STORM TEST 3 EXAM QUESTIONS
WITH VERIFIED ANSWERS. A+ GRADE
2025/2026.
True or false: urban growth trees were found to typically have larger and more effective
canopies for intercepting rainfall than forest grown trees - ANS true
which type of tree - deciduous or evergreen - was shown to be more effective at rainfall
interception regardless of region? - ANS evergreen
in which region - southeast of pacific northwest - was a higher percentage of precipitation
captured by tree canopies? - ANS pacific northwest
if you were calculating runoff using the rational formula, which variable (C,I, or A) would best
describe the impact of tree canopies on runoff based on the article "Give Me the Numbers"? -
ANS I
What does LID stand for? - ANS low impact development
What two major components make up the Lh for a watershed? - ANS overland flow and
channel flow
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
,In the storm water runoff hydrograph, the point at the top of the curve (N) represents: -
ANS peak runoff rate and time of peak
the shaded area beneath the curve on the hydrograph represents: - ANS Qvol
The two portions of this stream hydrograph identified at top and bottom of curves repectively: -
ANS base flow; storm flow
true or false: infiltration is the primary hydrologic process supporting stream base flow -
ANS true
true or false: runoff on a slop typically flows downhill perpendicular to the contours -
ANS true
true or false: the rational formula is most appropriate for use in relatively small watersheds
because inherent model error becomes excessive as the watershed are gets larger - ANS true
determining Qvol is an essential hydrologic modeling practice because it allows the designer to:
- ANS size storage areas appropriately
why did teague and kuehler's research show that trees in the NW capture and retain more
rainfall than trees in the SE? - ANS rainfall events in the NW are less intense than in SE
a slope of 6% is equivalent to a ratio of: - ANS 16.67H:1V
a depression pond is proposed. what is the mose correct point for the at-grade overflow? -
ANS the lowest point within the water limits
in the article "Give Me the Numbers", when comparing comparably sized trees, what kinds of
trees were most effective at capturing and retaining rainfall volume in the canopy? -
ANS conifers
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
, true or false: creating an impervious area on a site will typically increase both Qp and Qvol. -
ANS false
along the centerline of a gradually descending roadway, the 426 contour is 135' away from the
420 contour. the gradient of the road is: - ANS D=L/G
G=L/D
G= 6/135
G=.044 = 4.44%
true or false: the faster the time of concentration, the lower the intensity. - ANS false
true or false: Teague and Kuehler's research found that the typical forest frown tree most
commonly has a more effective canopy for rainwater capture than the typical urban tree -
ANS false
a co-worker of yours calculated before-development and after-development site stormwater
runoff using the rational formula and also SCS method for an 18-acre watershed. he carefully
followed the procedures you have learned. based on the results, which finding is most correct?
- ANS both are equally correct even with different results
the LH for a watershed includes 1,800 feet of a mountain stream. if the channel drops 20 feet
over that distance, approximately how long will it take water to travel that distance (rounding
to the nearest minute) - ANS 14 mins - use figure 11.4 (nomograph for channel flow time)
true or false: given equal lengths and slope of flow, overland flow is typically faster than
channel flow - ANS false
both the FAA formula for calculating the time of concentration and the SCS method for
calculating the time of concentration rely on what criticl information? - ANS slope, land
surface characteristics, LH length
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
WITH VERIFIED ANSWERS. A+ GRADE
2025/2026.
True or false: urban growth trees were found to typically have larger and more effective
canopies for intercepting rainfall than forest grown trees - ANS true
which type of tree - deciduous or evergreen - was shown to be more effective at rainfall
interception regardless of region? - ANS evergreen
in which region - southeast of pacific northwest - was a higher percentage of precipitation
captured by tree canopies? - ANS pacific northwest
if you were calculating runoff using the rational formula, which variable (C,I, or A) would best
describe the impact of tree canopies on runoff based on the article "Give Me the Numbers"? -
ANS I
What does LID stand for? - ANS low impact development
What two major components make up the Lh for a watershed? - ANS overland flow and
channel flow
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
,In the storm water runoff hydrograph, the point at the top of the curve (N) represents: -
ANS peak runoff rate and time of peak
the shaded area beneath the curve on the hydrograph represents: - ANS Qvol
The two portions of this stream hydrograph identified at top and bottom of curves repectively: -
ANS base flow; storm flow
true or false: infiltration is the primary hydrologic process supporting stream base flow -
ANS true
true or false: runoff on a slop typically flows downhill perpendicular to the contours -
ANS true
true or false: the rational formula is most appropriate for use in relatively small watersheds
because inherent model error becomes excessive as the watershed are gets larger - ANS true
determining Qvol is an essential hydrologic modeling practice because it allows the designer to:
- ANS size storage areas appropriately
why did teague and kuehler's research show that trees in the NW capture and retain more
rainfall than trees in the SE? - ANS rainfall events in the NW are less intense than in SE
a slope of 6% is equivalent to a ratio of: - ANS 16.67H:1V
a depression pond is proposed. what is the mose correct point for the at-grade overflow? -
ANS the lowest point within the water limits
in the article "Give Me the Numbers", when comparing comparably sized trees, what kinds of
trees were most effective at capturing and retaining rainfall volume in the canopy? -
ANS conifers
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
, true or false: creating an impervious area on a site will typically increase both Qp and Qvol. -
ANS false
along the centerline of a gradually descending roadway, the 426 contour is 135' away from the
420 contour. the gradient of the road is: - ANS D=L/G
G=L/D
G= 6/135
G=.044 = 4.44%
true or false: the faster the time of concentration, the lower the intensity. - ANS false
true or false: Teague and Kuehler's research found that the typical forest frown tree most
commonly has a more effective canopy for rainwater capture than the typical urban tree -
ANS false
a co-worker of yours calculated before-development and after-development site stormwater
runoff using the rational formula and also SCS method for an 18-acre watershed. he carefully
followed the procedures you have learned. based on the results, which finding is most correct?
- ANS both are equally correct even with different results
the LH for a watershed includes 1,800 feet of a mountain stream. if the channel drops 20 feet
over that distance, approximately how long will it take water to travel that distance (rounding
to the nearest minute) - ANS 14 mins - use figure 11.4 (nomograph for channel flow time)
true or false: given equal lengths and slope of flow, overland flow is typically faster than
channel flow - ANS false
both the FAA formula for calculating the time of concentration and the SCS method for
calculating the time of concentration rely on what criticl information? - ANS slope, land
surface characteristics, LH length
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
