1.3 Flashcards
It is the elevation difference between two reference points within a watershed.
Watershed Relief
It is the difference between the highest point on the watershed divide and the watershed outlet.
Maximum Relief
Is a plot of elevation vs horizontal
Longitudinal Profile of the Main Channel
It is an indicator of channel gradient
Longitudinal Profile of the Main Channel
TRUE OR FALSE
Channel gradient vary from about 2.0 (20%) for a mountain stream and as low as 0.0002(0.02%) for coastal areas.
FALSE.
Correct Answer:
1.0(10%) for mountain stream and 0.0001(0.01%) for coastal areas.
It is the product of a channel cross-sectional area and its average velocity at peak conditions.
Peak Flow
It is an important parameter that governs peak flow in most of the hydrologic prediction methods.
Watershed Area
TRUE OR FALSE
The smaller watershed area, the greater the surface runoff rate, the overland flow rate, and the streamflow rate.
FALSE
Correct Answer:
The larger the watershed area
It is a contiguous area that drains to an outlet.
Watershed
Basic Components of Hydrologic Cycle
Precipitation (+)
Evaporation (-)
Evapotranspiration (-)
Infiltration (-)
Overland Flow
Streamflow
Ground water Flow
TRUE OR FALSE
Urban watersheds only include man-made elements.
FALSE
Correct Answer:
It includes both natural and man-made elements.
1 acre is equal to how many ft²?
43,560 ft²
1 ac-in is equal to how many cfs-hr?
1.008 cfs/hr
It determines the volume of runoff to be expected from a given rainfall event that falls over the area.
Watershed or Basin
It is the loci of points (the ridge line) that separates two adjacent watersheds, which then drain into two different outlets.
Watershed divide
It is used to determine directions of surface runoffs.
Topographic divide
TRUE OR FALSE
Runoff originates at higher elevations and moves toward lower elevations in a direction perpendicular to the contour lines
TRUE
This term is sometimes used synonymously for just the surface portion of the watershed.
Catchment
The flow of water through the surface of the soil.
Direct Runoff
It is the basic hydrologic unit which all measurements, calculations, and predictions are made in hydrology.
Watershed
The simplest system. Confined on all four sides with a single outlet.
Impervious inclined plane
