Stormwaterdetention basins thatare designed

Question 1: Stormwaterdetention
basins thatare designed
to reduce
a100-yearpostdevelopment flow to a 100-year
predevelopment flow, willpreventdownstreamflooding
fromallstorms
with
return periods of
less than100 years.

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True or False

Question 8 Over the years, waterqualityprotection
efforts under the Clean
WaterActhave
moved
from technology-
based pointsource approaches to a more comprehensive watershed approach,
triggered in
large
partbythe increased
need to engage and involve stakeholders
at
the grassroots level.

True or False

Question 10:
Manyexisting
detention basins were
traditionallydesigned
for
waterquantitycontrolbyreducing
post- developmentpeak
flows
for
a specific design stormdown to
the predevelopmentpeak flow for the
same
design storm.

True or False

Question 11:
Downgrading of
designated usesofa
waterbodyis allowed when
human-caused impacts cannotbe remedied.

True or False

Question 12:
Most localordinances when referring
to predevelopmentconditions
as the
goalto match surface water flows, theyare
actuallyreferring to
existing conditions, which maybe partiallydeveloped.

True or False

Question 15:
The Flood Insurance Programis
limited
because itstillallows filland development in floodplains
(flood fringes) right
up to the floodwayboundaries.

True or False

Question 16:
Alow impactdevelopment is
designed
to mimic the
predevelopmenthydrologic
conditions through control
of runoffvolume, peak runoff rate, flow frequency/duration, and waterquality.

True or False

Question 17:
In general,
a plan to manage stormwater froma newdevelopmentshould be established
afterstream restoration techniqueshave been employed or
implemented in
the watershed.

True or False

Question 18:
Astormwatermanagement facilitythatcaptures the firstone-half to
one inch ofsurface runoff results in

“cleaner”outfallordischarge.

True or False

Question 19:
Acombination of
on-site and regionaldetention basins
can significantlyimprove the
capabilityof developers and
communities to manage stormwateron a watershed basis.

True or False

Question 20:
Allowable release
rate
is the
ratio
ofsurface runoffcontributing
to a pointof interestat thatpoint’s time- of-peak to
the maximumsurface runoff rate forpost-developmentconditions.

True or False

Question 22:
Adaptive management involvesan iterative planning process in
which
lessons learned
fromearlier managementefforts are
incorporated in
subsequentefforts

True or False

Question 23:
Land developers and
communitiesmustimplementcontainmentof floodplains
in order to permanently reduce
the frequencyand occurrence
ofdevastating floods.

True or False

Question 24:
The basic premiseof the programunderSection
404 of the FederalClean
WaterAct is thatno discharge
of dredge or fillmaterials
into
waters of
the United Statesmaybe
permitted ifa practicable alternative
exists
that is less damaging
to the
aquatic environment, or
if the nation’s waters
would
be significantlydegraded.

True or False

Part II:Multiple Choice Questions (1
point each).

Instructions:ChooseeitherA,
B, C, orD(onlyone
answer)aftereach
of the following questions.

Question 27:
Which of the following
statements
is a
characteristic
ofstructuralstreamrestoration
techniques?

A. Theycause water to
flow fast therebydestroying
disease causing
organisms (like mosquitoes) and aquatic habitats.

B.
Theyprovide recreationaland
fishing areas free of
pollutants.

C. Theypreventstreambank
erosion byforcing water to
flow toward the
centerof the channel.

D. A, B and C above.

A, B, C, or D:

Question 28:
Which of the following
parameters cannotbe effectivelyused
to assesspollution vulnerabilityof
groundwater resource?

A. Pathogen orbacteria type.

B. Glacialdeposits
and bedrock type.

C. Topographyorslope.

D. Soil types.

A, B, C, or D:

Question 29:
In the United States,
the NationalFlood Insurance Program:

A. Providescomprehensive
floodplain managementand protection of
riparian buffers.

B.
Offers support through
providing
flood insurance and minimizing future
damage.

C. Prevents non-pointsource pollutants fromwashing
into
waterways
during floods.

D. A, B, and C above.

A, B, C, or D:

Question 31:
Ariparian buffermanagementplan
should be an integralpartofanywatershed managementplan and should divide
the buffer into the
following zones,
except:

A. Azone thatmaintains
stable ecosystem, enablesnutrient removaland
prevents streambank erosion.

B. Azone thatprevents infiltration
while
allowing stormwaterorsurface runoff to
move
fast without causing erosion.

C. Azone thatcontains
aporous grass-covered
land, which allows maximuminfiltration
ofsurface runoff.

D. Azone thathasvegetation
that removessediments
and otherpollutants through filtration.

A, B, C, or D:

Question 32:
Generally, in
riparian buffermanagement,
asstreams increase
in size, the relative
value
of riparian buffers on:

A. Nutrient removaldecreases.

B.
Sedimentcontrol remains
constant.

C. Water temperature moderation
decreases.

D. A,B, and C above.

A, B, C, or D:

Question 35:
Which of the following
statements
is nota valid reason as
to whya floodplain
managementplan mustbe included in
a comprehensive watershed managementplan?

A. It is less
expensive than constructing large flood
controlprojects.

B. To increase water front realestate
orpropertyvalues.

C. To improve
and maintain waterquality.

D. To preserve
the storage capacityofexisting
floodplains.

A, B, C, or D:

Question 37:
The conceptofvariable
stormwatermanagementdistrictdoesnotclassifythe watershed into:

A. Regionaldetention district.B.
Standard detention district.C. Alternative
stormdistrict.

D. Waterqualityand recharge onlydistrict.

A, B, C, or D:

Question 38:
Which of the following
statements
is notan environmentalbenefitof watershed
managementplanning?

A. Protects wildlife
habitat.

B.
Improvesmanagementofpermitting programs.

C. Improvesqualityofdrinking waterand
recreationaluse.
D. Controls
flooding byrestoring riparian and wetland areas.A, B, C, or D:

Question 39:
Which of the following
is nota nonstructuralstormwaterbestmanagementpractice?

A. Generalcommunityoutreach.

B.
Porous asphaltpavement.

C. Notbuilding
in floodplains.

D. Preservation of
environmentallysensitive areas.

A, B, C, or D:

Question 40:
In groundwatermanagement, overdraftoccurs when
groundwater is removed
faster than recharge can replace it.
Which of the following
is nota resultofgroundwateroverdraft?

A. Apermanentlossofa
portion of its storage capacity.

B. Achange thatcan
cause waterofunusable
qualityto
contaminate good water.

C. In coastalbasins,
salt-water intrusion
can occur.

D. Permanentflooding
ofcoastalzones.

A, B, C, or D:

Question 46:
Abusinessman has
80 hectaresofundeveloped forest land thathe wants to
develop into eithera golf
courseora shopping
center/commercialarea. In
his evaluation
and analysis ofstormwatermanagement options,
he found that in the area,
rainfall intensityofa 25-yearstormwith
a duration of20 minutes is
2.5 inchesperhour;Rational
RunoffCoefficient (AMC II)under
Hydrologic
SoilGroup B for: (i)a shopping center/commercialarea
with
85% impervious
surface
area is 0.90;and (ii)a
golfcourse with good grass coveron
75%ormore of
the area is 0.25.

(a)Using the
RationalMethod, whatare the
peak surface runoffdischarges
fromeach land use?(8
points).

(i)Golf
Course Area:

(ii) Shopping Center/
Commercial Area:

(b) Based
on theresultsofyour calculationsabove,
which
land usewould you
recommend to the developer to
choosein order
to minimizemajor stormwater
floodingproblemsdownstream
ofhis property? Why?(4
points).

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