Mactaggart & Mickel Homes Proposed Residential Development at Quarry Road, Kilmacolm Outline Drainage Strategy September

Mactaggart & Mickel Homes

Proposed Residential

Development at Quarry Road, Kilmacolm

Outline Drainage Strategy

September 2020

Document Ref: 125856/GL/S/R02

Quarry Road, Kilmacolm

Outline Drainage Strategy

CONTROL SHEET

CLIENT: Mactaggart & Michel Homes

PROJECT TITLE: Quarry Road, Kilmacolm

REPORT TITLE: Outline Drainage Srategy

PROJECT REFERENCE: 125856

DOCUMENT NUMBER: 125856/GL/S/R02

STATUS: For Planning

Name Signature Date

Prepared by Scott Robertson Signed copy held on file. 28/09/2020

val Schedule val

Checked by Jim McLaughlin Signed copy held on file. 28/09/2020

Approved by John Ross Signed copy held on file. 28/09/2020

Issue & Issue Appro &

Rev. Date Status Description Signature

Check

Approve

Revision Record Revision Check

Approve

This document has been prepared in accordance with procedure OP/P02 of the Fairhurst Quality and Environmental Management System

This document has been prepared in accordance with the instructions of the client, Mactaggart & Mickel for the client’s sole and specific use. Any other persons who use any information contained herein do so at their own risk.

125856/GL/S/R02, September 2020 Quarry Road, Kilmacolm

Outline Drainage Strategy

Contents

1.0 Introduction ...... 1 2.0 Site Description and Topography...... 2 3.0 Existing Drainage Networks ...... 3 4.0 Proposed Surface Water Drainage & SUDS ...... 4 5.0 Proposed Foul Water Drainage ...... 7 6.0 Water Management during Construction ...... 8 7.0 Summary and Conclusions ...... 9

Appendices:-

Appendix A: Location Plan Appendix B: Scottish Water Drainage Records Appendix C: Scottish Water PDE Response Appendix D: Proposed Conceptual Drainage Layout Appendix E: Overland Flow Drawings Appendix F: Existing Drainage Catchment Area & Greenfield Runoff Rate Calculations Appendix G: Simple Index Approach Tool Results Appendix H: Post Development Foul Discharge Calculations

125856/GL/S/R02, September 2020 Quarry Road, Kilmacolm

Outline Drainage Strategy

1.0 Introduction

Fairhurst, Consulting Engineers have been appointed by Mactaggart & Mickel to advise on drainage and SUDS matters for the proposed residential site at Quarry Drive, Kilmacolm. This report will support the Planning Permission in Principle (PPiP) Application and describe, in principal, the permanent drainage and SUDS related measures that will be incorporated within the full detailed design for the development.

The purpose of this report is to assess the foul and surface water run-off from the proposed development and demonstrate how the proposed drainage infrastructure impacts on the existing network and highlight, where applicable, any risks or mitigation methods required to ensure little or no risk is imposed on the network as a result of this development. This report will identify the existing hydrological regime and provide details of the outline surface water drainage strategy, and surface water management plan, which will be designed in compliance with the relevant guidance documents outlined below:

A site location plan for the development is included within Appendix A.

 Sewers for Scotland 4th Edition (October 2018)  CIRIA The SUDS Manual (C753)  Report No. 124 Flood estimation for small catchments (IH124)  Drainage Assessment - A Guide for Scotland  SPP7 - Planning and Flooding  Inverclyde Council – Flood Risk Assessment and Drainage Impact Assessment – Planning Guidance for Developers

125856/GL/S/R02, September 2020 1 Quarry Road, Kilmacolm

Outline Drainage Strategy

2.0 Site Description and Topography

The development site is located to the north of the village of Kilmacolm, situated approximately 10 miles west of Paisley town centre. A site location plan is attached within Appendix A.

It is understood that the proposed development plan for the site consists of 78 residential units, together with associated access roads as well as resident and visitor parking, drainage and infrastructure.

The area of the site is approximately 5.07 Hectares and is centred on National Grid Reference NS 35512 70545. The site is bound to the east and to the south by local residential properties. To the north the site is bound by farmland and to the west by an existing access road serving the nearby Kilmacolm Cemetery.

A review of the existing topography of the site shows that the ground generally falls from the north west of the site to the south east, to the existing roundabout.

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Outline Drainage Strategy

3.0 Existing Drainage Networks

Scottish Water records indicate that there are existing combined sewers serving the surrounding residential areas and the local road network. A culverted watercourse is present to the east of the development and is thought to route south towards the Gryffe Water.

Scottish Water sewer records indicate the presence of a 225mm diameter combined sewer along the south western boundary of the site. This sewer is suspected to take existing drainage flows from local residential areas to the west of the development site and properties immediately to the south.

An existing field drain is located to the north east of the development and is thought to discharge to the culverted watercourse to the east. It is suspected that the existing field drain captures historical pluvial flows from an area of the development site, and perhaps beyond to the west.

Scottish Water sewer record plans are included within Appendix B.

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Outline Drainage Strategy

4.0 Proposed Surface Water Drainage & SUDS

4.1 Drainage Design

Current planning advice and best practice recommends that the disposal of surface water runoff from new developments shall take into account Sustainable Urban Drainage Systems (SUDS) principles in accordance with current legislation and guidelines using up to date techniques and to ensure that the rate and volume of water runoff, from the post- development situation, does not exceed the greenfield surface water runoff from the existing site.

Based on current guidelines, run-off from the development site should be attenuated up to and including the 1 in 30 year storm event plus allowance for Climate change. Checks should also be carried out up to and including the 1 in 200 year storm event, plus allowance for climate change, with any flooding being identified and flow paths clearly shown.

In accordance with current Scottish Water Guidelines, an assessment has been made on the proposed outfall option based on the preferred hierarchy outlined in Surface Water Policy standard advice note and process guidance document.

Option 1: Rainwater is stored and reused. This option has been ruled out due to the nature of the development. There is no great demand for non-potable water for the residential site and the increased costs associated with installing this type of system are unviable.

Option 2: Surface water drained into the soil through the use of a soakaway. Although there is no information on percolation or infiltration testing, given the topography of the existing site and the close proximity to two unnamed drainage ditches, that may be susceptible to flooding this option has been ruled out.

Option 3: Surface water is drained to a watercourse. Initial investigations found that there is an unnamed culverted watercourse running southward along the eastern boundary of the site. As this watercourse exists within close proximity of the site, we propose that the surface water from the proposed site discharges to this at an attenuated rate that mimics the Greenfield run-off rate, keeping within the local authority guidelines.

The existing topography of the site is such that some of the pluvial flow from the site drains to the existing unnamed culverted watercourse, located to the east of the site, via existing field drainage. A drawing detailing the existing catchment area of the field drainage has been provided within Appendix F along with Greenfield run-off calculations for the contributing area. It is proposed that the post development discharge rate is limited to the existing Greenfield run-off rate from the site. As such only the existing catchment area that drains to the culvert has been used to determine the post development discharge rate.

In accordance with the ‘Inverclyde Council: Flood Risk Assessment and Drainage Impact Assessment – Planning Guidance for Developers’ the post development site discharge rate is to be limited to the 1 in 2 year Greenfield run-off rate for all storms up to the 1 in 200 year critical storm event, inclusive of 30% climate change and 10% urban expansion.

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Outline Drainage Strategy

The allowable post development discharge rate, in line with the existing discharge, is as follows: Q = Existing Catchment Area x 2 Year Greenfield Run-off Rate Q = 1.25Ha x 10.52l/s Q = 13.15 l/s

Attenuation of the post development flows will be provided by means of a detention basin located to the east of the development site. Discharge from the detention basin will be restricted by means of a Hydrobrake prior to discharging to the existing culverted watercourse.

The proposed surface water drainage system will be designed to prevent any flooding up to the 1 in 200 year rainfall event with all waters retained within the development site. However, should a blockage occur within the pipe system, overland flow may occur. Indicative overland flow routes have been analysed across the development and a drawing illustrating this can be found within Appendix E. Post development flow patterns are similar to those that would take place presently in extreme circumstances.

Residual flood risk to the proposed development from potential sewer flooding will be mitigated by measures taken to alleviate overland flood risk. This includes setting finished floor levels higher than the surrounding ground level and profiling the site ground levels to route water away from buildings.

Scottish Water and Inverclyde Council will be invited to form an agreement with regards to the ongoing shared maintenance and management of the surface water drainage system. This proposed agreement shall be in accordance with Section 7 of the Sewerage (Scotland) Act and will be progressed through the relevant technical submissions to the statutory authorities. The Outline Drainage Strategy Report has been prepared in recognition of this requirement.

4.2 SUDS

As the proposed development site is considered to be at low risk activity in terms of The Water Environment (Controlled Activities) (Scotland) Regulations 2013 (CAR), the surface water discharges from the development to the water environment is covered by the General Binding Rules (GBR) authorisation of the regulations. GBR activities taking place in accordance with these rules are considered as an authorisation and the operator is not required to contact SEPA with respect to surface water discharges.

The relevant GBRs relating to surface water discharge require the proposed development to be drained via SUDS to ensure that the surface water runoff from the development does not affect water quality in the received water environment.

Current SEPA policy requires management of water quality in receiving surface waters and groundwaters as well as ensuring the system designed is able to cope with future change. To ensure the selected SUDS features for the development are suitable in reaching the

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Outline Drainage Strategy

required pollutant mitigation indices, the Simple Index Approach (SIA) Tool was used. A summary of hardstanding areas, and suggested treatment measures, are noted below and results of the SIA tool for each can be found in Appendix G.

Driveways/Private Carpark Areas

Driveways & parking areas will generally give rise to runoff of low quality with a medium to high reaction time. The proposed SUDS treatment for these areas is provided at source via permeable paving suitably placed in parking areas with an underlying stone subbase to treat the surface water runoff. The outfall from the stone subbase, which should be lined with an impermeable membrane, will discharge into the development surface water drainage system where it will be conveyed to onsite attenuation. The attenuation will be designed to allow for the volume of water anticipated in the 200 year storm event plus allowance for climate change, thus protecting for the future change.

Roof Areas

Roofed areas will generally give rise to runoff of medium to high quality with a rapid reaction time. Using the SIA, as shown in Appendix G, by conveying the runoff to sub-base of the permeable paving suitably placed within driveways, the pollutant mitigation indices would be adequately achieved. Flows from roof areas have been taken into account when sizing the onsite attenuation.

Road and Parking Areas

Roads will generally give rise to runoff of low quality with a medium to high reaction time. As shown in Appendix E, by conveying the runoff to the end of line detention basin, the pollution mitigation indices would be adequately achieved. Flows from the road areas have been taken into account when sizing the onsite attenuation.

Regular inspection and maintenance of a SUDS system will ensure that it is fit for purpose and operates as designed. Inspection and maintenance responsibilities should be placed with a responsible organisation and be in accordance with the recommendations set out within The SUDS Manual (CIRIA 2015).

A copy of the proposed drainage layout can be found in Appendix D.

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Outline Drainage Strategy

5.0 Proposed Foul Water Drainage

A Pre-Development Enquiry was submitted to Scottish Water in respect of foul discharges associated with the proposed development. Scottish Water’s letter of response is included in Appendix C. This letter confirms that there are no treatment work capacity issues. However, Scottish Water have requested that a Drainage Impact Assessment (DIA) is carried out to ensure that the local sewer network can adequately service the development. Scottish Water are carrying out an in-house Catchment Performance Assessment (CPA) of the local drainage network which captures the Stage 1 aspect of a standard DIA. Most recent correspondence received from Scottish Water, from April 2020, suggested that the modelling work of the CPA will be completed in June 2020, with the final report to follow.

It is proposed that the new foul sewer network, serving this development, will connect and discharge to the existing Scottish Water network at MH 6403 and MH 5501 which are located to the east of the site. As part of the proposed works it is proposed to divert part of the existing combined sewer, located along the south western boundary of the site, to the new foul drainage system. The proposed diversion involves the abandonment of the existing combined sewer, between manholes MH 2501 and MH 3402, with all existing flows upstream of MH 2501 routed through the new foul drainage network. It is assumed at this time that no positive connections are present between MH 2501 and MH 3402. Scottish Water records are located within Appendix B and the proposed drainage layout is located within Appendix D.

Based on the current site layout proposals, foul discharge for the development has been estimated as:

Average: 0.361 l/sec

Peak: 0.820 l/sec

(Appendix H – Post Development Discharge Rates)

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Outline Drainage Strategy

6.0 Water Management during Construction

The proposed development has the potential to impact on the water quality of the receiving groundwater, both during construction phase and on completion of the development. Given the sensitive nature of natural watercourses, all measures to treat surface water runoff should be in place prior to works commencing.

The potential risk of construction phase pollution can be significantly reduced by implementing good site practice and following the guidance outlined in the Guidance for Pollution Prevention(GPPs) ; PPG1: Understanding your environmental responsibilities – good environmental practices, GGP5: Works and maintenance in or new water, PPG6: Working at construction and demolition sites published by NetRegs. The CIRIA Manual C532 – Control of water pollution from construction sites. Guidance for consultants and contractors provides further guidance and should be consulted prior to works commencing on site.

Current SEPA guidelines require all construction sites, which satisfy the following criteria, to obtain a construction site licence and to prepare a pollution prevention plan prior to the commencement of works:

 Have an area greater than 4 hectares;  Include a road, track or other linear structure of greater than 5km in length; or  Have an area of more than 1 hectare or a length of more than 500 meters on ground with a slope in excess of 25 degrees.

Given that the site area of this development exceeds 4 hectares, a construction site licence will be required

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Outline Drainage Strategy

7.0 Summary and Conclusions

The Outline Drainage Strategy Report for the proposed residential development at Quarry Road, Kilmacolm is aimed at producing a suitable drainage solution to meet the requirements of all relevant authorities and to support the Planning Permission in Principal (PPiP) application for the development site.

It is considered that due to the small foul flows proposed that the existing wastewater network will be capable of accepting the flow discharge proposed providing no significant changes have been made to the Scottish Water network since the submission of the PDE. However, confirmation of this is awaited from Scottish Water as part of an in-house Catchment Performance Assessment.

The proposed surface water attenuation system will be designed to restrict the post development flows to mimic the pre-development discharge rate. This will prevent excessive discharge to the existing combined sewer network.

Attenuation of all storm events up to and including the critical 1 in 200 year storm event (inclusive of 30% climate change + 10% urban expansion) will be accommodated within the proposed drainage network to serve the development, ensuring no detrimental impact on the downstream drainage network or surrounding areas.

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Outline Drainage Strategy

Appendix A

Location Plan

125856/GL/S/R02, September 2020 © Quarry Road, Kilmacolm

Outline Drainage Strategy

Appendix B

Scottish Water Drainage Record Plans

125856/GL/S/R02, September 2020

Quarry Road, Kilmacolm

Outline Drainage Strategy

Appendix C

Scottish Water PDE Response

125856/GL/S/R02, September 2020 15th June 2018

Fairhurst 225 Bath Street Development Operations The Bridge Glasgow Buchanan Gate Business Park G2 4GZ Cumbernauld Road Stepps Glasgow G33 6FB

Development Operations Free phone Number - 0800 389 0379 Dear Mr Svilis E-Mail - [email protected] www.scottishwater.co.uk

PA13 Kilmacolm Quarry Road Land Adjacent to Pre-Development Enquiry Application – Network Assessment Required Your Ref: 125856-KILMACOLM Our Ref: 761887

Thank you for your application regarding the above proposed development. Please note our reference number, which should be quoted on all future correspondence.

Following a capacity review we can now confirm the following:

Assessment of capacity at our treatment works:

 There is currently sufficient capacity in the Kaim Water Treatment Works to service your development.

 There is currently sufficient capacity in the Erskine Waste Water Treatment works to service your development.

Assessment of our network:

Further studies are required to be carried out to determine if our existing water network can adequately service the demands of your development.

Water: A Flow and Pressure test (F&PT) is required for this development.

You may appoint your preferred consultant to undertake these works, or alternatively, if you wish Scottish Water to obtain a quote on your behalf we will arrange this via one of our commercial partners who will contact you directly.

Please contact me to confirm how you wish to proceed with these works.

In addition to this: it will also be necessary to carry out an impact assessment to determine if our existing network can adequately service the demands of your development or if any mitigation/enhancement work is required -

Wastewater: A Drainage Impact Assessment (DIA) is required for a development of this size.

If you have any questions in relation to the network assessment, contact us at WIA/[email protected]

Scottish Water is committed to assisting development in Scotland and has funding under our current investment period to upgrade our water and waste water treatment works however our regulations from the Scottish Executive for our current investment programme (2015-2021) state that should your development require Scottish Water networks to be upgraded this cost will have to be met by the developer; Scottish Water may contribute towards the cost of these works, including the required study, via Reasonable Cost Contribution regulations.

Please Note:

 Water point of connection (POC) can be taken from 4” main on Port Glasgow Road or 4” main on Springwood Drive. Please note exact point of connection will be confirmed at technical design stage once you have submitted a formal technical application.  Please note the above capacity response for Waste Water treatment is for foul only.  All surface water must be discharged to a watercourse, which will require permission from the local authority and SEPA.  If connecting to the culvert will need to discuss this with local authority flooding team to confirm capacity.  All foul and surface water must be kept separate within site.  Ensure as part of the drainage impact assessment that the CSO CSO000479 – Kilmacolm, No3 (Whitelea Crescent) is included.

General Notes:

Please be advised that Scottish Water will only accept surface water into the combined network under exceptional circumstances. In the consideration of any development, if due diligence has been carried out in fully investigating the available options for surface water drainage and if any of these options is subsequently deemed unreasonable to pursue, the remaining alternative options can then be considered for approval to allow the development to proceed.

Scottish Water's current minimum level of service for water pressure is 1.0 bar or 10m head in the public main. Any property which cannot be adequately serviced using this pressure may require private pumping arrangements installed, subject to compliance with the current water byelaws.

Scottish Water is unable to reserve capacity and connections to the water & wastewater networks can only be granted on a first come first served basis. For this reason we may have to review our ability to serve the development on receipt of an application to connect.

If you have any general questions or require a site visit, please contact our Central Support Mailbox at [email protected] where our team will be happy to assist you.

Yours sincerely

Emma Taylor Development Operations Technical Analyst [email protected] Quarry Road, Kilmacolm

Outline Drainage Strategy

Appendix D

Proposed Conceptual Drainage Layout

125856/GL/S/R02, September 2020 112.68 110.49 112.88 109.75 GB5 109.97 110.38 112.80 113.05 110.88 112.84 109.28 109.67 113.52 113.12 109.98 110.63 109.85 108.81

109.18

113.31 113.63 Post & Wire 1.0m Wire & Post 113.41 109.65 108.36 110.21 108.81 114.02 G 113.68 108.10

109.08

Gravel 109.90

108.26 108.94

113.86 Road Port Glasgow Port

114.35 107.74 108.75 107.97 114.71

109.31

LP 108.08 107.51

Tarmac Footpath Tarmac Overhead Telecomms. Line Telecomms. Overhead

114.51 108.19 107.63 107.43

108.90 Wall 1.0m Wall 114.56 114.58

107.88 Stone 107.42 107.32

107.51 Post & Wire 1.0m Wire & Post 1.0m Wall Stone 108.45

115.44 Tarmac Road Tarmac 107.56 107.27 107.42 108.11 107.34 107.18 115.30 107.23 107.30 107.12 107.27 116.02 107.81 G 107.34 107.23 107.67 LP 107.13 116.01 107.18 115.97 116.65 116.43 107.14 107.13 107.48 107.16 107.12 LP 107.01 107.08 116.52 107.10 ER 116.59 CTV 106.80 117.54 107.28 106.98 117.21 116.98 106.91 116.91 106.92 107.20 117.94 117.26 106.49 118.46 107.04 117.48 117.14 106.73 TP 117.84 106.28 118.06

118.81

106.55 118.0 118.26 106.65 116.67 106.17 118.65 118.64 119.74 GB6

116.28 117.5 119.66 106.05 105.65 GB4 119.66 119.48 105.86 116.53

120.54 Stone Wall 1.0m Overhead Telecomms. Line

119.51 119.0 Soil 105.87 120.92 116.45

119.79 Stone Wall 1.0m 118.5 120.71 105.45 120.08 LP 119.61 120.11 120.89

116.52 120.0 119.37 116.50 IC CL

119.56 Tarmac Road 119.78 104.93 105.35 Stone Wall 124.56 P 119.10 105.15 118.92

119.5 121.37 1.0m 119.10 105.13 120.80 121.93

124.77

Gravel 118.64 Port Glasgow Port 121.03

123.09

117.65 120.73 124.26 105.14 Road 118.87

123.79 118.36 119.36

121.31 Tarmac Footpath Tarmac 118.10

118.65 Stone

Pasture Stone Wall 1.0m

121.78 Gravel

Gorse Bushes 121.60 104.95 117.62 Impenetrable 124.61

121.84

Wall 1.0m IC CL 115.67 Chainlink 1.4m Chainlink 120.36 TP 121.28 Stay 118.87 122.93 117.32 P 125.95 122.88

121.02

116.84

124.57 124.17 117.91 117.90 118.67 124.09

116.41 Tarmac Road 104.35 118.36 104.76 Gorse Bushes 117.75 Impenetrable 125.04 104.56 119.00

122.22 IC 104.52

Soil 117.27 117.5 121.55

125.04 116.0 123.11

119.96 Stone Wall 1.0m

116.5 119.42 117.17 117.0 TP 104.52 124.46 124.91

BT 120.5 117.30 125.06 116.29 120.48 Telecomms. Soil 119.69 Overhead 118.26 Bushes 104.50 117.23 Gorse 122.94 125.96 P Line

115.96 121.35 116.00 SC

120.0 116.11 118.64 Bushes 118.99

SC ASHP Soil 103.97 104.35 104.26 104.08

116.52 118.0 117.85

119.51 104.14 104.15 120.44 115.50 EP 115.64 115.61 Pasture 104.15

104.24 119.5 115.17

114.39 104.04 123.22 LP 103.79 121.14 Soil 115.65

104.18

Gravel

104.04 119.0 Chainlink 1.4m Chainlink 119.55

114.75

103.76 117.65

118.5 Post & Wire 1.0m Wire & Post 115.86

120.09

104.06 Wooden

1.2m 103.93 115.52 EP 103.92 115.51

Gorse Bushes Impenetrable 123.0 119.43 103.93 120.83

ASHP 103.71 114.79 115.04 114.22

IC CL

103.94 113.43

Bushes ASHP 103.91 123.26 114.66 114.52 103.64 116.93

115.65

Wooden

1.2m

G 122.5 103.89 SC 103.90

119.62

103.65 Tarmac Footpath Tarmac 114.95 114.18 112.88 G 115.0 103.90 117.99 103.83 ASHP 116.48 115.35 103.72

Overhead Power Line 122.99

Wooden 1.0m Wooden 117.78 120.69 114.11 113.92

122.0 FH 104.19 112.34 114.42 Pasture

113.82

112.84 103.86 117.0 Overhead Power Line Power Overhead IC 104.00 115.5

112.12 116.0 119.17 103.94 113.32 122.37

MH CL 112.34

GV 112.77

104.08 114.0 120.41 112.17 114.69 116.88 BT 104.05

114.15 IC CL 1.0m Wooden BT 121.5 GB7 Pasture 112.23 117.64 112.03 112.03 104.38 104.08

V 114.5 IC 114.36 LP 118.94 V

ASHP 104.15 116.31 Garage 104.14 112.03 IC CL

104.23 121.90 113.0 114.24 104.49 V

104.23

112.29

121.0

119.99 Tarmac Footpath Tarmac

104.30 ASHP 116.5 117.5 113.38 114.07 112.65

117.17

112.5 112.17

104.34

Stone Wall 1.4m Wall Stone 112.41 114.19

120.5 113.38 104.64 Post & Wire 1.1m 113.81 121.43 116.68

104.61 113.5 Gorse

Stone Wall 0.6m 118.44 112.49

116.02 104.52 120.0

104.70 104.48

118.0 113.97 104.65 111.68 111.58 CTV 119.42 104.57 119.5

CTV ASHP 115.29 120.70 SC 116.29 113.35 104.69 112.43 113.69 112.58 116.15

117.75 119.0 116.31

115.22

111.96

104.55 Road Tarmac 104.65 104.65 Wooden 1.0m Wooden 116.42 105.03 104.67

118.5 Pasture LP 106.00 105.73 104.59 MH CL 119.79 116.32 Pasture 104.47

104.74 111.99

104.68 MH CL 106.22 Stone Wall 1.2m Wall Stone

Pasture 106.38 Road Tarmac GB3 114.82 105.07 104.51 112.49 105.95 112.41 105.78 MH CL 117.27 104.64

107.44 Stone Wall 1.1m Wall Stone 104.45 117.54 113.38 111.60 113.72

106.37 104.42 104.35 115.0 111.70 105.23 105.04 104.77 118.82 114.45 108.96 116.93 104.42

106.10 Stone Wall 1.4m Post & Wire 1.1m 104.30 107.26 106.05 116.31 109.09 CTV

107.75 Stone Wall 0.6m 112.16 104.27 104.23 118.40

105.44 112.16 117.0 104.84 107.40 CTV EP 104.30 110.05 115.76 104.66 110.84 107.24 Tarmac Road

106.07 Stone Wall 1.4m 110.41 V V 118.21

Gravel 110.84 Tarmac Footpath Tarmac 104.39

Stone Wall 1.5m 115.5

118.18 112.05 114.0

111.60

104.13 104.05 108.46 108.85 116.0

Stay 117.97

110.30

114.5 Tarmac Footpath Tarmac 108.88 107.31 104.19 Stay 112.05 110.84

110.03 Port Glasgow Port MH CL 111.37 115.88 110.95 109.78 110.40

110.69

104.22 Road

108.61 BS Gravel 116.5

108.82 Stone Wall 1.5m Wall Stone 113.23 104.07

110.98 111.52 Stone 112.5 Wall 2.0m 112.06

110.12 Stone Retaining Wall 111.11 118.11

ASHP J/Box 111.02 103.77 116.97 103.91 112.11 111.48

115.91 103.92 113.0 ER Stone Wall 2.0m 113.04 117.5

ASHP 118.0 Grass 112.18 118.25 104.00 LP 117.77 112.95 112.46 103.57 103.87 SC

116.70

113.5 117.76 118.0 Pasture

ASHP 103.84 103.46 SC 103.78 103.71 103.63 117.93 117.01 GV 103.66 103.65 103.30 118.08 BT Pasture 114.91 113.92 103.75 117.89 103.24 103.41

103.17 2.2m Wall Stone ASHP 117.0 117.34 103.58 103.37 103.38 ASHP 116.80 103.73 117.33 103.34 MP 117.64

ASHP

115.0

ASHP 103.54 113.02 103.12 LP 103.36 G 117.75

103.69 116.0 117.72 103.28 BS 113.42 Overhead Power Line 117.31

ASHP 103.14

116.5

ASHP ASHP J/Box 117.40 103.52 117.77 114.74

103.32 115.5 103.73

Post & Wire 1.1m

103.31 117.5

Stone Wall 1.5m Wall Stone Stone Wall 0.6m

* 117.70

ASHP 116.52 117.5 113.5

103.56 103.24 Hedge 1.5m Hedge

113.93 114.0

117.45 117.5 116.81 117.28 103.78

RE 112.04 ASHP 103.59 103.42 112.65 103.50 Pasture

114.5 103.39 CTV 117.38

103.62

117.0

117.19 * 112.68 103.88 103.55 103.58 114.20 103.66 117.36 116.70 103.72 Pasture CTV Pasture 117.07

103.72

116.95

ASHP

114.28 Stone Wall 1.4m Wall Stone ASHP

117.25 Stone Wall 2.2m Wall Stone Stone Wall 0.4m 115.60 104.03 BT

103.75 ASHP 117.12 114.99 103.87 103.84

ASHP 103.87 117.46 117.99 111.70 114.5 117.10

ASHP 114.88 LP CTV 117.08 MH CL 103.93 Pasture BT 112.16

104.06 ASHP

113.0 Stone Wall 0.4m ASHP V SC 117.0

104.33 113.19 Wire 0.8m Wire V

ASHP

Post & Post

ASHP ASHP 116.14 116.98

V ASHP

104.27 ASHP 104.20 104.19 117.47 104.18

V 111.75 Stone Wall 1.0m Wall Stone Route of Drainage Pipeline 116.98 104.50 104.32 114.53 114.0 112.5 117.06 Pasture

117.69 ASHP 117.09

111.43 ASHP

104.34

116.48 Stone Wall 1.4m Wall Stone 104.42

115.10

117.29 117.5 117.0 07862

V 115.0 116.0 116.90 104.64

CTV 116.96 116.85 V 07863

116.5 07861 104.55 116.60 116.54 113.33 IC 112.0 07860 Pasture 115.5 104.50 104.54

SC 114.5 104.73

104.69 116.5 GB2 110.75 GV

111.66 ASHP 07859

104.65 GB8 ASHP EP

111.5 112.55 110.70

104.53 116.0 116.07 FH 104.60 104.65 104.87 MP 116.08 115.5 117.0

CTV ASHP

104.45 113.5 116.78

114.86 ASHP 104.55 111.0 ASHP 113.86 104.78 116.61 113.64 117.04 BT 112.96 104.36 V 104.38

104.70 114.94

LP 115.0 117.67 115.88 114.95

114.0 V SC 104.32 104.51 104.21 109.57 114.41 104.33 V 114.5

ASHP

110.5 ASHP 104.45 104.10

ASHP CTV 104.17 115.83

ASHP 113.52

ASHP 114.0 ASHP

115.88 Stone Wall 1.4m Wall Stone

ASHP 103.94 110.19 103.91 111.26

110.0 115.71

113.0 Wire 1.0m Wire 108.77

103.92 Post & Wire 0.8m Post & Post 113.83 Pasture

113.62 ASHP 103.76 P 113.55

114.65 ASHP 103.88

113.5 ASHP 103.79 109.37

104.08 ASHP 111.62 113.0

ASHP Pasture 113.26 115.0 117.5

113.67 ASHP

116.68 ASHP 07864 103.68

ASHP

103.56 Stone Wall 1.3m Wall Stone 115.36 117.0

Stone Wall 0.4m 103.55 112.5 116.5 CTV 112.66 114.5

103.57 115.5 115.45 103.72 103.40 SC 103.52 103.54

113.78 Stone Wall 0.6m 103.38 113.17 103.67 103.38 113.17 118.14 Pasture Shelter 110.18 108.15 LP

BT Bus 108.54 113.78 103.43 BS 103.68 112.5 114.0 109.20 112.45

103.24 112.0 103.29 113.44

112.74 113.5 GV 103.55 112.14

116.05 113.5 113.12

ASHP

103.23

ASHP Stone Wall 1.2m Wall Stone 103.11 110.93 112.34 103.27 112.09 GV 07855

SC Route of Drainage Pipeline Drainage of Route

ASHP 111.5

103.41 ASHP GV 103.08 113.0 07857 07856 07858

114.34 SC 112.5 112.0 1.2m Hedge 114.0 V 07854 102.66 113.09 107.67

SC ASHP Pasture 103.25 114.19

112.25

V Stone Wall 1.0m Wall Stone Dead

ASHP 102.66 109.15 102.76 102.85 107.80

ASHP 112.93 112.14 102.68

102.92 112.0 07853 111.61

07852 111.0 111.64 108.22 102.61 Stone Wall 102.67 102.90 0.3m 111.32

113.77 109.5 BT

Pasture ASHP 102.40 111.56 102.85 112.95 110.52 07851 LP

GV ASHP 106.87 ER 113.5 111.24 111.5 111.66 106.90 SC 102.29 Pasture 102.21 106.76 102.38 111.31

Pasture

Port Glasgow Port 113.32 Tarmac Footpath Tarmac 110.5 Hedge 1.2m Hedge 111.98 102.51 111.12

106.86

Road 112.12

Tarmac Footpath Footpath Tarmac Tarmac & Wire 1.1m Wire &

107.61

Concrete Post Concrete Stone Wall 1.6m Wall Stone 108.80 113.49 113.0 111.0 101.69 109.0

107.5 108.0 108.5 110.30 113.0

110.0 Stone Wall 1.3m Wall Stone 107.0 V Pasture

101.61 106.5 112.5 101.56 101.34 ASHP 110.96 110.48 101.67

Stone Wall V 101.17 101.83 CTV 0.3m 101.31 BS 110.11 PW1.2

101.29 112.5 108.63 112.41 Post & 110.33 109.16 109.64 101.18 MH CL G LP Wire 1.1m 110.13 105.62 ER 105.49 110.74 GB1 101.10 111.18 101.16 111.64 106.85 FH

110.65 110.30 107.92

RS 101.57 1.2m Hedge RS

112.0 G 101.00 SC Post & Wire 1.1m 101.15 101.09 110.81 110.54 100.98 ER

IC TP 100.99

G 111.60 111.22 110.5 110.45 G 110.56

111.5 110.53

LP Post & Wire 1.1m CTV Overhead Telecomms. Line Telecomms. Overhead

110.67

Stone Wall 1.6m 1.1m Wire & 100.85 101.42 Post Concrete 100.82

Tarmac Footpath 102.02 CTV TP 101.98 MH CL 110.61 BT 101.31

111.0 LP GV 110.66 102.17

100.89 J/Box 101.26

101.44 110.63 Quarry Drive

Stone Wall Stone 110.58 107.85 0.5m Wateryetts Overhead Telecomms. Line Rough 102.22 Grass 110.70 100.68 CTV 101.30 111.04 100.60 108.61 100.84

102.17 Drive 110.5 1.1m Wooden 110.68 101.92

102.50 Tarmac Footpath 100.72 101.75

101.48 Tarmac Footpath 110.85 101.08 100.56 G 102.02 110.35 109.68 110.83 101.88 107.31 101.85

Stone Wall 1.2m SC SC 100.67 110.86 102.16 114.08

110.85 Wall 1.2m Wall Stone Wall 1.7m 102.90 100.42

Brick Wall 1.0m 110.92 Stone 113.97 102.38

108.06 110.0 Tarmac Footpath

101.87 109.99 100.31 103.13 1.8m Wooden GV Hedge 2.0m 102.31 100.51 111.43 113.52 SC 102.01 102.41 Rough 103.31 Grass 100.44 07865

100.85

102.80 LP Footpath Tarmac 106.82 114.02 Rough 100.35 Grass 109.97 102.81 LP 111.66 111.17 103.04 111.24 MH CL 07874 100.24 100.71 102.49 109.69 SC

103.00 Wooden 1.0m BT 103.21 111.87 GB1A 113.33

Dr 109.5 112.69 103.09 103.90 113.45 07868 TP IC CL 07870 LP 113.39 112.47 111.48

109.39 102.88 FH 100.05

07871 07869 CTV 114.24

111.47 Drive 109.52

103.66

MH CL 103.01 LP Springwood LP 1.1m Wooden 100.32 SC 111.55 112.72 107.84 GV 109.43

111.61 103.19

104.28 112.61 Footpath Tarmac 106.34 07867 111.79 SC 109.34

105.10 109.0

100.21 GB20 Wall 1.2m Wall KO 112.63 113.60 103.39 103.79 BT 104.45 112.12

107.83

103.71 106.5 112.29 Stone Rough BT Grass 112.04 G 103.80 106.0

112.63 105.02

105.5 111.71 104.65 106.92

Wooden 1.4m Wooden 07873 107.5 108.5

SC 07872

106.89 RS

104.15 SC 105.11 106.52 108.76 99.86 SC 104.86 MH CL 104.09 108.51 112.33 SV

112.86 SC

107.33 111.80 CTV 107.06 1.1m Wooden 106.77 G 112.30 104.18 CTV Stp CTV

103.89

IC CL 111.62 106.64 105.51 BS 111.88

104.46 RS 112.22

Wateryetts 106.32 108.0

SV LP

106.44 106.07 Tarmac Footpath Tarmac SV 111.37 107.18 LP 112.10 106.22 107.66 CTV 111.94 MH CL Bin

Drive CTV 105.37 106.05 111.67 108.17 111.16 111.81 112.03 104.82 Rough

106.01 107.04 Grass 07866 Tarmac Footpath104.49 Tarmac Footpath 107.53 107.80

112.79

110.97 106.11 SC MH CL 104.75 112.41 112.51 105.92 Rough

Grass Drive 107.35

107.45 Springwood 2E 107.38

G 104.81

111.63 111.31 RS

104.70 105.60 105.05 107.94 MH CL 1.1m Wooden LP 105.75 105.27 105.77

107.72 IC CL 105.77 Stp

CTV FH 104.84 111.02 Footpath Tarmac 107.48 G 112.28 105.25 112.64 105.48 112.67 111.07 105.23 105.61 111.05 112.46 110.37 IC CL 111.86 105.72 G BT 105.41

105.63 105.05 106.0 KO 107.60 110.47 112.79 KO 107.75 IC CL 112.82 ER KO 111.38 107.68 107.70 IC CL 105.59 107.60 LP IC CL LP KO 105.72 LP 109.96 110.23 KO Tarmac Footpath 111.13 113.43 SC 110.29 CTV RS 105.65 109.88 107.92 107.73 105.61

KO 106.5 110.31 SC

105.87 Tarmac Footpath 113.25 RS 107.81 110.63 107.81 105.85 113.30 CTV MH CL 109.60 107.32 105.89 110.39 Rough IC CL 113.34 Grass 109.70

109.79 107.0 109.74 LP

SC 108.04 CTV 109.52 108.0 IC CL 113.45 Quarry Drive SC 108.04

Stp

106.03 107.5 CTV 108.12 106.36

LP 106.93 109.45 SC IC CL

SC 109.66 RS 108.09 SC 106.27 109.84 109.49 MH CL 109.53 109.64

106.30

KO 109.36 109.49 113.80 MH CL 106.42 114.01 108.63 106.28 106.88 SC 109.71 108.19 SC 113.90 108.20 SC 109.41 CTV 107.97 KO 109.70 J/Box 106.84 113.97

106.29 106.42

Tarmac Footpath Tarmac 109.66

106.87 107.78 108.26 109.53 106.83 G

108.13 G 113.90

Tarmac Footpath Tarmac 108.54

107.93 106.44 114.08 107.43

Avenue KO LP 107.19 109.54 BT IC CL

109.87 109.59 109.57

107.58 CTV 108.50

Hillside 106.52 108.50

110.08 Drive 109.60 G 106.79 BT Springwood G LP 106.91 107.00 SC IC CL 106.66 106.64 Tarmac Footpath CTV

106.64 108.43 CTV

SC CTV

108.17

110.17 Footpath Tarmac Tarmac Footpath Tarmac 106.69 107.38 109.96 109.83 107.25 109.62 108.01 106.71 110.17 LP 107.80 109.94 109.88 108.80 106.72 LP SC SC 106.87 109.39 109.38 J/Box 110.05 SC 106.87 SC 107.26 ER 109.43 110.14 J/Box 109.76 SC 107.01 110.28 SC 107.07 110.13 110.02 J/Box 110.45 BT FH 107.05 109.57 110.32 107.14 110.40 CTV IC CL 110.24 IC 107.07 CTV Tarmac Footpath SC SC 107.28 110.79 SC 110.45 110.92 110.22 111.69 111.18 LP LP CTV 111.03 2D 111.53 IC CL 111.42 111.42 112.27 111.55 KO G 111.24 112.53 111.83 111.53 112.04

Brick Wall 1.0m SC 112.42 SC 111.98 112.45 SC

Tarmac Footpath113.35 112.48 CTV Wateryetts 112.49 112.93 CTV Drive Tarmac Footpath 113.66 Quarry Road, Kilmacolm

Outline Drainage Strategy

Appendix E

Overland Flow Drawings

125856/GL/S/R02, September 2020 235600E 235350E 235400E 235450E 235500E 235550E 235250E 235300E

125.95

Stone 125.04 118.14 124.77 Wall 1.0m 125.04 124.91

IC CL 125.96 124.61 TP 124.57 Overhead 124.56 Gravel Telecomms. Line 124.17 125.06 116.05 124.09 124.26 124.46 117.5 Pasture 123.79 117.67 117.0 Stone Wall 0.6m 116.68 116.5 115.45 115.5 Stone

Stone Wall 1.0m Tarmac Road Wall 1.0m 07864 115.36 122.93 122.94 123.09 123.11 Post & Wire 0.8m 114.34 122.88 115.83 123.22 EP 115.71 114.0 GB7 117.47 116.78 123.26 115.88 113.44 122.22 113.5 123.0 115.0

ASHP 121.93 121.78 Pasture

Stay 121.55 ASHP 122.99 121.84 117.25 117.04 114.5 117.0 TP 122.5 113.78 121.37 121.60 IC 121.35 116.61 112.93 117.09 121.31 121.14 122.37 ASHP 114.65

EP ASHP Pasture 121.03 121.28 Pasture 121.02 120.48 116.96 120.89 120.5 122.0 117.70 116.90 112.5 120.80 121.90 120.44 Hedge 1.5m Hedge 1.2m

120.83 ASHP

120.73 120.36 ASHP 121.5 117.12 Pasture 120.0 117.75

119.96 115.88

ASHP ASHP

120.69 113.0 121.43 117.5 117.36 117.10 Stone Wall 1.0m Tarmac Road 120.09 Overhead Power Line 117.38 116.85 119.51 111.98 120.08 114.24 117.28 114.02 119.69 121.0 112.0 Pasture ASHP

120.70 117.93 ASHP

1.0m 119.5 113.97 119.66 Stone Wall Overhead Power Line 117.19 117.08 119.42 119.55 119.62

119.51 119.78 ASHP 113.78 120.41 ASHP

Gorse 118.99 120.5 Post & Wire 1.1m 117.31 ASHP Bushes 111.64 114.08 119.79 116.5 119.48 Pasture Stone Wall 0.6m ASHP 119.99 Pasture 113.60 119.61 119.36 118.11 119.00 114.95 Tarmac Footpath 113.39 118.64 119.0 116.54 Tarmac Footpath

Overhead Telecomms. Line 119.37 119.43 119.17 120.0 117.34 117.0 116.98 Springwood ASHP 113.45 114.94 118.81 119.10 118.67 Route of Drainage Pipeline 118.82 113.33 117.33 ASHP Drive 116.60 ASHP 113.52 118.64 117.99 118.0 116.98 118.87 118.26 ASHP 116.95 116.0 118.46 Stone Wall 1.0m 118.5 118.94 Gorse 119.5 118.65 118.0 ASHP 118.40 116.81 120.71 118.36 119.42 112.86 Pasture 111.66 LP 118.26 119.5 117.07 115.5 112.63 117.94 118.64 117.85 119.0 112.72 RS

120.92 117.77 118.65 118.18 117.0 113.12 CTV 117.78 112.79 117.54 117.84 Impenetrable 117.76 117.65 ASHP 112.61 118.06 Gorse Bushes 118.5 111.31 112.63 118.44 RS 117.48 117.75 113.67 CTV 112.82 ASHP 111.56 G 112.69 G 112.64 118.36 ASHP 120.54 114.41 112.29 112.33 116.98 117.23 117.64 120.11 118.0 MH CL 116.52 117.06 113.62 112.47 112.67 117.21 112.51 117.5 117.75 117.40 112.12 112.30 Soil 120.0 ASHP CTV 118.0 EP 119.74 116.93 Concrete Post SV TP 117.5 & Wire 1.1m SV

118.87 G 117.5 SV 119.56 117.0 111.87

117.54 114.0 112.41 Stay ASHP 116.91 GB6 118.21 GB20 112.79 112.22 116.59 117.17 Hedge 1.2m 111.66 111.79 Stay 113.5 117.26 FH 112.10 112.46 116.52 111.5 116.84 V 111.43 119.66 V 111.47

ASHP SC 119.79 118.10 116.48 Pasture 112.03 118.92 V ASHP 112.28 ASHP 118.08

117.14 115.0 119.0 V 111.61 ASHP 111.55 MH CL 116.5 111.71 111.94 117.5 116.29 116.68 118.5 111.04 111.48 111.88 111.86 Post & Wire 1.1mStone Wall 0.6m 119.10 ASHP 111.12 116.88 MH CL 111.81 LP ASHP 111.24 111.63

Pasture 114.5 116.67 116.41 110.96 Tarmac Footpath 118.25 Tarmac Footpath LP 112.04 111.67 Springwood 116.53 117.32 117.27 ASHP 110.85 RS Tarmac Footpath 117.62 116.00 115.86 116.5 117.99 117.29 111.0 111.61 117.65 117.97 113.52 Pasture 110.92 116.28 Impenetrable Pasture 117.77 112.5 110.65 Drive Gorse Bushes 116.29 112.09 110.58 110.83 Wooden 1.0m 111.80 116.93 111.17 IC CL 117.27 115.96 Pasture 116.31 118.0 Quarry Drive 116.45 ASHP 116.50 Route of Drainage Pipeline MH CL Tarmac Footpath 111.62

117.91 115.65 111.31 117.0 112.14 G 110.61 SC 116.42 110.33 116.52 115.65 117.0 110.54 Brick Wall 1.0m SC 111.05 117.89 ASHP

P 116.0 117.5 111.24

117.90 116.02 FH 110.86 * PW1.2 110.45 111.37 116.11 ASHP LP 111.07

113.0 CTV Soil 117.69 111.32 G CTV 111.02 115.64 110.30 110.70 117.30 111.16

117.17 07860

ASHP

115.5 112.0 * IC ASHP 07861 CTV 117.5 116.08 115.67 115.51 117.46 110.56 110.97 P 115.61 115.35 116.15 07859 112.66 116.0 V 07862 116.97 110.11 IC CL 116.31 112.34 110.47 Soil V 115.52 115.50 Overhead Power Line 116.5 V 07863 110.53 Soil 116.31 117.45 Hedge 1.2m 115.04 117.0 Concrete Post 115.0 V & Wire 1.1m 114.69 ASHP V V 116.32 116.5 116.07 110.48 110.5 IC CL 115.17 114.95 117.64 112.14 110.37 ASHP P ASHP Pasture Bushes 116.48 116.0 116.70 112.74

ASHP 114.5 110.63 114.66 GB8 114.75 Impenetrable 115.29 114.42 114.36 Stone Wall 115.76V 116.0 110.68 Soil Gorse Bushes 0.3m Wooden 1.1m EP 116.14 110.67 115.22 113.83

ASHP 114.79 V 112.95 114.52 ASHP 07853 07855 110.81 110.66 114.39 115.5 07854 Post & Wire 1.0m 114.15 114.19 110.35 109.97 IC CL ASHP

117.5 114.22 07856 112.5

114.11 ASHP 114.86 113.0 109.69 115.5 113.17 07857 114.19 117.01 Pasture 115.88 07852 113.32 116.70 113.5 Stone Wall 114.18 115.0 117.72 0.3m Bushes Pasture

114.07 113.17 07851 113.49 111.22 Hedge 2.0m ASHP 114.82 114.0 113.55 109.52

115.10 Stone Wall 0.4m 07858 110.5 Rough 113.92 114.0 113.97 ASHP

ASHP Dead 113.26 113.77 Grass TP 113.43 ASHP Post & Wire 1.1m

109.43 111.0 114.0 113.82 ASHP 109.99

113.09 110.0 114.24 Wooden 1.1m

113.5 111.5 113.81 115.0 117.0 Pasture 112.41 112.0 109.34 113.0 112.5

111.60 07865

113.32 ASHP 113.86

ASHP 114.5 V 113.0 Stone Wall 0.6m Rough Wooden 1.0m 112.88 113.69 114.45 116.80 116.52 113.64 Grass 112.84 115.91 115.60

ASHP Post & Wire 1.1m 109.39 112.45 113.5 116.5 V 112.5 113.5 108.76 112.77 113.38 113.0 113.38 Pasture 114.53 111.64 Pasture Wooden 1.1m 107.28 114.5 112.25 110.85 112.34 MH CL 112.0 112.34 116.0 113.35 ASHP 112.17 Stone Wall 0.4m CTV 114.0 113.72 109.0 107.20

Wooden 1.0m 114.99 ASHP 112.12 112.65 112.12 108.17 ASHP 115.5 114.88 112.96 111.18 109.5 108.51 107.01 114.0 112.23 112.5 112.29 ASHP

ASHP Overhead Telecomms. Line 107.04 111.5 112.03 112.03 111.62

106.80 ASHP 112.41 115.0 114.91 114.5 106.98 112.03 112.17 113.33 108.5 107.94 113.38 107.10 114.74 Pasture Rough Garage 113.23 Grass 112.49 111.0 110.74 106.65 112.58 114.5 Wooden 1.1m 110.93 106.49 112.55 Wooden 1.0m 113.04 113.5 109.68 107.80 112.43 113.0 106.92 114.20 TP 108.0 111.58 Stone Wall 0.4m Tarmac Road 07866 112.49 114.0 110.52 106.28 114.28 110.5 110.13 107.08 106.55 113.93 Stp 111.68 106.73 112.5 113.92 111.26 110.30 112.41 112.95 107.75 105.87 Stone Wall 1.1m 112.16 107.72 111.99 Stone Wall 2.2m 113.19 Tarmac Road 112.05 113.5 110.0 BT 106.91 111.96 112.05 Rough 107.66 Stone Wall 1.2m 112.16 105.65 112.06 112.18 113.0 109.64 Grass Bin 112.11 113.42 105.86 111.70 ASHP 07867 107.48 110.18 V KO 106.05 111.60 111.52 112.46 113.02 V 107.53 107.38 107.60 111.60 MH CL Grass ASHP 105.14 LP 107.45 110.84 111.37 112.65 Pasture 106.17 110.95 110.98 112.5 111.66 109.5 105.15 107.35 Chainlink 1.4m 110.84 110.84 112.68 107.83 BS 104.93 112.0 109.16 105.13 Tarmac Footpath 110.41 110.69 Stone Retaining Wall 109.15 107.18

GB4 112.04 Post & Wire 1.1m 108.61 Port Glasgow 110.40 Stone Wall 2.0m Overhead Telecomms. Line 111.5 107.33 105.35 110.05 Stone Wall 2.2m V V 110.30 107.5 111.11 109.0 LP 104.52 111.48 107.04 Road 111.0 107.84 105.45 104.52 110.5 108.80 107.06 110.03 110.19 Gravel 112.16 ASHP

104.35 111.02 106.89 109.78 104.56 104.26 109.09 Stone Wall 1.4m Post & 106.77 Wire 0.8m 108.63 104.76 SC 110.12 108.5 106.64 SC 111.70 110.0 104.15 111.75 108.96 108.85 109.20 104.15 106.44 104.95 Stone 108.06 Gravel 111.43 07868 104.04 Rough Wall 2.0m Stone Wall 1.0m Chainlink 1.4m 108.88 07869 103.97 104.04 106.52 Grass TP 106.22 BT 103.93 108.82 104.14 108.46 106.32 103.93 07870 110.70 108.0 106.01 104.35 103.79 107.75 103.89 107.44 108.61 106.92 Stone Wall 1.4m 108.22 107.92 106.11 103.76 Tarmac Road 106.0 103.72 110.75 106.05 104.50 104.24 107.85 LP 107.26 103.71 107.40 109.57 106.07 IC CL G 07871 ASHP 105.92 105.77 G 107.61 103.92 103.64 103.65 105.77 KO 107.24 104.08 LP 104.06 104.08 107.31 KO

ASHP 2E Gravel 106.38 Post & 107.5 Wooden 1.8m 105.63 103.83 104.08 Wire 1.0m 106.5 103.94 106.22 Rough GV IC CL 107.31 105.75 BT LP 109.37 105.51 104.18 103.86 104.14 106.37 Grass Wooden 103.90 104.30 106.34 103.90 IC IC CL 105.72 1.2m Stone Wall 1.4m 106.007872 SC 103.94 104.05 IC 106.00 105.95 Tarmac Footpath Tarmac Footpath Gravel 108.77 Pasture 106.82 Stp 106.10 105.61 103.91 104.15 07873 Wooden MH CL Stone Wall 1.3m 105.73 105.78 106.85 1.2m 104.00 104.65 106.05 Stone Wall 1.5m FH 104.23 108.54 07874 105.5 CTV 107.0 106.07 105.60 105.48 104.19 105.07 105.11 BT 104.48 SC Wooden 1.4m 105.41 104.23 105.03 108.15 G 105.23 105.27 104.34 104.74 105.10 CTV 105.44 104.61 Post & 104.38 105.04 105.37 105.23 MH CL Wire 1.1m 107.80 ER 104.65 104.68 104.84 105.02 G 104.49 104.52 104.77 105.25 104.67 107.67 Tarmac Footpath MH CL 104.57 104.64 CTV 105.05 104.64 104.66 106.5 MH CL 104.42 106.90 MH CL 104.59 104.39 104.86 104.70 104.55 104.82 CTV 106.86 104.30 106.87 Tarmac Footpath 104.81 104.47 104.45 104.23 104.65 104.22 106.76 104.69 CTV 104.75 GB3 FH 105.05 Stone Wall 1.3m SC CTV SC 104.65 LP Stone Wall 1.5m 104.35 104.45 104.05 BS 105.62 SC 104.46 104.27 104.19 104.28 104.84 105.49 Drive104.49 104.51 Port GlasgowJ/Box 104.00 Wateryetts 104.15 ER 104.70 104.42 104.13 LP 104.18 Road 103.77 LP Tarmac Footpath 103.78 103.92 SC IC CL 104.30 Tarmac Footpath 103.90 KO 104.09 SC 103.65 103.79 Dr 103.57 103.91 GV KO 103.80 103.46 BT 103.41 103.37 MH CL 103.71 IC CL 103.63 103.66 103.89 104.07 103.34 CTV 103.30 103.31 SC 103.24 MP 103.71 103.21 BT 103.17 103.28 103.13 SC 103.66 103.38 103.31 103.04 103.87 G J/Box Stone Wall 1.5m 103.12 103.09 103.42 103.39 103.84 103.36 102.90 103.58 103.14 103.00 RE 103.55 FH 103.32 CTV 103.66 102.80 103.24 103.72 103.19 103.75 103.54 Stone Wall 1.4m 102.81 103.39 CTV 103.87 BT 104.06 LP 103.52 103.58 103.01 103.73 CTV SC 104.27 BS 103.50 104.32 Stone Wall 1.7m BT 102.88 103.75 BT 102.50 103.56 BT Stone Wall 1.4m 103.69 103.59 104.73 102.38 103.84 MH CL 103.93 IC 103.62 104.20 104.87 102.41 103.73 GV LP 103.72 104.42 SC 104.78 102.31 104.18 104.70 102.22 104.55 MP CTV 102.49 103.78 103.87 LP 104.51 104.54 104.45 CTV 104.65 BT 102.16 103.88 104.65 102.17 LP 104.19 SC Stone Wall 1.4m 104.03 104.34 104.55 CTV 102.17 104.50 104.32 104.08 104.33 102.02 GB2 104.53 104.33104.17 P 104.50 101.98 104.45 CTV 103.72 104.64 101.92 FH 104.38 103.92 103.67 102.02 104.69 103.79 LP103.68 101.85 104.21 103.88 SC 104.60 103.68 103.55 101.88 102.01 BT

Tarmac Footpath Quarry Road, Kilmacolm

Outline Drainage Strategy

Appendix F

Existing Drainage Catchment Area & Greenfield Runoff Rate Calculations

125856/GL/S/R02, September 2020 235700E 235450E 235500E 235550E 235600E 235650E 235400E

118.14

116.05

117.5 Pasture 117.67 117.0 Stone Wall 0.6m 116.68 116.5 115.45 115.5 07864 115.36

Post & Wire 0.8m 114.34

115.83 EP 115.71 114.0 117.47 116.78 115.88 113.44 113.5

115.0

117.25 117.04 114.5 117.0 113.78 116.61 112.93 117.09 114.65

Pasture Pasture 116.96 116.90 117.70 112.5

Hedge 1.5m Hedge 1.2m

Pasture 117.75 117.12 115.88

117.5 117.36 117.10 113.0 117.38 116.85 111.98 114.24 114.02 117.28 112.0 117.93

Overhead Power Line 117.19 117.08 113.97 113.78 117.31 Post & Wire 1.1m 111.64 114.08 Pasture Stone Wall 0.6m Pasture 116.5 113.60 118.11 114.01 114.95 Tarmac Footpath 113.39 Tarmac Footpath 116.54 113.90 117.34 117.0 116.98 Springwood 113.45 SC Route of Drainage Pipeline 114.94 113.97 118.82 113.33 117.33 116.60 Drive 118.0 116.98 113.52 113.43 113.90 116.95 116.0

118.40 116.81 Tarmac Footpath LP 112.86 117.07 111.66 113.30 Quarry DriveCTV 115.5 112.63 SC LP 114.08

117.77 112.72 RS 113.34 118.18 117.0 113.12 CTV 112.79 SC 117.76 113.25 113.80 112.61 111.31 112.63 RS CTV 113.67 111.56 112.82 112.69 G 112.64 G 112.33 113.45 114.41 112.29 113.62 112.47 MH CL 112.67 117.06 112.51 117.40 112.12 112.30 Tarmac Footpath CTV EP Concrete Post SV

& Wire 1.1m SV G 117.5 SV 117.54 111.87 112.41 118.21 Stay 114.0 GB20 112.79 112.22 Hedge 1.2m 111.66 111.79 Stay 113.5 FH 112.10 112.46 111.5 111.43 111.47 SC 112.03 118.08 Pasture 112.28 115.0 111.61 111.55 MH CL 111.71 111.94 111.04 111.48 111.88 111.86 Post & Wire 1.1mStone Wall 0.6m 111.12 MH CL 111.81 LP 111.24 111.63

Pasture 114.5 110.96 Tarmac Footpath 118.25 Tarmac Footpath LP 112.04 111.67 Springwood 117.27 110.85 RS Tarmac Footpath 117.99 111.61 117.97 117.29 113.52 Pasture 111.0 110.92 117.77 112.5 110.65 Drive 112.09 110.58 110.83 Wooden 1.0m 111.80 111.38 116.93 118.0 Quarry Drive 111.17 Route of Drainage Pipeline MH CL Tarmac Footpath 111.62 112.14 111.31 G 110.61 SC 111.13 110.33 111.05 117.0 117.89 110.54 Brick Wall 1.0m SC 117.5 111.24 CTV PW1.2 FH 110.45 110.86 111.37 LP 111.07

113.0 CTV 117.69 111.32 G CTV 111.02 110.30 110.70 07860 111.16

112.0 IC 07861 CTV 110.63 117.5 116.08 117.46 07859 110.56 110.97 07862 112.66 116.97 110.11 IC CL SC 116.31 110.47 112.34 IC CL KO 110.39 116.5 110.29 07863 110.53 Hedge 1.2m KO 117.45 117.0 Concrete Post 110.23 110.31 & Wire 1.1m 116.5 116.07 110.48 110.5 IC CL 117.64 112.14 110.37 LP 116.48 Pasture 116.0 116.70 112.74 110.63 CTV GB8 109.84 Stone Wall 115.76 116.0 110.68 109.74 0.3m Wooden 1.1m 116.14 110.67 113.83 112.95 109.96 109.79 SC 109.70 07853 109.71 07855 110.81 110.66 109.88 115.5 109.70 07854 110.35 109.97 CTV

117.5 07856 112.5

109.66 114.86 113.0 109.69 115.5 113.17 07857 114.19 117.01 109.49 Pasture 113.32 115.88 07852 Stone Wall 116.70 113.5 109.45 115.0 117.72 0.3m 109.53 IC CL 113.17 07851 113.49 111.22 Hedge 2.0m 109.54 109.60 KO CTV 114.0 MH CL 113.55 109.52 109.41

115.10 Stone Wall 0.4m 07858 110.5 Rough 109.49 LP Dead IC CL 113.26 113.77 Grass TP 109.52 KO Post & Wire 1.1m 109.36 109.43 111.0 CTV 114.0 109.99 113.09 110.0 Wooden 1.1m

115.0 113.5 111.5 112.0 113.66 117.0 Pasture 112.41 109.34 109.62 113.0 112.5 SC 113.51

111.60 07865 109.57 CTV 113.86 SC 109.53 113.57 114.5 113.35 113.0 109.66 Tarmac Footpath Rough SC 109.60 Springwood 114.45 116.80 113.64 Grass 115.91 116.52 109.59 115.60 109.64 Tarmac Footpath 109.39 112.45 Drive Tarmac Footpath 116.5 112.5 Brick Wall 1.0m 112.53 SC 113.5 108.76 WateryettsDrive 112.42 110.02 112.27 114.53 112.48 111.64 109.88 Tarmac Footpath Wooden 1.1m J/Box Pasture 113.08 114.5 112.25 110.85 109.94 112.45 112.0 112.93 116.0 110.24 112.04 109.83 111.69 CTV 113.05 Stone Wall 0.4m FH LP 109.87 110.05 110.79 114.0 KO 113.72 109.0 112.49 111.42 111.83 SC 114.99 112.12 108.17 115.5 110.08 110.28 IC CL SC

109.5 111.53 111.55 114.88 112.96 111.18 108.51 110.92 114.0 LP G 111.98 CTV 110.32 111.42 111.18 Overhead Telecomms. Line 111.5 110.14 111.03 111.62 110.17 111.53 SC 115.0 110.45 114.91 114.5 SC 113.33 108.5 107.94 113.38 110.17 110.13 SC 111.24 114.74 Pasture Rough 110.45 IC CL 113.23 Grass 109.96 110.40 2D 111.0 110.74 109.76 CTV 114.5 Wooden 1.1m 110.93 112.55 CTV LP 113.04 113.5 109.68 107.80 113.0 114.20 TP 108.0 109.39 Stone Wall 0.4m 109.43 Tarmac Footpath110.22 114.0 110.52 07866 CTV 114.28 110.5 110.13 Stp Tarmac Footpath109.38 113.93 LP 112.5 110.30 SC 113.92 111.26 107.75 107.92 112.41 112.95 108.63 SC Stone Wall 1.1m 112.16 107.72 108.12 109.57 Stone Wall 2.2m IC CL SC 113.19 107.70 G Tarmac Road 112.05 113.5 110.0 BT 108.50 J/Box 112.05 107.66 LP SC 112.16 Rough KO 107.81 ER Stone Wall 1.2m 112.06 112.18 107.60 108.54 109.64 Grass Bin J/Box 112.11 113.0 108.04 113.42 107.73 108.19 G 111.70 07867 107.48 110.18 KO 108.50 107.81 108.04 111.60 111.52 112.46 113.02 107.53 107.38 107.60 108.26 108.80 111.60 MH CL Grass LP 107.45 110.84 111.37 112.65 Pasture IC CL 109.5 108.09 108.20 108.43 110.95 110.98 112.5 111.66 107.68 107.35 BT 110.84 110.84 112.68 107.83 BS Stp 108.13 112.0 109.16 Rough CTV 110.41 109.15 Grass RS 110.69 Stone Retaining Wall 107.18 108.17

112.04 Post & Wire 1.1m 108.61 110.40 Overhead Telecomms. Line Stone Wall 2.0m 107.93 111.5 107.33 110.05 Stone Wall 2.2m 108.0 107.97 110.30 107.5 111.11 109.0 111.48 107.04 111.0 107.84 110.5 108.80 107.06 108.01 110.03 110.19 112.16 107.78

111.02 106.89 109.78 109.09 Stone Wall 1.4m Post & 106.77 107.80 Wire 0.8m 108.63 107.58 110.12 108.5 106.64 111.70 110.0 111.75 LP 108.85 109.20 MH CL 107.43 108.96 107.32 108.06 106.44 Gravel Stone 111.43 07868 Rough 107.5 107.19 107.0 108.88 Wall 2.0m Stone Wall 1.0m 07869 106.52 Grass TP 106.22 IC CL KO 107.38 108.82 106.5 106.93 106.84 108.46 106.32 110.70 108.0 07870 106.88 KO 106.01 106.87 107.44 107.75 108.61 106.92 Stone Wall 1.4m 108.22 107.92 106.11 IC CL Tarmac Road 110.75 106.05 106.0 107.00 107.85 LP 107.26 107.40 109.57 106.07 IC CL RS 106.27 07871 105.92 105.77 106.91 107.61 105.77 RS 106.03 106.30 KO BT 107.24 107.31 2E KO Post & 107.5 Wooden 1.8m 105.63 SC 106.28 106.79 Wire 1.0m 106.5 SC 107.31 Rough 105.75 105.87 SC 106.37 109.37 Grass 105.51 105.72 106.34 105.89 G MH CL106.42 106.66 106.007872 105.72 105.65 106.42 Gravel 108.77 Pasture 106.82 Stp 106.10 105.61 LP SC 106.69 07873 106.44 MH CL Stone Wall 1.3m 105.59 105.78 106.85 G 106.72 106.05 Stone Wall 1.5m 07874 108.54 105.5 106.29 107.0 105.85 SC 106.36 Tarmac Footpath 106.07 105.60 105.48 106.52 105.11 Hillside 106.87 Wooden 1.4m 105.41 108.15 G J/Box Avenue 105.23 105.27 105.10 Tarmac Footpath 106.64 105.44 SC Post & LP 105.61 105.04 105.37 105.23 107.80 Wire 1.1m 106.71 104.84 105.02 G ER 107.05 104.77 105.25 106.64 107.67 Tarmac Footpath MH CL 104.64 CTV 105.05 104.66 106.5 106.83 BT 104.42 106.90 MH CL 106.87 104.86 104.39 104.82 107.28 CTV 106.86 IC 104.30 106.87 Tarmac Footpath 104.81 CTV 104.45 104.23 104.65 107.01 104.22 106.76 CTV 104.75 107.07 FH 105.05 Stone Wall 1.3m SC CTV SC Stone Wall 1.5m SC 107.14 104.35 104.45 104.05 BS 105.62 SC SC 104.46 107.07 107.25 104.27 104.19 104.28 104.84 105.49 Drive104.49 107.26 Port Glasgow 104.00 Wateryetts

Tarmac Footpath

Existing Greenfield Runoff Rates

The EA/DERFA R&D Technical Report W5-074 ‘Preliminary Rainfall Runoff Management for Developments’ states that for developments which are less than 50 ha in size the Institute of Hydrology Report 124 (IH124) ‘Flood Estimation for Small Catchments’ should be used to calculate the peak greenfield runoff rates.

Where the area being considered is less than 50 ha; Technical Report W5-074 provides the following advice for this scenario.

“Where developments are smaller than 50 ha the analysis for determining the peak greenfield discharge rate should use 50 ha in the formula and linearly interpolate the flow rate value based on the ratio of the development to 50 ha.”

This advice is replicated in The SUDS Manual (CIRIA C753).

As described above, the IH124 method uses the following equation to calculate greenfield runoff:

0.89 1.17 2.17 QBAR, rural = 0.00108 * AREA * SAAR * SOIL

3 Where: QBAR, rural = Mean Annual Flood (m /s) AREA = Catchment Area (km2) SAAR = Standard Average Annual Rainfall (mm) SOIL = Soil Index (from Wallingford Procedure maps)

For the area of Kilmacolm, the SAAR is taken to be 1600 mm and the SOIL value is 0.45. Regional Growth Factors have been obtained from Technical Report W5-074, which have been used to determine peak flows for a range of return periods.

0.89 1.17 2.17 For 50 ha QBAR, rural = 0.00108 * 0.50 * 1600 * 0.45 = 0.577 m3/s = 578 l/s

For 1 ha QBAR, rural = 578/50 = 11.56 l/s/ha

As the surface water is proposed to discharge into an existing watercourse, we propose that this development will limit its discharge to the equivalent 30 year greenfield runoff rate with the inclusion of an additional 30% allowance for climate change and a further 10% for development creep (Sewers for Scotland 3).

Greenfield Runoff Allowable Discharge Event Growth Factor Rate (l/s/ha) Rate (l/s)

Mean Annual Flood 1.00 11.56 12.81

1 in 2 year 0.91 10.52 13.15 1 in 30 year 1.90 21.96 27.45 1 in 100 year 2.63 30.40 38.00 1 in 200 year 2.98 34.45 46.06

Allowable Discharge Rate based on a catchment area of 1.25ha.

Quarry Road, Kilmacolm

Outline Drainage Strategy

Appendix G

Simple Index Approach Tool Results

125856/GL/S/R02, September 2020 SUMMARY TABLE DESIGN CONDITIONS 1 2 3 4

Low traffic roads (e.g. residential roads and general Land Use Type access roads, < 300 traffic movements/day)

Pollution Hazard Level Low Pollution Hazard Indices TSS 0.5 Metals 0.4 Hydrocarbons 0.4 SuDS components proposed

SuDS components can only be assumed to deliver these indices if they follow design guidance with respect to hydraulics Component 1 Detention basin and treatment set out in the relevant technical component chapters of the SuDS Manual. See also checklists in Appendix B

Component 2 None

Component 3 None

SuDS Pollution Mitigation Indices TSS 0.5 Metals 0.5 Hydrocarbons 0.6

Groundwater protection type None

Groundwater protection Pollution Mitigation Indices TSS 0 Metals 0 Hydrocarbons 0

Combined Pollution Mitigation Indices TSS 0.5 Reference to local planning documents should also be made to Metals 0.5 identify any additional protection required for sites due to Hydrocarbons 0.6 habitat conservation (see Chapter 7 The SuDS design process). The implications of developments on or within close proximity to an area with an environmental designation, such as Acceptability of Pollution Mitigation a Site of Special Scientific Interest (SSSI), should be considered via consultation with relevant conservation bodies TSS Sufficient such as Natural England Metals Sufficient Hydrocarbons Sufficient SUMMARY TABLE DESIGN CONDITIONS 1 2 3 4

Land Use Type Residential roofing

Pollution Hazard Level Very low Pollution Hazard Indices TSS 0.2 Metals 0.2 Hydrocarbons 0.05 SuDS components proposed

SuDS components can only be assumed to deliver these indices if they follow design guidance with respect to Pervious pavement (where the pavement is not Component 1 hydraulics and treatment set out in the relevant technical designed as an infiltration component) component chapters of the SuDS Manual. See also checklists in Appendix B

Component 2 None

Component 3 None

SuDS Pollution Mitigation Indices TSS 0.7 Metals 0.6 Hydrocarbons 0.7

Groundwater protection type None

Groundwater protection Pollution Mitigation Indices TSS 0 Metals 0 Hydrocarbons 0

Combined Pollution Mitigation Indices TSS 0.7 Reference to local planning documents should also be made Metals 0.6 to identify any additional protection required for sites due to Hydrocarbons 0.7 habitat conservation (see Chapter 7 The SuDS design process). The implications of developments on or within close proximity to an area with an environmental designation, such Acceptability of Pollution as a Site of Special Scientific Interest (SSSI), should be Mitigation considered via consultation with relevant conservation bodies TSS Sufficient such as Natural England Metals Sufficient Hydrocarbons Sufficient SUMMARY TABLE DESIGN CONDITIONS 1 2 3 4

Land Use Type Residential parking

Pollution Hazard Level Low Pollution Hazard Indices TSS 0.5 Metals 0.4 Hydrocarbons 0.4 SuDS components proposed

Component 2 None

Component 3 None

SuDS Pollution Mitigation Indices TSS 0.7 Metals 0.6 Hydrocarbons 0.7

Groundwater protection type None

Groundwater protection Pollution Mitigation Indices TSS 0 Metals 0 Hydrocarbons 0

Outline Drainage Strategy

Appendix H

Post Development Foul Discharge Calculations

125856/GL/S/R02, September 2020 W A T E R D E M A N D F O U L D I S C H A R G E Domestic Domestic Time leakage domestic Time leakage domestic Only 1.200 Only 00:00 1.09 0.29 0.131 00:00 1.09 0.29 0.105 01:00 1.09 0.20 0.090 01:00 1.09 0.20 0.072 02:00 1.09 0.17 0.077 02:00 1.09 0.17 0.061 1.000 03:00 1.09 0.15 0.068 03:00 1.09 0.15 0.054 04:00 1.09 0.17 0.077 04:00 1.09 0.17 0.061 05:00 1.09 0.34 0.153 05:00 1.09 0.34 0.123 06:00 1.09 1.09 0.4920.800 06:00 1.09 1.09 0.394 07:00 0.96 2.03 0.916 07:00 0.96 2.03 0.733 08:00 0.96 2.27 1.025 08:00 0.96 2.27 0.820 09:00 0.96 1.87 0.844 09:00 0.96 1.87 0.675 10:00 0.96 1.39 0.6270.600 W A T E R D E M A N D 10:00 0.96 1.39 0.502 11:00 0.96 1.31 0.591F O U L D I S C H A R G E 11:00 0.96 1.31 0.473 12:00 0.96 1.45 0.655 12:00 0.96 1.45 0.524 13:00 0.96 1.22 0.551 13:00 0.96 1.22 0.441 14:00 0.96 0.88 0.3970.400 14:00 0.96 0.88 0.318 15:00 0.96 0.88 0.397 15:00 0.96 0.88 0.318 16:00 0.96 1.07 0.483 16:00 0.96 1.07 0.386 17:00 0.96 1.26 0.569 17:00 0.96 1.26 0.455 18:00 0.96 1.35 0.6090.200 18:00 0.96 1.35 0.488 19:00 0.96 1.32 0.596 19:00 0.96 1.32 0.477 20:00 0.96 1.19 0.537 20:00 0.96 1.19 0.430 21:00 0.96 0.95 0.429 21:00 0.96 0.95 0.343 0.000 22:00 0.96 0.69 0.311 22:00 0.96 0.69 0.249 1 3 5 7 9 11 13 15 17 19 21 23 23:00 0.96 0.46 0.208 23:00 0.96 0.46 0.166

W A T E R D E M A N D Note: F O U L D I S C H A R G E The calculations presented on this sheet are the figures which Scottish Water will accept when filling out a Number of Houses 78 Pre-Development Enquiry (PDE)Form for Water Demand and Foul Discharge rates. This spreadsheet was Average Flow 0.451 Average Flow 0.361 Max Flow (Peak) 1.025 Max Flow (Peak) 0.820

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