Lesson 20: NRCS Runoff Method

Learning Objectives

• Explain concepts of potential maximum retention storage (S), runoff curve number (CN), hydrologic soil group, and antecedent moisture condition (AMC)
• Compute CN and S based on landuse/landcover, hydrologic soil group, and antecedent moisture condition
• Calculate rainfall excess using the NRCS runoff method

Handouts (bring to class)

• NRCS Runoff Method

Reading Assignment

• Chin 6.3.3.4 NRCS Curve-Number Model
• Chin 6.3.3.5 Comparison of Infiltration Methods

Homework Problems

• Problem 22
• Problem 23