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Watershed area determines water availability and runoff magnitude. Larger watersheds collect more water but exhibit longer response times.
ステップバイステップガイド
- 1Identify divides (ridges), trace water flow to outlet
- 2Calculate total area draining to point of interest
- 3Affects flood peak, minimum flows, and water availability
解いた例
入力
Watershed area 1000 km², annual precipitation 1000 mm
結果
Total inflow ≈ 1000 × 10⁶ m³/year (~30 m³/s average)
Available water for use
避けるべきよくある間違い
- ✕Confusing watershed area with basin depth (elevation range)
- ✕Neglecting urbanization effects (increases runoff despite same area)
よくある質問
Why does watershed size matter for flood?
Larger watersheds have larger flood volumes but longer concentration times. Flash flooding more likely in small steep basins.
Can watershed boundaries change?
Rarely naturally, but dams and diversions alter water routing. Human impacts significant.
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