1. Surface Runoff and Hydrograph Components
Describe runoff drainage patterns
Identify stream order
Sketch components of a runoff hydrograph
Compare how basin features, storm location and direction affect hydrograph properties
Compute baseflow and direct runoff volumes
Describe steps involved in calculating runoff hydrography from rainfall (will quantify next time)
Mays pages

2. Runoff drainage patternsB.
Dendritic - uniform erosion
Rectangular – faults
Trellis on folded terrain
Trellis on mature coastal plain C. D.
From Mays, 2011, Ground and Surface Water Hydrology

3. Example. What type of drainage pattern does the Logan River watershed exhibit?
Dendritic -uniform erosion
Rectangular –faults
Trellis on folded terrain
Trellis on mature coastal plain

4. Basin order is the highest order branch -- at the outlet)
Stream Order
1 = non-branching
2 = only receive 1st order streams
Basin order is the highest order branch -- at the outlet)
From Mays, 2011, Ground and Surface Water Hydrology

5. Example. What is the stream order at X, Y2 X 1 1 2 3 4 5 3 Y
CEE 3430

6. Separating sources of streamflow
Dry
Wet
From Mays, 2011, Ground and Surface Water Hydrology

7. Effects of basin features on the hydrograph
Slope
Roughness
Storage A B

8. Effects of storm location and direction on the hydrograph

9. Effect of Watershed Shape: Which hydrograph is associated with each watershed1 B 2 3 C

10. Example. How do the Logan River hydrographs at First Dam for 2009 and 2011 differ?
CEE 3430

11. Example. What is the volume of direct runoff (in mm) from a 120 ha catchment with a baseflow of 0.05 m3/s and the specified discharge hydrograph?

12. Direct Runoff and Rainfall Excess
Time
From Mays, 2011, Ground and Surface Water Hydrology

13. Rainfall – Runoff Analysis
From Mays, 2011, Ground and Surface Water Hydrology

14. Today we… Described runoff drainage patterns Identified stream order
Sketched components of a runoff hydrograph
Compared how basin features, storm location and direction affect hydrograph properties
Computed baseflow and direct runoff volumes
Described steps involved in calculating runoff hydrography from rainfall (will quantify next time)