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Land at Brookfields Nurseries Flood Risk & Drainage Due Diligence Report For Taylor Wimpey Date: 02 January 2020 Doc ref: 13830-HYD-XX-XX-RP-D-5001

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  • Land at Brookfields

    Nurseries

    Flood Risk & Drainage Due

    Diligence Report

    For Taylor Wimpey

    Date: 02 January 2020

    Doc ref: 13830-HYD-XX-XX-RP-D-5001

  • TECHNICAL DESIGN NOTE

    TECHNICAL DESIGN NOTE | Land at Brookfield Nurseries, Ruishton | 13830-HYD-XX-XX-RP-D-5001 | 2 January 2020 1

    Project Name Land at Brookfield Nurseries, Ruishton

    Client Taylor Wimpey Strategic Land

    Design Note Title Flood Risk and Drainage Constraints Technical Note

    Document Reference 13830-HYD-XX-XX-RP-D-5001

    Author Daniel Packman

    Reviewers David Lloyd/Richard Hughes

    Revision P03

    Date 2 January 2020

    INTRODUCTION

    This Technical Note has been produced by Hydrock to inform Taylor Wimpey Strategic Land of the flood risk and

    drainage constraints present at the site known as Land at Brookfield Nurseries, Ruishton.

    EXISTING SITE

    The site is located towards the eastern extents of Taunton, to the north of Ruishton Lane. The site is bounded to

    the north and the east by the Black Brook, to the west by agricultural land and residential units, and to the

    south by a Premier Inn and Ruishton Lane.

    The site location plan is included in Appendix ‘A’ of this Technical Note.

    The topographic survey shows that the site generally falls from a high of around 15.8mAOD in the south to

    around 10.2mAOD in the north of the site. A copy of the survey is included in Appendix A. Ordnance Survey

    mapping information indicates that the wider area land around the site also falls generally to the north towards

    the River Tone.

    The development site is currently used as a plant nursery. The site is comprised of a series of existing buildings,

    areas of hardstanding, access roads and landscaped areas.

    Information provided by Soilscapes classifies the soil in the area as clayey with impeded drainage characteristics

    and also indicates that the water table is likely to be near surface. Given the relative heights of the site to the

    watercourses in the area, this is considered to be very likely.

    EXISTING DRAINAGE

    Information provided by Wessex Water indicates that there is an existing 150mm diameter foul sewer located

    beneath Ruishton Lane to the south of the site. The public foul sewer flows in a west to east direction beneath

    the road.

  • TECHNICAL DESIGN NOTE

    TECHNICAL DESIGN NOTE | Land at Brookfield Nurseries, Ruishton | 13830-HYD-XX-XX-RP-D-5001 | 2 January 2020 2

    A 675mm diameter combined sewer is located to the north west of the site on the far side of the Black Brook.

    The combined sewer flows in a south west to north east direction past the site on the far side of the Black

    Brook.

    Due to the likely impeded drainage characteristics of the soil it is expected that the soft surfaces within the site

    will generate surface water runoff. From review of the topographical survey such surface water flows would

    drain to the north towards the Black Brook.

    A copy of the Wessex Water sewer records is included within Appendix B of this Technical Note.

    Plans provided by the client indicate that the existing nursery buildings are served by two septic tanks, which

    discharge to the existing pond to the north of the buildings. A third septic tank serves the adjacent property,

    which discharges to a filter bed located along the southern boundary of the site. The plan provided by the client

    can be found within Appendix A of this technical note.

    DRAINAGE CONSTRAINTS

    Surface Water

    In accordance with the Sustainable Urban Drainage Systems (SuDS) management train1, rainfall run-off should

    be managed as close as possible to its source following the drainage hierarchy listed below:

    1. Infiltrated to ground;

    2. Discharged to local watercourses;

    3. Discharged to a local surface water sewer network; or

    4. Discharged to a local combined water sewer network.

    Infiltration testing has not yet been carried out at the site but due to the poor drainage characteristics of the

    soil and the potentially high water table, it can be assumed that infiltration techniques will not be viable within

    the site. The next option will be to discharge to the Black Brook watercourse at a controlled rate. Micro

    Drainage Source Control calculations indicate that the QBAR runoff rate for the site is 5 l/s/ha.

    Assuming that 65% of the land outside of Flood Zone 3, which equates to approximately 3.2ha, is made

    impermeable post development then this gives a restricted discharge rate of 16 l/s. Micro Drainage Quick

    Storage Calculations indicate that approximately 2,430m³ of attenuation storage will need to be provided within

    the site to restrict the surface water runoff generated by the 1 in 100 year plus 40% climate change storm event

    to the current QBAR rate.

    The drainage strategy includes an attenuation basin as the preferred option for storing the excess volume of

    water, which is considered feasible subject to technical constraints which will be assessed at detailed design

    stage. An indicative plan area required for such a feature is shown in drawing 13830-HYD-XX-XX-DR-C-2200

    found in Appendix C of this Technical Note.

    Discharge from the basin to the Black Brook may be regulated by flood levels in the watercourse which could

    affect the volume calculations and will require confirmation at the detailed design stage.

    1 CIRIA (2015) CIRIA C753 The SuDS Manual

  • TECHNICAL DESIGN NOTE

    TECHNICAL DESIGN NOTE | Land at Brookfield Nurseries, Ruishton | 13830-HYD-XX-XX-RP-D-5001 | 2 January 2020 3

    Foul Water

    It is proposed that foul flows generated by the site are discharged to an existing Wessex Water asset as

    indicated within the Wessex Water plans. It will likely be possible to discharge foul flows from the higher

    elevations of the site near to Ruishton Lane to the existing public foul sewer via a gravity fed sewer but a

    pumping station will be required to discharge foul flows generated in the lower portions of the site. The

    pumping station will likely be required to either pump foul flows up to the existing public foul sewer beneath

    Ruishton Lane or to go beneath the Black Brook and connect to the existing combined sewer. Consultation with

    Wessex Water will be required to determine the most suitable point of connection to the existing public assets.

    The existing septic tanks that serve the nursery buildings will be decommissioned. The filter bed located along

    the southern boundary will also be decommissioned and the foul flows generated by the adjacent property will

    be intercepted by the proposed foul drainage network.

    FLOOD RISK CONSTRAINTS

    Fluvial Flood Risk

    The Environment Agency’s Flood Map for Planning categorises areas along the northern boundary of the site as

    being in Flood Zones 2 and 3. The extent of which the Flood Zones is shown in drawing 1380-HYD-XX-XX-DR-C-

    2200, which is provided in Appendix C of this report.

    Land situated within Flood Zone 3 is that having a 1 in 100 or greater annual probability of river flooding (>1%),

    or a 1 in 200 or greater annual probability of flooding from the sea (>0.5%) in any year. New residential

    development within flood zone 3 is not normally permitted and the area of the site within this zone will need to

    be allocated to uses such as public open space or playing fields- both of which are considered as water

    compatible development. In this location the source of the flooding are the watercourses in the area (i.e.

    fluvial).

    Land situated within Flood Zone 2 has between a 1 in 100 and 1 in 1,000 annual probability of fluvial (river)

    flooding (1% – 0.1%), or between a 1 in 200 and 1 in 1,000 annual probability of sea flooding (0.5% – 0.1%) in

    any year. In this location the risk is fluvial. Whilst residential development can sometimes be acceptable within

    flood Zone 2, planning policy directs new development firstly to Zone 1, which is the low risk zone, and only if

    this is not possible can Zone 2 then be considered. We would recommend at this stage that it is assumed that

    the area of the site that is currently classified as flood zone 2 is also considered unsuitable for residential

    development and uses that are water compatible be considered. It may be possible to locate the drainage

    attenuation features for the site within this flood zone, provided they remain outside of the climate adjusted*

    Zone 3 (* the 1 in 100 year fluvial event within an adjustment for the impact of climate change over the design

    life of the proposed development. This is normally considered to be 100 years for residential development.

    The use of land situated within Flood Zones 2 and 3 will be constrained depending on the vulnerability of the

    proposed use and the level of fluvial flood risk present as per the information set out by the National Planning

    Policy Framework (NPPF) and as indicated above. It should be noted that we are currently seeking confirmation

    from Taunton Deane Borough Council as to whether local policy may require the 1 in 200 year river flood event

    that defines the extent of Zone 3.

    The flood maps for planning do not take into account the effects of climate change and should the hydraulic

    modelling available for the area not include this information there would be a need to undertake fluvial flood

    modelling to confirm site specific risk over the development design life, confirm development limits with

  • TECHNICAL DESIGN NOTE

    TECHNICAL DESIGN NOTE | Land at Brookfield Nurseries, Ruishton | 13830-HYD-XX-XX-RP-D-5001 | 2 January 2020 4

    respect to flood risk, and define the minimum finished floor levels (FFLs) of any proposed buildings within the

    site. The minimum FFLs will need to be set at a 600mm freeboard above the modelled 1 in 100* year plus

    climate change fluvial flood event (* or 200 year event if so confirmed by TDBC).

    The Taunton Surface Water Management Plan (SWMP) published in March 2013 contains historical flooding

    information for the area around the site. Figure T4 'Potential Indicators of Surface Water Flood Risk' located in

    Appendix C of the SWMP contains a historical flood outline for the area. This indicates that there has been

    historical flooding along the Black Brook, which bounds the site to the north. From the outline of this record the

    majority of the historic flooding has taken place to the north of the Black Brook, with only a small amount of

    flooding occurring within the boundary of the site. This is similar to the Flood Zone 3 outline.

    The Black Brook along the northern boundary of the site is classified as an ordinary watercourse and as such a

    5m maintenance buffer from the top of the bank will be required. This buffer is wholly situated within the land

    designated as Flood Zone 3 so should not further constrain site development.

    Surface Water Flood Risk

    The Environment Agency Long Term Flood Risk Map indicates that the northern boundary of the site is at

    potential risk from surface water flooding. The map below shows that the land immediately adjacent to the

    Black Brook is at increased risk of surface water flooding though this is probably more reflective of the fluvial

    risk. As such, surface water flood risk is not considered to place any further constraints on development layout.

    Groundwater Flood Risk

    The 2019 Joint Level 1 Strategic Flood Risk Assessment for Somerset West, Taunton and South Somerset

    Councils (SFRA) states that groundwater flooding is not considered a risk within and surrounding the area of

  • TECHNICAL DESIGN NOTE

    TECHNICAL DESIGN NOTE | Land at Brookfield Nurseries, Ruishton | 13830-HYD-XX-XX-RP-D-5001 | 2 January 2020 5

    Taunton. It should be noted that information provided by Soilscapes indicates that the groundwater levels

    within the lower areas of the site is likely to be near surface/high. Due to the proximity of the site to the Black

    Brook groundwater flooding on the site is unlikely as the levels would be in equilibrium with the water levels

    within the Black Brook. However, the expected near surface water table will place a constraint on the feasibility

    of basement construction within the lower portions of the site.

    END

  • TECHNICAL DESIGN NOTE

    TECHNICAL DESIGN NOTE | Land at Brookfield Nurseries, Ruishton | 13830-HYD-XX-XX-RP-D-5001 | 2 January 2020 6

    APPENDIX A

    Site Location Plan

    Topographic Survey

    Client Development Constraints Plan

  • NEIGHBOURING PROPERTY

    F3

    S5

    B

    L

    A

    C

    K

    B

    R

    O

    O

    K

    Topographical Survey

    0m 2 4 6 8 10 12 14 16 18 20 22

    Land at Brookfield Nurseries

    Ruishton Lane

    Taunton

    Notes:

    1. GRID AND LEVELS BASED ON ORDNANCE DATUM, DERIVED FROM THE

    NATIONAL GNSS NETWORK. LOCAL SCALE FACTOR APPLIED 0.99967.

    2. DRAINAGE INFORMATION HAS BEEN DETERMINED WITHOUT MAN ENTRY

    INTO CHAMBERS AND WHILST EVERY EFFORT HAS BEEN MADE TO

    CORRECTLY IDENTIFY THIS INFORMATION, IT SHOULD ALWAYS BE

    CHECKED IN AREAS THAT ARE CRITICAL TO THE FUTURE PROPOSAL.

    3. ALL SEWERS ARE PRESUMED TO BE STRAIGHT BETWEEN CHAMBERS,

    WITH ROUTES /CONNECTIVITY OBTAINED USING ACOUSTIC METHODS

    ONLY. THESE ARE TO BE CONSIDERED ASSUMED AND SHOULD BE

    INVESTIGATED FURTHER IN CRITICAL AREAS.

    4. TREE AND HEDGE SPECIES HAVE BEEN IDENTIFIED AS ACCURATELY

    AS POSSIBLE BUT SHOULD BE CROSS CHECKED IN CRITICAL AREAS.

    www.mksurveys.com

    Milton KeynesTel 01908 565561 [email protected]

    OxfordTel 01865 594979 [email protected]

    West MidlandsTel 01384 404203 [email protected]

    East MidlandsTel 0116 2849127 [email protected]

    HorshamTel 01403 243162 [email protected]

    www.surveys4bim.co.uk

    TOPOGRAPHICAL KEY

    OPEN SIDED BUILDING

    OVERHEAD ELECTRIC

    OVERHEAD TELECOM

    CONTOUR

    BORE HOLE

    TRIAL HOLE

    GLASSHOUSE

    SPOT LEVEL

    WALL

    BUILDING

    FOUL SEWER

    SURFACE SEWER

    2

    5

    .5

    0

    127.13

    BH

    TH

    TZ

    TOP

    HEDGE SPREADS

    WOODLAND CANOPY

    ROAD UNKERBED

    CHANGE IN SURFACE

    GATE

    FENCE

    KERB CHANNEL

    FOOTPATH

    TREES

    BANKING

    SHOWN TO

    SCALE

    BOTTOM

    & GIRTH

    SPREAD

    SURVEY STATION

    5

    RSROAD SIGN

    WATER LEVEL

    TELECOM INSPECTION COVER

    WATER METER

    TRAFFIC LIGHT

    THRESHOLD LEVEL

    RAIN WATER PIPE

    RETAINING WALL

    STOP VALVE

    STREET NAME PLATE

    UNABLE TO LOCATE

    VENT PIPE

    WASH OUT

    STOP COCK

    SOIL PIPE

    WL

    WM

    TEL

    RWP

    RW

    SNP

    UTL

    WO

    VP

    THL

    TL

    SP

    SV

    SC

    BDBACK DROP

    ORDNANCE SURVEY BENCH MARK

    INSPECTION COVER

    KERB OUTLET

    MARKER POST

    RODDING EYE

    INVERT LEVEL

    POST

    MANHOLE

    METER

    LAMP POST

    GAS VALVE

    GULLY

    ELECTRICITY POLE

    FIRE HYDRANT

    COVER LEVEL

    CONTROL BOX

    CABLES TO GROUND

    FLOOR LEVEL

    CROSSING CONTROL BUTTON

    FOOTPATH

    DROP KERB

    EARTH ROD

    BOLLARD

    BUS STOP

    BRICK

    OSBM

    RE

    MT

    MH

    MK

    PT

    KO

    LP

    IC

    IL

    GY

    GV

    CCB

    CTG

    ER

    FL

    FP

    FH

    EP

    DK

    CB

    CL

    BO

    BS

    BK

    GENERAL ABBREVIATIONS

    AIR VALVEAV

    SOIL VENT PIPE SVP

    AIR CONDITIONING UNITACU

    TACTILE PAVING TAC

    UNABLE TO RAISE UTR

    UNABLE TO SURVEY UTS

    BACK DROP (EXTERNAL)

    P-TRAP

    BACK DROP (INTERNAL)

    P-TRAP

    PO

    DRAINAGE CHANNELDCH

    TELEPHONE CALL BOX TCB

    DAMP PROOF COURSEDPC

    TOP OF WALL TOW

    BLBASE LEVEL

    AVERAGEAv.

    BBBELISHA BEACON

    BOLLARD LIGHT BOL

    CABLE RISER

    CR

    CABLE TV COVER

    CATV

    FOUL WATER FW

    GAS RISER GR

    HARD BED HB

    NO PIPES VISIBLE NPV

    POST BOX P.BOX

    SOFT BED SB

    SURFACE WATER SW

    TRAFFIC LIGHT COVER TLC

    WATER RISER WR

    SONAR LEVEL 127.13

    FENCE ABBREVIATIONS

    CORRUGATED IRON FENCE

    CHESTNUT PALING

    CHAIN LINK FENCE WIRE MESH FENCE

    BARBED WIRE FENCE

    POST AND WIRE FENCE

    POST AND RAIL FENCE

    CLOSE BOARDED FENCE

    IRON RAILINGSB/W

    W/M

    I/R

    CNP

    C/L

    C/B

    C/I

    P/R

    P/W

    CONCRETE PANEL FENCE CPL

    LARCH LAP FENCE L/L

    OVERHANG / CANOPY

    ARROW ON STEPS /

    RAMPS INDICATES

    DIRECTION UPWARDS

    CATCH PIT

    CP

    TELECOM POLE TP

    TICKET MACHINE TM

    WATER TAP WT

    1

    2

    Sheet Layout: (Not to Scale)

    1:200 A0

    Scale: Sheet Size: Sheet Number: Date:

    Project Number:

    1 October 2019

    27821

    Rev:

    -

    AUDITED0013

    Surveyed by:

    ER

    Checked by:

    AJ

    Approved by:

    JS

    Revision Description DateAppr. byCheck. bySurv. by

    Coordinate Table

    Station Description Easting Northing Level

    S1 ROAD NAIL 326013.909 124932.254 14.708

    S2 ROAD NAIL 325936.728 124886.721 15.563

    S3 ROAD NAIL 325893.325 124910.942 16.001

    S4 PEG 325874.352 124901.876 16.327

    S5 PEG 325844.617 124930.442 15.756

    S6 PEG 325895.367 124971.563 15.412

    S7 PEG 325968.660 125041.014 12.750

    S8 PEG 325971.238 124978.133 15.338

    S9 PEG 325976.599 124919.360 15.750

    S11 HILTI 325913.294 124926.220 15.944

    F1 PEG 326014.873 125094.789 10.058

    F2 PEG 325871.674 125023.573 12.889

    F3 PEG 325778.085 124931.743 14.351

    3

    4

    32

    57

    50

    E

    32

    58

    50

    E

    325

    850

    E

    325

    800

    E

    325

    750

    E

    125050 N

    125000 N

    124950 N

    124900 N

    32

    58

    00

    E

    124900 N

    124950 N

    125000 N

    124850 N124850 N

    125050 N

  • GREENHOUSE

    G

    R

    E

    E

    N

    H

    O

    U

    S

    E

    F1

    F2

    S6

    S7

    S8

    B

    L

    A

    C

    K

    B

    R

    O

    O

    K

    B

    L

    A

    C

    K

    B

    R

    O

    O

    K

    0m 2 4 6 8 10 12 14 16 18 20 22

    Revision Description DateAppr. byCheck. bySurv. by

    Topographical Survey

    Land at Brookfield Nurseries

    Ruishton Lane

    Taunton

    www.mksurveys.com

    Milton KeynesTel 01908 565561 [email protected]

    OxfordTel 01865 594979 [email protected]

    West MidlandsTel 01384 404203 [email protected]

    East MidlandsTel 0116 2849127 [email protected]

    HorshamTel 01403 243162 [email protected]

    www.surveys4bim.co.uk

    1:200 A0

    Scale: Sheet Size: Sheet Number: Date:

    Project Number:

    2 October 2019

    27821

    Rev:

    -

    AUDITED

    0013

    Surveyed by:

    ER

    Checked by:

    AJ

    Approved by:

    JS

    Notes:

    1. GRID AND LEVELS BASED ON ORDNANCE DATUM, DERIVED FROM THE

    NATIONAL GNSS NETWORK. LOCAL SCALE FACTOR APPLIED 0.99967.

    2. DRAINAGE INFORMATION HAS BEEN DETERMINED WITHOUT MAN ENTRY

    INTO CHAMBERS AND WHILST EVERY EFFORT HAS BEEN MADE TO

    CORRECTLY IDENTIFY THIS INFORMATION, IT SHOULD ALWAYS BE

    CHECKED IN AREAS THAT ARE CRITICAL TO THE FUTURE PROPOSAL.

    3. ALL SEWERS ARE PRESUMED TO BE STRAIGHT BETWEEN CHAMBERS,

    WITH ROUTES /CONNECTIVITY OBTAINED USING ACOUSTIC METHODS

    ONLY. THESE ARE TO BE CONSIDERED ASSUMED AND SHOULD BE

    INVESTIGATED FURTHER IN CRITICAL AREAS.

    4. TREE AND HEDGE SPECIES HAVE BEEN IDENTIFIED AS ACCURATELY

    AS POSSIBLE BUT SHOULD BE CROSS CHECKED IN CRITICAL AREAS.

    TOPOGRAPHICAL KEY

    OPEN SIDED BUILDING

    OVERHEAD ELECTRIC

    OVERHEAD TELECOM

    CONTOUR

    BORE HOLE

    TRIAL HOLE

    GLASSHOUSE

    SPOT LEVEL

    WALL

    BUILDING

    FOUL SEWER

    SURFACE SEWER

    2

    5

    .5

    0

    127.13

    BH

    TH

    TZ

    TOP

    HEDGE SPREADS

    WOODLAND CANOPY

    ROAD UNKERBED

    CHANGE IN SURFACE

    GATE

    FENCE

    KERB CHANNEL

    FOOTPATH

    TREES

    BANKING

    SHOWN TO

    SCALE

    BOTTOM

    & GIRTH

    SPREAD

    SURVEY STATION

    5

    RSROAD SIGN

    WATER LEVEL

    TELECOM INSPECTION COVER

    WATER METER

    TRAFFIC LIGHT

    THRESHOLD LEVEL

    RAIN WATER PIPE

    RETAINING WALL

    STOP VALVE

    STREET NAME PLATE

    UNABLE TO LOCATE

    VENT PIPE

    WASH OUT

    STOP COCK

    SOIL PIPE

    WL

    WM

    TEL

    RWP

    RW

    SNP

    UTL

    WO

    VP

    THL

    TL

    SP

    SV

    SC

    BDBACK DROP

    ORDNANCE SURVEY BENCH MARK

    INSPECTION COVER

    KERB OUTLET

    MARKER POST

    RODDING EYE

    INVERT LEVEL

    POST

    MANHOLE

    METER

    LAMP POST

    GAS VALVE

    GULLY

    ELECTRICITY POLE

    FIRE HYDRANT

    COVER LEVEL

    CONTROL BOX

    CABLES TO GROUND

    FLOOR LEVEL

    CROSSING CONTROL BUTTON

    FOOTPATH

    DROP KERB

    EARTH ROD

    BOLLARD

    BUS STOP

    BRICK

    OSBM

    RE

    MT

    MH

    MK

    PT

    KO

    LP

    IC

    IL

    GY

    GV

    CCB

    CTG

    ER

    FL

    FP

    FH

    EP

    DK

    CB

    CL

    BO

    BS

    BK

    GENERAL ABBREVIATIONS

    AIR VALVEAV

    SOIL VENT PIPE SVP

    AIR CONDITIONING UNITACU

    TACTILE PAVING TAC

    UNABLE TO RAISE UTR

    UNABLE TO SURVEY UTS

    BACK DROP (EXTERNAL)

    P-TRAP

    BACK DROP (INTERNAL)

    P-TRAP

    PO

    DRAINAGE CHANNELDCH

    TELEPHONE CALL BOX TCB

    DAMP PROOF COURSEDPC

    TOP OF WALL TOW

    BLBASE LEVEL

    AVERAGEAv.

    BBBELISHA BEACON

    BOLLARD LIGHT BOL

    CABLE RISER

    CR

    CABLE TV COVER

    CATV

    FOUL WATER FW

    GAS RISER GR

    HARD BED HB

    NO PIPES VISIBLE NPV

    POST BOX P.BOX

    SOFT BED SB

    SURFACE WATER SW

    TRAFFIC LIGHT COVER TLC

    WATER RISER WR

    SONAR LEVEL 127.13

    FENCE ABBREVIATIONS

    CORRUGATED IRON FENCE

    CHESTNUT PALING

    CHAIN LINK FENCE WIRE MESH FENCE

    BARBED WIRE FENCE

    POST AND WIRE FENCE

    POST AND RAIL FENCE

    CLOSE BOARDED FENCE

    IRON RAILINGSB/W

    W/M

    I/R

    CNP

    C/L

    C/B

    C/I

    P/R

    P/W

    CONCRETE PANEL FENCE CPL

    LARCH LAP FENCE L/L

    OVERHANG / CANOPY

    ARROW ON STEPS /

    RAMPS INDICATES

    DIRECTION UPWARDS

    CATCH PIT

    CP

    TELECOM POLE TP

    TICKET MACHINE TM

    WATER TAP WT

    1

    2

    Sheet Layout: (Not to Scale)

    Coordinate Table

    Station Description Easting Northing Level

    S1 ROAD NAIL 326013.909 124932.254 14.708

    S2 ROAD NAIL 325936.728 124886.721 15.563

    S3 ROAD NAIL 325893.325 124910.942 16.001

    S4 PEG 325874.352 124901.876 16.327

    S5 PEG 325844.617 124930.442 15.756

    S6 PEG 325895.367 124971.563 15.412

    S7 PEG 325968.660 125041.014 12.750

    S8 PEG 325971.238 124978.133 15.338

    S9 PEG 325976.599 124919.360 15.750

    S11 HILTI 325913.294 124926.220 15.944

    F1 PEG 326014.873 125094.789 10.058

    F2 PEG 325871.674 125023.573 12.889

    F3 PEG 325778.085 124931.743 14.351

    3

    4

    32

    58

    50

    E

    32

    60

    00

    E

    125000 N

    125050 N

    125100 N125100 N

    125050 N

    125000 N

    32

    58

    50

    E

    32

    59

    00

    E

    32

    59

    50

    E

    32

    60

    00

    E

    32

    59

    50

    E

    32

    59

    00

    E

  • BROOKFIELD NURSERIES

    B

    R

    O

    O

    K

    F

    I

    E

    L

    D

    N

    U

    R

    S

    E

    R

    I

    E

    S

    GREENHOUSE

    GREENHOUSE

    GREENHOUSE

    G

    R

    E

    E

    N

    H

    O

    U

    S

    E

    NEIGHBOURING PROPERTY

    R

    U

    I

    S

    H

    T

    O

    N

    L

    A

    N

    E

    NEIGHBOURING PROPERTY

    F2

    S1

    S11

    S2

    S3

    S4

    S5

    S6

    S8

    S9

    2 4 6 8 10 12 14 16 18 20 22

    Revision Description DateAppr. byCheck. bySurv. by

    Topographical Survey

    Land at Brookfield Nurseries

    Ruishton Lane

    Taunton

    www.mksurveys.com

    Milton KeynesTel 01908 565561 [email protected]

    OxfordTel 01865 594979 [email protected]

    West MidlandsTel 01384 404203 [email protected]

    East MidlandsTel 0116 2849127 [email protected]

    HorshamTel 01403 243162 [email protected]

    www.surveys4bim.co.uk

    1:200 A0

    Scale: Sheet Size: Sheet Number: Date:

    Project Number:

    3 October 2019

    27821

    Rev:

    -

    AUDITED

    0013

    Surveyed by:

    ER

    Checked by:

    AJ

    Approved by:

    JS

    Notes:

    1. GRID AND LEVELS BASED ON ORDNANCE DATUM, DERIVED FROM THE

    NATIONAL GNSS NETWORK. LOCAL SCALE FACTOR APPLIED 0.99967.

    2. DRAINAGE INFORMATION HAS BEEN DETERMINED WITHOUT MAN ENTRY

    INTO CHAMBERS AND WHILST EVERY EFFORT HAS BEEN MADE TO

    CORRECTLY IDENTIFY THIS INFORMATION, IT SHOULD ALWAYS BE

    CHECKED IN AREAS THAT ARE CRITICAL TO THE FUTURE PROPOSAL.

    3. ALL SEWERS ARE PRESUMED TO BE STRAIGHT BETWEEN CHAMBERS,

    WITH ROUTES /CONNECTIVITY OBTAINED USING ACOUSTIC METHODS

    ONLY. THESE ARE TO BE CONSIDERED ASSUMED AND SHOULD BE

    INVESTIGATED FURTHER IN CRITICAL AREAS.

    4. TREE AND HEDGE SPECIES HAVE BEEN IDENTIFIED AS ACCURATELY

    AS POSSIBLE BUT SHOULD BE CROSS CHECKED IN CRITICAL AREAS.

    TOPOGRAPHICAL KEY

    OPEN SIDED BUILDING

    OVERHEAD ELECTRIC

    OVERHEAD TELECOM

    CONTOUR

    BORE HOLE

    TRIAL HOLE

    GLASSHOUSE

    SPOT LEVEL

    WALL

    BUILDING

    FOUL SEWER

    SURFACE SEWER

    2

    5

    .5

    0

    127.13

    BH

    TH

    TZ

    TOP

    HEDGE SPREADS

    WOODLAND CANOPY

    ROAD UNKERBED

    CHANGE IN SURFACE

    GATE

    FENCE

    KERB CHANNEL

    FOOTPATH

    TREES

    BANKING

    SHOWN TO

    SCALE

    BOTTOM

    & GIRTH

    SPREAD

    SURVEY STATION

    5

    RSROAD SIGN

    WATER LEVEL

    TELECOM INSPECTION COVER

    WATER METER

    TRAFFIC LIGHT

    THRESHOLD LEVEL

    RAIN WATER PIPE

    RETAINING WALL

    STOP VALVE

    STREET NAME PLATE

    UNABLE TO LOCATE

    VENT PIPE

    WASH OUT

    STOP COCK

    SOIL PIPE

    WL

    WM

    TEL

    RWP

    RW

    SNP

    UTL

    WO

    VP

    THL

    TL

    SP

    SV

    SC

    BDBACK DROP

    ORDNANCE SURVEY BENCH MARK

    INSPECTION COVER

    KERB OUTLET

    MARKER POST

    RODDING EYE

    INVERT LEVEL

    POST

    MANHOLE

    METER

    LAMP POST

    GAS VALVE

    GULLY

    ELECTRICITY POLE

    FIRE HYDRANT

    COVER LEVEL

    CONTROL BOX

    CABLES TO GROUND

    FLOOR LEVEL

    CROSSING CONTROL BUTTON

    FOOTPATH

    DROP KERB

    EARTH ROD

    BOLLARD

    BUS STOP

    BRICK

    OSBM

    RE

    MT

    MH

    MK

    PT

    KO

    LP

    IC

    IL

    GY

    GV

    CCB

    CTG

    ER

    FL

    FP

    FH

    EP

    DK

    CB

    CL

    BO

    BS

    BK

    GENERAL ABBREVIATIONS

    AIR VALVEAV

    SOIL VENT PIPE SVP

    AIR CONDITIONING UNITACU

    TACTILE PAVING TAC

    UNABLE TO RAISE UTR

    UNABLE TO SURVEY UTS

    BACK DROP (EXTERNAL)

    P-TRAP

    BACK DROP (INTERNAL)

    P-TRAP

    PO

    DRAINAGE CHANNELDCH

    TELEPHONE CALL BOX TCB

    DAMP PROOF COURSEDPC

    TOP OF WALL TOW

    BLBASE LEVEL

    AVERAGEAv.

    BBBELISHA BEACON

    BOLLARD LIGHT BOL

    CABLE RISER

    CR

    CABLE TV COVER

    CATV

    FOUL WATER FW

    GAS RISER GR

    HARD BED HB

    NO PIPES VISIBLE NPV

    POST BOX P.BOX

    SOFT BED SB

    SURFACE WATER SW

    TRAFFIC LIGHT COVER TLC

    WATER RISER WR

    SONAR LEVEL 127.13

    FENCE ABBREVIATIONS

    CORRUGATED IRON FENCE

    CHESTNUT PALING

    CHAIN LINK FENCE WIRE MESH FENCE

    BARBED WIRE FENCE

    POST AND WIRE FENCE

    POST AND RAIL FENCE

    CLOSE BOARDED FENCE

    IRON RAILINGSB/W

    W/M

    I/R

    CNP

    C/L

    C/B

    C/I

    P/R

    P/W

    CONCRETE PANEL FENCE CPL

    LARCH LAP FENCE L/L

    OVERHANG / CANOPY

    ARROW ON STEPS /

    RAMPS INDICATES

    DIRECTION UPWARDS

    CATCH PIT

    CP

    TELECOM POLE TP

    TICKET MACHINE TM

    WATER TAP WT

    1

    2

    Sheet Layout: (Not to Scale)

    Coordinate Table

    Station Description Easting Northing Level

    S1 ROAD NAIL 326013.909 124932.254 14.708

    S2 ROAD NAIL 325936.728 124886.721 15.563

    S3 ROAD NAIL 325893.325 124910.942 16.001

    S4 PEG 325874.352 124901.876 16.327

    S5 PEG 325844.617 124930.442 15.756

    S6 PEG 325895.367 124971.563 15.412

    S7 PEG 325968.660 125041.014 12.750

    S8 PEG 325971.238 124978.133 15.338

    S9 PEG 325976.599 124919.360 15.750

    S11 HILTI 325913.294 124926.220 15.944

    F1 PEG 326014.873 125094.789 10.058

    F2 PEG 325871.674 125023.573 12.889

    F3 PEG 325778.085 124931.743 14.351

    3

    4

    124900 N

    124950 N

    125000 N

    32

    58

    50

    E

    32

    59

    00

    E

    32

    59

    50

    E

    32

    60

    00

    E

    325

    85

    0 E

    325

    90

    0 E

    325

    95

    0 E

    326

    00

    0 E

    124900 N

    124950 N

    125000 N

  • N

    E

    I

    G

    H

    B

    O

    U

    R

    I

    N

    G

    P

    R

    O

    P

    E

    R

    T

    Y

    NEIGHBOURING PROPERTY

    R

    U

    I

    S

    H

    T

    O

    N

    L

    A

    N

    E

    F1

    S1

    B

    L

    A

    C

    K

    B

    R

    O

    O

    K

    Topographical Survey

    0m 2 4 6 8 10 12 14 16 18 20 22

    Land at Brookfield Nurseries

    Ruishton Lane

    Taunton

    Notes:

    1. GRID AND LEVELS BASED ON ORDNANCE DATUM, DERIVED FROM THE

    NATIONAL GNSS NETWORK. LOCAL SCALE FACTOR APPLIED 0.99967.

    2. DRAINAGE INFORMATION HAS BEEN DETERMINED WITHOUT MAN ENTRY

    INTO CHAMBERS AND WHILST EVERY EFFORT HAS BEEN MADE TO

    CORRECTLY IDENTIFY THIS INFORMATION, IT SHOULD ALWAYS BE

    CHECKED IN AREAS THAT ARE CRITICAL TO THE FUTURE PROPOSAL.

    3. ALL SEWERS ARE PRESUMED TO BE STRAIGHT BETWEEN CHAMBERS,

    WITH ROUTES /CONNECTIVITY OBTAINED USING ACOUSTIC METHODS

    ONLY. THESE ARE TO BE CONSIDERED ASSUMED AND SHOULD BE

    INVESTIGATED FURTHER IN CRITICAL AREAS.

    4. TREE AND HEDGE SPECIES HAVE BEEN IDENTIFIED AS ACCURATELY

    AS POSSIBLE BUT SHOULD BE CROSS CHECKED IN CRITICAL AREAS.

    www.mksurveys.com

    Milton KeynesTel 01908 565561 [email protected]

    OxfordTel 01865 594979 [email protected]

    West MidlandsTel 01384 404203 [email protected]

    East MidlandsTel 0116 2849127 [email protected]

    HorshamTel 01403 243162 [email protected]

    www.surveys4bim.co.uk

    TOPOGRAPHICAL KEY

    OPEN SIDED BUILDING

    OVERHEAD ELECTRIC

    OVERHEAD TELECOM

    CONTOUR

    BORE HOLE

    TRIAL HOLE

    GLASSHOUSE

    SPOT LEVEL

    WALL

    BUILDING

    FOUL SEWER

    SURFACE SEWER

    2

    5

    .5

    0

    127.13

    BH

    TH

    TZ

    TOP

    HEDGE SPREADS

    WOODLAND CANOPY

    ROAD UNKERBED

    CHANGE IN SURFACE

    GATE

    FENCE

    KERB CHANNEL

    FOOTPATH

    TREES

    BANKING

    SHOWN TO

    SCALE

    BOTTOM

    & GIRTH

    SPREAD

    SURVEY STATION

    5

    RSROAD SIGN

    WATER LEVEL

    TELECOM INSPECTION COVER

    WATER METER

    TRAFFIC LIGHT

    THRESHOLD LEVEL

    RAIN WATER PIPE

    RETAINING WALL

    STOP VALVE

    STREET NAME PLATE

    UNABLE TO LOCATE

    VENT PIPE

    WASH OUT

    STOP COCK

    SOIL PIPE

    WL

    WM

    TEL

    RWP

    RW

    SNP

    UTL

    WO

    VP

    THL

    TL

    SP

    SV

    SC

    BDBACK DROP

    ORDNANCE SURVEY BENCH MARK

    INSPECTION COVER

    KERB OUTLET

    MARKER POST

    RODDING EYE

    INVERT LEVEL

    POST

    MANHOLE

    METER

    LAMP POST

    GAS VALVE

    GULLY

    ELECTRICITY POLE

    FIRE HYDRANT

    COVER LEVEL

    CONTROL BOX

    CABLES TO GROUND

    FLOOR LEVEL

    CROSSING CONTROL BUTTON

    FOOTPATH

    DROP KERB

    EARTH ROD

    BOLLARD

    BUS STOP

    BRICK

    OSBM

    RE

    MT

    MH

    MK

    PT

    KO

    LP

    IC

    IL

    GY

    GV

    CCB

    CTG

    ER

    FL

    FP

    FH

    EP

    DK

    CB

    CL

    BO

    BS

    BK

    GENERAL ABBREVIATIONS

    AIR VALVEAV

    SOIL VENT PIPE SVP

    AIR CONDITIONING UNITACU

    TACTILE PAVING TAC

    UNABLE TO RAISE UTR

    UNABLE TO SURVEY UTS

    BACK DROP (EXTERNAL)

    P-TRAP

    BACK DROP (INTERNAL)

    P-TRAP

    PO

    DRAINAGE CHANNELDCH

    TELEPHONE CALL BOX TCB

    DAMP PROOF COURSEDPC

    TOP OF WALL TOW

    BLBASE LEVEL

    AVERAGEAv.

    BBBELISHA BEACON

    BOLLARD LIGHT BOL

    CABLE RISER

    CR

    CABLE TV COVER

    CATV

    FOUL WATER FW

    GAS RISER GR

    HARD BED HB

    NO PIPES VISIBLE NPV

    POST BOX P.BOX

    SOFT BED SB

    SURFACE WATER SW

    TRAFFIC LIGHT COVER TLC

    WATER RISER WR

    SONAR LEVEL 127.13

    FENCE ABBREVIATIONS

    CORRUGATED IRON FENCE

    CHESTNUT PALING

    CHAIN LINK FENCE WIRE MESH FENCE

    BARBED WIRE FENCE

    POST AND WIRE FENCE

    POST AND RAIL FENCE

    CLOSE BOARDED FENCE

    IRON RAILINGSB/W

    W/M

    I/R

    CNP

    C/L

    C/B

    C/I

    P/R

    P/W

    CONCRETE PANEL FENCE CPL

    LARCH LAP FENCE L/L

    OVERHANG / CANOPY

    ARROW ON STEPS /

    RAMPS INDICATES

    DIRECTION UPWARDS

    CATCH PIT

    CP

    TELECOM POLE TP

    TICKET MACHINE TM

    WATER TAP WT

    1

    2

    Sheet Layout: (Not to Scale)

    1:200 A0

    Scale: Sheet Size: Sheet Number: Date:

    Project Number:

    4 October 2019

    27821

    Rev:

    -

    AUDITED0013

    Surveyed by:

    ER

    Checked by:

    AJ

    Approved by:

    JS

    Revision Description DateAppr. byCheck. bySurv. by

    Coordinate Table

    Station Description Easting Northing Level

    S1 ROAD NAIL 326013.909 124932.254 14.708

    S2 ROAD NAIL 325936.728 124886.721 15.563

    S3 ROAD NAIL 325893.325 124910.942 16.001

    S4 PEG 325874.352 124901.876 16.327

    S5 PEG 325844.617 124930.442 15.756

    S6 PEG 325895.367 124971.563 15.412

    S7 PEG 325968.660 125041.014 12.750

    S8 PEG 325971.238 124978.133 15.338

    S9 PEG 325976.599 124919.360 15.750

    S11 HILTI 325913.294 124926.220 15.944

    F1 PEG 326014.873 125094.789 10.058

    F2 PEG 325871.674 125023.573 12.889

    F3 PEG 325778.085 124931.743 14.351

    3

    4

    124950 N

    125100 N

    125150 N

    326

    000

    E

    32

    605

    0 E

    326

    100

    E

    32

    60

    00

    E

    32

    60

    50

    E

    32

    61

    00

    E

    124950 N

    125000 N

    125050 N

    125100 N

    125150 N

    125050 N

    125000 N

  • TECHNICAL DESIGN NOTE

    TECHNICAL DESIGN NOTE | Land at Brookfield Nurseries, Ruishton | 13830-HYD-XX-XX-RP-D-5001 | 2 January 2020 7

    APPENDIX B

    WW Public Sewer Asset Location Plan

  • Reproduced from the Ordnance Survey map by permission on behalf of the Controller of Her Majesty 's Stationery Office © Crown Copyright. Licence 100019539.

    N

    EW

    S

    Centre:

    WATER MAINS Public Private

    PublicRaw Water

    Abandoned Valve Hydrant PRV Meter

    SEWERS Public - Section 104 - PrivateFoul

    Combined

    Surface

    Abandoned sewers

    OTHER WESSEX PIPESRising Mains

    Effluent Disposal MainOverflow

    NON-WESSEX PIPES

    Private Rising MainsCulverted Water Course

    Highway Drain

    Printed on :

    Information in this plan is provided for identification purposes only. No warranty as to accuracy is given or

    implied. The precise route of pipe work may not exactly

    match that shown. Wessex Water does not accept liability for inaccuracies. Sewers and lateral drains

    adopted by Wessex Water under the Water Industry

    (Schemes for Adoption of Private Sewers) Regulations 2011 are to be plotted over time and may not yet be

    shown.

    In carrying out any works, you accept liability for the

    cost of any repairs to Wessex Water apparatus damaged as a result of your works. You are advised to commence

    excavations using hand tools only. Mechanical digging

    equipment should not be used until pipe work has been precisely located.

    If you are considering any form of building works and

    pipe work is shown within the boundary of your property

    or a property to be purchased (or very close by) a surveyor should plot its exact position prior to

    commencing works or purchase. If you are proposing to

    build over or near Wessex Water’s apparatus you should contact the Developer Services Team, tel: 01225 526333

    or e-mail: [email protected] to

    discuss your proposals to discuss your proposals.

    Brookfield Nurseries

    Ruishton, Taunton

    04/11/2019 14:56

    325943.58 , 124985.28

  • TECHNICAL DESIGN NOTE

    TECHNICAL DESIGN NOTE | Land at Brookfield Nurseries, Ruishton | 13830-HYD-XX-XX-RP-D-5001 | 2 January 2020 8

    APPENDIX C

    Drainage Constraints Plan

    Micro Drainage Source Control Calculations

  • Hydrock Consultants Ltd Page 1. Brookfield Nurseries. Ruishton. Preliminary Storage BasinDate 16/12/2019 14:46 Designed by DPFile QBAR AND QSE V2.SRCX Checked byInnovyze Source Control 2018.1

    Summary of Results for 100 year Return Period (+40%)

    ©1982-2018 Innovyze

    StormEvent

    MaxLevel(m)

    MaxDepth(m)

    MaxControl(l/s)

    MaxOverflow(l/s)

    MaxΣ Outflow(l/s)

    MaxVolume(m³)

    Status

    15 min Summer 9.333 0.333 16.0 0.0 16.0 769.9 O K30 min Summer 9.439 0.439 16.0 0.0 16.0 1030.5 O K60 min Summer 9.549 0.549 16.0 0.0 16.0 1308.6 O K120 min Summer 9.657 0.657 16.0 0.0 16.0 1589.4 O K180 min Summer 9.715 0.715 16.0 0.0 16.0 1742.5 Flood Risk240 min Summer 9.750 0.750 16.0 0.0 16.0 1836.9 Flood Risk360 min Summer 9.797 0.797 16.0 0.0 16.0 1965.4 Flood Risk480 min Summer 9.824 0.824 16.0 0.0 16.0 2039.7 Flood Risk600 min Summer 9.840 0.840 16.0 0.0 16.0 2083.5 Flood Risk720 min Summer 9.848 0.848 16.0 0.0 16.0 2107.6 Flood Risk960 min Summer 9.852 0.852 16.0 0.0 16.0 2117.8 Flood Risk1440 min Summer 9.839 0.839 16.0 0.0 16.0 2082.1 Flood Risk2160 min Summer 9.811 0.811 16.0 0.0 16.0 2004.6 Flood Risk2880 min Summer 9.778 0.778 16.0 0.0 16.0 1913.8 Flood Risk4320 min Summer 9.702 0.702 16.0 0.0 16.0 1709.6 Flood Risk5760 min Summer 9.620 0.620 16.0 0.0 16.0 1491.7 O K7200 min Summer 9.546 0.546 16.0 0.0 16.0 1301.4 O K8640 min Summer 9.480 0.480 16.0 0.0 16.0 1133.3 O K10080 min Summer 9.421 0.421 16.0 0.0 16.0 984.8 O K

    15 min Winter 9.372 0.372 16.0 0.0 16.0 863.8 O K30 min Winter 9.490 0.490 16.0 0.0 16.0 1156.7 O K60 min Winter 9.612 0.612 16.0 0.0 16.0 1470.2 O K120 min Winter 9.732 0.732 16.0 0.0 16.0 1789.7 Flood Risk180 min Winter 9.796 0.796 16.0 0.0 16.0 1963.2 Flood Risk240 min Winter 9.835 0.835 16.0 0.0 16.0 2070.6 Flood Risk

    StormEvent

    Rain(mm/hr)

    FloodedVolume(m³)

    DischargeVolume(m³)

    OverflowVolume(m³)

    Time-Peak(mins)

    15 min Summer 130.405 0.0 690.8 0.0 2630 min Summer 87.611 0.0 930.9 0.0 4160 min Summer 56.129 0.0 1296.4 0.0 70120 min Summer 34.675 0.0 1601.8 0.0 130180 min Summer 25.749 0.0 1779.9 0.0 190240 min Summer 20.687 0.0 1900.9 0.0 248360 min Summer 15.234 0.0 2083.7 0.0 366480 min Summer 12.237 0.0 2209.7 0.0 486600 min Summer 10.316 0.0 2298.2 0.0 604720 min Summer 8.967 0.0 2355.6 0.0 722960 min Summer 7.182 0.0 2380.1 0.0 9601440 min Summer 5.242 0.0 2260.2 0.0 12082160 min Summer 3.818 0.0 3257.5 0.0 15842880 min Summer 3.045 0.0 3453.1 0.0 19924320 min Summer 2.209 0.0 3713.3 0.0 28165760 min Summer 1.757 0.0 4044.2 0.0 35847200 min Summer 1.472 0.0 4231.3 0.0 43288640 min Summer 1.274 0.0 4388.6 0.0 509610080 min Summer 1.128 0.0 4514.7 0.0 5760

    15 min Winter 130.405 0.0 776.5 0.0 2630 min Winter 87.611 0.0 1037.0 0.0 4160 min Winter 56.129 0.0 1453.1 0.0 70120 min Winter 34.675 0.0 1790.3 0.0 128180 min Winter 25.749 0.0 1984.7 0.0 186240 min Winter 20.687 0.0 2114.6 0.0 244

  • Hydrock Consultants Ltd Page 2. Brookfield Nurseries. Ruishton. Preliminary Storage BasinDate 16/12/2019 14:46 Designed by DPFile QBAR AND QSE V2.SRCX Checked byInnovyze Source Control 2018.1

    Summary of Results for 100 year Return Period (+40%)

    ©1982-2018 Innovyze

    StormEvent

    MaxLevel(m)

    MaxDepth(m)

    MaxControl(l/s)

    MaxOverflow(l/s)

    MaxΣ Outflow(l/s)

    MaxVolume(m³)

    Status

    360 min Winter 9.889 0.889 16.0 0.0 16.0 2220.0 Flood Risk480 min Winter 9.920 0.920 16.0 0.0 16.0 2309.6 Flood Risk600 min Winter 9.940 0.940 16.0 0.0 16.0 2365.5 Flood Risk720 min Winter 9.952 0.952 16.0 0.0 16.0 2399.5 Flood Risk960 min Winter 9.961 0.961 16.0 0.0 16.0 2426.1 Flood Risk1440 min Winter 9.949 0.949 16.0 0.0 16.0 2390.3 Flood Risk2160 min Winter 9.911 0.911 16.0 0.0 16.0 2283.4 Flood Risk2880 min Winter 9.867 0.867 16.0 0.0 16.0 2159.7 Flood Risk4320 min Winter 9.764 0.764 16.0 0.0 16.0 1875.6 Flood Risk5760 min Winter 9.639 0.639 16.0 0.0 16.0 1540.8 O K7200 min Winter 9.523 0.523 16.0 0.0 16.0 1242.7 O K8640 min Winter 9.424 0.424 16.0 0.0 16.0 991.7 O K10080 min Winter 9.340 0.340 16.0 0.0 16.0 786.1 O K

    StormEvent

    Rain(mm/hr)

    FloodedVolume(m³)

    DischargeVolume(m³)

    OverflowVolume(m³)

    Time-Peak(mins)

    360 min Winter 15.234 0.0 2301.9 0.0 360480 min Winter 12.237 0.0 2413.8 0.0 476600 min Winter 10.316 0.0 2465.5 0.0 592720 min Winter 8.967 0.0 2464.1 0.0 706960 min Winter 7.182 0.0 2414.6 0.0 9281440 min Winter 5.242 0.0 2307.4 0.0 13482160 min Winter 3.818 0.0 3644.6 0.0 16842880 min Winter 3.045 0.0 3858.7 0.0 21404320 min Winter 2.209 0.0 4101.0 0.0 30725760 min Winter 1.757 0.0 4530.7 0.0 39127200 min Winter 1.472 0.0 4741.6 0.0 46168640 min Winter 1.274 0.0 4919.4 0.0 536010080 min Winter 1.128 0.0 5064.6 0.0 5960

  • Hydrock Consultants Ltd Page 3. Brookfield Nurseries. Ruishton. Preliminary Storage BasinDate 16/12/2019 14:46 Designed by DPFile QBAR AND QSE V2.SRCX Checked byInnovyze Source Control 2018.1

    Rainfall Details

    ©1982-2018 Innovyze

    Rainfall Model FSR Winter Storms YesReturn Period (years) 100 Cv (Summer) 0.750

    Region England and Wales Cv (Winter) 0.840M5-60 (mm) 19.800 Shortest Storm (mins) 15

    Ratio R 0.350 Longest Storm (mins) 10080Summer Storms Yes Climate Change % +40

    Time Area Diagram

    Total Area (ha) 3.210

    TimeFrom:

    (mins)To:

    Area(ha)

    TimeFrom:

    (mins)To:

    Area(ha)

    TimeFrom:

    (mins)To:

    Area(ha)

    0 4 1.070 4 8 1.070 8 12 1.070

  • Hydrock Consultants Ltd Page 4. Brookfield Nurseries. Ruishton. Preliminary Storage BasinDate 16/12/2019 14:46 Designed by DPFile QBAR AND QSE V2.SRCX Checked byInnovyze Source Control 2018.1

    Model Details

    ©1982-2018 Innovyze

    Storage is Online Cover Level (m) 10.000

    Tank or Pond Structure

    Invert Level (m) 9.000

    Depth (m) Area (m²) Depth (m) Area (m²)

    0.000 2203.0 1.000 2886.0

    Hydro-Brake® Optimum Outflow Control

    Unit Reference MD-SHE-0180-1600-1000-1600Design Head (m) 1.000

    Design Flow (l/s) 16.0Flush-Flo™ CalculatedObjective Minimise upstream storage

    Application SurfaceSump Available YesDiameter (mm) 180

    Invert Level (m) 9.000Minimum Outlet Pipe Diameter (mm) 225Suggested Manhole Diameter (mm) 1500

    Control Points Head (m) Flow (l/s) Control Points Head (m) Flow (l/s)

    Design Point (Calculated) 1.000 16.0 Kick-Flo® 0.706 13.6Flush-Flo™ 0.324 16.0 Mean Flow over Head Range - 13.6

    The hydrological calculations have been based on the Head/Discharge relationship for the Hydro-Brake®Optimum as specified. Should another type of control device other than a Hydro-Brake Optimum® beutilised then these storage routing calculations will be invalidated

    Depth (m) Flow (l/s) Depth (m) Flow (l/s) Depth (m) Flow (l/s) Depth (m) Flow (l/s) Depth (m) Flow (l/s)

    0.100 6.3 0.800 14.4 2.000 22.3 4.000 31.0 7.000 40.70.200 15.4 1.000 16.0 2.200 23.3 4.500 32.9 7.500 42.10.300 16.0 1.200 17.4 2.400 24.3 5.000 34.6 8.000 43.40.400 15.9 1.400 18.8 2.600 25.2 5.500 36.2 8.500 44.70.500 15.6 1.600 20.0 3.000 27.0 6.000 37.7 9.000 45.90.600 15.0 1.800 21.2 3.500 29.1 6.500 39.2 9.500 47.2

    Weir Overflow Control

    Discharge Coef 0.544 Width (m) 0.500 Invert Level (m) 10.000

  • APPROXIMATE LOCATION OF

    SEPTIC TANK AS SHOWN ON

    DEVELOPMENT CONSTRAINTS

    PLAN SUPPLIED BY CLIENT

    POND WITH STANDING WATER.

    POSSIBLE DISCHARGE POINT

    FOR EXISTING DRAINED AREA?

    V

    V

    V

    V

    V

    V

    V

    V

    V

    V

    V

    V

    V

    V

    V

    V

    V

    APPROXIMATE ROUTE OF

    COMBINED SEWER TAKEN

    FROM WESSEX WATER PLANS

    APPROXIMATE ROUTE OF

    COMBINED SEWER TAKEN

    FROM WESSEX WATER PLANS

    POTENTIAL ADOPTABLE FOUL PUMPING

    STATION (12m x 8m) WITH A 15m

    HABITABLE DWELLING BUFFER

    10m MINIMUM FROM TOP OF BANK

    APPROXIMATE LOCATION OF

    SEPTIC TANK AS SHOWN ON

    DEVELOPMENT CONSTRAINTS

    PLAN SUPPLIED BY CLIENT

    APPROXIMATE LOCATION OF

    FILTER BED AS SHOWN ON

    DEVELOPMENT CONSTRAINTS

    PLAN SUPPLIED BY CLIENT

    APPROXIMATE LOCATION OF

    SEPTIC TANK AS SHOWN ON

    DEVELOPMENT CONSTRAINTS

    PLAN SUPPLIED BY CLIENT

    PLANS PROVIDED BY THE

    CLIENT INDICATE THAT

    SEPTIC TANKS DISCHARGE TO

    POND

    REQUIRED PLAN AREA FOR ATTENUATION

    BASIN (2,426m²) BASED ON MICRO

    DRAINAGE QUICK STORE CALCULATIONS

    FOR A 1m DEEP BASIN WITH 1 IN 3 SIDE

    SLOPES. BASIN PROVIDES 2536m³ OF

    SURFACE WATER STORAGE. BASIN SIZED

    ASSUMING A 65% IMPERMEABLE COVERAGE

    OF LAND OUTSIDE OF FLOOD ZONE 3 AND A

    QBAR RUNOFF RATE OF 5 l/s/ha.

    BASIN AREA DOES NOT INCLUDE AREA

    REQUIRED FOR GROUNDWORKS

    BROOKFIELD NURSERIES

    B

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    F

    I

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    N

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    S

    GREENHOUSE

    GREENHOUSE

    GREENHOUSE

    G

    R

    E

    E

    N

    H

    O

    U

    S

    E

    NEIGHBOURING PROPERTY

    N

    E

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    O

    U

    R

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    N

    G

    P

    R

    O

    P

    E

    R

    T

    Y

    NEIGHBOURING PROPERTY

    R

    U

    I

    S

    H

    T

    O

    N

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    A

    N

    E

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    U

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    T

    O

    N

    L

    A

    N

    E

    NEIGHBOURING PROPERTY

    F1

    F2

    F3

    S1

    S11

    S2

    S3

    S4

    S5

    S6

    S7

    S8

    S9

    B

    L

    A

    C

    K

    B

    R

    O

    O

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    B

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    A

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    APPROXIMATE ROUTE OF

    PROPOSED RISING MAIN.

    ACTUAL ALIGNMENT TO SUIT

    PLANNING LAYOUT

    TAYLOR WIMPEY

    LAND AT BROOKFIELDNURSERIES, RUISHTON

    C-13830-C 1 : 500

    INFORMATION

    13830-HYD-XX-XX-DR-C-2200

    DRAINAGE CONSTRAINTS PLAN

    DRAWING NO. (PROJECT CODE-ORGINATOR-ZONE-LEVEL-TYPE-ROLE-NUMBER)

    SCALE @ A0

    REVISION

    HYDROCK PROJECT NO.

    STATUS

    TITLE

    PROJECT

    CLIENT

    STATUS DESCRIPTION

    REVISIONS

    OVER COURT BARNSOVER LANEALMONDSBURYBRISTOLBS32 4DFt: +44 (0) 1454 619533e: [email protected]

    S2

    P03

    OS NORTH

    Rev Date Description By Ckd App

    P01 05/11/19 First Issue. DP RJH RJH

    KEY

    FLOOD ZONE 3

    FLOOD ZONE 2

    OVERLAND FLOW PATH

    EXISTING PUBLIC FOUL

    SEWER

    EXISTING PUBLIC COMBINED

    SEWER

    PROPOSED FOUL RISING MAIN (approximate route)

    5m EASEMENT WIDTH TO RIVER BANK

    (NB:Unclear from survey where exact location of top of

    bank is)

    P02 04/12/19 Storage amended from tank to basin DP RJH RJHP03 02/01/20 Storage volume amended. DP RJH RJH

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    AutoCAD SHX TextHT 8m

    AutoCAD SHX TextG 0.5

    AutoCAD SHX TextHT 6m

    AutoCAD SHX TextG 1.3

    AutoCAD SHX TextHT 12m

    AutoCAD SHX TextG 0.3

    AutoCAD SHX TextHT 6m

    AutoCAD SHX TextG 0.3

    AutoCAD SHX TextHT 4m

    AutoCAD SHX TextG 0.3

    AutoCAD SHX TextHT 5m

    AutoCAD SHX TextG 0.2

    AutoCAD SHX TextHT 5m

    AutoCAD SHX TextG 0.4

    AutoCAD SHX TextHT 5m

    AutoCAD SHX TextG 0.6

    AutoCAD SHX TextHT 7m

    AutoCAD SHX TextG 0.2

    AutoCAD SHX TextHT 3m

    AutoCAD SHX TextG 0.2

    AutoCAD SHX TextHT 3m

    AutoCAD SHX TextG 0.7

    AutoCAD SHX TextHT 8m

    AutoCAD SHX TextG 0.9

    AutoCAD SHX TextHT 9m

    AutoCAD SHX TextG 0.3

    AutoCAD SHX TextHT 5m

    AutoCAD SHX TextG 0.4

    AutoCAD SHX TextHT 6m

    AutoCAD SHX TextG 0.6

    AutoCAD SHX TextHT 7m

    AutoCAD SHX TextG 0.6

    AutoCAD SHX TextHT 8m

    AutoCAD SHX TextG 0.3

    AutoCAD SHX TextHT 3m

    AutoCAD SHX TextG 0.1

    AutoCAD SHX TextHT 2m

    AutoCAD SHX TextG 0.3

    AutoCAD SHX TextHT 6m

    AutoCAD SHX TextG 0.4

    AutoCAD SHX TextHT 5m

    AutoCAD SHX TextG 0.2

    AutoCAD SHX TextHT 5m

    AutoCAD SHX TextG 0.3

    AutoCAD SHX TextHT 5m

    AutoCAD SHX TextG 0.4

    AutoCAD SHX TextHT 5m

    AutoCAD SHX TextG 0.5

    AutoCAD SHX TextHT 5m

    AutoCAD SHX TextG 0.2

    AutoCAD SHX TextHT 4m

    AutoCAD SHX TextG 0.7

    AutoCAD SHX TextHT 8m

    AutoCAD SHX TextG 0.5

    AutoCAD SHX TextHT 5m

    AutoCAD SHX TextG 0.5

    AutoCAD SHX TextHT 6m

    AutoCAD SHX TextG 0.2

    AutoCAD SHX TextHT 5m

    AutoCAD SHX TextG 0.2

    AutoCAD SHX TextHT 5m

    AutoCAD SHX TextG 0.2

    AutoCAD SHX TextHT 4m

    AutoCAD SHX TextG 1.0

    AutoCAD SHX TextHT 10m

    AutoCAD SHX TextG 0.4

    AutoCAD SHX TextHT 5m

    AutoCAD SHX TextG 0.3

    AutoCAD SHX TextHT 5m

    AutoCAD SHX TextG 0.5

    AutoCAD SHX TextHT 6m

    AutoCAD SHX TextG 0.2

    AutoCAD SHX