Question

12. What is the hydraulic head made of in unsaturated subsurface flow? Circle all that apply. a) Capillary pressure head b) Velocity head e) Elevation head d) Hydrostatic pressure head e) Nonhydrostatic pressure head 13. What is the hydraulic head made of in saturated groundwater flow? a) Capillary pressure head b) Velocity head c) Elevation head d) Hydrostatic pressure head e) Nonhydrostatic pressure head 14. What does the curve number (CN) represent in the SCS method for rainfall abstraction? Circle all that apply. a) Land cover b) Flow criticality c) Land use d) Laminar vs. turbulent flow e) Soil type 1) Travel time g) Antecedent soil moisture condition 15. Answer the following: a) Between the pre- and post-development conditions of a catchment, which has a larger CN value? b) Would a larger CN increase or decrease runoff Would a larger CN increase or decrease peak discharge at the catchment outlet? d) Would a larger CN shorten or lengthen the time it takes for the peak discharge to arrive at the outlet? 16. Determine the lost head in 500 m of smooth 300 mm inside-diameter pipe when water at 15 °C flows at 1.5 m/s.

Answer 1

12. b c e

13. a, c,d.  

14. a, c,e

15. a) post develepment CN

b) increase

c) increase

d) shorten