2.0 Flashcards
The loci of points that separates two adjacent watershed.
Watershed divide
A line that divides the highest point into two.
Ridgeline
The difference in elevation between two reference point
Watershed Relief
Difference between the highest point on watershed and watershed outlet.
Maximum Relief
Is the basic unit used in most hydrologic calculations
Watershed
It is the plot of flow vs time
Hydrograph
Watershed characteristics that affect hydrologic response
Size, shape, slope, soil type, storage
Naturally, the only thing that can control water is ______
Gravity
NRCS means
Natural Resources Conservation Service
Is responsible for developing soil maps to provide information on soil type, soil texture, and hydrologic soil groups.
NRCS
3 main soil classes
Sand
Silt
Clay
It is important in determining water-holding capacity and infiltration capacity of a soil layer.
Soil texture
Can be used to measure elevation changes.
Topographic maps or Field Surveys
Type _ infiltrates at the highest rate.
Type A
Particles smaller than 0.002mm
Clay
Particles ranging from 0.002 to 0.005mm
Silt
Particles ranging from 0.005 to 2.0mm
Sand
Particles larger than 2.0mm
Gravel
Parameters or Physiographic characteristics frequently used in hydrologic studies.
- Total drainage area
- Impervious area in percentage of drainage area
- Average basin slope
- Hydraulic conductivity
- Hydrologic soil group and water capacity
- Land use of the basins
- Detention storage
- Percent of watershed upstream
- Percent of area drained
