figure 4-7: united utilities internal & external dg5

Warrington BC SFRA - Volume II - SFRA Technical Report - v3.0.doc 30

Figure 4-7 provides a spatial overview of DG5 records in Warrington BC aggregated to United Utilities drainage areas. These have been coloured to illustrate the total number of properties on the register as listed below.

Low - Less than 10 properties on internal register Medium - Less than 10 properties on internal register and some on external register High - Greater than 10 properties on internal register and some on external register

Figure 4-7: United Utilities Internal & External DG5 Records Map

© Crown copyright and database rights 2011 Ordnance Survey Warrington BC Licence No. 100022848

4.3.4 United Utilities Hydraulic Sewer Modelling

Sewers are generally designed to a 1 in 30-year design standard, which means sewer flooding will often be associated with larger events that are less frequent but have a higher consequence. In these situations, sewer inputs from the surrounding land will exceed the sewer system, discharge from manholes and flow across the surface of the land. Overland flows will therefore often follow the same flow paths and pond in the same areas as overland flows identified in the Environment Agency's national surface water maps.

As part of their ongoing drainage area programme, United Utilities have constructed hydraulic models of some of the main sewer systems through Warrington. A series of design storms representing rainfall events of different return periods (1, 2, 5, 10, 20 & 30-years) were applied to the models with the surcharging volume at individual model nodes recorded and supplied as a GIS layer.


Figure 4-8 illustrates the volume discharged (m³) by each manhole during the 1 in 30 year flood event at a strategic scale. Each manhole has been colour coded to indicate the total flood volume.

Whilst this map allows a high-level analysis of sewer flood risk to be made there are a number of limitations with the data that must be acknowledged. Firstly, not all sewer networks in Warrington have been modelled; those that are identify previous high-risk areas from other sources (fluvial and surface water). United Utilities have run all models available, although age and confidence in the models are unknown. Older models may be outdated because of sewer network improvements. The data, shown as it is, does not provide an illustration of which areas would be affected once the floodwater is discharged from the system only where the discharge would occur. For example, floodwater may flow down streets, through properties, nearby watercourses or simply re-enter the sewerage systems further downstream.

Figure 4-8: 1 in 30 years Sewer Flooding


4.3.5 Sewer Flooding Conclusion

Whilst the DG5, SIRS and WIRS registers can give an idea of those areas with limited drainage capacity, or are susceptible to blockage and may result in flooding to properties, gardens or highways, it must be acknowledged that they are purely a historical register of incidents or properties that have already been flooded. They do not provide the data required to assess the current risk of flooding.


Figure 4-9: Warrington Critical Drainage Areas


Table 4-2: Warrington Critical Drainage Areas

Drainage Area Comment

Burtonwood Burtonwood drainage area is located to the west of Warrington between the M62 and Great Sankey. Whilst flood risk within the drainage area is low, there is natural drainage south to Barrow Brook (Whittle Brook) or east to North Park Brook (Sankey Brook), which are both at high risk of flooding (and are themselves CDAs). This drainage area also includes the large development site of Omega. If development is unmanaged, surface water runoff/volume could increase risk downstream to areas that are already at risk of flooding.

Penketh The Penketh drainage area has been identified as a high risk area within Warrington. There are two main watercourses, Whittle Brook and Penketh Brook, which flow through this area, underneath the St Helens canal and outfall into the River Mersey. The downstream extent of both watercourses and contributing urban drainage system will be at risk of tidal locking during high tides. There are a significant number of historical flood events which fit well with both fluvial and surface water flood zones. Whilst this area has been subject to flood risk management schemes by United Utilities, reducing the risk to a standard 1 in 30 year standard of protection, the area will still be sensitive to any additional flows. Development may have to look at alternative connections other than the current surface water drainage systems. The Penketh area was the focus of the pilot SWMP. It is recommended that it is one of the hotspot areas for further assessment of any upcoming Warrington SWMP.


Figure 5-2: Bridgewater Canal Aqueduct and Stop Plank Locations


Table 5-2: Bridgewater Canal Breach Modelling Methodology

Task Approach Comment

Identify breach locations

Aqueducts listed above These are the only areas through Warrington in which the canal is raised

Calculate breach volume

Estimating the volume of water per impounded length using average depth and width

Impounded length is the distance either side of breach to the nearest stop log

Average depth of 1.25m Average width calculated using GIS

for each impounded length Create JFLOW model

Import breach location and potential discharge volume into JFLOW

The breach was using a standard hydrograph with the extents created every hour

There are a number of assumptions with the canal breach methodology.

Potential breaches are located at aqueducts and raised embankments. Unlike the HR Wallingford study, no structural condition assessment has been made on assets through Warrington to verify breach locations.

The MSCC work on canal risk is welcomed, as it starts to assign probabilities to the breach mechanisms. However, the SFRA does not attempt to calculate the probability of such events occurring, as this would be too detailed for this level of assessment and as such, the SFRA has adopted a more precautionary approach where data is uncertain.

The impounded length of the canal has been calculated using the first set of stop planks either side of the breach location. This is contrary to what was seen in the breach at Durham where the predefined stop plank locations could not be used because the velocities were too high, and so stop log locations were sought further away from the breach. However, due to the significant distances between stop plank

41 Hawthorne Street, Warrington

Flood Risk Assessment and Drainage Management Strategy

HYD157-41.HAWTHORNE.STREET-FRA&DMS

APPENDIX L: PRELIMINARY DRAINAGE STRATEGY PLAN

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APPENDIX M: TYPICAL SUDS DETAILS


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APPENDIX N: IMPERMEABLE AREAS PLAN


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9

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1

2

.

1

2

1

2

.

1

8

1

2

.

1

7

1

2

.

1

4

1

2

.

1

3

1

2

.

2

8

1

2

.

2

8

1

1

.

9

1

1

1

.

9

8

1

2

.

0

8

1

2

.

0

7

1

2

.

0

0

1

2

.

0

2

1

2

.

0

7

1

2

.

0

4

1

2

.

1

0

1

2

.

1

3

1

2

.

1

5

1

2

.

1

4

1

2

.

1

3

1

2

.

2

2

1

2

.

2

1

1

2

.

1

9

1

2

.

1

8

1

2

.

1

0

1

2

.

1

4

1

1

.

9

6

1

1

.

7

0

1

1

.

5

6

1

2

.

0

5

1

2

.

1

4

1

2

.

1

2

1

2

.

1

8

1

2

.

1

2

1

2

.

1

5

1

1

.

5

4

1

1

.

6

3

1

1

.

7

3

1

1

.

7

8

1

1

.

8

1

1

1

.

6

4

1

1

.

6

3

1

1

.8

4

1

1

.9

0

1

1

.8

5

1

1

.8

6

1

1

.8

2

1

1

.

9

6

1

1

.

9

8

1

2

.

0

1

1

2

.

0

3

12.02

1

1

.6

1

1

1

.6

2

1

1

.

6

9

1

1

.

6

9

1

1

.

8

0

1

1

.

9

7

1

1

.7

4

1

1

.

8

7

1

1

.

7

3

1

2

.

1

4

1

1

.

9

7

1

1

.

8

8

1

1

.

9

2

1

1

.

9

5

1

1

.

9

7

1

2

.

0

2

1

2

.0

1

1

2

.

0

1

1

2

.

1

2

1

2

.

0

9

1

2

.

0

8

1

2

.

1

3

1

2

.0

7

1

2

.

0

3

1

2

.

2

4

1

2

.

1

8

1

2

.

1

4

1

2

.

1

8

1

2

.

1

9

1

2

.

2

9

1

2

.

3

3

Gate

Gate

G

a

t

e

Ga

te

BD

BD

BD

15.09

EH

14.22

EH

14.68

EH

19.56

EH

16.89

EH

19.44

EH

16.80

EH

16.80

EH

17.04

EH

17.52

EH

15.66

EH

17.30

EH

17.30

EH

17

.7

0

EH

17

.5

4

EH

15.74

EH

14.29

EH

16.73

EH

16.89

EH

17.15

EH

17.39

EH

16.62

EH

16.87

EH

17.29

EH

15

.8

1

EH

16

.0

6

EH

15

.3

2

EH

15

.5

7

EH

15

.6

2

EH

17

.2

6

EH

17

.1

7

EH

15

.7

0

EH

15

.6

7

EH

17

.1

9

EH

17

.1

9

EH

17

.6

2

EH

20

.6

4

EH

15

.5

7

EH

14

.9

9

EH

20

.8

6

EH

15

.6

1

EH

15

.8

3

EH

15

.9

1

EH

15

.6

1

EH

17

.0

1

EH

17.46

EH

EP

12.02

FL

12.04

FL

12.12

FL

12.01

FL

12.20

FL

11.92

FL

11.93

FL

12

.1

0

FL

12

.1

2

FL

12.04

FL

12.05

FL

12.13

FL

12

.1

3

FL

12

.1

9

FL

12

.2

3

FL

12

.2

5

FL

12

.2

4

FL

12

.2

3

FL

12

.2

4

FL

12

.1

9

FL

12

.3

1

FL

12

.3

7

FL

12

.2

6

FL

12

.1

5

FL

12

.1

9

FL

12

.2

2

FL

12

.2

8

FL

12

.2

4

FL

12

.4

7

FL

12

.5

0

FL

12

.4

3

FL

12

.5

4

FL

12

.3

2

FL

12

.2

5

FL

12

.2

7

FL

12

.2

2

FL

12

.1

2

FL

16.33

Flat R

oof

14.60

Flat R

oof

14.73

Flat R

oof

15.61

Flat R

oof

GP

GP

GP

GP

G

G

G

G

G

G

G

G

G

G

G

LP

LP

LP

11.66

MH

C

L

11.63

MH

C

L

Post

Post

Post

Post

Post

Post

Post

Post

Po

st

RE

17.23

RH

22.71

RH

19.78

RH

19.72

RH

22.58

RH

19.48

RH

21.11

RH

17.33

RH

19.73

RH

20

.0

4

RH

20

.1

7

RH

19.65

RH

15.60

RH

19.77

RH

19.66

RH

19.41

RH

19.27

RH

20.24

RH

20.23

RH

20.88

RH

19.77

RH

18

.8

8

RH

18

.9

6

RH

18

.7

2

RH

18

.9

1

RH

18

.9

0

RH

17

.8

6

RH

19

.7

2

RH

17

.3

3

RH

20

.1

0

RH

21

.1

6

RH

24

.5

4

RH

17.22

RH

18

.8

8

RH

18

.8

9

RH

16

.7

9

RH

24

.3

5

RH

23

.3

0

RH

18

.9

3

RH

18

.9

2

RH

18

.8

1

RH

19.90

RH

Sign

Stay

Stay

TP

TP

TP

TP

1

1

.

5

8

1

1

.

6

0

1

1

.

6

1

1

1

.6

0

1

1

.

6

2

1

1

.

6

6

1

1

.

6

9

1

1

.6

4

1

1

.

6

7

1

1

.

6

6

1

1

.6

9

1

1

.

8

6

1

1

.

8

9

1

1

.

9

1

1

1

.

9

5

1

2

.

0

0

1

2

.

1

0

1

2

.

1

3

1

2

.

1

3

1

2

.

1

2

1

1

.5

4

1

1

.4

8

1

1

.

5

2

1

1

.

5

6

1

1

.

6

5

Sign

Sign

1

1

.9

1

1

1

.

8

9

1

1

.8

5

S

t

e

p

1

1

.

8

6

1

1

.9

4

2001

2003

2004

2005

20

07

20

08

2009

20

10

20

11

20

06

G

11.74

1

1

.

7

2

1

1

.

7

2

11.7

0

1

1

.

7

1

1

1

.

6

8

1

1

.

6

7

1

1

.

6

5

1

1

.

6

2

1

1

.6

6

1

1

.

7

0

1

1

.

7

4

1

1

.

8

1

1

1

.

9

2

G

G

1

1

.

6

8

1

1

.6

4

1

1

.

5

6

1

1

.

5

9

1

1

.

6

0

1

1

.8

4

1

1

.

6

9

1

1

.

6

6

1

1

.

6

4

1

1

.

6

7

1

1

.

6

0

11.58

IC

C

L

1

1

.6

8

1

1

.

7

3

1

1

.

7

5

1

1

.

6

5

1

1

.6

7

1

1

.7

2

1

1

.6

9

1

1

.6

1

1

1

.6

0

1

1

.

6

0

1

1

.6

2

11.68

1

1

.7

3

1

1

.8

5

11.88

IC

C

L

1

1

.

8

7

11.86

IC

C

L

1

1

.8

8

1

1

.

8

9

1

1

.9

0

1

1

.8

8

1

1

.8

8

1

1

.8

8

1

1

.8

8

1

1

.8

5

1

1

.8

4

1

1

.8

3

11.90

IC

C

L

1

1

.8

3

1

1

.8

4

1

1

.8

8

1

1

.9

8

1

1

.

8

6

BT

11.90

IC

C

L

1

1

.8

6

1

1

.8

3

1

1

.8

3

1

1

.8

5

11.89

IC

C

L

11.93

IC

C

L

12.22

WM

C

L

11.98

MH

C

L

1

1

.

8

7

1

1

.

8

7

1

1

.

8

6

1

1

.

8

5

1

2

.

0

6

1

1

.

9

2

1

1

.

8

4

1

2

.

0

1

1

2

.

0

0

1

1

.

8

0

1

1

.

8

4

1

2

.

2

5

1

2

.

2

8

11.94

IC

C

L

G

G

1

1

.

9

7

1

1

.

9

3

1

1

.

9

51

1

.8

9

1

1

.

9

3

1

1

.

9

4

1

1

.

9

2

1

1

.

8

9

1

1

.

8

8

1

1

.

8

5

1

1

.

8

1

1

1

.

8

6

1

1

.

8

4

11.88

IC

C

L

11.81

IC

C

L

11.58

MH

C

L

11.63

IC

C

L

G

11.64

MH

C

L

11.69

IC

C

L

G

1

1

.

6

1

1

1

.

6

6

1

1

.

9

9

1

1

.

9

8

1

1

.

7

6

1

1

.

6

9

1

1

.

7

6

1

1

.8

8

1

1

.

8

4

1

1

.

7

9

1

1

.8

8

1

1

.8

8

1

1

.

8

8

1

1

.6

3

1

1

.6

2

1

1

.6

2

1

1

.

6

0

1

1

.

6

2

1

1

.

7

1

1

2

.

0

5

1

1

.

9

4

1

1

.

8

4

1

1

.

8

2

1

1

.

7

1

1

1

.7

1

G

1

2

.

0

1

1

2

.

0

2

1

1

.

8

3

1

1

.

7

3

1

1

.

6

7

1

1

.

6

1

11.5

7

11.5

5

1

1

.

5

0

1

1

.

5

4

1

1

.

6

1

11.63

1

1

.

6

4

1

1

.

6

7

1

1

.

6

8

1

1

.

7

5

1

1

.

8

4

1

1

.8

5

11.87

1

1

.

8

9

1

1

.

9

5

1

2

.

0

3

1

2

.

0

5

12.01

1

2

.

1

1

1

2

.

0

8

1

2

.

0

6

1

2

.

0

4

1

2

.

1

1

1

2

.1

1

1

2

.

1

0

1

2

.

0

2

1

1

.

9

5

1

1

.

9

2

1

1

.

8

4

11.96

MH

C

L

D

r

a

i

n

1

2

.

1

4

G

G

1

2

.

2

4

1

2

.

2

1

1

2

.

1

2

1

2

.

1

6

1

2

.

1

2

1

2

.

1

5

1

2

.

1

1

1

2

.

2

1

1

2

.

2

4

1

2

.

3

7

1

2

.

5

1

1

2

.

4

9

1

2

.

9

8

1

2

.9

8

1

2

.

2

5

1

2

.

2

3

1

2

.

1

8

GV

12

.2

5

Ga

s

12

.7

0

IC

C

L

1

1

.

6

0

1

1

.

6

6

1

1

.

8

6

1

1

.

8

2

1

2

.

0

9

1

2

.

1

5

1

2

.

2

3

1

2

.

2

7

1

2

.

3

0

1

2

.

3

5

1

2

.

4

5

1

2

.

5

6

1

2

.

5

9

1

2

.

6

6

1

2

.5

7

12.6

1

12.5

6

12.4

5

12.2

9

12.2

7

12.2

7

12.3

0

12

.4

1

IC

C

L

1

2

.

3

3

1

2

.

4

3

1

2

.

3

5

S

t

e

p

1

2

.

3

9

1

2

.

3

7

S

t

e

p

1

2

.3

6

11

.9

7

IC

C

L

11

.9

5

IC

C

L

1

1

.

9

7

1

1

.

9

5

1

1

.

9

7

1

2

.

2

1

1

2

.

2

2

1

2

.

1

5

1

2

.

1

5

1

1

.

9

9

1

1

.

9

8

G

12

.0

2

IC

C

L

G

G

11.59

11.58

11.59

11.60

11.61

11.67

11.69

11.66

11.67

11.80

11.88

11.59

11.62

11.62

11.58

11.85

11.94

11.87

11.81

11.91

12.18

12.23

12.10

12.27

12.13

12.14

11.94

12.05

12.03

11.94

11.96

11.92

12.30

12.28

12.28

12.10

12

.0

9

12

.1

7

12.14

12.00

12

.1

5

11.99

11.78

11.70

11.68

11.92

11.73

11.74

11.69

11.65

11.75

11.77

11.70

11.67

11.92

1

1

.

9

9

12.04

12.29

12.20

11.85

1

1

.

8

2

12

.2

3

11

.9

6

12

.0

2

11

.9

9

12

.0

6

12

.0

4

12

.1

3

12

.5

8

12

.5

2

12

.4

0

12

.2

4

12

.2

4

12

.2

2

12

.2

5

12

.3

5

12

.2

6

12

.3

0

12

.3

9

12

.5

3

12

.4

8

12

.4

5

12

.6

2

12

.4

9

12

.3

8

12

.2

4

G

C

P

S

C

P

S

Gravel

Gravel

Gravel

C

o

n

c

r

e

te

Gravel

Grass

Gravel

Gravel

Tarm

ac

Co

ncre

te

Co

ncre

te

C

o

n

c

r

e

t

e

Co

ncre

te

Tarm

ac

Tarm

ac

Ta

rm

ac

2002

Concre

te P

anel F

ence

Grass

Concre

te P

anel F

ence

C

o

n

c

r

e

t

e

P

a

n

e

l

F

e

n

c

e

C

o

n

c

r

e

t

e

P

a

n

e

l

F

e

n

c

e

P

o

s

t

&

R

a

il

F

e

n

c

e

C

o

n

c

r

e

t

e

P

a

n

e

l

F

e

n

c

e

CP

S

Gas

Meter

CP

S

CP

S

S

t

e

p

S

t

e

p

CP

S

CP

S

No

Acce

ss

1

1

.6

9

C

lo

s

e

d

B

o

a

r

d

F

e

n

c

e

C

o

n

c

r

e

t

e

P

a

n

e

l

F

e

n

c

e

Concrete

Concrete

Grass

C

o

n

c

r

e

te

P

a

n

e

l F

e

n

c

e

C

o

n

c

r

e

t

e

P

a

n

e

l

F

e

n

c

e

Unable to

Survey

Un

ab

le

to

Su

rve

y

DO

N

OT

S

CA

LE

PR

EL

IM

IN

AR

Y

C1

01

HY

D1

57

IM

PE

RM

EA

BL

E A

RE

AS

P

LA

N

WA

RR

IN

GT

ON

41

H

AW

TH

OR

NE

S

TR

EE

T

DO

N

OT

S

CA

LE

PR

EL

IM

IN

AR

Y

D2

01

HY

D1

57

IM

PE

RM

EA

BL

E A

RE

AS

P

LA

N

WA

RR

IN

GT

ON

41

H

AW

TH

OR

NE

S

TR

EE

T




APPENDIX O: OVERLAND FLOOD FLOW ROUTING


1

1

.

7

7

1

1

.

7

1

1

1

.

6

7

1

1

.

9

6

1

2

.

0

3

1

1

.

9

9

1

2

.

0

2

1

1

.

8

9

1

1

.

8

6

1

1

.8

7

1

1

.8

3

1

1

.9

1

1

1

.

9

2

1

1

.8

7

1

1

.8

1

1

2

.

0

3

1

2

.

0

8

1

2

.

1

1

1

1

.

9

5

1

1

.

9

6

1

2

.

1

2

1

2

.

1

8

1

2

.

1

7

1

2

.

1

4

1

2

.

1

3

1

2

.

2

8

1

2

.

2

8

1

1

.

9

1

1

1

.

9

8

1

2

.

0

8

1

2

.

0

7

1

2

.

0

0

1

2

.

0

2

1

2

.

0

7

1

2

.

0

4

1

2

.

1

0

1

2

.

1

3

1

2

.

1

5

1

2

.

1

4

1

2

.

1

3

1

2

.

2

2

1

2

.

2

1

1

2

.

1

9

1

2

.

1

8

1

2

.

1

0

1

2

.

1

4

1

1

.

9

6

1

1

.

7

0

1

1

.

5

6

1

2

.

0

5

1

2

.

1

4

1

2

.

1

2

1

2

.

1

8

1

2

.

1

2

1

2

.

1

5

1

1

.

5

4

1

1

.

6

3

1

1

.

7

3

1

1

.

7

8

1

1

.

8

1

1

1

.

6

4

1

1

.

6

3

1

1

.8

4

1

1

.9

0

1

1

.8

5

1

1

.8

6

1

1

.8

2

1

1

.

9

6

1

1

.

9

8

1

2

.

0

1

1

2

.

0

3

12.02

1

1

.6

1

1

1

.6

2

1

1

.

6

9

1

1

.

6

9

1

1

.

8

0

1

1

.

9

7

1

1

.

7

4

1

1

.

8

7

1

1

.

7

3

1

2

.

1

4

1

1

.

9

7

1

1

.

8

8

1

1

.

9

2

1

1

.

9

5

1

1

.

9

7

1

2

.

0

2

1

2

.0

1

1

2

.

0

1

1

2

.

1

2

1

2

.

0

9

1

2

.

0

8

1

2

.

1

3

1

2

.0

7

1

2

.

0

3

1

2

.

2

4

1

2

.

1

8

1

2

.

1

4 1

2

.

1

8

1

2

.

1

9

1

2

.

2

9

1

2

.

3

3

Gate

Gate

G

a

t

e

Ga

te

BD

BD

BD

15.09

EH

14.22

EH

14.68

EH

19.56

EH

16.89

EH

19.44

EH

16.80

EH

16.80

EH

17.04

EH

17.52

EH

15.66

EH

17.30

EH

17.3

0

EH

17

.7

0

EH

17

.5

4

EH

15.74

EH

14.29

EH

16.73

EH

16.89

EH

17.15

EH

17.39

EH

16.62

EH

16.87

EH

17.29

EH

15

.8

1

EH

16

.0

6

EH

15

.3

2

EH

15

.5

7

EH

15

.6

2

EH

17

.2

6

EH

17

.1

7

EH

15

.7

0

EH

15

.6

7

EH

17

.1

9

EH

17

.1

9

EH

17

.6

2

EH

20

.6

4

EH

15

.5

7

EH

14

.9

9

EH

20

.8

6

EH

15

.6

1

EH

15

.8

3

EH

15

.9

1

EH

15

.6

1

EH

17

.0

1

EH

17.46

EH

EP

12.02

FL

12.04

FL

12.12

FL

12.01

FL

12.20

FL

11.92

FL

11.93

FL

12

.1

0

FL

12

.1

2

FL

12.04

FL

12.05

FL

12.13

FL

12

.1

3

FL

12

.1

9

FL

12

.2

3

FL

12

.2

5

FL

12

.2

4

FL

12

.2

3

FL

12

.2

4

FL

12

.1

9

FL

12

.3

1

FL

12

.3

7

FL

12

.2

6

FL

12

.1

5

FL

12

.1

9

FL

12

.2

2

FL

12

.2

8

FL

12

.2

4

FL

12

.4

7

FL

12

.5

0

FL

12

.4

3

FL

12

.5

4

FL

12

.3

2

FL

12

.2

5

FL

12

.2

7

FL

12

.2

2

FL

12

.1

2

FL

16.33

Flat R

oof

14.60

Flat R

oof

14.73

Flat R

oof

15.61

Flat R

oof

GP

GP

GP

GP

G

G

G

G

G

G

G

G

G

G

G

LP

LP

LP

11.66

MH

C

L

11.63

MH

C

L

Post

Post

Post

Post

Post

Post

Post

Post

Po

st

RE

17.23

RH

22.71

RH

19.78

RH

19.72

RH

22.58

RH

19.48

RH

21.11

RH

17.33

RH

19.73

RH

20

.0

4

RH

20

.1

7

RH

19.65

RH

15.60

RH

19.77

RH

19.66

RH

19.41

RH

19.27

RH

20.24

RH

20.23

RH

20.88

RH

19.77

RH

18

.8

8

RH

18

.9

6

RH

18

.7

2

RH

18

.9

1

RH

18

.9

0

RH

17

.8

6

RH

19

.7

2

RH

17

.3

3

RH

20

.1

0

RH

21

.1

6

RH

24

.5

4

RH

17.22

RH

18

.8

8

RH

18

.8

9

RH

16

.7

9

RH

24

.3

5

RH

23

.3

0

RH

18

.9

3

RH

18

.9

2

RH

18

.8

1

RH

19.90

RH

Sign

Stay

Stay

TP

TP

TP

TP

1

1

.

5

8

1

1

.

6

0

1

1

.

6

1

1

1

.6

0

1

1

.

6

2

1

1

.

6

6

1

1

.

6

9

1

1

.6

4

1

1

.

6

7

1

1

.

6

6

1

1

.6

9

1

1

.

8

6

1

1

.

8

9

1

1

.

9

1

1

1

.

9

5

1

2

.

0

0

1

2

.

1

0

1

2

.

1

3

1

2

.

1

3

1

2

.

1

2

1

1

.5

4

1

1

.4

8

1

1

.

5

2

1

1

.

5

6

1

1

.

6

5

Sign

Sign

1

1

.9

1

1

1

.

8

9

1

1

.8

5

S

t

e

p

1

1

.

8

6

1

1

.9

4

2001

2003

2004

2005

20

07

20

08

2009

20

10

20

11

20

06

G

11.74

1

1

.

7

2

1

1

.

7

2

11.7

0

1

1

.

7

1

1

1

.

6

8

1

1

.

6

7

1

1

.

6

5

1

1

.

6

2

1

1

.

6

6

1

1

.

7

0

1

1

.

7

4

1

1

.

8

1

1

1

.

9

2

G

G

1

1

.

6

8

1

1

.

6

4

1

1

.

5

6

1

1

.

5

9

1

1

.

6

0

1

1

.8

4

1

1

.

6

9

1

1

.

6

6

1

1

.

6

4

1

1

.

6

7

1

1

.

6

0

11.58

IC

C

L

1

1

.6

8

1

1

.7

3

1

1

.

7

5

1

1

.6

5

1

1

.6

7

1

1

.7

2

1

1

.6

9

1

1

.6

1

1

1

.6

0

1

1

.

6

0

1

1

.6

2

11.68

1

1

.7

3

1

1

.8

5

11.88

IC

C

L

1

1

.

8

7

11.86

IC

C

L

1

1

.8

8

1

1

.

8

9

1

1

.9

0

1

1

.8

8

1

1

.8

8

1

1

.8

8

1

1

.8

8

1

1

.8

5

1

1

.8

4

1

1

.8

3

11.90

IC

C

L

1

1

.8

3

1

1

.8

4

1

1

.

8

8

1

1

.9

8

1

1

.

8

6

BT

11.90

IC

C

L

1

1

.8

6

1

1

.8

3

1

1

.8

3

1

1

.8

5

11.89

IC

C

L

11.93

IC

C

L

12.22

WM

C

L

11.98

MH

C

L

1

1

.

8

7

1

1

.

8

7

1

1

.

8

6

1

1

.

8

5

1

2

.

0

6

1

1

.

9

2

1

1

.

8

4

1

2

.

0

1

1

2

.

0

0

1

1

.

8

0

1

1

.

8

4

1

2

.

2

5

1

2

.

2

8

11.94

IC

C

L

G

G

1

1

.

9

7

1

1

.

9

3

1

1

.9

51

1

.8

9

1

1

.

9

3

1

1

.

9

4

1

1

.

9

2

1

1

.

8

9

1

1

.

8

8

1

1

.

8

5

1

1

.

8

1

1

1

.

8

6

1

1

.

8

4

11.88

IC

C

L

11.81

IC

C

L

11.58

MH

C

L

11.63

IC

C

L

G

11.64

MH

C

L

11.69

IC

C

L

G

1

1

.

6

1

1

1

.

6

6

1

1

.

9

9

1

1

.

9

8

1

1

.

7

6

1

1

.

6

9

1

1

.

7

6

1

1

.8

8

1

1

.8

4

1

1

.

7

9

1

1

.8

8

1

1

.8

8

1

1

.

8

8

1

1

.6

3

1

1

.6

2

1

1

.6

2

1

1

.

6

0

1

1

.

6

2

1

1

.

7

1

1

2

.

0

5

1

1

.

9

4

1

1

.

8

4

1

1

.

8

2

1

1

.

7

1

1

1

.

7

1

G

1

2

.

0

1

1

2

.

0

2

1

1

.

8

3

1

1

.

7

3

1

1

.

6

7

1

1

.

6

1

11.5

7

11.55

1

1

.

5

0

1

1

.

5

4

1

1

.

6

1

11.63

1

1

.

6

4

1

1

.

6

7

1

1

.

6

8

1

1

.

7

5

1

1

.

8

4

1

1

.8

5

11.87

1

1

.

8

9

1

1

.

9

5

1

2

.

0

3

1

2

.

0

5

12.01

1

2

.

1

1

1

2

.

0

8

1

2

.

0

6

1

2

.

0

4

1

2

.

1

1

1

2

.1

1

1

2

.

1

0

1

2

.

0

2

1

1

.

9

5

1

1

.

9

2

1

1

.

8

4

11.96

MH

C

L

D

r

a

in

1

2

.

1

4

G

G

1

2

.

2

4

1

2

.

2

1

1

2

.

1

2

1

2

.

1

6

1

2

.

1

2

1

2

.

1

5

1

2

.

1

1

1

2

.

2

1

1

2

.

2

4

1

2

.

3

7

1

2

.

5

1

1

2

.

4

9

1

2

.

9

8

1

2

.9

8

1

2

.

2

5

1

2

.

2

3

1

2

.

1

8

GV

12

.2

5

Ga

s

12

.7

0

IC

C

L

1

1

.

6

0

1

1

.

6

6

1

1

.

8

6

1

1

.

8

2

1

2

.

0

9

1

2

.

1

5

1

2

.

2

3

1

2

.

2

7

1

2

.

3

0

1

2

.

3

5

1

2

.

4

5

1

2

.

5

6

1

2

.

5

9

1

2

.

6

6

12.5

7

12.6

1

12.5

6

12.4

5

12.2

9

12.2

7

12.2

7

12.3

0

12

.4

1

IC

C

L

1

2

.

3

3

1

2

.

4

3

1

2

.

3

5

S

t

e

p

1

2

.

3

9

1

2

.

3

7

S

t

e

p

1

2

.3

6

11

.9

7

IC

C

L

11

.9

5

IC

C

L

1

1

.

9

7

1

1

.

9

5

1

1

.9

7

1

2

.

2

1

1

2

.

2

2

1

2

.

1

5

1

2

.

1

5

1

1

.

9

9

1

1

.

9

8

G

12

.0

2

IC

C

L

G

G

11.59

11.58

11.59

11.60

11.61

11.67

11.69

11.66

11.67

11.80

11.88

11.59

11.62

11.62

11.58

11.85

11.94

11.87

11.81

11.91

12.18

12.23

12.10

12.27

12.13

12.14

11.94

12.05

12.03

11.94

11.96

11.92

12.30

12.28

12.28

12.10

12

.0

9

12

.1

7

12

.1

4

12.00

12

.1

5

11.99

11.78

11.70

11.68

11.92

11.73

11.74

11.69

11.65

11.75

11.77

11.70

11.67

11.92

1

1

.

9

9

12.04

12.29

12.20

11.85

1

1

.

8

2

12

.2

3

11

.9

6

12

.0

2

11

.9

9

12

.0

6

12

.0

4

12

.1

3

12

.5

8

12

.5

2

12

.4

0

12

.2

4

12

.2

4

12

.2

2

12

.2

5

12

.3

5

12

.2

6

12

.3

0

12

.3

9

12

.5

3

12

.4

8

12

.4

5

12

.6

2

12

.4

9

12

.3

8

12

.2

4

G

C

P

S

C

P

S

Gravel

Gravel

Gravel

C

o

n

c

r

e

t

e

Gravel

Grass

Gravel

Gravel

Tarm

ac

Co

ncre

te

Co

ncre

te

C

o

n

c

r

e

t

e

Co

ncre

te

Tarm

ac

Tarm

ac

Ta

rm

ac

2002

Concre

te P

anel F

ence

Grass

Concre

te P

anel F

ence

C

o

n

c

r

e

t

e

P

a

n

e

l

F

e

n

c

e

C

o

n

c

r

e

t

e

P

a

n

e

l

F

e

n

c

e

P

o

s

t

&

R

a

il

F

e

n

c

e

C

o

n

c

r

e

t

e

P

a

n

e

l

F

e

n

c

e

CP

S

Gas

Meter

CP

S

CP

S

S

t

e

p

S

t

e

p

CP

S

CP

S

No

Acce

ss

1

1

.6

9

C

lo

s

e

d

B

o

a

r

d

F

e

n

c

e

C

o

n

c

r

e

t

e

P

a

n

e

l

F

e

n

c

e

Concrete

Concrete

Grass

C

o

n

c

r

e

te

P

a

n

e

l F

e

n

c

e

C

o

n

c

r

e

t

e

P

a

n

e

l

F

e

n

c

e

Unable to

Survey

Un

ab

le

to

Su

rve

y

DO

N

OT

S

CA

LE

PR

EL

IM

IN

AR

Y

C1

02

HY

D1

57

WA

RR

IN

GT

ON

41

H

AW

TH

OR

NE

S

TR

EE

T

DO

N

OT

S

CA

LE

PR

EL

IM

IN

AR

Y

C2

02

HY

D1

57

WA

RR

IN

GT

ON

41

H

AW

TH

OR

NE

S

TR

EE

T




APPENDIX P: ONSITE DRAINAGE INVESTIGATION


Street : Tel: Fax:

Email:

Inspection report / Inspection: 1Date : Job number : Weather : Operator : Section number : PLR SUFFIX:

Weather Vehicle : Camera : Preset : Cleaned : Operator :

Place : Location details: U/S MH :Road : Catchment: U/S Depth :Location Tape number : D/S MH :Inspection Pipe Length D/S Depth :

Use: Pipe shape :Year laid : Pipe size :Purpose : Pipe material :Total length : Lining :

Comment :

14/10/2016 CL9318 no rain or snow D Hampson 1 X

no rain or snow no D Hampson

WA5Hawthorne Street

HB1 (D/S) D/S241016_1

HB1

D/S

CombinedZSample survey to determine asset condition2.79 m

Circular225.00 mmVitrified clay

CCTV SURVEY

1:50 Position Code Observation MPEG Photo Grade

161014__00 // Page: 2

0.00 MH 00:00:01 (Constr) 0Start node type, manhole reference number: HB1

0.00 WL 00:00:01 (Serv) 0Water level 15 % of the vertical dimension

0.50 B 00:00:05 (Struct) 4Broken pipe from 11 O'Clock to 2 O'Clock

1.01 CXI 00:00:17 (Constr) 3Connection intruding from 2 O'Clock diameter: 150 mm intrusion: 15 %

2.79 SA 00:01:29 (Misc) 0Survey abandoned Unable to pass

HB1

STR no def STR peak STR mean STR total STR grade SER no def SER peak SER mean SER total SER grade1 80 28.67 80 4 1 2 0.72 2 3

Structural DefectsService Defects

Constructional FeaturesMiscellaneous Featuress

This is a demo-print by the 'Virtual Print Engine' from IDEAL Software®



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Email:





Comment :



WA5Hawthorne Street

HB1 (D/S) D/S241016_1

HB1

D/S



CCTV SURVEY


161014__00 // Page: 3



1.34 CXI 00:00:12 (Constr) 3Connection intruding from 2 O'Clock diameter: 150 mm intrusion: 15 %

18.14 BRF 00:01:03 (Constr) 0Finish node type, major connection without manhole reference number: D/S Main

HB1

D/S

STR no def STR peak STR mean STR total STR grade SER no def SER peak SER mean SER total SER grade0 0 0 0 1 1 2 0.11 2 3






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Comment :



WA5Hawthorne Street

HB1 (U/S) HB11241016_1

HB11

HB1



CCTV SURVEY


161014__00 // Page: 4



0.98 DER 00:00:11 (Serv) 3Settled deposits, coarse 15 % cross-sectional area loss

4.52 CN 00:00:36 (Constr) 0Connection other than junction from 12 O'Clock diameter:100 mm

18.46 DEEJ 00:01:50 (Serv) 4Attached deposits, encrustation at joint from 7 O'Clock to 5O'Clock 50 % cross-sectional area loss

18.46 SA 00:01:56 (Misc) 0Survey abandoned Unable to proceed

HB1







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Comment :



WA5Hawthorne Street

HB3 (U/S) HB12241016_1

HB12

HB3



CCTV SURVEY


161014__00 // Page: 5



4.96 JXD 00:00:32 (Constr) 0Junction defective, connecting pipe is damaged from 10O'Clock diameter: 150 mm

8.51 S1 DER 00:00:58 (Serv) 3Settled deposits, coarse 15 % cross-sectional area loss S1


8.77 CC 00:01:20 (Struct) 2Crack, circumferential from 12 O'Clock to 2 O'Clock

8.77 CC 00:01:26 (Struct) 2Crack, circumferential from 7 O'Clock to 10 O'Clock

12.53 F1 DER 00:01:57 (Serv) 3Settled deposits, coarse 15 % cross-sectional area loss F1


20.46 JN 00:02:55 (Constr) 0Junction from 1 O'Clock diameter: 150 mm

23.83 MHF 00:03:18 (Constr) 0Finish node type, manhole reference number: HB12

HB3

HB12







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Comment :



WA5Hawthorne Street

HB3 (D/S) 0506241016_1

HB3

0506



CCTV SURVEY


161014__00 // Page: 6





HB3







Street : Tel: Fax:

Email:





Comment :



WA5Hawthorne Street

HB9 (D/S) D/S241016_1

HB9

D/S



CCTV SURVEY


161014__00 // Page: 7




17.98 MHF 00:00:46 (Constr) 0Finish node type, manhole reference number: D/S

HB9

D/S

STR no def STR peak STR mean STR total STR grade SER no def SER peak SER mean SER total SER grade0 0 0 0 1 0 0 0 0 1






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Comment :



WA5Hawthorne Street

HB9 (U/S) HB8241016_1

HB8

HB9



CCTV SURVEY


161014__00 // Page: 8




14.28 S1 DES 00:01:04


16.41 RPZ 00:01:23 (Constr) 0Point repair, other trenchless method from 11 O'Clock to 1O'Clock Hole repair

20.72 RPZ 00:01:54 (Constr) 0Point repair, other trenchless method from 10 O'Clock to 2O'Clock Hole re


HB9

HB8







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Comment :



WA5Hawthorne Street

HB8a (D/S) HB12241016_1

HB8a

HB12



CCTV SURVEY


161014__00 // Page: 9

0.00 MH 00:00:00 (Constr) 0Start node type, manhole reference number: HB8a






HB8a

HB12







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Comment :



WA5Hawthorne Street

HB6 (D/S) HB7241016_1

HB6

HB7



CCTV SURVEY


161014__00 // Page: 10





HB6

HB7







Street : Tel: Fax:

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Comment :



WA5Hawthorne Street

HB6 (U/S) U/S241016_1

U/S

HB6



CCTV SURVEY


161014__00 // Page: 11







26.03 S1 DES 00:01:32 (Serv) 3Settled deposits, fine 15 % cross-sectional area loss S1



28.98 F1 DES 00:01:52 (Serv) 3Settled deposits, fine 15 % cross-sectional area loss F1

28.98 BRF 00:01:52 (Constr) 0Finish node type, major connection without manhole reference number: U/S Head of system

HB6

U/S

STR no def STR peak STR mean STR total STR grade SER no def SER peak SER mean SER total SER grade0 0 0 0 1 1 2 0.2 5.8 3






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Comment :



WA5Hawthorne Street

HB5 (D/S) HB4241016_1

HB5

HB4



CCTV SURVEY


161014__00 // Page: 12



0.00 DES 00:00:02 (Serv) 3Settled deposits, fine 15 % cross-sectional area loss

0.20 H 00:00:05 (Struct) 5Hole in drain/sewer from 9 O'Clock to 1 O'Clock

0.20 VV 00:00:10 (Constr) 0Void visible beyond defect



HB5

HB4







Street : Tel: Fax:

Email:





Comment :



WA5Hawthorne Street

HB4 (D/S) D/S241016_1

HB4

D/S



CCTV SURVEY


161014__00 // Page: 13



1.30 B 00:00:16 (Struct) 4Broken pipe from 7 O'Clock to 3 O'Clock




HB4

D/S

STR no def STR peak STR mean STR total STR grade SER no def SER peak SER mean SER total SER grade1 80 1.78 80 4 0 0 0 0 1






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Comment :



WA5Hawthorne Street

0506 (U/S) HB10241016_1

HB10

0506



CCTV SURVEY


161014__00 // Page: 14

0.00 MH 00:00:00 (Constr) 0Start node type, manhole reference number: 0506


0.00 S1 DES 00:00:01



0506

HB10







Street : Tel: Fax:

Email:





Comment :



WA5Hawthorne Street

HB10 (U/S) HB15241016_1

HB15

HB10



CCTV SURVEY


161014__00 // Page: 15




11.71 RFJ 00:01:21 (Serv) 2Roots, fine at joint


HB10

HB15







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Email:





Comment :



WA5Hawthorne Street

HB15 (U/S) HB16241016_1

HB16

HB15



CCTV SURVEY


161014__00 // Page: 16




HB15

HB16







Street : Tel: Fax:

Email:





Comment :



WA5Hawthorne Street

0506 (U/S) HB3241016_1

HB3

0506



CCTV SURVEY - Overlap


161014__00 // Page: 17



0.00 S1 DES 00:00:02 (Serv) 3Settled deposits, fine 15 % cross-sectional area loss S1


12.28 F1 DES 00:01:22 (Serv) 3Settled deposits, fine 15 % cross-sectional area loss F1


33.08 S2 DES 00:03:01


0506

STR no def STR peak STR mean STR total STR grade SER no def SER peak SER mean SER total SER grade0 0 0 0 1 1 2 0.69 24.4 3






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Email:





Comment :



WA5Hawthorne Street

0502 (U/S) HB2241016_1

HB2

0502



CCTV SURVEY


161014__00 // Page: 18





30.51 OBZ 00:03:24 (Serv) 5Other obstacles, other from 3 O'Clock to 9 O'Clock 50 %cross-sectional area loss Unknown

30.51 SA 00:03:29 (Misc) 0Survey abandoned Unable to pass

0502







Street : Tel: Fax:

Email:





Comment :



WA5Hawthorne Street

0502 (D/S) 0507241016_1

0502

0507



CCTV SURVEY


161014__00 // Page: 19





1.25 CUW 00:01:16 (Misc) 0Loss of vision, camera under water

1.25 SA 00:01:17 (Misc) 0Survey abandoned Cleaning required

0502










APPENDIX Q: PRELIMINARY DRAINAGE LAYOUT


FOLLY FARM CLOSE

LONGSHAW STREET

EXIS

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ENTI

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TO

BE

CON

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ITE

PRIO

R TO

CON

STRU

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N.

DO

N

OT

S

CA

LE

PR

EL

IM

IN

AR

Y

B2

03

HY

D1

57

WA

RR

IN

GT

ON

41

H

AW

TH

OR

NE

S

TR

EE

T




APPENDIX R: NOTES OF LIMITATIONS

The data essentially comprised a study of available documented information from various

sources together with discussions with relevant authorities and other interested parties. There

may also be circumstances at the site that are not documented. The information reviewed is not

exhaustive and has been accepted in good faith as providing representative and true data

pertaining to site conditions. If additional information becomes available which might impact our

conclusions, we request the opportunity to review the information, reassess the potential

concerns and modify our opinion if warranted.

It should be noted that any risks identified in this report are perceived risks based on the available

information.

This report was prepared by Betts Hydro Ltd for the sole and exclusive use of the titled client in

response to particular instructions. Any other parties using the information contained in this

report do so at their own risk and any duty of care to those parties is excluded.

This document has been prepared for the titled project only and should any third party wish to

use or rely upon the contents of the report, written approval from Betts Hydro Ltd must be sought.

Betts Hydro Ltd accepts no responsibility or liability for the consequences of this document being

used for the purpose other than that for which it was commissioned and for this document to any

other party other than the person by whom it was commissioned.

figure 4-7: united utilities internal & external dg5

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