1.3

Question 1

It is the elevation difference between two reference points within a watershed.

Answer 1

Watershed Relief

Question 2

It is the difference between the highest point on the watershed divide and the watershed outlet.

Answer 2

Maximum Relief

Question 3

Is a plot of elevation vs horizontal

Answer 3

Longitudinal Profile of the Main Channel

Question 4

It is an indicator of channel gradient

Answer 4

Longitudinal Profile of the Main Channel

Question 5

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.

Answer 5

FALSE.
Correct Answer:
1.0(10%) for mountain stream and 0.0001(0.01%) for coastal areas.

Question 6

It is the product of a channel cross-sectional area and its average velocity at peak conditions.

Answer 6

Peak Flow

Question 7

It is an important parameter that governs peak flow in most of the hydrologic prediction methods.

Answer 7

Watershed Area

Question 8

TRUE OR FALSE
The smaller watershed area, the greater the surface runoff rate, the overland flow rate, and the streamflow rate.

Answer 8

FALSE
Correct Answer:
The larger the watershed area

Question 9

It is a contiguous area that drains to an outlet.

Answer 9

Watershed

Question 10

Basic Components of Hydrologic Cycle

Answer 10

Precipitation (+)
Evaporation (-)
Evapotranspiration (-)
Infiltration (-)
Overland Flow
Streamflow
Ground water Flow

Question 11

TRUE OR FALSE
Urban watersheds only include man-made elements.

Answer 11

FALSE
Correct Answer:
It includes both natural and man-made elements.

Question 12

1 acre is equal to how many ft²?

Answer 12

43,560 ft²

Question 13

1 ac-in is equal to how many cfs-hr?

Answer 13

1.008 cfs/hr

Question 14

It determines the volume of runoff to be expected from a given rainfall event that falls over the area.

Answer 14

Watershed or Basin

Question 15

It is the loci of points (the ridge line) that separates two adjacent watersheds, which then drain into two different outlets.

Answer 15

Watershed divide

Question 16

It is used to determine directions of surface runoffs.

Answer 16

Topographic divide

Question 17

TRUE OR FALSE
Runoff originates at higher elevations and moves toward lower elevations in a direction perpendicular to the contour lines

Answer 17

TRUE

Question 18

This term is sometimes used synonymously for just the surface portion of the watershed.

Answer 18

Catchment

Question 19

The flow of water through the surface of the soil.

Answer 19

Direct Runoff

Question 20

It is the basic hydrologic unit which all measurements, calculations, and predictions are made in hydrology.

Answer 20

Watershed

Question 21

The simplest system. Confined on all four sides with a single outlet.

Answer 21

Impervious inclined plane