GG101 Lecture Notes - Hydrograph, Urban Stream, Soil
Document Summary
Smaller basin responds more rapidly because flow pathways are shorter. Urban basin = impermeable = more overland flow. Permeable =slower response time, water flows to the channel. Heavier storm, the stream will respond accordingly. Antecedent (preceding) soil moisture conditions: change. How do streams respond to changes, for example, a change in the land use in a basin. Greatly reduced, average infiltration capacity of pavement is 0. Groundwater: unsaturated zone, saturated zone, water table, aquifer. Aquifer = any geological material that yields fresh water: aquifer, aqiclude. Have to pump water from deeper and deeper, increases costs of getting the water. Compaction of underlying materials (does not tend to be uniform: contamination. Underground storage tanks, always leaks, point sources of contamination: example of landfill. Best strategy is clay leachate collection system collects leachate that leaks, treat the leachate that we collect. On top of it put a cap (low permeability), reduces amount of precipitation.
