Urban Hydrology Quiz 2 Review
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21 Terms
Watershed
Area where all water drains to one point
Mass Balance
Water in = Water Out + Water stored
Return Period
How often a storm happens (ex. 10 yr storm)
Risk
Chance a storm happens in a certain time
Porous media
Soil with tiny spaces that hold water
Porosity (n)
How much empty space is in soil
Saturation (S)
How full the soil is with water
Water Content
Amount of water in soil
Matric potential
How tightly soil holds water (suction force)
Brooks-Corey model
Equation to describe how water moves in soil
Infiltration capacity
Max rate soil can absorb water
Horton Model
Infiltration starts high, then decreases over time
Infiltration volume
Total water that goes into soil
Runoff volume
Water that flows over land
Hyetograph
Graph of rainfall vs. time
Streamflow
Water flow in a stream
Baseflow
Slow groundwater flow into stream
Infiltration excess runoff
Rainfall > Intensity - runoff (horton)
Saturation-excess runoff
Soil already full - extra water runs off
SCS Curve Number (CN)
Estimates how much runoff happens
Depends on soil + land use
Convolution
Combine rainfall data with unit hydrograph
Used to find storm hydrograph
