Urban Stormwater Management

urban-stormwater-management

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440418

block

Four factors affecting sewer pipe roughness

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Ageing
Sediment

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Difficult to determine the effect due to difficulty in relating time and nature of deposit history, but almost all stormawater sewers likely to contain some depsoits even is only held in temporary storage during passage throught the sewerage system. Important effect on calculated flow capacity; value should be based on inspection if possible.
Very little information know, but some testing shows it is on the same order as new pipes

443715

none

What is this equation?

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The equation is called:

tc =

in units of

ie =

in units of

L =

in units of

Also, the ie =

where C is

and i is

as given by the IFD curve. Since IFD is related to the storm duration (=tc) need to solve the two equations simultaneously.

Peak runoff is then calculated using either

Where Qp is in

A in

i or ie in

mm/hr

440420

none

Inflow and infiltration on combined systems

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Number of effects including; increased risk of

, more frequent operation of

greater capital and running costs of

and

439899

none

Fill blanks

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The Rational Method is based on the idea that every

has a

that is the time taken for flow to reach the point of design from the

on the catchment. Peak discharge assumed to occur when the

contributes to the flow.

Statistical properties of the average rainfall intensity are transferred without modification to the

439903

none

Manholes used for

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Used at

and

, intersection and sharing of

, also access for

and

and in an emergency,

if there are

440429

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Combined sewer overflows

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Discharge of combined sewer overflow to natural water courses can lead to

caused by toxitity to ammonia and other chemicals, and

of watercourse banks with

439902

none

Fill blanks

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Rational method is confined to design of

with diameter of outfall less than

and area does not exceed

Hydrograph method is used for

schemes and where an

is needed. Takes into account that large catchments are unlikely to have a storm cover all of it, there may be some storm development, etc.

439900

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Match

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Match the text
Qp
K
i
A
Qp

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m3/s
KCi*A
ha
1/360
mm/hr

439905

none

Rational method typically sets storm duration to be equal to time of concentration. Hydrograph method with variable intensity sotrm usually has maximum discharge when duration is LARGER than time of concentration

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439901

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Hydrograph method

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q1 = C

*A1.

q2 = C*

*A2 + C*

*A1.

q3 = Ci1*A3 + Ci2*A2 + Ci3*A1.

Typical Storm Methods; combination of incremental

profile and incremental

diagram. Successive time increments are i1, i2, i3

439904

none

Major rainfall parameters regarding storm intensities or profiles

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Match the Text
1
2
3
4
5
6

Click and drag
Design storm duration
Areal reduction factor
Smoothing of paint rainfall profile
Design return period
Shape of storm profile
Total depth of rainfall

439898

none

Fill in blanks

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Need to consider duration of rainfall because there is an

between

and

. Two types of flood estimation are applied: those which only provide the

and those which also give the

. Need to consider the

of the total volume of

that appears as runoff.

440428

none

Infiltration and inflow

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Infiltration
Inflow
Combined systems
Separate systems
Assessing inflow during new design/upgrade works
Assessing infiltration during new design/upgrade works

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Does not significantly affect peak flows, less obvious effect, but should be taken into accoun when designing storage ponds.
Groundwater entering a sewerage system through pipe joints, broken pipes and manholes.
Infiltration and inflow can be many times the normal flow.
Inspection or measurement - Should be allowed for in the design as a base flow
Surface runoff from areas not intended to drain to the system; produces the more rapid response to rainfall.
May need to increase the assumed impermeable area after assessment.

439894

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Three types of urban sewers

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439897

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New systems can't be determined from flow records because

will

over time. Therefore,

are used instead in conjunction with

of the catchment draining to the system. Therefore design consists of converting a

into

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Urban Stormwater Management

Question 1 of 1

Time Left

Four factors affecting sewer pipe roughness

Match the text (click and drag)

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Ageing

Sediment

Very little information know, but some testing shows it is on the same order as new pipes

What is this equation?

Fill in the blanks

(0/0)

Inflow and infiltration on combined systems

Fill in the blanks

(0/0)

Fill blanks

Fill in the blanks

(0/0)

Manholes used for

Fill in the blanks

(0/0)

Combined sewer overflows

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(0/0)

Fill blanks

Fill in the blanks

(0/0)

Match

Match the text (click and drag)

(0/0)

Qp

K

i

A

Qp

m3/s

K*C*i*A

ha

1/360

mm/hr

Rational method typically sets storm duration to be equal to time of concentration. Hydrograph method with variable intensity sotrm usually has maximum discharge when duration is LARGER than time of concentration

Select the correct answer(s).

(0/0)

Hydrograph method

Fill in the blanks

(0/0)

Major rainfall parameters regarding storm intensities or profiles

Match the text (click and drag)

(0/0)

1

2

3

4

5

6

Design storm duration

Areal reduction factor

Smoothing of paint rainfall profile

Design return period

Shape of storm profile

Total depth of rainfall

Fill in blanks

Fill in the blanks

(0/0)

Infiltration and inflow

Match the text (click and drag)

(0/0)

Infiltration

Inflow

Combined systems

Separate systems

Assessing inflow during new design/upgrade works

Assessing infiltration during new design/upgrade works

Does not significantly affect peak flows, less obvious effect, but should be taken into accoun when designing storage ponds.

Groundwater entering a sewerage system through pipe joints, broken pipes and manholes.

Infiltration and inflow can be many times the normal flow.

Inspection or measurement - Should be allowed for in the design as a base flow

Surface runoff from areas not intended to drain to the system; produces the more rapid response to rainfall.

May need to increase the assumed impermeable area after assessment.

Three types of urban sewers

KCi*A