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Stormwater quiz TR-55 CORRECT 100%
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SCS - ANSWERSoil Conservation Service. Promoted control and prevention of soil erosion: issued TR-55 Was TR-55 method designed to describe flows in drainage areas with a significant portion of flow within stormwater sewers? - ANSWERNo, TR-55 is based on open and unconfined flow over land or in c...

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  • October 26, 2024
  • 2
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • stormwater quiz tr 55 correct 100
  • stormwater quiz tr 55 stuvia 2024
  • scs answersoil conservation service promoted c

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Stormwater quiz TR-55 CORRECT
100%
SCS - ANSWERSoil Conservation Service. Promoted control and prevention of soil erosion: issued TR-
55



Was TR-55 method designed to describe flows in drainage areas with a significant portion of flow
within stormwater sewers? - ANSWERNo, TR-55 is based on open and unconfined flow over land or
in channels



What is the key characteristic used to categorize soils into HSG - ANSWERminimum infiltration rate



What assumptions about the connectivity of imperviousness are used to develop CN values -
ANSWERAssume they are directly connected to the drainage system



Identify the variables in SCS runoff equation - ANSWERQ (runoff), P (rainfall), S(potential max
retention after runoff begins) and Ia (initial abstraction)



What are the units for Q in the SCS runoff equation - ANSWERin



What factors affect the curve number - ANSWERHydrologic soil group (HSG), Cover type, treatment,
hydrologic condition, antecedent runoff condition (ARC), connectivity of areas



What does 'treatment' mean with respect to the CN - ANSWERA cover type modifier to describe the
management of cultivated agricultural lands



Does runoff increase or decrease as CN increases - ANSWERincrease



What key factors affect the time of concentration (time for runoff to travel from the hydraulically
most distant point of the watershed to a point of interest)? - ANSWERSurface roughness, channel
shape and flow patterns, slope

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