1.6 Flashcards
2 Types of Watershed
Concentrated and Elongated
It means physical geography of the watershed is a factor.
Physiography
Isochrones means
Equal time
The time where the most remote place in watershed has already contributed to the outflow.
Time of concentration
DRO means
Direct Runoff
It means water may pass through the soil.
Porous media
It is the natural flow of water
Base Flow
Start of the rainfall event and where infiltration happens
Recession
It represent the positive slope
Rising limb
It is where the typhoon dissipates
Falling limb
It is the total rainfall minus the losses
Net rainfall
2 Methods dor base flow separation
Straight Line and Concave Line
A typical hydrograph is characterized by
Rising Limb
Crest segment
Recession Curve
Lowest point of watershed
Outlet
Represents the precipitation minus infiltration
Direct Runoff (DRO)
Happens when there is too much water
Waterlogging
It means that there are no water molecule on the soil
Unsaturated
It means every portion of the soil is filled with water
Saturated
Flooded with water
Flooded Soil
A very small fraction of total flow rate
Channel precipitation
The simplest infiltration method
Phi index
This method assumes that the loss is uniformly distributed across the rainfall pattern
Phi index
Methods for Base flow Separation
Computerized Method
Straight Line Method
Concave Method
