(stream capture)Types of Drainage Patterns* dendritic* parallel* radial (center =* out)* rectangular (90 degrees)* trellised (criss-crossed)* annular (concentric radial)* centripetal (out =* center)* deranged (sand bars, topset layers)Stream Histories produce Drainage Patterns* consequent stream pattern- formed by uniform rock units and general slope of region (dendritic or parallel)* subsequent stream pattern- follow folds or rock units, formed in folded or faulted regions (trellissed)* antecedent stream- cuts across folds due to incision during uplift* superposed- cut across different rock units due to stream cutting and angular unconformity Chapter TenGroundwater: All the water contained in spaces within bedrock and regolith.-less than 1% of all water, up to 750m deep-rainfall is sourceZones Near the Surface* zone of aeration- water is present, but ground is not saturated* saturated zone- all openings are filled with water* water table- top of saturated zone Porosity- % of total volume of bedrock/regolith with pores-determins quantity of water a sediment or rock can contain-affected by sorting, arrangement, and cementationPermeability- how easily fluids pass through-molecular attraction affects flow-sediment larger than sand is very permeableRecharge Area- area of water inputDischarge Area- area of water outputwater table shape* humid regions-river is discharge-river is low on water table* dry regions-river is recharge-river is high on water tablemovement of groundwater1.rain goes in (recharge area)* moves downhill thru zone of aeration (percolation-chief movement)1.soil is less permeable than underground2.some water held by molecular attraction* movement in zone of saturation* direction is generally downhill (hydraulic gradient)-Darcy's Law- discharge=flow, permeability, and gradient* velocity relates to water table slope* moves from high points to low points* moves from high pressure to low pressure* subsurface water comes out (di...
