| 21. | In hydrology, "'snowmelt "'is surface runoff produced from melting snow.
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| 22. | Nitrate is highly soluble, and propagates through the soil into ground water and surface runoff.
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| 23. | Trees and other plants help to control surface runoff.
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| 24. | Shallow drainage work mainly intercepts surface runoff and keeps it away from potentially unstable areas.
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| 25. | Surface runoff in hydrologic systems is generally conceptualized as occurring from pervious and impervious areas.
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| 26. | Lake Kampeska briefly experienced problems with pollution from fertilizer and surface runoff until the 1990s.
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| 27. | Lake Minnetonka had problems with pollution from sewage, fertilizer, and surface runoff until the 1970s.
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| 28. | The headwaters of North Mahanoy Creek are in unpolluted springs and surface runoff near Locust Mountain.
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| 29. | Seventy percent of surface runoff is collected from rain, and 30 percent from rain on snow.
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| 30. | The amount of hydroelectric power generated is strongly affected by changes in precipitation and surface runoff.
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