Unit 3 Learning Check NFIP

Question 1

as directed by the national flood insurance act of 1968, FEMA conducts flood studies in order to determine __ and ___

Answer 1

floodprone areas

flood risk zones

Question 2

the base flood is a flood that has a ___ risk of occurring in any year

Answer 2

1% chance

Question 3

the base flood is also called the ___ year flood

Answer 3

100

Question 4

True or False: a 100 year flood will occur only once every 100 years

Answer 4

false

Question 5

True or False: a 100 year flood could occur two times in a year

Answer 5

true

Question 6

True or False: the 100 year flood might not occur in a 200 year period

Answer 6

true

Question 7

True or False: the base flood could occur two consecutive years in a row

Answer 7

true

Question 8

on NFIP maps, the 100 year floodplain is called the ____

Answer 8

special flood hazard area

Question 9

BFE is the acronym for

Answer 9

base flood elevation

Question 10

what are the components of a flood insurance study

Answer 10

FIS - flood insurance study report

FIRM - flood insurance rate map

the flood boundary and flood way map - included in studies prepared before 1986 (after 1986, floodway shown on FIRM)

Question 11

for purposes of a riverine flood study, ___ is the study of the distribution and circulation of water in the environment, and ____ is the study of fluids in motion and how water with flow through the channel

Answer 11

hydrology

hydraulics

Question 12

the rate at which runoff flows downstream is called the flood ___

Answer 12

discharge

Question 13

what probable effect does an increase in urbanization within a community or upstream of it have on the stream discharges within that community

Answer 13

stream discharges usually will increase as a consequence to the increase in urbanization within the community or upstream of it

Question 14

what consequence of flood water level of a stream would usually occur when the bridge is constructed over a stream

Answer 14

a hydraulic analysis is always required to determine the effect of any bridge construction over a stream. however, construction over a stream is considered an obstruction to the food and therefore may increase flood water level upstream of the construction

Question 15

to locate the true elevations at a site, surveyors have established ___ marks also known as ____ marks

Answer 15

elevation reference

bench

Question 16

cross sections describe the ___ of the floodplain

Answer 16

shape

Question 17

what is the datum used for your communities flood insurance study, FIRM, and profile

Answer 17

check legend or key to FIRM

Question 18

flood profiles are developed by plotting the flood elevations at the ___ and connecting the plotted points

Answer 18

cross sections

Question 19

to make a floodplain map, the base flood elevations are plotted ona ___ map or a ____ map

Answer 19

topographic

contour

Question 20

the ___ is defined as the stream channel and that portion of the adjacent floodplain that must remain open to permit passage of the base flood

Answer 20

floodway

Question 21

a floodway analysis conducted to the minimum NFIP standard allows the fringe to be obstructed until the base flood level is increased by how much?

Answer 21

1 foot

Question 22

what causes a storm surge

Answer 22

storms that bring air pressure changes and strong winds that pile water up against the shore

Question 23

what is wave runup

Answer 23

when waves hit the shore, water moved with such force that it keeps traveling inland higher than the still water flood level

Question 24

instead of cross sections, coastal flood engineers survey __

Answer 24

transects

Question 25

the BFE for coastal studies are the ___ plus the ___

Answer 25

stillwater elevations wave runup

Question 26

the most hazardous part of the coastal floodplain is the ____ area, which is shown on the map as a ___

Answer 26

coastal high hazard area V

Question 27

what differentiates shallow flooding from riverine flooding

Answer 27

shallow is different from riverine or coastal because it occurs in areas where there is no channel or identifiable flow path

Question 28

flood studies that do not identify BFE are called __

Answer 28

approximate studies

Question 29

prior to 1986, the maps published with an FIS are the ___ and the ___. since 1986, the map published with an FIS are the ___

Answer 29

old format FIRM, or FHBM, or floodway map new format FIRM FIRM map - flat or z fold

Question 30

what does an elevation reference mark look like on a FIRM

Answer 30

locations are identified with a small x and the designation ERM or RM followed by a number

Question 31

what is an AO zone

Answer 31

area subject to sheet flood, ponding, or shallow flooding

Question 32

what is the FIRM effective date for your community

Answer 32

date of the first FIRM for your community the date determines whether building is pre FIRM or post FIRM

Question 33

how is a floodway shown on the flood boundary and floodway map

Answer 33

it is the white area adjacent to and including the channel

Question 34

how is a floodway shown on the new format FIRM

Answer 34

shaded areas with diagonal lines

Question 35

a zone C on an old format FIRM is shown as a zone ___ on the new format FIRM

Answer 35

zone X

Question 36

CBRA is an acronym for what

Answer 36

coastal barriers resource act

Question 37

what communities floodplains are shown on the countrywide FIRM

Answer 37

all the communities in the country, even those not currently in the NFIP

Question 38

floodways are shown along the ___ toe of a levee on the FIRM

Answer 38

landslide

Question 39

areas behind recognized levees are designated as

Answer 39

shaded zone X

Question 40

the base flood elevation is the elevation of the ___ year flood or the ___ % annual chance flood

Answer 40

100 1

Question 41

the special flood hazard area or SFHA is how the ___ floodplain is shown on FEMA maps

Answer 41

base flood

Question 42

the SFHA is shown on a FIRM as a zone that begins with the letter __ or __

Answer 42

A V

Question 43

what are the components of a flood insurance study

Answer 43

flood insurance study report flood insurance rate map flood boundary and floodway map for studies pre 1986. after 1986, floodway is on FIRM and no separate maps

Question 44

___ is the study of the watershed behaviour during and after a storm

Answer 44

hydrology

Question 45

surveyors reference elevation to a common

Answer 45

datum

Question 46

most permanent FIS elevatoin reference marks are referenced to what datum

Answer 46

national geodetic vertical datum (NVGD)

Question 47

a hydraulic study uses hydrology, cross section information, and stream characteristics to determine the flood

Answer 47

elevations (and velocities and floodplain widths)

Question 48

cross sections are shown on which map

Answer 48

floodway map - new format FRIM

Question 49

flood profiles are used to determine what

Answer 49

flood elevations along a river or stream between cross sections

Question 50

in riverine situations, the floodplain is divided into two separate parts for the floodplain management purposes. these parts are ___ and ___

Answer 50

floodway flood fringe

Question 51

based on the minimum NFIP standard, if the flood fringe were completely filled, how high could the base flood elevation go up

Answer 51

1 foot

Question 52

what FIRM zone has wave heights greater than 3 feet

Answer 52

V zone

Question 53

instead of using a base flood elevation, some shallow flooding areas are defined use a base flood ___

Answer 53

depth

Question 54

an approximate study shows the base ___ but does not show the base flood ___

Answer 54

floodplain elevation

Question 55

how many digits are there in the NFIP community identification number

Answer 55

6 digits FIRM has 5 digit county wide community identification number does not include panel number and other numbers near it on the FIRM title block

Question 56

what is an AH zone

Answer 56

shallow flooding base floodplain with base flood elevations

Question 57

what was the problem with the way the floodway was shown on the old format flood boundary and floodway maps

Answer 57

white area looked like it was a C zone outside of the floodplain. if people only had FIRM, they did not know of the floodway hazard

Question 58

the new format FIRM includes

Answer 58

floodways and floodplain management information simplified flood insurance management information simplified flood insurance zones

Question 59

do Q3 flood data show base flood elevations if available

Answer 59

no. they primarily determine if a property is in or out of the SFHA