Photo AI
Using Figure 2a, Figure 2b and your own knowledge, assess the potential impact of changing vegetation cover upon the runoff in this area - AQA - A-Level Geography - Question 1 - 2019 - Paper 1
Question 1
Using Figure 2a, Figure 2b and your own knowledge, assess the potential impact of changing vegetation cover upon the runoff in this area. Figure 2a shows two maps ... show full transcript
Worked Solution & Example Answer:Using Figure 2a, Figure 2b and your own knowledge, assess the potential impact of changing vegetation cover upon the runoff in this area - AQA - A-Level Geography - Question 1 - 2019 - Paper 1
Step 1
Assess the impact of changing vegetation cover on runoff in 1976
Answer
In 1976, the watershed displayed a mix of bare soil, forest, and grassland. The vegetation cover at this time would have significantly contributed to water absorption and reduced runoff. With dense forests, the canopy intercepts rainfall, promoting infiltration and minimizing surface runoff. Therefore, a higher ratio of forested areas likely led to lower runoff volumes.
Step 2
Assess the impact of changing vegetation cover on runoff in 2001
Answer
By 2001, there was a noticeable shift in vegetation cover as shown in Figure 2a. Areas that transitioned to bare soil or built-up zones would have experienced increased runoff. This is because less vegetation means less interception of rainfall and reduced soil moisture capacity. Consequently, we can expect that runoff volumes increased during storm events compared to 1976.
Step 3
Assess the potential impact of rehabilitation on runoff
Answer
The prospect of rehabilitation as shown in the third map suggests restoring vegetation could mitigate increased runoff. Reintroducing natural vegetation will enhance soil structure and increase water absorption, subsequently reducing peak runoff after storms. This reflects a proactive approach to managing water resources in the watershed, aiming for long-term sustainability.