30.4.2. Philip’s Equation

Try these first

1. 1.

   What does the term 'S' in Philip's Equation represent?

   Hint

   Think about how fast water starts soaking into the ground.

2. 2.

   What is the purpose of the steady infiltration rate (A)?

   Hint

   This rate comes after the initial period of absorption.

3. 3.

   What does 'S' in Philip’s Equation measure?

   • Water retention
   • Soil absorbency
   • Initial absorption rate

   Hint

   Consider how rapidly soil begins to soak up water.

4. 4.

   Philip's Equation is primarily used in which field?

   • Biology
   • Physics
   • Hydrology

   Hint

   This field focuses on water and its distribution.

5. 5.

   An area of sandy soil has a sorptivity of 0.3 cm/min, and a steady infiltration rate of 1.5 cm/min. Calculate the infiltration capacity after 10 minutes.

   Hint

   Remember, you'll want to break it down by plugging in each value as per the equation's components.

6. 6.

   Discuss the implications of low sorptivity and steady infiltration rate for flood management in a developed urban area.

   Hint

   Consider all consequences of poor absorption rates in managing stormwater.