California State University, Sacramento
Week 2: Water resources in the Central Valley, event hydrographs, baseflow recession, gaining and losing streams
Upon completion of this unit students should be able to:
- Discuss the competing interests in California's water
- Understand the concepts of baseflow and baseflow recession
- Construct a stream hydrograph, and use the hydrograph to describe seasonal variability or flood events.
- Describe the geologic factors that influence the shape of a recession curve.
- Distinguish between a seasonal recession curve and a flood hydrograph.
- Analyze a storm hydrograph to separate baseflow from storm input (determine the duration of overland flow).
- Describe groundwater flow patterns for gaining and losing streams.
Fetter, pp. 37-52
Homework Assignment: base flow and stream flow
Homework assignment: Fetter, 4th ed., pp. 62-64, # 9, 10
#9) The flow of a river at the start of a baseflow recession was 712 m3/s; after 60 d the flow declined to 523 m3/s.
a) What is the recession constant?
b) What would the flow be after 112 d?
#10) Assume that the hydrograph in Fig. 2.15 (Fetter, 4th ed,. p. 46) has a drainage basin of 722 mi2. How long will the overland flow continue after the flood peak passes?
Homework solution: Click here for homework solution:
Due Date: Monday, Sept. 10 at the start of class
Show your work to get partial credit!