GLG 112 Study Guide - Final Guide: Big Thompson River, Natural Landscape, Water Table
Document Summary
In a meandering stream, where does most of the erosion occur: outside the meander. Flood severity: size and gradient of drainage basin, amount of precipitation and distribution, urbanization: roots, pavement, sidewalks, increase runoff, rate precipitation soaks into the ground soil saturation. Intense rainfall over a short period of time. Which environment would cause the most infiltration: natural landscape with abundant vegetation. Long duration floods: water level rises/falls slowly, occur further downstream/ closer to base level, cover a wide area (area with large floodplain, the ground becomes saturated. Long duration storms: water table can rise to the surface runoff increases, combined discharge from tributaries, 1993 mississippi river flood, regional flooding in thailand. Levees: pro: contain water within stream channel, cons: built to a very specific standard, false sense of security, decrease sediment supple to floodplain leads to subsidence. Increases erosion in channel: cause problems downstream through increasing discharge/ velocity.
