hjkiire
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Hi,
Do thin & narrow drainage basins result in a flashier hydro-graph compared to a wide and flat drainage basin which would cause a more subdued hydro-graph?
This is in relation to the case study I have for the water cycle in A level geography. It's looking at the Eden basin in Cumbria which has a thin & narrow drainage basin.

That seems more correct than what my notes say, which are the other way around...

Thank you if you can heplp!
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spqr101
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Hi! I’m pretty sure that a wider and flatter drainage basin will have a more subdued hydrograph as surface runoff has a longer distance to travel to reach the river, therefore a longer lag time. As you stated, it is ‘flatter’- this means that there is less relief and precipitation is flowing slowly down a shallow gradient, meaning it has more time to infiltrate into the soil. Precipitation will flow as throughflow, a slow flow process, hence a subdued hydrograph.

A narrower drainage basin will have a flashier response as surface runoff has less distance to travel and therefore there is a shorter lag time. The basin will have a steeper gradient, meaning precipitation will be flowing quickly downhill due to gravity, hence less time to infiltrate into the soil. Precipitation flows as surface runoff, a quick flow process, resulting in a flashy hydrograph.
That’s what we learnt in the Rivers topic of GCSE Geography anyway.
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hjkiire
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(Original post by spqr101)
Hi! I’m pretty sure that a wider and flatter drainage basin will have a more subdued hydrograph as surface runoff has a longer distance to travel to reach the river, therefore a longer lag time. As you stated, it is ‘flatter’- this means that there is less relief and precipitation is flowing slowly down a shallow gradient, meaning it has more time to infiltrate into the soil. Precipitation will flow as throughflow, a slow flow process, hence a subdued hydrograph.

A narrower drainage basin will have a flashier response as surface runoff has less distance to travel and therefore there is a shorter lag time. The basin will have a steeper gradient, meaning precipitation will be flowing quickly downhill due to gravity, hence less time to infiltrate into the soil. Precipitation flows as surface runoff, a quick flow process, resulting in a flashy hydrograph.
That’s what we learnt in the Rivers topic of GCSE Geography anyway.
Ahh thank you for clearing this up. It definitely seems more logical. I guess I just wrote my notes the wrong way around.

Thank you!
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spqr101
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(Original post by hjkiire)
Ahh thank you for clearing this up. It definitely seems more logical. I guess I just wrote my notes the wrong way around.

Thank you!
No problem! I think we’ve all had that last minute panic haha
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