3. Runoff and Hydrograph

Question 1

A graph showing the discharge versus yime past a specific point in river, channel or conduit carrying flow

Answer 1

Hydrograph

Question 2

Plot of discharge over time

Answer 2

Hydrograph

Question 3

Rainfall excess reaches the mainstream through ___ and ___

Answer 3

Overland and Channel flows

Question 4

Normal discharge of the river, stream or channel also known as Groundwater runoff

Answer 4

Base flow

Question 5

Volume of water reaching the river from surface runoff

Answer 5

Direct runoff

Question 6

Also known as Surface runoff

Answer 6

Direct runoff

Question 7

Called subsurface runoff

Answer 7

Interflow

Question 8

Volume of water reaching the river through the soil or underlying rocks

Answer 8

Interflow

Question 9

Difference between peak rainfall and peak discharge

Answer 9

Lag time

Question 10

Height at which a flood could occur - variable from river to river

Answer 10

Bankfull discharge

Question 11

How much water is in the river

Answer 11

Discharge line

Question 12

Determined by topographic map

Answer 12

Drainage area

Question 13

Length of perennial channels divided by drainage area

Answer 13

Drainage density

Question 14

Also known as concentration curve

Answer 14

Rising limb

Question 15

Represent the increase of discharge due to gradual build up of storage in channel over the catchment area

Answer 15

Rising limb

Question 16

Inflection point on rising limb to falling limb

Answer 16

Crest segment

Question 17

Indicates the peak flow or the maximum amount of flow at basin outlet

Answer 17

Crest Segment

Question 18

From the point of inflect at the end of crest segment to base flow

Answer 18

Falling limb

Question 19

Inflection point, represent the time at which the rain stopped

Answer 19

Falling limb

Question 20

A simple method to estimate peak flow of runoff

Answer 20

Rational method

Question 21

The time required by the water to flow from the most remote point to the mouth of the watershed once the soil has become saturated and minor depression filled

Answer 21

Time of concentration

Question 22

It is influenced mainly by the length of flow and flow slope gradient

Answer 22

Time of Concentration

Question 23

The ratio of the peak runoff to the rainfall intensity

Answer 23

Runoff coefficient

Question 24

It is develops for uniform rainfall using triangular hydrographs

Answer 24

Soil conservation service method

Question 25

In SCS Q means__

Answer 25

Runoff depth

Question 26

In SCS D means___

Answer 26

Duration of excess rainfall

Question 27

Lowest runoff potential

Answer 27

Soil A

Question 28

Moderately low runoff potential

Answer 28

Soil B

Question 29

Moderately high runoff potential

Answer 29

Soil C

Question 30

Highest runoff potential

Answer 30

Soil D

Question 31

Includes deep sands with very little silt and clay

Answer 31

Soil A

Question 32

Mostly sandy soil less depth that A

Answer 32

Soil B

Question 33

Comprising shallow soils and soil containing considerable clay and colloids

Answer 33

Soil C

Question 34

Includes mostly clay of high swelling percent

Answer 34

Soil D