Quiz 6

Front 1

The older lobes of the Mississippi Delta were abandoned because:

Back 1

The Mississippi River found a steeper gradient

Front 2

The greatest percentage of sediment deposited in a prgrading delta is found in the:

Back 2

Foreset beds

Front 3

The process responsible for the greatest amount of land loss in coastal Louisiana is:

Back 3

Compaction and subsidence of sediement

Front 4

The competence of a stream refers to its:

Back 4

Ability to move a certain sized particle

Front 5

The lake created by a meander cutoff is termed:

Back 5

An oxbow lake

Front 6

The gradient of a stream that drops 10 feet over a horizontal distance of two miles is:

Back 6

5 feet per mile (feet divided by miles to get feet per mile)

Front 7

The most common drainage pattern near the mouth of a river is:

Back 7

Meandering

Front 8

The probability of a 10-year flood occurring three times in the same 12-month period is:

Back 8

.1%
The probability of a 10 year flood occurring in any given 12-month period is 1 divided by 10 (10 years is the Recurrence Interval), which equals 0.1. In order to obtain the probability of having that size event occur three times in the same period of time, multiply (0.1x0.1x0.1) x 100 = (0.001) x 100 = 0.1% Or, just raise 0.1 to the third power and multiply by 100.

Front 9

Cobble-sized particles are most likely to be transported as part of a stream's:

Back 9

Bed load

Front 10

The rating curve for a stream relates which of the following?

Back 10

Stream discharge to gage height

Front 11

The total area drained by a stream and its tributaries is called the:

Back 11

Drainage basin

Front 12

Hydraulic action, solution, and abrasion are all examples of:

Back 12

Stream erosion

Front 13

The probability that a flood having a recurrence interval of 71 years will occur in the next 12 months is:

Back 13

1.4%

Front 14

Braided streams:

Back 14

Are seasonally overloaded

Front 15

Sand bars deposited on the inner curve of a stream meander are called:

Back 15

Point bars.

Front 16

The average time between floods of a given magnitude is:

Back 16

The flood recurrence interval

Front 17

A particular stream has a 47-year record of peak discharges available on the Internet. What is the recurrence interval of the 4th-ranked flood in this record? (HINT: see Box 10.2, pp. 244-245 in the text)

Back 17

12 years.
From Box 10.2 on p. 244, one finds that the Recurrence Interval R is given by the equation R=n+1/m, where n = the number of years of record (47), and m=the flood rank (4).