Question

25. A single-stage outlet is so called because it allows water to flow through ____ opening(s).

a.	one	c.	three
b.	two	d.	four

                                                                 

   26.   What is the calculation called for a series of hypothetical water levels in an impoundment and their corresponding discharge through an orifice?

a.	single-stage outlet	c.	discharge rating
b.	impoundment	d.	berm

   27.   A rainfall event that exceeds the design storm rainfall could ____.

a.	drain out the main outlet
b.	cause the impoundment level to exceed maximum elevation
c.	damage the outlets
d.	decrease the impoundment level

   28.   What is the term for computing the outflow hydrograph when the inflow hydrograph is known?

a.	attenuation	c.	continuity
b.	routing	d.	Kinematic Wave Method

   22.   An important environmental consideration to culvert design is ____.

a.	type of soil	c.	existing culverts
b.	fish habitat	d.	apron lining

   23.   What is an advantage of designing a new culvert over replacing an old culvert?

a.	fewer existing streams	c.	only outlet control
b.	fewer existing constraints	d.	previously existing utilities

  24.Volume for underground detention basins is computed using which method?

a.	elevation-area method	c.	end-area elevation method
b.	average end-area method	d.	average method

Answer 1

25)Option a

The name itself suggests that it has single depth for water flow through one single opening.

26)Option c

Discharge rating of the outlet means calculations for a series of hypothetical water levels in an impoundment and their corresponding discharge through an orifice. It is a part of detention basin calculations.

27)Option c

The impounding level is the storage level of the reservoir which is used when rainfall is not sufficient for the stream requirement. Hence option b and d are incorrect.

The correct answer should be Option c

28)Option b

The term flood routing refers to procedures to determine the outflow hydrograph at a point downstream in a river (or
reservoir) as a function of the inflow hydrograph at a point upstream.