Rivers- Human Factors that affect the storm hydrograph

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How do Urban areas affect Lag Time and Peak Discharge?
In urban areas, much of the soil is covered with man-made impermeable materials like concrete. Water can't infiltrate into the soil, which increases SRO, so water flows more quickly into the river- Lag Time is short and Peak Discharge is increases.
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How do man-made drainage systems affect Lag Time and Peak Discharge?
Water flows down drains into the river before it can evaporate or infiltrate into the soil, causing a shorter Lag Time and increased Peak Discharge
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Card 2

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How do man-made drainage systems affect Lag Time and Peak Discharge?

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Water flows down drains into the river before it can evaporate or infiltrate into the soil, causing a shorter Lag Time and increased Peak Discharge

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