The storm hydrograph 3.0 / 5 based on 1 rating ? GeographyWater and riversGCSEOCR Created by: Dempsey06Created on: 14-04-15 13:08 92105314768 Across 1. Means more water is intercepted and evaporates, so less water reaches the channel. Throughflow is also slowed down by roots, so there's a longer lag time (4, 10) 4. ... have drainage systems and they're covered with impermeable materials - these increase discharge so hydro-graphs for rivers in ... are steep (5, 5) 6. The decrease in river discharge as the river returns to its normal level (7, 4) 7. Causes more runoff and a shorter lag time (4, 8) 8. Means less water is intercepted and evaporated so more water reaches the channel. Throughflow isn't slowed down by roots, so there's a shorter lag time (4, 10) 9. The highest discharge in the period of time you're looking at (4, 9) 10. ... have more vegetation, which decreases discharge. There are also more reservoirs in rural areas - they store water and release it slowly, decreasing discharge in the river below. This means hydro-graphs for rivers in ... are more gently sloping (5, 5) Down 2. Causes less runoff and a longer lag time (6, 6) 3. Causes less runoff and a longer lag time (3, 8) 5. The delay between peak rainfall and peak discharge (3, 4)
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