©BRIGHTSTARS 2025 ALL RIGHTS RESERVED 11:22 AM A+
FE Civil Hydrology Exam Questions And
Answers |Latest 2025 | Guaranteed Pass.
Total Percipitation equation - Answer✔Total percipitation=initial
abstraction+infiltration+surface runoff
Damage categorization of floods - Answer✔Nuisance, damaging, and devastating
Parameter required to design culverts and storm drains - Answer✔Peak runoff
Rational Method equation - Answer✔Q=CIA
Q=Peak runoff (in-ac/hr or cu.ft/s)
C=runoff coefficient
I=rainfall intensity (in/hr)
A=area (acres)
Rational method assumptions - Answer✔Constant rainfall
Recurrence interval for peak flow is same as for design storm
Runoff coeff is constant
Usage of method only valid for small areas
NRCS rainfall runoff method equation - Answer✔Q=(P-0.2S)^2/(P+0.8S)
1|P a g e
, ©BRIGHTSTARS 2025 ALL RIGHTS RESERVED 11:22 AM A+
Q=total runoff (in)
P=gross rain (in)
S=storage capacity (in)
NRCS rainfall runoff method assumptions - Answer✔Exponential decay of infiltration
Losses from interception, storm period evap, depression storage, infiltration assumed 20% of
storage area
Conservation equation - Answer✔Q=Av
Q=flow
A=area
v=velocity
Bernoulli's Equation parameters - Answer✔Pressure energy + kinetic energy + potential energy
*Does not take into account friction losses
Energy conservation equation - Answer✔Same as Bernoulli's Equation but friction flows are
considered in equation
Hydraulic radius equation - Answer✔Cross sectional area / wetted perimeter
Manning's Equation - Answer✔Equation used to estimate velocity of flow in open channel
v=(K/n)Rh^(2/3)S^(1/2)
Hazen-Williams Equation - Answer✔Equation commonly used to find flow velocity in circular
pipes flowing less than full
v=kCRh^(0.63)S^(0.54)
2|P a g e
FE Civil Hydrology Exam Questions And
Answers |Latest 2025 | Guaranteed Pass.
Total Percipitation equation - Answer✔Total percipitation=initial
abstraction+infiltration+surface runoff
Damage categorization of floods - Answer✔Nuisance, damaging, and devastating
Parameter required to design culverts and storm drains - Answer✔Peak runoff
Rational Method equation - Answer✔Q=CIA
Q=Peak runoff (in-ac/hr or cu.ft/s)
C=runoff coefficient
I=rainfall intensity (in/hr)
A=area (acres)
Rational method assumptions - Answer✔Constant rainfall
Recurrence interval for peak flow is same as for design storm
Runoff coeff is constant
Usage of method only valid for small areas
NRCS rainfall runoff method equation - Answer✔Q=(P-0.2S)^2/(P+0.8S)
1|P a g e
, ©BRIGHTSTARS 2025 ALL RIGHTS RESERVED 11:22 AM A+
Q=total runoff (in)
P=gross rain (in)
S=storage capacity (in)
NRCS rainfall runoff method assumptions - Answer✔Exponential decay of infiltration
Losses from interception, storm period evap, depression storage, infiltration assumed 20% of
storage area
Conservation equation - Answer✔Q=Av
Q=flow
A=area
v=velocity
Bernoulli's Equation parameters - Answer✔Pressure energy + kinetic energy + potential energy
*Does not take into account friction losses
Energy conservation equation - Answer✔Same as Bernoulli's Equation but friction flows are
considered in equation
Hydraulic radius equation - Answer✔Cross sectional area / wetted perimeter
Manning's Equation - Answer✔Equation used to estimate velocity of flow in open channel
v=(K/n)Rh^(2/3)S^(1/2)
Hazen-Williams Equation - Answer✔Equation commonly used to find flow velocity in circular
pipes flowing less than full
v=kCRh^(0.63)S^(0.54)
2|P a g e
