SURFACE WATER AND FOUL WATER

DRAINAGE SCHEME

for

Mr & Mrs J GRACE

PROPOSED REPLACEMENT DWELLING

OLD HALL FARM

CHAPEL LANE, WEST BRADFORD, BB7 4SN

FEBRUARY 2020

REFORD Consulting Engineers Limited

7 Hall Road, Fulwood, Preston, PR2 9QD

Mobile: 07970 265334 Email: r.e.ford@virginmedia.com

Company number: 09620365 VAT Reg. 215 5638 12

20.762 Page 2

CONTENTS

SECTION TITLE PAGE

1 INTRODUCTION 3

2 BASE INFORMATION 4

3 PROPOSED DRAINAGE SCHEME 6

4 SUMMARY AND CONCLUSIONS 8

APPENDICES

A Location plan

B

C

D

Sewer records

Foul and surface water drainage layout

Surface water drainage design

20.762 Page 3

1. INTRODUCTION

1.1 This surface water and foul water drainage scheme has been produced on behalf of

Mr and Mrs J Grace to address Condition 4 of the Planning Permission from Ribble

Valley Borough Council (Reference 3/2019/0952) for the erection of a replacement

dwelling at Old Hall Farm, West Bradford, BB7 4SN. A location plan is included within

Appendix A.

1.2 Condition 4 states the following:

No development shall commence until a surface water drainage scheme has been

submitted to and approved in writing by the Local Planning Authority. The drainage

scheme must include:

(i) An investigation of the hierarchy of drainage options in the National Planning

Practice Guidance (or any subsequent amendment thereof). The investigation

shall include evidence of an assessment of ground conditions and the potential

for infiltration of surface water;

(ii) A restricted rate of discharge of surface water agreed with the local planning

authority (if it is agreed that infiltration is discounted by the investigations);

and

(iii) A timetable for its implementation.

The approved scheme shall also be in accordance with the Non-Statutory Technical

Standards for Sustainable Drainage Systems (March 2015) or any subsequent

replacement national standards. The development hereby permitted shall be carried

out only in accordance with the approved drainage scheme.

1.3 This drainage scheme is to discharge Condition 4 of the planning approval. It describes

the existing site conditions and proposed development. It assesses the potential

impact of proposals on existing sewers and includes a proposed scheme for the

provision of new drainage to serve the proposed development.

20.762 Page 4

2. BASE INFORMATION

Existing site

2.1 The proposal relates to a roughly rectangular piece of land that lies within the

southern part of West Bradford.

2.2 Access to the site is from a private road off Chapel Lane, which is owned by the

applicant.

2.3 The site area is approx. 765m2 excluding the existing access road from Chapel Lane.

2.4 The site is a brownfield site and contains the existing residential dwelling that is to be

replaced.

2.5 A topographical survey has been carried out. Within the development site boundaries

the land has a slight fall towards the east.

Site geology

2.6 The online Soilscapes viewer has identified the geology of this parcel of land as freely

draining floodplain soils.

Understanding of existing drainage local to the site

2.7 United Utilities sewer records identify a 300mm diameter culverted watercourse lying

immediately beyond and parallel to the development site’s north eastern boundary.

The watercourse flows towards the southeast and discharges into the Moor Roads

Sike that lies approx. 80m from the development site.

2.8 United Utilities sewer records also identify a 150mm diameter public combined water

sewer within the private access road to the development site. The sewer flows to the

south and connects with the public combined sewer within Clitheroe Road.

2.9 The sewer records are included within Appendix B.

20.762 Page 5

2.10 The existing building has an onsite drainage system. Surface water is drained to the

culverted watercourse via an existing connection. Foul water is drained into the public

sewer via an existing connection.

Consultation with United Utilities

2.11 During the planning consultation period United Utilities stated that foul water could

drain into the public sewer system. Surface water runoff should drain in the most

sustainable way.

20.762 Page 6

3. PROPOSED DRAINAGE SCHEME

3.1 The proposed foul and surface water drainage layout is included within Appendix C.

Surface water drainage

3.2 In accordance with the National Standards for Sustainable Drainage, the drainage

scheme should incorporate the use of Sustainable Drainage (SuDS) where possible.

The approach promotes the use infiltration features in the first instance. If drainage

cannot be achieved solely through infiltration due to site conditions or contamination

risks, the preferred options are (in order of preference):

(i) a controlled discharge to a local waterbody or watercourse, or

(ii) a controlled discharge into the public sewer network (depending on availability

and capacity).

3.3 The rate and volume of discharge should strive to provide betterment and be

restricted to the pre-development values as far as practicable.

3.4 The online Soilscapes Viewer has identified the site lying in a region characterised by

freely draining floodplain soils. However, any soakaway has to be positioned a

minimum 5m from any building or road, and 2.5m from a boundary line. Unfortunately

due to the size of the site this is not possible to achieve and therefore a soakaway

cannot not be located within the site.

3.5 A culverted watercourse lies immediately beyond and parallel to the development

site’s north eastern boundary. The watercourse flows towards the southeast and

discharges into the Moor Roads Sike that lies approx. 80m from the development site.

3.6 The development is for a replacement single residential dwelling, and there is already

a surface water drainage connection from the existing developed site into the

culverted watercourse that lies immediately beyond and parallel to the development

site’s north eastern boundary. It is therefore intended that a surface water discharge

will be made into the culverted watercourse using the existing connection.

20.762 Page 7

3.7 To reduce the area of impermeable surfaces from the developed site draining to the

culverted watercourse, surface water from the private drive, paths and patios will be

allowed to runoff to channel drains or to adjacent areas of gravel filter strips or

planted beds where it will be allowed to soakaway or be taken up by plants or

evaporated.

3.8 The replacement building increases the roof area on the site and therefore the surface

water runoff from the building will be controlled to 5 l/s prior to discharge into the

culverted watercourse, using the existing connection.

3.9 A surface water drainage design has been carried out for all events up to the 100 year

critical rain storm plus 30% on stored volumes. The additional 30% is to allow for

climate change and has been included in the surface water volume. Attenuation is

provided within the proposed drainage network of pipes and manholes.

3.10 The surface water drainage design is included within Appendix D.

Foul Water Drainage

3.11 United Utilities has stated that foul water from the replacement dwelling can drain

into the public sewer system.

3.12 It is therefore intended that foul water from the developed site will be collected by a

piped system and a discharge made into the 150mm diameter public combined water

sewer that lies within the private access road to the development site, utilising the

existing connection.

20.762 Page 8

4. SUMMARY AND CONCLUSIONS

4.1 This surface water and foul water drainage scheme has been produced on behalf of

Mr and Mrs J Grace to address Condition 4 of the Planning Permission from Ribble

Valley Borough Council (Reference 3/2019/0952) for the erection of a replacement

dwelling at Old Hall Farm, West Bradford, BB7 4SN.

4.2 During the planning consultation period United Utilities stated that foul water could

drain into the public sewer system. Surface water runoff should drain in the most

sustainable way.

4.3 Due to the size of the site it is not possible for soakaway drainage to be located within

the site.

4.4 Surface water runoff from the building will be controlled to 5 l/s prior to discharge

into the culverted watercourse, using the existing connection.

4.5 Foul water from the developed site will discharge into the 150mm diameter public

combined water sewer that lies within the private access road to the development

site, utilising the existing connection.

APPENDIX A

LOCATION PLAN

APPENDIX B

Scale:  1:1294Date:  20/02/2020 SEWER RECORDS

Address or Site Reference:  old hall farmPrinted by:  Property Searches

The position of the underground apparatus shown on this plan is approximate only and is given in accordance with the best information currentlyavailable. United Utilities Water will not accept liability for any loss or damage caused by the actual position being different from those shown.

Crown copyright and database rights 2017 Ordnance Survey 100022432. Unauthorised reproduction will infringe these copyrights.

APPENDIX C

Peter Harrison Architects61C Main Street Addingham Near Ilkley Yorkshire LS29 0PD

Old Hall Farm, West Bradford Mr and Mrs J Grace

Topographic Survey with ground floor planSCALE DRWG. NO.

1:200 @ A1 October 2018 091801-03DO NOT SCALE FROM THIS DRAWING. FIGURED DIMENSIONS ONLY ARE TO BE USED. THIS DRAWING IS THE SOLE COPYRIGHT OF PETER HARRISON ARCHITECTS

T. 01756 748507 M. 07841 860027

REV

E

EP

LP

POSTPOST

POST

POST

POST

POST

POST

POST

POST

POSTPOST

POST

POST

POST

POST

POSTPOST

POST

COL

COL

COL

COL

COL

COL

COL

MH2

IC

STUMP

STUMP

STUMP STU

MP

STUMP

STUMP

STUMP

GU GU

EAVES LEVEL

EAVES LEVEL

EAVE

S LE

VEL

EAVE

S LE

VEL

EAVES LEVEL

EAVE

S LE

VEL

EAVES LEVEL

EAVE

S LE

VEL

EAVE

S LE

VEL

EAVE

S LE

VEL

RIDGE LEVEL

RID

GE

LEVE

L

RID

GE

LEVE

L

RIDGE LEVEL

RID

GE

LEVE

L

THL

THL

THL

THL

THL

THL

THL

THL

BUSH

TOP O

F WALL

TOP O

F WALL

TOP O

F WALL

TOP O

F WALL

TOP O

F WALL

TOP O

F WALL

TOP O

F WALL

TOP O

F WALL

TOP

OF

WAL

L

TOP OF WALL

TOP O

F WALL

TOP O

F WALL

TOP O

F WALL

FFL

TOP

OF

FEN

CE

TOP OF FENCE

TOP O

F FENCE

DP

DP

G 0.3m

G 0.3m

G 0.3m

G 0.3m

G 0.3m

G 0.3mG 0.

3m

G 0.3m

G 0.3mG 0.

3m

G 0.3m

G 0.3m

G 0.3m

G 0.3m

G 0.3m

G 0.3m

G 0.6m

G 0.6m

G 0.6mG 0.

6m

G 0.6m

G 0.6m

G 0.6m

G 0.6m

G 0.6m

G 0.6m

G 0.6m

G 0.6m

G 0.6m

G 0.6m

G 0.6m

G 0.6m

G 0.6m

G 0.6m

G 0.6m

G 0.6m

G 0.9mG 0.

9m

G 0.9m

G 0.9m

G 0.9m

G 0.9m

G 0.9mG 0.

9mG 0.

9m

G 0.9m

G 0.9mG 0.

9m

G 0.9m

G 0.9m

G 0.9m

G 0.9m

G 0.9m

G 0.9m

G 1.3m

G 1.3m

G 1.3m

G 1.3m

G 1.3m

G 1.3m

G 1.3m

G 1.3m

G 1.3m

G 1.3m

G 1.3m

G 1.3mG 1.

3m

G 1.3m

G 1.3m

G 1.3m

G 1.3m

G 1.3m

G 1.3m

G 1.3m

G 1.3m

G 1.3m

G 1.6m

G 1.6m

G 1.6m

G 1.6m

G 1.6m

G 1.6m

G 1.9m

G 1.9m

G 1.9m

G 2.2m

G 2.2m

G 3.1m

G 4.1m

WATER

S170

.112

S269

.394

J268

.868

J365

.564

S565

.116

S366

.389

S463

.988

4443

80N

4444

00N

4444

20N

374500E

374520E

374540E

374560E

374560E

374580E

374580E

70.0

5

70.07

70.16

70.22

70.34

70.44

70.71

70.99

71.09

71.17

70.9771.21

70.93

70.59

70.92

70.43

70.40

70.19

70.60

70.13

69.94

70.22

69.7969.72

69.58

70.0069.69

69.88

70.07

70.15

69.9

3

69.6

169

.60

69.6

0

69.2

8

69.4

6

69.6

8

69.67 69.67

69.76

68.7

068

.66

68.69

68.62 68.51

75.17

68.31

68.0868.40

68.76

69.63

69.5

369

.42

69.60

69.71

68.9

9

69.2

6

69.4

7

69.7

269

.72

69.8

2

69.8169.42

69.0868.56

68.16

69.24

68.89

68.44

67.94

67.35

66.74 66.25

65.35

65.5366

.1966.57

67.1867

.7768.2768.59

68.91

68.53

68.21

67.89 67.36 66.91 66.34

66.75

67.17

67.73

67.87

67.39

67.08

67.07

67.7268

.28

66.7

266

.61

66.4

1

66.10

65.7

1

65.6165.84

66.02

65.84

64.9

6

65.18

65.6

4

65.79

65.14

65.09

65.59

65.23

64.82

70.00

68.43

69.57

68.51

64.87

64.8264.75

65.2565.31

65.72

66.52

66.7366.74

67.45

64.84

69.51

69.43

69.70

69.34

69.41

69.15

70.6

4

71.00

70.62

70.1

5

70.34

70.2

1

69.50

69.47

69.35 69.22

69.22 69.05

69.44

65.6

9

65.6

2

66.0

2

66.1

6

66.43 65.97

65.70

65.71

66.23

66.78

66.75

67.37

67.45

68.02

68.0968.60

68.5969.04

69.07

68.72

68.82

68.96 68.59

68.49

68.33

68.31

68.0567.31

66.79

66.75

66.8

1

66.8

4

66.7

7

66.2

8

65.8

766

.12

65.75 65.70

65.86

66.1

8

66.3

566

.68

66.67

66.75

66.79

66.27

66.05

65.67

65.70

65.43

65.39

65.57

65.43 65

.02

65.1365.12

65.11

65.07

64.95

64.83

64.7

7

64.71

64.73

64.44

64.76

64.66

64.79

65.04

65.23

65.41

65.3

4

65.3

6

65.57

65.39

65.18

65.4

0

65.5

1

65.53

65.83

69.38

69.26

69.2

369

.14

66.91

67.15

67.13 67

.31

67.91

69.02

69.96

66.77

69.1

8

68.4

9

69.83

68.6

0

68.5

2

68.33

67.9

7

70.21

65.73

66.1266.39

66.71

67.30

68.73

68.12

68.12 68.0468.30

68.11

67.8367.28

68.83

67.58

68.02

67.95

68.13

68.10 67.79

67.78

68.19

68.22

68.64

68.19

68.24

68.72

68.80

68.97

68.87

68.87

68.23

67.50

68.03 67.5

4

67.2

567.2

7

67.00

66.72

66.1

866

.28

65.84

65.63

65.61

65.56

65.66

66.45

66.94

65.70

66.91

65.70

67.03 66.85

67.5

4

67.24

67.05

67.6

0

67.52

67.08 67.95

67.94

67.4767.18

68.3

2

67.6

6

67.6

1

66.84

68.79

66.4

5

69.42

66.4

3

66.3

6

66.9

0

66.0

4

65.23

65.01

66.00

65.54

65.04

66.4

7

66.3

1

66.5

3

64.09

64.0

7

64.0

2

64.0

6

64.33

64.16

63.3

463

.99

63.7763.75

63.3

6

63.36

63.98

64.0363.89

63.7263.29

63.8

4

63.62

63.08

63.84

63.1163.5663

.66

63.7

2

63.23

63.3

4

63.2

263

.43

63.81 63.82

63.8563.88

63.9

0

63.25

63.78

64.0

4

63.8963.93

63.9

0

63.88

63.73

63.85

64.0

6

64.22

64.0

2

63.93

63.88 63.79

63.75

63.94

64.05

63.93

64.01

64.22

64.71

64.69

65.0364.83

65.47

65.70

65.80

65.61

65.46

64.96

64.96

64.56

64.25

64.13

64.00

64.13

64.34

64.71

64.86

65.37

65.59

65.09

65.29

65.43

64.57

64.33

64.1

6

64.2

464

.37

64.46

63.97

66.3

0

66.2

9

63.11

63.13

63.1563.91

63.98

63.24

64.0

764

.07

64.11

64.27

64.50

63.76

64.3163.80

64.0

2

65.7

7

65.8

4

65.2

4

65.1

8

64.5

9

64.6

6

64.1

564.1

2

63.9

0

63.7

9

63.5

3

63.5

7

63.4

2

63.7

5

63.3

4

63.7

6

64.14

64.4

0

65.4

0

65.6

1

65.8

7

65.7865.67

65.4365.04

65.02

64.7664.42

64.18

64.23

64.2564.10

64.02

63.9

263.3

063

.43

63.41

63.68

63.71

63.79

63.98

64.03

64.54

64.45

64.5

1

64.8

6

64.56

64.43

64.13

66.5

9

63.9

0

63.3

0

64.4

8

64.5

464

.79

64.8

9

65.0

3

65.03 64.8

0

64.2264.04

63.89

63.9

5

63.4

1

63.62

63.97

63.78

64.51

64.6764.54 63.97

64.11

64.54

65.03

65.89

65.63

65.5

69.5

69.5

69.0

69.5

69.0

68.5

68.5

68.5

65.0

65.0

65.5

65.5

65.5

66.5

66.5

66.0

66.0

66.0

68.0

68.0

68.0

67.5

67.5

67.5

67.0

67.0

67.0

67.0

70.5

68.5

64.0

64.0

63.5

64.5

65.0

64.5

64.5

63.5

65.0

POST & WIREH 1.0m

POST

& W

IRE

H 1

.1m

POST & R

AIL

H 1.2m

STO

NE

CONCRETE

15.10

.2018

13.15

PM

CONCRETE

WAL

L

STO

NE

WAL

LH

1.0

m

POST & RAILH 1.2m

POST & RAILH 1.1m

TRAC

K

TRAC

K

TRACK

TRACK TRACK

DEM

OLI

SHED

WAL

L

TRACK

STONE

CONCRETE

TOP OF BANK

BOTTOM OF BANK

BOTTOM OF BANK

BOTTO

M O

F BANK

TOP O

F BANK

TOP

OF

BAN

K

BOTTO

M O

F BANK

BOTTO

M O

F BANK

TOP O

F BANK

TOP O

F BANK

TOP O

F BANK

GR

ASS

GR

ASS

PAVI

NG

STO

NE

WAL

L

POST

& R

AIL

H 1

.5m

GR

ASS

GR

ASS

GR

ASS

GR

ASS

ROUGHGROUND

STO

NE

BAR

N

STONE WALL

TOP OF BANK

STON

E WALL

GRASS

GRASS

CONCRETE

GRASS

GRASS

GRASS

GRASS

BUSHES

STONE WALL with estate fencing

STO

NE

WAL

L

STONE WALL

H 2.0m

TREE CANOPY

TREE CANOPY

TREE CANOPY

STO

NE

WAL

L w

ith e

stat

e fe

ncin

g

HUT

PART-DEMOLISHEDBUILDING

CO

NC

RET

E BA

RN

CO

NC

RET

E

GR

ASS

ASBESTOSNO ACCESS AREA

TOP

OF

BAN

K

TOP OF BANK

GRASS

STONE WALLH 1.6m

STONE WALL

H 1.6m

STO

NE W

ALL

BUSHES

BOTTOM OF BANK

CANOPY LINE

CAN

OPY

LIN

E

CAN

OPY

LIN

E

CAN

OPY

LIN

E

CAN

OPY

BOTTOM OF BANK

STONE WALL

H 2.0m

POST

& R

AIL

H 1

.6m

GRASS

METALLIC BARN

MET

ALLI

C BA

RN

MET

ALLI

C BA

RN

STONE WALL

STONE WALL

ASPHALT

ASPHALT

PIPE

600

mm

LEVEL

CONC..

LIN

E

CAN

OPY

LIN

E

TREE CANOPY

TREE CANOPY

TREE

CAN

OPY

CANOPY

TREE

TREE

CAN

OPY

X

XMH.3

STONE S

LAB

(UTR

)

69.20IC

\fAri

al|b0

|i0|c

0;M H.

\fAria

l|b0

|i0|c0

;UTRJA

MMED

CL :70

.56

Sitting Room

decorative stove

Utilityand cloaksboot room

ground floor WC

Living Room Kitchen

Study

larder

5150

7600

9000

fireplace

1000

0

north 6002

3777

2546

9700

1670

0

8450

7950

205 sq metres2210 sq feet

Garage

up to officewith en-suite

6515

9675

(garage to have electric vehicle charging point)

(garage to have electric vehicle charging point)

(garage to have electric vehicle charging point)

foul drainage to

adopted mains draiange

1

2

3 4

5HYDROBRAKE MANHOLE

6

CULVERTED WATERCOURSE

PUBLIC COMBINED SEWER

EXMH

EXMH

EXMH

PROPOSED DRAINAGE LAYOUT

SURFACE WATER

FOUL WATER

APPENDIX D

Reford Consul ng Engineers Ltd File: old hall farm v1.pfdNetwork: Storm NetworkBob Ford28/02/2020

Page 1

Flow v9.1 Copyright © 1988-2020 Causeway So ware Solu ons Limited

Design Se ngs

Rainfall MethodologyReturn Period (years)

Addi onal Flow (%)FSR Region

M5-60 (mm)Ra o-R

CVTime of Entry (mins)

FSR20England and Wales19.3000.2500.7505.00

Maximum Time of Concentra on (mins)Maximum Rainfall (mm/hr)

Minimum Velocity (m/s)Connec on Type

Minimum Backdrop Height (m)Preferred Cover Depth (m)

Include Intermediate GroundEnforce best prac ce design rules

30.0075.01.00Level So ts2.0000.350✓✓

Nodes

Name Area(ha)

T of E(mins)

CoverLevel(m)

Diameter(mm)

Depth(m)

123456

0.0100.0070.0040.0040.004

5.005.005.005.005.00

69.95069.95069.95069.95069.95069.950

450450100450

12001200

0.4600.6100.5100.6350.9101.410

Links

Name USNode

DSNode

Length(m)

ks (mm) /n

US IL(m)

DS IL(m)

Fall(m)

Slope(1:X)

Dia(mm)

T of C(mins)

Rain(mm/hr)

Name Vel(m/s)

Cap(l/s)

Flow(l/s)

USDepth

(m)

DSDepth

(m)

Σ Area(ha)

Σ AddIn ow

(l/s)

1.000 1 2 12.000 0.600 69.490 69.340 0.150 80.0 100 5.23 52.4

1.000 0.861 6.8 1.4 0.360 0.510 0.010 0.0

1.001 2 5 20.000 0.600 69.340 69.090 0.250 80.0 100 5.62 51.0

1.001 0.861 6.8 2.4 0.510 0.760 0.017 0.0

2.000 3 4 10.000 0.600 69.440 69.315 0.125 80.0 100 5.19 52.5

2.000 0.861 6.8 0.6 0.410 0.535 0.004 0.0

2.001 4 5 18.000 0.600 69.315 69.090 0.225 80.0 100 5.54 51.3

2.001 0.861 6.8 1.1 0.535 0.760 0.008 0.0

1.002 5 6 5.000 0.600 69.040 68.540 0.500 10.0 150 5.65 50.9

1.002 3.204 56.6 4.0 0.760 1.260 0.029 0.0

Simula on Se ngs

Rainfall MethodologyFSR Region

M5-60 (mm)Ra o-R

Summer CVWinter CV

FSREngland and Wales19.3000.2500.7500.840

Analysis SpeedSkip Steady State

Drain Down Time (mins)Addi onal Storage (m³/ha)

Check Discharge Rate(s)Check Discharge Volume

Normalx24020.0xx

Storm Dura ons15 30 60 120 180 240 360 480 600 720 960 1440

Reford Consul ng Engineers Ltd File: old hall farm v1.pfdNetwork: Storm NetworkBob Ford28/02/2020

Page 2

Flow v9.1 Copyright © 1988-2020 Causeway So ware Solu ons Limited

Return Period(years)

Climate Change(CC %)

Addi onal Area(A %)

Addi onal Flow(Q %)

130

100100

000

30

0000

0000

Node 5 Online Hydro-Brake® Control

Flap ValveReplaces Downstream Link

Invert Level (m)Design Depth (m)Design Flow (l/s)

x✓69.0400.9105.0

Objec veSump Available

Product NumberMin Outlet Diameter (m)

Min Node Diameter (mm)

(HE) Minimise upstream storage✓CTL-SHE-0107-5000-0910-50000.1501200

Reford Consul ng Engineers Ltd File: old hall farm v1.pfdNetwork: Storm NetworkBob Ford28/02/2020

Page 3

Flow v9.1 Copyright © 1988-2020 Causeway So ware Solu ons Limited

Results for 1 year Cri cal Storm Dura on. Lowest mass balance: 98.69%

Node Event USNode

Peak(mins)

Level(m)

Depth(m)

In ow(l/s)

NodeVol (m³)

Flood(m³)

Status

Link Event(Upstream Depth)

USNode

Link DSNode

Ou low(l/s)

Velocity(m/s)

Flow/Cap LinkVol (m³)

DischargeVol (m³)

15 minute winter 1 10 69.518 0.028 1.2 0.0167 0.0000 OK

15 minute winter 1 1.000 2 1.2 0.532 0.173 0.0264

15 minute winter 2 11 69.377 0.037 2.0 0.0145 0.0000 OK

15 minute winter 2 1.001 5 2.0 0.728 0.291 0.0553

15 minute winter 3 10 69.458 0.018 0.5 0.0029 0.0000 OK

15 minute winter 3 2.000 4 0.5 0.383 0.068 0.0121

15 minute winter 4 11 69.340 0.025 1.0 0.0070 0.0000 OK

15 minute winter 4 2.001 5 0.9 0.538 0.132 0.0393

15 minute winter 5 11 69.130 0.090 3.3 0.1092 0.0000 OK

15 minute winter 5 Hydro-Brake® 6 3.2 1.6

15 minute summer 6 1 68.540 0.000 2.9 0.0000 0.0000 OK

Reford Consul ng Engineers Ltd File: old hall farm v1.pfdNetwork: Storm NetworkBob Ford28/02/2020

Page 4

Flow v9.1 Copyright © 1988-2020 Causeway So ware Solu ons Limited

Results for 30 year Cri cal Storm Dura on. Lowest mass balance: 98.69%

Node Event USNode

Peak(mins)

Level(m)

Depth(m)

In ow(l/s)

NodeVol (m³)

Flood(m³)

Status

Link Event(Upstream Depth)

USNode

Link DSNode

Ou low(l/s)

Velocity(m/s)

Flow/Cap LinkVol (m³)

DischargeVol (m³)

15 minute winter 1 10 69.535 0.045 2.8 0.0266 0.0000 OK

15 minute winter 1 1.000 2 2.8 0.657 0.411 0.0646

15 minute winter 2 13 69.451 0.111 4.8 0.0433 0.0000 SURCHARGED

15 minute winter 2 1.001 5 4.6 0.739 0.681 0.1565

15 minute winter 3 11 69.467 0.027 1.1 0.0045 0.0000 OK

15 minute winter 3 2.000 4 1.1 0.485 0.163 0.0408

15 minute winter 4 13 69.397 0.082 2.2 0.0233 0.0000 OK

15 minute winter 4 2.001 5 2.2 0.529 0.323 0.1320

15 minute winter 5 13 69.390 0.350 7.9 0.4272 0.0000 SURCHARGED

15 minute winter 5 Hydro-Brake® 6 5.0 3.8

15 minute summer 6 1 68.540 0.000 5.0 0.0000 0.0000 OK

Reford Consul ng Engineers Ltd File: old hall farm v1.pfdNetwork: Storm NetworkBob Ford28/02/2020

Page 5

Flow v9.1 Copyright © 1988-2020 Causeway So ware Solu ons Limited

Results for 100 year Cri cal Storm Dura on. Lowest mass balance: 98.69%

Node Event USNode

Peak(mins)

Level(m)

Depth(m)

In ow(l/s)

NodeVol (m³)

Flood(m³)

Status

Link Event(Upstream Depth)

USNode

Link DSNode

Ou low(l/s)

Velocity(m/s)

Flow/Cap LinkVol (m³)

DischargeVol (m³)

15 minute winter 1 13 69.623 0.133 3.7 0.0789 0.0000 SURCHARGED

15 minute winter 1 1.000 2 3.6 0.683 0.538 0.0939

15 minute winter 2 13 69.606 0.266 6.2 0.1035 0.0000 SURCHARGED

15 minute winter 2 1.001 5 5.0 0.753 0.736 0.1565

15 minute winter 3 14 69.548 0.108 1.5 0.0178 0.0000 SURCHARGED

15 minute winter 3 2.000 4 1.5 0.516 0.218 0.0782

15 minute winter 4 14 69.548 0.233 3.0 0.0664 0.0000 SURCHARGED

15 minute winter 4 2.001 5 2.5 0.513 0.369 0.1408

15 minute winter 5 14 69.540 0.500 8.9 0.6093 0.0000 SURCHARGED

15 minute winter 5 Hydro-Brake® 6 5.0 5.0

15 minute summer 6 1 68.540 0.000 5.0 0.0000 0.0000 OK

Reford Consul ng Engineers Ltd File: old hall farm v1.pfdNetwork: Storm NetworkBob Ford28/02/2020

Page 6

Flow v9.1 Copyright © 1988-2020 Causeway So ware Solu ons Limited

Results for 100 year +30% CC Cri cal Storm Dura on. Lowest mass balance: 98.69%

Node Event USNode

Peak(mins)

Level(m)

Depth(m)

In ow(l/s)

NodeVol (m³)

Flood(m³)

Status

Link Event(Upstream Depth)

USNode

Link DSNode

Ou low(l/s)

Velocity(m/s)

Flow/Cap LinkVol (m³)

DischargeVol (m³)

30 minute winter 1 23 69.911 0.421 4.0 0.2503 0.0000 FLOOD RISK

30 minute winter 1 1.000 2 3.4 0.666 0.505 0.0939

30 minute winter 2 23 69.898 0.558 6.0 0.2169 0.0000 FLOOD RISK

30 minute winter 2 1.001 5 4.5 0.737 0.665 0.1565

30 minute winter 3 24 69.852 0.412 1.6 0.0681 0.0000 FLOOD RISK

30 minute winter 3 2.000 4 1.5 0.510 0.218 0.0782

30 minute winter 4 24 69.851 0.536 3.0 0.1528 0.0000 FLOOD RISK

30 minute winter 4 2.001 5 2.3 0.525 0.339 0.1408

30 minute winter 5 24 69.843 0.803 7.9 0.9784 0.0000 FLOOD RISK

30 minute winter 5 Hydro-Brake® 6 5.0 9.1

15 minute summer 6 1 68.540 0.000 5.0 0.0000 0.0000 OK