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Flashcards in Surface Water Drainage Introduction Deck (64)
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1

The HydroChamber is what shape

Arched chamber

2

The catchpit manholes of the HydroChamber reduces what getting in?

Grit & silt

3

The HydroChamber is made from which material?

HDPE

4

Large diameter HDPE pipe stocked by JDP is supplied by which manufacturer?

Asset

5

The storage capacity of a crate is what percentage of its total volume?

95%

6

Which type of separator would most likely to be used under a car park?

Bypass

7

If a client asks for 300m³ of Storage what would be the required volume of the crates?

315m³

8

If a client asks for 100m³ of Storage what would be the required volume of the crates?

105m³

9

Which of these would not be acceptable for an adoptable storm water management system: Metal tank, GRP tank or Concrete tank?

Metal Tank

10

What do we mean by permeable land?

Land where rainwater can soak into the ground

11

Will stormwater reach a watercourse more quickly on permeable ground or on impermeable ground?

Impermeable ground

12

The process of storing stormwater in one location before releasing it into the ground in a controlled way is known as what?

Attenuation

13

What is meant by an adopted system?

A system which is maintained or will be maintained by the water authority.

14

An attenuation system is only required when developing a greenfield site. True or False?

FALSE

15

What percentage do you add to the surface area of an attenuation crate membrane for laps?

10%

16

Perforated coil is used is used as carrier pipe.True or False?

FALSE

17

Which type of land drainage layout would be used on a railway embankment?

Herringbone

18

Most farm land has never been drained. true or False

FALSE

19

Land drain coil is made from which material?

uPVC, HDPE, Polyethylene

20

Which of the following manufactures land drain coils: Acorn, Kingspan, Polypipe

Polypipe

21

In what lengths are 80mm land coil available?

25m, 50m and 100m

22

In what lengths are 60mm land coil available?

25m, 50m and 150m

23

In what lengths are 100mm land coil available?

25m, 50m and 100m

24

In what length is 200mm land coil available?

40m

25

In what length is 125mm land coil available?

75m

26

In what lengths are 160mm land coil available?

25m, 45m and 50m

27

Land coil can be recommended for septic tank drainage. True or False

FALSE

28

What type of bore does land drain have?

Ribbed

29

For what is the letters PPG4 an abbreviation ?

Planning Policy Guidelines 4

30

What is the minmum depth of cover at which that land drain should be installed?

450mm

31

What is the minimum depth of cover recommmended for 600 mm land drain?

450mm

32

Which of these customers would be most likely to use Kite Marked land drain - farmer or council?

Council

33

What is the minimum cover to a Graff crate in a non trafficked area?

300mm

34

What is the minimum cover to a Wavin or Polypipe crate in a non trafficked area?

500mm

35

What is the difference in the uses for a Highway Range and an Estate Range cover and frame from Peter Savage?

Highway Range is used in areas of constant traffic and Estate Range for occasional traffic

36

What size is a Wavin or Polypipe Crate?

1.0m x 0.5m x 0.4m

37

What size is a Graff Rainbox Crate?

1.2m x 0.6m x 0.42m

38

Twinwall can be used for a sewerage application . True or False?

FALSE

39

From what material is twinwall manufactured ?

HDPE

40

Twinwall is usually supplied in what lengths ?

6m

41

What is the OD of 150mm JFC twinwall ?

178mm

42

What is the OD of 225mm JFC twinwall ?

265mm

43

What is the OD of 300mm JFC twinwall ?

354mm

44

For what is TEPPFA an abbreviation?

The European Plastic Pipes & Fittings Association

45

What is the OD of 375mm JFC twinwall ?

426mm

46

What is the OD of 450mm JFC twinwall ?

512mm

47

What is the OD of 600mm JFC twinwall ?

680mm

48

What is the maximum depth that twinwall may be installed?

10m

49

Which manufactures supply Twinwall made from recycled materials?

JFC and Polypipe

50

What is the shallowest depth at which you can install twinwall ?

0.5m

51

For what do the letters HDPE stand?

High Density Polyethylene

52

How much does twinwall weigh in comparison to concrete ?

6%

53

JFC twinwall is made from what percentage of recycled materials ?

100%

54

Why is the inner wall of Twinwall smooth ?

To enable increased flow capacity.

55

When using twinwall on highway scheme, is it likely to require BBA approval ?

Yes

56

When using twinwall on farming project would it need to be BBA approved ?

No

57

How would you traditionally join twinwall pipe ?

Push fit coupling

58

Ridgidrain is the name for who's twinwall pipe ?

Polypipe

59

What colour is Ridgidrain internally ?

Blue

60

The Ridgidrain system was the first drainage product in the market to achieve what approval ?

HAPAS

61

For what is HAPAS an abbreviation?

Highway Authority Product Approval Scheme

62

Corripipe is the name for who's twinwall pipe ?

JFC

63

Which Naylor Twinwall does not have BBA approval

N Drain

64

How many seals would you need for a single socket twinwall pipe ?

1