A morphometric analysis of a river basin provides the quantitative data shown below:
| Morphometric Parameter | Value |
|---|---|
| Total Basin Surface Area () | |
| Cumulative Stream Length () |
Based on these hydrological parameters, what is the drainage density of the basin, and what does its magnitude imply about the basin's surface runoff response?
- , indicating a high drainage density associated with rapid surface runoff and high flood potential.Answer
- B, indicating a low drainage density associated with slow surface runoff and dominant groundwater recharge.
- C, indicating a low drainage density because stream channels are widely spaced over highly permeable terrain.
- D, indicating an ultra-dense drainage network resulting from extreme vertical relief mismatch.
Answer
The drainage density of the basin is , which indicates a high drainage density characterized by rapid surface runoff and high peak flood potential.
The correct answer properly calculates drainage density () as the total stream length divided by basin area (). Hydrologically, a high drainage density () signifies a closely knit stream network that collects and transmits storm runoff rapidly, resulting in swift hydrological response and high flood potential.
Step-by-Step Solution
Key Concept
Drainage Density () and Basin Hydrological Response