events.

   • True
   • False

   Hint

   Think about the timing of infiltration.

5. 5.

   Using Horton’s infiltration model, determine the infiltration rate at time t=5 minutes if the initial infiltration rate is 20 cm/h, the final rate is 10 cm/h, and the decay constant is 0.1.

   Hint

   First, calculate the exponent before multiplying.

6. 6.

   Compare and contrast the applications of Philip’s equation and Green-Ampt model in urban vs. agricultural settings.

   Hint

   Think about the physical environment and the types of surfaces involved.