The storm hydrograph 3.0 / 5 based on 1 rating ? GeographyWater and riversGCSEOCR Created by: Dempsey06Created on: 14-04-15 13:08 5261073149 Across 1. The highest discharge in the period of time you're looking at (4, 9) 4. ... have drainage systems and they're covered with impermeable materials - these increase discharge so hydro-graphs for rivers in ... are steep (5, 5) 5. Causes less runoff and a longer lag time (3, 8) 6. The decrease in river discharge as the river returns to its normal level (7, 4) 7. Causes less runoff and a longer lag time (6, 6) 9. The delay between peak rainfall and peak discharge (3, 4) Down 2. Causes more runoff and a shorter lag time (7, 8) 3. The increase in river discharge as rainwater flows into the river (6, 4) 5. 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) 10. Causes more runoff and a shorter lag time (5, 6)
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