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11 what would you look for in the hills above a house

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11. What would you look for in the hills above a house, in order to gauge whether there is asignificant risk of that house being hit by a debris flow? How does land use affect thisrisk? What can be done to reduce the risk to the house or to the people living in it? Youmay use a drawing to illustrate your answers.How to gauge risk
4.Sustained, intense rainfall, causing high water content in soil, reduced frictionalstrength (rainfall as trigger)Effects of land use1.Cutting down trees (reduces strength and increases water content)2.Diverting drainage to the valley3.Cutting the toe or undermining the hillslopeReduce Risk1.Get out of the way2.Remove unstable soil3.Provide drainage to prevent saturation4.Dams or walls to stop debris flows running down valley once started5.Warning system12. Draw an idealized longitudinal profile of a river from the mountains to the ocean. Labelmajor slope changes. List the four major river types based on the size of sediment on thebed, and identify where they occur on the profile. Which river types are most likely tohave: a) well developed wetlands, b) little or no floodplain, c) well-developed rivermeanders, and d) food resources and habitats primarily in the floodplain environmentrather than the channel?13. Using drawings to illustrate the relevant processes, explain (in writing) the two primarymechanisms responsible for floodplain formation. Be sure to label features on yourdrawings. On rivers without dams or artificial banks to control flooding, how often wouldflows typically spill onto the floodplain? Why is property damage due to flooding fromrivers steadily increasing throughout the world?
2.Overbank deposition- When a river is in flood, sediment is carried in suspension byturbulence of the flow onto the floodplain settles out, with the coarsest sedimentdeposited at the banks forming levees14. Describe 6 environmental consequences of timber harvesting in the Northwest.
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Term
Fall
Professor
Kirchner,J
Tags
Hydrology, Climate Change, d Water, total water

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