Flood Risk Assessment At Royal Gunpowder Mills For The Change of Use of the Existing Shop and Reception Building H7 To an Office

Contents

1 Introduction 2 Site Description 3 Sources of Potential Fluvial Flood Risk 4 The Proposal 5 Assessment 6 Conclusion

Appendices

1 Site Location Plan 2 Environment Agency’s Indicative Flood Risk Map 3 Flood Modelling Node Locations and Levels 4 Survey and Flood Lines 5 Layout 6 Extract from the Geological Map 7 Extract from Defra/ EA Report Flood Risk and New Development Phase 2 FD2320/TR2 8 Glossary

1078/09 - FRA - H7 CoU

Michael Thomas Consultancy LLP Limited Liability Partnership Number. 0C 302337 Registered in and in Wales Registered Office 5 King’s Court Willie Snaith Road Newmarket Suffolk CB8 7SG Tel 01638 661226 Fax 01638 669812 Email [email protected] Partners M. F. Thomas P. E. Thomas Associates J. T. Crawley M. Brindley Flood Risk Assessment At Royal Gunpowder Mills Waltham Abbey For The Change of Use of the Existing Shop and Reception Building H7

1 INTRODUCTION

1.1 Michael Thomas Consultancy LLP has been asked to provide a Flood Risk Assessment in respect of the change of use of the existing building H7 from Shop and Reception Area at the entrance to the Royal Gunpowder Mills Waltham Abbey site to an office shop use.

1.2 This report is based on the following information:

1.2.1 Flooding information provided by the Environment Agency.

1.2.2 Site inspection by Michael Thomas Consultancy LLP.

1.2.3 Survey data supplied by client and spot levels taken by Ratcliff Land Survey.

1078/09 - FRA- H7 CoU 1 1.3 All the comments and opinions contained in this report including any conclusions are based on the information available to Michael Thomas Consultancy LLP during our investigations. The conclusions drawn could therefore differ if the information is found to be inaccurate, incomplete or misleading. Michael Thomas Consultancy LLP accept no liability should this prove to the be the case, nor if additional information exists or becomes available with respect to this site.

1.4 Michael Thomas Consultancy LLP makes no representation whatsoever concerning the legal significance of its findings or any other matters referred to in the following report. Except as otherwise requested by the client, Michael Thomas Consultancy LLP are not obliged and disclaim any obligation to update the report for events taking place after the Assessment was undertaken.

1.5 This report is a Flood Risk Assessment of flooding issues associated with the proposed development. The information presented and conclusions drawn are based on statistical data and are for guidance purposes only. This report provides no guarantee against flooding of the study site or elsewhere, nor as to the absolute accuracy of water levels, flow rates and associated probabilities quoted.

1078/09 - FRA- H7 CoU 2 2 SITE DESCRIPTION

2.1 The Museum Site lies to the north of Waltham Abbey on land between the Horsemill Stream / River Lea and the .

2.2 The main access to the site is from the A121 junction with the B194 via Beaulieu Drive northwards to the Hoppit Road junction. To the north of the Hoppit Road, Beaulieu Drive junction is the existing car park and Building H7.

2.3 Building H7 is an existing building surrounded by a blast bank at the entrance to the Royal Gunpowder Mills complex just north of the junction between Beaulieu Drive and Hoppit Road on the western side of The Royal Gunpowder Mills site.

2.4 To the east of Building H7 is the first of the three old canal routes and the central open area of the Museum site and further east is the area known as the east flank being the area on the western bank of the Old River Lea bounded on the west by the Old River Lea and on the east by the Middle Road Canal which is the first of the Mill Head Stream internal canals, associated with the site.

2.5 To the north of Building H7 is the existing visitors car park and to the west is the northern end of Beaulieu Drive and then the Horsemill Stream of the River Lea .

2.6 The existing building is a brick built structure.

2.7 Hoppit Road runs eastwards past the current security building and over the three disused canals to a roundabout at its junction with Powdermill Way.

2.8 Between the canals there is an elevated walkway running south to Flagstaff Road.

1078/09 - FRA- H7 CoU 3 2.9 The road to the east from the roundabout passes the Mineral Jelly Store before reaching the Middle Road Canal.

2.10 The surface water drainage for the existing building H7 discharges to the existing piped surface water drainage system.

1078/09 - FRA- H7 CoU 4 3 SOURCES OF FLOOD RISK

3.1 In accordance with Planning Policy Statement 25 various forms of flood risk need to be considered for any development.

3.2 The first form of flood risk to be considered in respect of any development in accordance with Annex C of Planning Policy Statement 25 is fluvial flooding.

3.3 The fluvial flood risk to this site is relatively complex as the River Lea which is the only source of fluvial flood risk consists of multiple channels through this area. The most eastern stream is known as the Cornmill Stream and through the site forming the eastern boundary of the east flank section is the Old River Lea.

3.4 The western boundary of the site is formed by the Horsemill Stream of the River Lea and to the west of that is the River Lea Navigation and further west again is the Small River Lea.

3.5 Flood levels in the area have been modelled by the Environment Agency which indicate that some flooding occurs in various locations throughout the site. The applicable flood level for Building H7 is between 19.44m and 19.45 metres.

3.6 The second form of flood risk to be considered in accordance with Annex C of Planning Policy Statement 25 is tidal flooding. However, in this instance it is not considered that the site is at risk of tidal flooding as its land levels are all in the order of 19 metres above sea level.

1078/09 - FRA- H7 CoU 5 3.7 The third form of flood risk to be considered in accordance with Annex C of Planning Policy Statement 25 is flooding from land.

3.8 Intense rainfall can sometimes fail to be absorbed by the ground and be unable to enter the drainage system which leads to pounding in low areas and flow over the surface of the land from high areas to low areas.

3.9 There is an existing surface water drainage system for this area of the Museum site which drains surface water from the existing buildings and roadways and in the event of intense rainfall overloading the system some localised surface water flooding would occur. The lower points on the site would fill up with surface water which will eventually flow into the adjacent former canals.

3.10 The fourth form of flood risk to be considered in accordance with Annex C of Planning Policy Statement 25 is flooding from rising groundwater.

3.11 Groundwater flooding occurs when water levels in the ground rise above surface elevations. This is most likely to occur in low lying areas underlain by permeable rocks.

3.12 The site is shown on the geological map (Appendix 11) as alluvial underlain by River Terrace Sand and Gravel, but the gravel strata are probably in hydraulic continuity with the Old River Lea to the east of the site and it is unlikely that rising groundwater levels would affect the site to any greater degree than a fluvial flood.

3.13 The fifth form of flood risk to be considered in accordance with Annex C of Planning Policy Statement 25 is flooding from blocked or overloaded sewers.

1078/09 - FRA- H7 CoU 6 3.14 The sewerage system on the site is owned and operated by the site owner and it is in their interests to ensure that the system is maintained and operates efficiently. In the event of a blockage personnel are on hand to deal with the problem and minimise the risk of flooding of any of the buildings.

3.15 The last form of flood risk to be considered in accordance with Annex C of Planning Policy Statement 25 is flooding from reservoirs, canals or other artificial sources. The River Lea’s system is now largely artificial and managed by the Environment Agency. It’s the catchment does contain a number of reservoirs and storage areas, but it is considered that the risk of flooding from these is no greater than from a fluvial flood.

1078/09 - FRA- H7 CoU 7 4 THE PROPOSAL

4.1 The proposal is to change the use of the existing Building H7 from shop and reception area for the Museum to an office building with no external alterations.

4.2 The existing access and egress routes are through the existing blast bank and a 750 mm high flood gate will be installed in the two access points to protect the building from flooding up to a level of 19.75m which is 300 mm above the modelled in 1 in 100 year plus climate change flood level in the adjacent Horsemill Stream.

4.3 The external fabric of the building will be generally repaired and joinery and metal work repainted and restored to its original condition.

4.4 The building has an existing floor level of 19.22 metres which will remain unchanged.

4.5 The Building is within the 1 in 100 year plus climate change flood plain (Appendix 4) and would be surrounded by flood waters to a shallow depth in a 1 in 100 year plus climate change flood.

4.6 Emergency Access Route

4.6.1 The main emergency route for this Building H7 is south either passed the existing security office at the gate and then across Hoppit Road to Beaulieu Drive or directly onto Beaulieu Drive and over with Hoppit Road and then southwards along Beaulieu Drive to the Highbridge Street.

4.6.2 This route to Beaulieu Drive south of Hoppit Road has existing land levels which vary between, 19.2 metres and 19.39 metres. There would be a hard paved route which was either dry or subject to such shallow flooding with low velocities that the combination

1078/09 - FRA- H7 CoU 8 of depth and velocity would fall within the white cells of Table 13.1 of FD 2320/TR2 and be considered safe for all to pass through and therefore provides a safe access in a 1 in 100 year plus climate change flood event. (Appendix 7)

4.7 Beaulieu Drive

4.7.1 All vehicular access routes within the site use Beaulieu Drive to provide access. Spot levels have been taken along Beaulieu Drive to the main road from which it can be seen that the access in a 1 in 100 year event with climate change is mainly dry with a slight risk at the extreme southern end that there maybe some flow across Highbridge Street. However, the River at this point is constrained by the feature brick walls and it is considered unlikely that water would escape onto Highbridge Road which would provide a safe dry access into Waltham Abbey. Even if water did escape in a 1 in 100 year plus climate change flood event it would only be 20 mm deep flowing across a small area of footway southwards. This fall within the white cells of Table 13.1 of FD 2320/TR2 and is considered safe for all to walk or drive through (Appendix 7).

1078/09 - FRA- H7 CoU 9 5 THE ASSESSMENT

5.1 The development proposed is a change of use from a commercial shop and reception building to an office which falls within the less vulnerable category in accordance with Table D2 of Planning Policy Statement 25.

5.2 The proposal is the change of use of the existing building which should be considered in accordance with paragraph 4.38 of the Development and Flood Risk Practice Guide Supplement to Planning Policy Statement 25 as the change of use from a “less vulnerable use” to another “less vulnerable use” and should not be subject to the Sequential or Exception Tests.

5.3 In accordance with Table D1 of Planning Policy Statement 25 a less vulnerable use is appropriate in flood zone 3A. This site is shown on the Environment Agency’s indicative flood risk map as defended flood zone three. A check of the level of the building indicates that in a 1 in 100 year flood with climate change that the building could have 220mm of water on the floor.

5.4 It can also be determined that the majority of the area to the south is above the 1 in 100 year plus climate change flood levels and those areas of the site which may be subject to flooding will only be subject to shallow flooding and there will be a safe access route out.

5.5 It is considered that the change of use which does not change the vulnerablity classification would pass the Sequential Test and in accordance with Table D3 of Planning Policy Statement 25 and the proposed development is appropriate without the Exception Test being applied.

1078/09 - FRA- H7 CoU 10 5.6 This is previously developed land and the building currently exists and there will be no increase in the area of its footprint.

5.7 The site has a safe access both in the current 1 in 100 year event and when climate change is allowed for.

5.8 The site management will make use of the Environment Agency’s flood warning system to ensure that in the event of a flood which would affect the site being likely than the evacuation procedures would be commenced.

5.9 The various sources of flooding have been identified in section 3 this report and there are no significant risks to the proposals from the current 1 in 100 year modelled flood or in the 1 in 100 year plus climate change modelled flood.

5.10 The existing surface water arrangements for the building are the discharge of surface water to the existing piped system and this will be maintained.

5.11 The proposals are considered by Planning Policy Statement 25 to be a suitable use in flood zone 3A and they only involve the change of use of an existing commercial building to another commercial use, both of which are considered to be less vulnerable uses in accordance with Planning Policy Statement 25. It is considered the site risk has been considered taking into account climate change.

5.12 There are no flood risk management measures required as part of the change of use of the existing Building H7 as the building already exists.

5.13 There will be a safe access and egress from the site even when climate change is allowed for.

1078/09 - FRA- H7 CoU 11 5.14 There will be no adverse impacts off the site as there will be no increase in surface water run-off.

5.15 The site is operated as a museum currently and this will continue and the management will ensure that there is an emergency procedure to be followed in the event of a significant flood risk to ensure that the public and any people working on the site are aware of a potential flood and can be evacuated if necessary prior to any flooding occurring which would place them at risk.

1078/09 - FRA- H7 CoU 12 6 CONCLUSION

6.1 The proposed change of use of the Building H7 from shop and reception area to an office is an appropriate use and there is a safe emergency access and egress route.

6.2 There are no grounds under Planning Policy Statement 25 to object to the proposed change of use of Building H7 as set out in this flood risk assessment.

1078/09 - FRA- H7 CoU 13 APPENDIX 1 SITE LOCATION PLAN

1078/09 - FRA- H7 CoU 14 PT2300\D\ACAD12\1078-SITE LOCATION PLAN H7 APPENDIX 2 ENVIRONMENT AGENCY’S INDICATIVE FLOOD RISK MAP

1078/09 - FRA- H7 CoU 15 PT2300\D\ACAD12\EA-1078-EA-IFRM APPENDIX 3 RIVER LEA FLOOD MODELLING NODE LOCATIONS AND LEVELS

1078/09 - FRA- H7 CoU 16 Node Easting Northing Model Flow_2 Level_2 Flow_5 Level_5 Flow_10 Level_10 Flow_20 Level_20 Flow_25 Level_25 Flow_50 Level_50 Flow_100 Level_100 Flow_100c Level_100c Flow_200 Level_200 Flow_1000 Level_1000 Confidence

HC20U 537,676.50 202,644.66 L09-L10 54.87 19.90 82.16 20.14 98.67 20.30 110.22 20.42 113.81 20.46 127.99 20.72 127.10 20.87 126.59 21.03 128.91 21.03 127.11 21.38 1 CM.042 537,674.13 202,623.86 L09-L10 3.22 19.78 3.16 19.78 3.20 19.79 3.48 19.79 3.33 19.79 3.50 19.79 3.34 19.79 3.31 19.79 3.43 19.79 4.61 20.06 1 CM.041u 537,674.75 202,621.69 L09-L10 3.22 19.78 3.16 19.78 3.20 19.78 3.48 19.79 3.33 19.78 3.50 19.79 3.34 19.79 3.31 19.79 3.43 19.79 4.61 20.06 1 CM.041 537,674.44 202,617.19 L09-L10 3.22 19.78 3.16 19.78 3.20 19.78 3.48 19.79 3.33 19.78 3.50 19.79 3.34 19.79 3.31 19.79 3.43 19.79 4.61 20.06 1 CM.040 537,665.44 202,564.66 L09-L10 3.21 19.78 3.16 19.78 3.20 19.79 3.47 19.79 3.32 19.79 3.49 19.79 3.33 19.79 3.30 19.79 3.42 19.79 4.61 20.06 1 CM.039 537,624.31 202,493.97 L09-L10 3.19 19.78 3.15 19.78 3.18 19.78 3.44 19.79 3.28 19.78 3.46 19.79 3.30 19.79 3.28 19.79 3.38 19.79 4.61 20.06 1 CM.038 537,599.25 202,401.47 L09-L10 3.18 19.77 3.14 19.77 3.17 19.78 3.41 19.79 3.26 19.78 3.43 19.79 3.27 19.78 3.26 19.79 3.35 19.78 4.61 20.06 1 CM.037 537,599.69 202,321.20 L09-L10 3.17 19.77 3.13 19.77 3.15 19.78 3.38 19.78 3.22 19.78 3.39 19.79 3.24 19.78 3.23 19.78 3.32 19.78 4.61 20.05 1 CM.035u 537,656.75 202,265.38 L09-L10 3.18 19.77 3.20 19.77 3.26 19.78 3.47 19.78 3.32 19.78 3.49 19.78 3.35 19.78 3.36 19.78 3.42 19.78 4.61 20.05 1 CM.035 537,660.38 202,259.05 L09-L10 2.11 19.77 2.12 19.77 2.16 19.78 2.36 19.78 2.23 19.78 2.37 19.78 2.25 19.78 2.24 19.78 2.31 19.78 6.54 20.05 1 OLC001 537,737.50 201,669.97 L09-L10 1.40 17.89 1.45 17.92 1.49 17.95 1.53 17.97 1.51 17.98 1.54 18.26 1.59 18.56 1.52 19.10 1.48 19.08 3.59 19.73 1 CM.001 537,928.06 200,560.91 L09-L10 1.40 17.87 1.41 17.89 1.42 17.92 1.44 17.95 1.44 17.95 1.57 18.25 1.59 18.48 1.62 18.78 1.62 18.77 2.16 19.28 1 OL.039 537,655.69 202,253.14 L09-L10 1.08 19.44 1.08 19.45 1.10 19.45 1.11 19.46 1.10 19.45 1.12 19.46 1.11 19.46 1.11 19.46 1.11 19.46 1.16 20.49 1 OL.037 537,654.31 202,250.31 L09-L10 1.08 19.35 1.08 19.35 1.10 19.36 1.11 19.36 1.10 19.36 1.12 19.37 1.11 19.36 1.11 19.36 1.11 19.36 1.16 20.48 1 OL.033 537,630.19 202,195.89 L09-L10 1.07 17.92 1.09 17.93 1.09 17.96 1.10 17.99 1.11 17.99 1.11 18.28 1.11 18.56 1.11 19.18 1.11 19.16 1.23 20.58 1 OL.032 537,614.00 202,182.98 L09-L10 1.07 17.92 1.08 17.93 1.08 17.96 1.10 17.99 1.10 17.99 1.10 18.28 1.11 18.56 1.13 19.17 1.12 19.16 1.25 20.58 1 OL.031 537,610.63 202,177.23 L09-L10 1.07 17.92 1.08 17.93 1.08 17.96 1.10 17.99 1.10 17.99 1.10 18.28 1.11 18.56 1.14 19.17 1.13 19.16 1.25 20.58 1 OL.030 537,603.69 202,172.08 L09-L10 1.07 17.91 1.08 17.93 1.08 17.96 1.10 17.99 1.10 17.99 1.10 18.28 1.11 18.56 1.14 19.17 1.13 19.16 1.25 20.58 1 OL.029u 537,589.00 202,130.66 L09-L10 1.06 17.91 1.08 17.93 1.08 17.96 1.09 17.99 1.09 17.99 1.10 18.28 1.11 18.56 1.16 19.17 1.15 19.16 1.27 20.58 1 OL.029d 537,587.63 202,128.06 L09-L10 1.06 17.91 1.08 17.93 1.08 17.96 1.09 17.99 1.09 17.99 1.10 18.28 1.11 18.56 1.16 19.17 1.15 19.16 1.27 20.58 1 OL.028 537,558.81 202,071.69 L09-L10 1.07 17.91 1.08 17.93 1.07 17.96 1.10 17.99 1.08 17.99 1.13 18.28 1.16 18.56 1.73 19.17 1.66 19.16 6.80 20.58 1 OL.027u 537,579.50 201,997.23 L09-L10 1.09 17.91 1.07 17.93 1.07 17.96 1.10 17.98 1.07 17.99 1.19 18.27 1.23 18.56 4.98 19.17 4.74 19.15 20.88 20.58 1 OL.027d 537,579.25 201,994.67 L09-L10 1.09 17.91 1.07 17.93 1.07 17.96 1.10 17.98 1.07 17.99 1.19 18.27 1.23 18.56 4.98 19.16 4.74 19.14 20.88 20.47 1 OL.026u 537,552.13 201,939.95 L09-L10 1.11 17.91 1.08 17.93 1.07 17.96 1.11 17.98 1.06 17.99 1.23 18.27 1.27 18.56 4.98 19.16 4.74 19.14 20.87 20.46 1 OL.026 537,541.88 201,926.72 L09-L10 1.11 17.91 1.08 17.93 1.07 17.96 1.11 17.98 1.06 17.99 1.24 18.27 1.28 18.56 4.98 19.14 4.74 19.12 20.87 20.10 1 OL.025 537,528.63 201,904.81 L09-L10 1.12 17.91 1.08 17.93 1.07 17.96 1.11 17.98 1.05 17.99 1.26 18.27 1.31 18.56 4.97 19.14 4.74 19.12 20.87 20.11 1 OL.024 537,488.50 201,819.45 L09-L10 1.14 17.90 1.09 17.92 1.09 17.96 1.11 17.98 1.05 17.99 1.36 18.27 1.47 18.56 4.97 19.13 4.73 19.12 20.86 20.09 1 OL.023u 537,559.75 201,798.56 L09-L10 1.15 17.90 1.10 17.92 1.10 17.95 1.11 17.98 1.05 17.99 1.39 18.27 1.54 18.56 4.97 19.13 4.73 19.11 20.85 20.04 1 OL.022u 537,596.38 201,796.06 L09-L10 1.15 17.90 1.10 17.92 1.10 17.95 1.11 17.98 1.05 17.98 1.40 18.26 1.56 18.56 4.97 19.12 4.73 19.10 20.85 19.89 1 OL.022d 537,603.56 201,798.08 L09-L10 1.15 17.90 1.10 17.92 1.10 17.95 1.11 17.98 1.05 17.98 1.40 18.26 1.56 18.56 4.97 19.11 4.73 19.10 20.85 19.80 1 OL.021 537,631.56 201,802.33 L09-L10 1.16 17.90 1.10 17.92 1.11 17.95 1.11 17.98 1.06 17.98 1.41 18.26 1.59 18.56 4.96 19.11 4.73 19.10 20.85 19.84 1 OL.020 537,672.19 201,737.52 L09-L10 1.17 17.90 1.11 17.92 1.12 17.95 1.11 17.97 1.06 17.98 1.42 18.26 1.67 18.56 4.96 19.10 4.71 19.09 20.84 19.83 1 OL.019u 537,725.63 201,676.91 L09-L10 1.20 17.89 1.21 17.92 1.25 17.95 1.23 17.97 1.18 17.98 1.40 18.26 1.76 18.56 4.95 19.10 4.71 19.08 20.84 19.79 1 OL.019d 537,728.06 201,656.81 L09-L10 2.54 17.89 2.60 17.92 2.62 17.95 2.76 17.97 2.61 17.98 2.78 18.26 3.00 18.56 6.39 19.10 6.15 19.08 24.43 19.73 1 OL.018 537,707.25 201,636.70 L09-L10 2.55 17.89 2.61 17.92 2.62 17.95 2.76 17.97 2.61 17.98 2.78 18.26 3.04 18.56 6.39 19.10 6.15 19.08 24.43 19.75 1 OL.017u 537,717.75 201,515.55 L09-L10 2.56 17.89 2.63 17.92 2.61 17.95 2.77 17.97 2.59 17.98 2.78 18.26 3.17 18.55 6.39 19.09 6.14 19.08 24.43 19.73 1 MS.020 537,714.13 201,504.19 L09-L10 1.28 17.89 1.32 17.92 1.31 17.95 1.37 17.97 1.31 17.98 1.37 18.26 1.41 18.55 1.36 19.09 1.37 19.08 2.48 19.73 1 MS.019 537,696.19 201,489.16 L09-L10 1.28 17.89 1.32 17.92 1.31 17.95 1.37 17.97 1.31 17.98 1.37 18.26 1.41 18.56 1.38 19.09 1.39 19.08 2.48 19.74 1 MS.018 537,653.25 201,452.77 L09-L10 1.29 17.89 1.33 17.92 1.30 17.95 1.37 17.97 1.31 17.98 1.37 18.26 1.41 18.56 1.42 19.09 1.43 19.08 2.47 19.74 1 MS.017u 537,675.13 201,397.89 L09-L10 1.30 17.89 1.33 17.92 1.30 17.95 1.37 17.97 1.31 17.98 1.39 18.26 1.44 18.56 1.46 19.09 1.47 19.08 9.09 19.73 1 MS.017 537,675.81 201,393.02 L09-L10 1.30 17.89 1.33 17.92 1.30 17.95 1.37 17.97 1.31 17.98 1.39 18.26 1.44 18.56 1.46 19.09 1.47 19.08 9.09 19.72 1 MS.016 537,697.63 201,337.53 L09-L10 1.31 17.89 1.34 17.91 1.30 17.94 1.37 17.97 1.31 17.98 1.42 18.26 1.48 18.56 1.50 19.09 1.52 19.08 9.09 19.72 1 MS.015u 537,734.75 201,258.02 L09-L10 1.32 17.89 1.34 17.91 1.30 17.94 1.37 17.97 1.32 17.98 1.45 18.26 1.54 18.56 1.58 19.09 1.59 19.08 9.08 19.71 1 MS.015 537,736.81 201,253.47 L09-L10 1.32 17.89 1.34 17.91 1.30 17.94 1.37 17.97 1.32 17.98 1.45 18.26 1.54 18.56 1.58 19.09 1.59 19.08 9.08 19.70 1 MS.014 537,755.31 201,209.75 L09-L10 1.33 17.89 1.35 17.91 1.30 17.94 1.37 17.97 1.33 17.98 1.47 18.26 1.59 18.56 1.63 19.09 1.64 19.08 9.08 19.70 1 MS.013u 537,791.31 201,112.95 L09-L10 1.35 17.89 1.36 17.91 1.31 17.94 1.37 17.97 1.35 17.98 1.50 18.26 1.68 18.56 1.73 19.09 1.74 19.08 9.08 19.69 1 MS.013 537,792.63 201,110.23 L09-L10 1.35 17.89 1.36 17.91 1.31 17.94 1.37 17.97 1.35 17.98 1.50 18.26 1.68 18.56 1.73 19.09 1.74 19.08 9.08 19.69 1 MS.012 537,806.19 201,059.69 L09-L10 1.35 17.89 1.36 17.91 1.31 17.94 1.37 17.97 1.36 17.98 1.51 18.26 1.73 18.56 1.78 19.09 1.79 19.08 9.08 19.69 1 MS.011 537,733.38 201,004.36 L09-L10 1.40 17.89 1.46 17.91 1.43 17.94 1.48 17.97 1.49 17.98 1.53 18.26 1.82 18.56 1.88 19.09 1.89 19.08 2.59 19.69 1 MS.010 537,732.38 200,999.20 L09-L10 1.40 17.89 1.46 17.91 1.43 17.94 1.48 17.97 1.49 17.98 1.53 18.26 1.82 18.56 1.88 19.09 1.89 19.08 2.59 19.70 1 MS.009 537,724.25 200,950.59 L09-L10 1.40 17.89 1.46 17.91 1.43 17.94 1.48 17.97 1.49 17.98 1.53 18.26 2.01 18.56 12.92 19.07 12.28 19.06 24.82 19.66 1 MS.008 537,727.31 200,888.41 L09-L10 1.42 17.89 1.46 17.91 1.42 17.94 1.47 17.97 1.48 17.98 1.52 18.26 2.01 18.56 11.22 19.07 10.52 19.06 47.39 19.52 1 MS.007u 537,726.69 200,879.44 L09-L10 1.42 17.89 1.46 17.91 1.42 17.94 1.47 17.97 1.48 17.98 1.52 18.26 2.01 18.56 11.22 19.07 10.52 19.06 47.39 19.52 1 MS.007 537,722.75 200,876.42 L09-L10 1.42 17.89 1.46 17.91 1.42 17.94 1.47 17.97 1.48 17.97 1.52 18.26 2.01 18.55 11.22 19.06 10.52 19.05 47.39 19.39 1 MS.006 537,696.56 200,780.27 L09-L10 1.44 17.89 1.48 17.91 1.41 17.94 1.44 17.97 1.46 17.97 1.53 18.26 2.09 18.55 9.99 19.06 9.39 19.05 47.73 19.35 1 MS.005 537,703.06 200,680.97 L09-L10 1.47 17.89 1.50 17.91 1.39 17.94 1.41 17.97 1.45 17.97 1.58 18.26 2.24 18.55 4.01 19.06 3.96 19.06 20.30 19.40 1 MS.004u 537,710.31 200,576.55 L09-L10 1.49 17.89 1.51 17.91 1.39 17.94 1.38 17.97 1.44 17.97 1.63 18.26 2.35 18.55 3.78 19.06 3.78 19.05 3.77 19.43 1

MS.004 537,713.00 200,560.58 L09-L10 1.49 17.87 1.51 17.89 1.39 17.92 1.38 17.94 1.44 17.95 1.63 18.25 2.35 18.47 3.78 18.76 3.78 18.76 3.77 19.28 1 Desk\C\MyFiles\wpdocs\1078 - Map Info Table MS.003u 537,716.44 200,554.28 L09-L10 1.49 17.87 1.51 17.89 1.39 17.92 1.38 17.94 1.44 17.95 1.63 18.25 2.35 18.47 3.78 18.76 3.78 18.75 3.77 19.28 1 MS.003 537,716.44 200,552.28 L09-L10 1.49 17.87 1.51 17.89 1.39 17.92 1.38 17.94 1.44 17.95 1.63 18.25 2.35 18.47 3.78 18.76 3.78 18.75 3.77 19.28 1 MS.002 537,740.13 200,478.42 L09-L10 1.50 17.87 1.52 17.89 1.40 17.92 1.35 17.94 1.43 17.95 1.67 18.25 2.43 18.47 3.78 18.76 3.79 18.75 3.79 19.28 1 MS.001 537,735.44 200,465.38 L09-L10 1.51 17.87 1.53 17.89 1.40 17.92 1.34 17.94 1.43 17.95 1.68 18.25 2.45 18.47 3.79 18.76 3.79 18.75 3.80 19.28 1 OL.017d 537,722.50 201,501.27 L09-L10 1.30 17.89 1.31 17.92 1.32 17.95 1.40 17.97 1.28 17.98 1.62 18.26 3.39 18.55 8.03 19.09 8.00 19.08 22.10 19.73 1 Node Easting Northing Model Flow_2 Level_2 Flow_5 Level_5 Flow_10 Level_10 Flow_20 Level_20 Flow_25 Level_25 Flow_50 Level_50 Flow_100 Level_100 Flow_100c Level_100c Flow_200 Level_200 Flow_1000 Level_1000 Confidence

OL.016 537,760.75 201,437.56 L09-L10 1.31 17.89 1.32 17.92 1.32 17.95 1.40 17.97 1.27 17.98 1.58 18.26 3.39 18.55 8.01 19.09 7.98 19.08 22.10 19.73 1 OL.015 537,772.88 201,338.70 L09-L10 1.32 17.89 1.32 17.92 1.31 17.94 1.38 17.97 1.26 17.98 1.54 18.26 3.40 18.55 7.98 19.08 7.95 19.07 23.09 19.71 1 OL.014 537,793.31 201,240.95 L09-L10 1.34 17.89 1.33 17.92 1.31 17.94 1.37 17.97 1.25 17.97 1.57 18.26 3.40 18.55 7.96 19.08 7.93 19.06 23.09 19.70 1 OL.013 537,876.56 201,185.31 L09-L10 1.36 17.89 1.34 17.91 1.30 17.94 1.35 17.97 1.26 17.97 1.63 18.26 3.40 18.55 7.94 19.07 7.91 19.06 23.09 19.68 1 OL.012 537,883.44 201,094.08 L09-L10 1.38 17.89 1.36 17.91 1.30 17.94 1.34 17.97 1.28 17.97 1.71 18.26 3.40 18.54 7.91 19.07 7.88 19.05 23.09 19.67 1 OL.011 537,836.63 201,030.05 L09-L10 1.40 17.88 1.37 17.91 1.29 17.94 1.32 17.97 1.32 17.97 1.77 18.26 3.40 18.54 7.88 19.06 7.85 19.05 23.09 19.66 1 OL.010 537,849.13 200,936.25 L09-L10 1.44 17.88 1.47 17.91 1.40 17.94 1.43 17.97 1.49 17.97 1.83 18.26 3.40 18.54 9.62 19.05 9.55 19.04 14.28 19.67 1 OL.009 537,881.25 200,843.38 L09-L10 1.46 17.88 1.49 17.91 1.42 17.94 1.42 17.97 1.53 17.97 1.87 18.26 3.40 18.54 9.62 19.05 9.55 19.03 14.27 19.66 1 OL.008 537,900.31 200,759.27 L09-L10 1.48 17.88 1.50 17.90 1.43 17.94 1.41 17.97 1.54 17.97 1.92 18.26 3.40 18.54 9.62 19.03 9.55 19.02 14.26 19.66 1 OL.007u 537,903.38 200,753.38 L09-L10 1.49 17.88 1.51 17.90 1.43 17.94 1.41 17.97 1.54 17.97 1.92 18.26 3.40 18.54 9.62 19.03 9.55 19.02 14.25 19.65 1 OL.007d 537,909.81 200,707.73 L09-L10 1.49 17.88 1.51 17.90 1.43 17.94 1.40 17.97 1.53 17.97 1.94 18.26 3.41 18.54 9.62 19.03 9.55 19.02 14.25 19.65 1 OL.006u 537,908.06 200,610.52 L09-L10 1.51 17.87 1.52 17.90 1.43 17.93 1.38 17.96 1.51 17.96 1.96 18.26 3.41 18.51 9.62 18.90 9.55 18.89 14.25 19.50 1 OL.006d 537,912.00 200,601.98 L09-L10 1.51 17.87 1.52 17.89 1.43 17.92 1.38 17.95 1.51 17.95 1.96 18.25 3.41 18.47 9.62 18.74 9.55 18.73 14.25 19.20 1 OL.005 537,928.69 200,567.94 L09-L10 1.51 17.87 1.53 17.89 1.43 17.92 1.38 17.95 1.50 17.95 1.97 18.25 3.41 18.48 9.62 18.78 9.55 18.77 14.25 19.28 1 OL.005d 537,916.63 200,556.31 L09-L10 2.89 17.87 2.90 17.89 2.79 17.92 2.82 17.95 2.93 17.95 3.38 18.25 4.78 18.48 11.03 18.78 10.96 18.77 16.39 19.28 1 OL.004 537,829.44 200,507.38 L09-L10 2.91 17.87 2.92 17.89 2.75 17.92 2.77 17.94 2.87 17.95 3.38 18.25 4.62 18.47 6.67 18.78 6.65 18.77 10.95 19.28 1 OL.003 537,753.06 200,464.34 L09-L10 2.95 17.87 2.94 17.89 2.70 17.92 2.71 17.94 2.83 17.95 3.43 18.25 4.89 18.47 11.14 18.76 11.06 18.76 16.49 19.28 1 OL.003d 537,740.81 200,452.56 L09-L10 4.46 17.87 4.46 17.89 4.06 17.92 4.06 17.94 4.26 17.95 4.91 18.25 7.08 18.47 22.25 18.76 21.48 18.75 73.61 19.28 1 OL.002 537,722.13 200,425.56 L09-L10 4.48 17.87 4.47 17.89 4.06 17.92 4.03 17.94 4.26 17.95 4.95 18.25 7.15 18.47 22.25 18.77 21.48 18.76 73.61 19.21 1 OL.002d 537,717.31 200,419.98 L09-L10 4.48 17.87 4.47 17.89 4.06 17.92 4.03 17.94 4.26 17.95 4.95 18.25 7.15 18.47 22.25 18.76 21.48 18.76 73.61 19.17 1 OL.001 537,641.50 200,367.55 L09-L10 4.55 17.87 4.53 17.89 4.07 17.92 3.97 17.94 4.25 17.95 5.31 18.25 7.39 18.47 22.25 18.76 21.48 18.75 73.61 19.13 1 HC20MD 537,664.88 202,631.02 L09-L10 53.34 19.90 80.10 20.14 96.36 20.30 107.75 20.42 111.29 20.46 125.31 20.72 124.24 20.87 123.59 21.03 126.22 21.03 124.03 21.38 1 HC20 537,660.56 202,628.03 L09-L10 53.34 19.90 80.10 20.14 96.36 20.30 107.75 20.42 111.29 20.46 125.31 20.71 124.24 20.86 123.59 21.03 126.23 21.02 124.03 21.38 1 HC20D 537,651.69 202,622.06 L09-L10 53.34 19.87 80.10 20.08 96.36 20.22 107.75 20.31 111.29 20.34 125.31 20.46 124.24 20.50 123.59 20.69 126.23 20.69 124.03 21.09 1 HC21 537,572.75 202,603.14 L09-L10 53.35 19.84 80.10 20.01 96.37 20.14 107.75 20.22 111.29 20.25 125.43 20.37 124.21 20.42 123.66 20.61 126.20 20.60 142.52 20.85 1 HC22 537,500.81 202,530.91 L09-L10 53.36 19.83 80.11 20.00 96.38 20.12 107.75 20.21 111.29 20.24 125.56 20.37 124.21 20.43 123.76 20.62 126.16 20.61 142.52 20.87 1 HC23 537,413.44 202,482.19 L09-L10 53.38 19.79 80.11 19.94 96.38 20.05 107.75 20.13 111.30 20.16 125.57 20.28 124.30 20.35 123.94 20.55 125.77 20.55 142.91 20.80 1 HC24 537,383.00 202,387.88 L09-L10 53.39 19.77 80.11 19.89 96.39 19.98 107.75 20.05 111.30 20.08 125.50 20.20 124.27 20.28 124.52 20.50 125.21 20.49 142.91 20.75 1 HC25 537,382.88 202,286.36 L09-L10 53.41 19.73 80.11 19.81 96.40 19.88 107.75 19.93 111.30 19.95 125.42 20.07 124.81 20.17 125.75 20.41 125.79 20.40 142.90 20.65 1 HC26 537,389.50 202,189.70 L09-L10 53.43 19.71 80.12 19.77 96.41 19.83 107.75 19.86 111.31 19.88 125.38 20.00 125.73 20.12 126.62 20.35 126.68 20.35 142.89 20.59 1 HC27 537,395.44 202,088.81 L09-L10 53.44 19.71 80.12 19.77 96.42 19.82 107.75 19.85 111.31 19.87 126.57 19.99 126.95 20.11 127.13 20.35 127.22 20.34 134.17 20.62 1 HC28 537,373.19 201,989.34 L09-L10 53.46 19.69 80.12 19.73 96.43 19.77 107.75 19.80 111.32 19.81 128.42 19.92 128.43 20.06 127.88 20.32 128.81 20.32 129.05 20.62 1 HC29 537,383.88 201,896.17 L09-L10 53.48 19.68 80.12 19.70 96.44 19.72 107.75 19.74 111.32 19.75 130.32 19.87 129.68 20.01 128.96 20.28 130.41 20.28 130.10 20.59 1 HC30U 537,400.19 201,809.69 L09-L10 53.51 19.66 80.12 19.66 96.45 19.66 107.75 19.66 111.33 19.66 134.94 19.74 132.81 19.94 132.01 20.22 133.15 20.22 130.80 20.55 1 HC30D 537,384.25 201,758.45 L09-L10 53.51 18.33 80.12 18.69 96.45 18.89 107.75 19.04 111.33 19.09 134.94 19.37 132.81 19.52 132.01 19.77 133.15 19.76 130.80 20.04 1 HC31 537,378.44 201,692.06 L09-L10 53.51 18.32 80.12 18.67 96.45 18.87 107.75 19.02 111.33 19.07 133.01 19.35 131.85 19.50 130.34 19.76 131.09 19.75 130.97 20.04 1 HC32 537,404.19 201,593.69 L09-L10 53.51 18.22 80.12 18.53 96.45 18.73 107.75 18.87 111.33 18.92 132.27 19.20 130.93 19.41 130.25 19.69 131.01 19.68 131.03 19.98 1 HC33 537,426.81 201,495.66 L09-L10 53.50 18.21 80.11 18.52 96.45 18.71 107.75 18.86 111.33 18.91 131.57 19.19 130.97 19.41 129.69 19.67 130.72 19.67 130.83 19.98 1 HC34 537,438.56 201,396.34 L09-L10 53.50 18.19 80.11 18.50 96.44 18.68 107.75 18.83 111.33 18.88 130.97 19.16 130.96 19.38 129.37 19.65 129.78 19.64 130.45 19.98 1 HC35 537,479.81 201,303.78 L09-L10 53.50 18.14 80.10 18.42 96.44 18.60 107.75 18.74 111.33 18.79 130.11 19.08 130.71 19.31 133.46 19.57 133.28 19.57 135.78 19.92 1 HC36 537,503.81 201,206.16 L09-L10 53.50 18.11 80.10 18.38 96.43 18.56 107.75 18.70 111.33 18.74 129.72 19.04 130.03 19.27 141.67 19.52 141.26 19.51 151.94 19.85 1 HC37 537,515.75 201,106.84 L09-L10 53.50 18.07 80.10 18.31 96.42 18.48 107.75 18.61 111.32 18.66 129.41 18.96 129.50 19.21 146.52 19.44 145.94 19.43 167.18 19.76 1 HC38 537,523.06 201,006.98 L09-L10 53.50 18.05 80.10 18.27 96.41 18.44 107.75 18.57 111.32 18.61 128.88 18.93 129.32 19.19 132.06 19.45 131.97 19.44 135.73 19.81 1 HC39 537,543.94 200,908.88 L09-L10 53.50 18.02 80.10 18.22 96.40 18.38 107.75 18.51 111.31 18.55 128.46 18.88 128.86 19.15 128.08 19.44 128.29 19.43 127.74 19.81 1 HC40 537,581.81 200,812.02 L09-L10 53.49 18.01 80.10 18.21 96.39 18.36 107.75 18.49 111.31 18.53 127.75 18.86 128.01 19.13 127.34 19.43 127.51 19.42 124.10 19.81 1 HC41 537,580.75 200,710.55 L09-L10 53.49 17.99 80.10 18.18 96.38 18.33 107.75 18.46 111.30 18.50 126.59 18.83 126.62 19.10 127.71 19.41 127.70 19.40 128.10 19.80 1 HC42 537,554.25 200,628.91 L09-L10 53.49 17.97 80.10 18.13 96.38 18.27 107.75 18.40 111.30 18.43 125.82 18.78 127.40 19.05 137.93 19.35 137.70 19.34 143.87 19.75 1 HC43U 537,583.50 200,550.23 L09-L10 53.49 17.92 80.10 18.02 96.39 18.12 107.75 18.20 111.30 18.23 125.63 18.57 128.19 18.88 142.59 19.16 142.21 19.15 155.68 19.54 1 HC43D 537,585.25 200,540.31 L09-L10 53.49 17.91 80.10 18.00 96.39 18.07 107.75 18.14 111.30 18.16 125.63 18.45 128.19 18.64 142.59 18.86 142.21 18.86 155.68 19.16 1 HC44 537,606.50 200,442.39 L09-L10 53.49 17.88 80.10 17.92 96.39 17.97 107.75 18.00 111.30 18.01 125.47 18.32 128.17 18.53 142.32 18.77 141.96 18.77 153.54 19.12 1 HC45U 537,621.44 200,376.52 L09-L10 53.49 17.87 80.09 17.89 96.40 17.92 107.77 17.94 111.29 17.95 125.36 18.25 127.88 18.47 136.81 18.76 136.66 18.75 143.36 19.13 1 HC45D 537,626.06 200,351.52 L09-L10 56.20 17.87 83.10 17.89 99.69 17.92 111.57 17.94 114.64 17.95 127.75 18.25 133.86 18.47 158.86 18.76 157.94 18.75 216.89 19.13 1 WGA17 537,032.94 202,674.19 L09-L10 0.10 20.66 0.10 20.66 0.10 20.66 0.11 20.66 0.11 20.67 0.11 20.67 0.12 20.67 0.13 20.67 0.13 20.67 4.28 21.27 1 WGA16 536,970.69 202,482.81 L09-L10 0.10 20.66 0.10 20.66 0.10 20.66 0.11 20.66 0.11 20.67 0.11 20.67 0.12 20.67 0.13 20.67 0.13 20.67 4.28 21.27 1 WGA15 536,929.31 202,357.19 L09-L10 0.10 20.66 0.10 20.66 0.10 20.66 0.11 20.66 0.11 20.67 0.11 20.67 0.12 20.67 0.13 20.67 0.13 20.67 4.27 21.27 1 WGA14 536,973.00 202,160.64 L09-L10 0.10 20.66 0.10 20.66 0.10 20.66 0.11 20.66 0.11 20.67 0.11 20.67 0.12 20.67 0.13 20.67 0.13 20.67 4.26 21.27 1 WGA13 537,009.75 201,963.45 L09-L10 0.10 20.66 0.10 20.66 0.10 20.66 0.11 20.66 0.11 20.67 0.11 20.67 0.12 20.67 0.13 20.67 0.13 20.67 3.40 21.27 1

WGA12 537,024.50 201,866.45 L09-L10 0.10 20.66 0.10 20.66 0.10 20.66 0.11 20.66 0.11 20.67 0.11 20.67 0.12 20.67 0.13 20.67 0.13 20.67 3.40 21.27 1 Desk\C\MyFiles\wpdocs\1078 - Map Info Table WGA7 537,048.44 201,780.55 L09-L10 0.10 19.16 0.10 19.16 0.10 19.16 0.11 19.16 0.11 19.16 0.11 19.26 0.12 19.63 0.13 19.65 0.13 19.65 3.40 19.71 1 WGA6 537,081.31 201,595.91 L09-L10 0.10 19.16 0.10 19.16 0.10 19.16 0.11 19.16 0.11 19.16 0.43 19.26 4.30 19.62 6.10 19.65 6.04 19.65 10.55 19.70 1 WGA5 537,118.50 201,399.36 L09-L10 0.10 19.16 0.10 19.16 0.10 19.16 0.11 19.16 0.11 19.16 0.41 19.26 4.28 19.62 5.68 19.64 5.64 19.64 8.60 19.69 1 WGA4 537,175.00 201,099.02 L09-L10 0.10 19.16 0.10 19.16 0.10 19.16 0.11 19.16 0.11 19.16 0.41 19.26 4.25 19.62 5.24 19.64 5.21 19.64 7.01 19.68 1 WGA3 537,207.06 200,938.58 L09-L10 0.10 19.16 0.10 19.16 0.10 19.16 0.11 19.16 0.11 19.16 0.40 19.26 4.25 19.62 5.17 19.64 5.15 19.64 7.21 19.68 1 Node Easting Northing Model Flow_2 Level_2 Flow_5 Level_5 Flow_10 Level_10 Flow_20 Level_20 Flow_25 Level_25 Flow_50 Level_50 Flow_100 Level_100 Flow_100c Level_100c Flow_200 Level_200 Flow_1000 Level_1000 Confidence

CBA113 537,257.50 200,823.63 L09-L10 0.10 19.16 0.10 19.16 0.10 19.16 0.11 19.16 0.11 19.16 0.40 19.26 4.25 19.61 5.17 19.63 5.15 19.63 7.16 19.67 1 CBA112 537,464.00 200,629.06 L09-L10 0.10 19.16 0.10 19.16 0.10 19.16 0.11 19.16 0.11 19.16 0.40 19.26 2.63 19.61 2.79 19.63 2.79 19.63 3.13 19.67 1 CBA106 537,497.38 200,597.73 L09-L10 0.10 17.74 0.10 17.74 0.10 17.74 0.11 17.74 0.11 17.74 0.40 17.82 2.63 18.33 2.79 18.66 2.79 18.65 3.13 19.14 1 CBA104 537,542.81 200,544.05 L09-L10 0.10 17.74 0.10 17.74 0.10 17.74 0.11 17.74 0.11 17.74 0.40 17.82 5.92 18.32 13.56 18.65 13.27 18.64 26.58 19.10 1 CBA101 537,548.38 200,526.08 L09-L10 0.10 17.74 0.10 17.74 0.10 17.74 0.11 17.74 0.11 17.74 0.40 17.82 5.92 18.32 13.56 18.64 13.27 18.63 26.58 19.08 1 CBA100 537,558.63 200,496.34 L09-L10 0.10 17.74 0.10 17.74 0.10 17.74 0.11 17.74 0.11 17.74 0.40 17.82 5.91 18.32 12.45 18.64 12.21 18.63 22.47 19.09 1 OL.036sd 537,650.00 202,225.00 L09-L10 1.08 18.35 1.08 18.35 1.10 18.35 1.11 18.35 1.10 18.36 1.12 18.36 1.11 18.57 1.11 19.18 1.11 19.16 1.16 20.58 1 hc37srd 537,350.00 200,900.00 L09-L10 0.00 18.85 0.00 18.85 0.00 18.85 0.00 18.85 0.00 18.85 0.00 18.85 0.29 19.15 2.85 19.43 2.75 19.42 2.97 19.81 1 hc29srd 537,250.00 201,550.00 L09-L10 0.00 19.00 0.00 19.00 0.00 19.00 0.00 19.00 0.00 19.00 0.00 19.05 0.00 19.54 0.00 19.69 0.00 19.68 0.00 19.98 1 hc20dsrd 537,150.00 202,400.00 L09-L10 0.00 19.10 0.00 19.10 0.00 19.10 0.00 19.10 0.00 19.10 0.00 19.65 0.01 20.36 0.57 20.69 0.57 20.68 0.96 21.09 1 MS.007LD 537,799.63 200,718.17 L09-L10 0.00 18.21 0.00 18.21 0.00 18.21 0.00 18.21 0.00 18.21 0.00 18.21 0.03 18.55 1.23 19.06 1.13 19.05 2.85 19.35 1 MS.012sld 537,791.81 200,964.41 L09-L10 0.00 17.78 0.00 17.78 0.00 17.78 0.00 17.78 0.00 17.78 0.00 17.78 0.00 17.78 0.00 19.06 0.00 19.05 18.43 19.66 1 wga3srd 537,327.00 200,654.00 L09-L10 0.00 17.45 0.00 17.45 0.00 17.45 0.00 17.45 0.00 17.45 0.00 17.45 0.00 18.65 0.00 18.68 0.00 18.68 0.06 19.06 3 wga16sld 537,117.00 202,530.83 L09-L10 0.00 19.10 0.00 19.10 0.00 19.10 0.00 19.10 0.00 19.10 0.00 19.22 0.00 20.36 0.00 20.70 0.00 20.69 0.00 21.10 3 wga14sld 537,086.06 202,267.67 L09-L10 0.00 19.10 0.00 19.10 0.00 19.10 0.00 19.10 0.00 19.10 0.00 19.10 0.00 20.35 0.00 20.69 0.00 20.68 0.87 21.09 3 res3d 537,210.50 202,018.08 L09-L10 0.00 19.10 0.00 19.10 0.00 19.10 0.00 19.10 0.00 19.10 0.00 19.48 1.21 20.35 1.37 20.69 1.38 20.68 1.41 21.09 3 Desk\C\MyFiles\wpdocs\1078 - Map Info Table APPENDIX 4 SURVEY AND FLOOD LINES

1078/09 - FRA- H7 CoU 17 PT2300\D\ACAD12\1078-02\20-5-10 PT2300\D\ACAD12\1078-03\20-5-10 PT2300\D\ACAD12\1078-04\20-5-10 APPENDIX 5 LAYOUT

1078/09 - FRA- H7 CoU 18 BUILDING H7 APPENDIX 6 EXTRACT FROM THE GEOLOGICAL MAP

1078/09 - FRA- H7 CoU 19 Extract from British Geological Survey England and Wales Sheet 239 KEY APPENDIX 7 EXTRACT FROM DEFRA/EA REPORT FLOOD RISK AND NEW DEVELOPMENT PHASE 2 FD/2320/TR2

1078/09 - FRA- H7 CoU 20

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1078/09 - FRA- H7 CoU 21 GLOSSARY

Annual Exceedence Probability The estimated probability of a flood of given magnitude occurring or being exceeded in any year. Expressed as, for example, 1 in 100 chance or 1 per cent.

Adoption of Sewers The transfer of responsibility for the maintenance of a system of sewers to a sewerage undertaker.

Attenuation Reduction of peak flow and increased duration of a flow event.

Award Drain A drain whose maintenance was awarded under the Enclosure Act to an authority usually the District Council.

Balancing Pond A pond designed to attenuate flows by storing run off during peak periods and releasing the water after the flood peak has passed. The pond always contains water. Storage periods may not be long enough to improve water quality.

Catchment A river catchment is the whole area which drains either naturally or with artificial assistance to a river. It includes the drainage channels, tributaries, flood plains, and washlands associated with a river and an estuary where one is present.

Catchment Flood Management A strategic planning tool through which the Environment Agency will seek to Plans (CFMP) work with other key decision-makers within a river catchment to identify and agree policies for sustainable flood risk management.

Climate Change Flood risk may increase due to environmental changes, and one of the key uncertainties in assessing flood risk at present is the extent to which climate change is changing and may change in the future. PPS25 advocates a precautionary approach to deal with the uncertainties of how climate change may affect the sea levels, river flows and flood risk. Current best practice recommends allowing for a 30% increase in extreme rainfall and a 20% increase in river flows over the next 100 years, and a varying rise in sea level dependant on location (www.ukcip.org.uk)

Critical Ordinary Watercourse Ordinary watercourses which the Environment Agency and other operating authorities agree are critical because they have the potential to put large numbers of people and property at risk from flooding.

Design Event A historic or notional flood event of a given annual flood probability, against which the suitability of a proposed development is assessed and mitigation measures, if any, are designed.

Design Event Exceedence Flooding resulting from an event which exceeds the magnitude for which the defences protecting a development were designed – see residual risk.

Design Flood Level The maximum estimated water level during the design event.

Development In accordance with the definitions given in Section 55 of the Town and Country Planning Act 1990, with certain exceptions development means the carrying out of building, engineering, mining or other operations, in on over or under land or the making of any material change in use of any buildings or other land. Drainage (Land Drainage) The Water Resources Act 1991 (as amended by the Environment Act 1995) defines drainage as including: a) defence against water, including sea water; b) irrigation other than spray irrigation; c) warping; and d) the carrying on, for any purpose, of any other practice which involves management of the level of water in a watercourse.

Exceedence Flood Risk A study to assess the risk of a site or area being affected by exceedance flow, Assessment and to assess the impact that any changes made to a site or area will have on the exceedance flood risk.

Exceedance Flow Excess flow that emerges on the surface once the conveyance capacity of a drainage system is exceeded.

Flood Action Group Local community groups who aim to ensure that all authorities work closely together to manage flood risk and to deliver an action plan to minimise flood risk within their area.

Flood Defence Flood defence infrastructure, such as flood walls and embankments, intended to protect an area against flooding to a specified standard of protection.

Flood Estimation Handbook The primary national guide to flood probability estimation in the UK, developed (FEH) by CEH Wallingford. The use of the FEH ensures national consistency in estimating the probability of flooding, although users must be aware of the need to exercise good judgement and recognise the uncertainty inherent in flood estimation. Prediction of flood flows is not an exact science and therefore the results of estimation cannot be guaranteed and the user makes use of them at his own risk.

Flooding Direction A Direction made under the Town and County Planning (Flooding) (England) Direction 2006 whereby a local planning authority must refer a planning application through the Government Office to determine whether it should be called-in for a decision by the Secretary of State where it is proposed to grant planning permission in the face of a sustained objection by the Environment Agency.

Flooding Innundation by river or sea whether caused by inadequate or slow drainage, or by breaches or overtopping of banks or defences.

Flood Effect Mitigation All measures to reduce the effect of flooding on a building and its occupants including flood avoidance, flood resistance and flood resilience.

Flood Return Period/risk The risk of flooding to flood plain areas and property is often described in terms of a return period.

Statistical return periods relate to the long term average time interval between events of a particular magnitude. The 1 in 100 year return period flood has a one percent chance of occurring in any one year, i.e. the odds of it happening are one hundred to one. It does not mean that flooding of this magnitude will only occur once every 100 years.

Flood Risk Management A long-term approach setting out the objectives and options for managing flood Strategy risk taking into account a broad range of technical, social, environmental and economic issues.

Flood Plain Area of land that borders a watercourse, an estuary or the sea, over which water flows in time of flood, or would flow but for the presence of flood defences where they exist. Flood Risk Assessment A study to assess the risk to an area or site from flooding, now and in the (Covers All Scales of future, and to assess the impact that any changes or development on the site Assessment) or area will have on flood risk to the site and elsewhere. It may also identify, particularly at more local levels, how to manage those changes to ensure that flood risk is not increased. PPS25 differentiates between regional, sub- regional/strategic and site-specific flood risk assessments.

Flood Risk Management Any measure which reduces flood risk such as flood defences. Measure

Flood Zone A geographic area within which the flood risk is in a particular range as defined within PPS25.

Flood Map A map produced by the Environment Agency providing an indication of the likelihood of flooding within all areas of England and Wales, assuming there are no flood defences.

Freeboard The difference between the flood defence level and the design flood level.

Greenfield Land Land that has not been previously developed.

Greenfield Rate of Run off Rate of water flow which would occur over the ground surface of undeveloped land to the drainage system.

Hydrology The study of water resources.

Local Development A non-statutory term used to describe a folder of documents which includes all Framework the local planning authority’s Local Development Documents (LDDs). The local development framework will also comprise the Statement of Community Involvement, the local development scheme and the annual monitoring report.

Local Development All development plan documents which will form part of the statutory Documents (LDDs) development plan, as well as supplementary planning documents which do not form part of the statutory development plan.

Local Resilience Forum A group required under the Civil Contingencies Act, 2004 who are responsible for the co-ordination of emergency planning within local areas.

Main River A watercourse designated on a statutory map of Main Rivers, maintained by Defra, on which the Environment Agency has permissive powers to construct and maintain flood defences.

Major Development A major development is a) where the number of dwellings to be provided is ten or more, or the site area is 0.5 ha or more or b). non- residential development, where the floorspace to be provided is 1,000m2 or more, or the site area is 1 ha or more.

Flood and Coastal The Environment Agency, Local Authorities and Internal Drainage Boards with Defence Operating legislative powers to undertake flood and coastal defence works. Authorities

Ordinary Watercourse All rivers, streams, ditches, drains, cuts, dykes, sluices, sewers (other than public sewer) and passages through which water flows which do not form part of a Main River. Local authorities and, where relevant, Internal Drainage Boards have similar permissive powers on ordinary watercourses, as the Environment Agency has on Main Rivers.

PAGN/FCDPAG The DEFRA Flood and Coastal Defence Project Appraisal Guidance (FCDPAG) documents provide advice on best practice for the appraisal of flood and coastal defence projects. Planning Policy Statement A statement of policy issued by central Government to replace Planning Policy (PPS) Guidance notes. Advice on practical implementation is not included in Planning Policy Statements.Rights to carry out certain limited forms of development without the need to make an application for planning permission, as granted under the terms of the Town and Country Planning (General Permitted Development) Order 1995.

Previously-Developed Land Land which is or was occupied by a permanent structure, including the (Often Referred to as curtilage of the developed land and any associated fixed surface infrastructure Brownfield Land) (PPS3 Annex B)

Regional Spatial Strategy A broad development strategy for a region for a 15 to 20 year period prepared (RSS) by the Regional Planning Body.

Resilience Constructing the building in such a way that although flood water may enter the building, its impact is minimised, structural integrity is maintained, and repair, drying & cleaning are facilitated.

Resistance Constructing a building in such a way to prevent flood water entering the building or damaging its fabric. This has the same meaning as flood proof.

Reservoir (large raised) A reservoir that holds at least 25,000 cubic metres of water above natural ground level, as defined by the Reservoirs Act, 1975.

Return Period The long-term average period between events of a given magnitude which have the same annual exceedence probability of occurring.

Residual Risk The risk which remains after all risk avoidance, reduction and mitigation measures have been implemented.

Riparian Relating to, or situated on the banks of a river or watercourse.

River basin management A management plan for all river basins required by the Water Framework plan Directive. These documents will establish a strategic plan for the long term management of the River Basin District, set out objectives for waterbodies and in broad terms what measures are planned to meet these objectives, and act as the main reporting mechanism to the European Commission.

Run-off The flow of water from an area caused by rainfall.

Section 106 Agreement Section 106 of the Town and Country Planning Act 1990 (as amended) allows local planning authorities (LPAs) to negotiate arrangements whereby the developer makes some undertaking if he/she obtains planning permission. These are known interchangeably as planning agreements, planning obligations or planning gain.

Sequential Test PPS25 advocates that planners use a sequential test when considering land allocations for development to avoid flood risk where possible.

Shoreline Management A plan providing a large-scale assessment of the risk to people and to the Plan (SMP) developed, historic and natural environment associated with coastal processes. It presents a policy framework to manage these risks in a sustainable manner.

Soakaway A subsurface structure into which surface water is conveyed, designed to promote infiltration.

Source Control The control of run off at or near its source. Storage Compensation Due to the cumulative impacts of developments on the extent and function of the flood plain, the EA may require compensation storage to be provided at a site where a loss of storage in the flood plain occurs, irrespective of the negligible impacts of individual developments. In other words, an area of ground above the flood plain level must be found that can be excavated to compensate for the flood plain storage volume lost by developing the building area. In addition, the EA may insist that compensation is provided on a ‘level- for-level’ basis, i.e. providing compensation areas at the same level as where storage has been lost, so that there is minimal impact on the flood patterns in the area.

Standard of Protection The design event or standard to which a building, asset or area is protected against flooding, generally expressed as an annual exceedence probability.

Strategic Environmental European Community Directive (2001/42/EC) on the assessment of the effects Assessment (SEA) of certain plans and programmes on the environment. Directive

Sustainable Drainage A sequence of management practices and control structures, often referred to Systems (SUDS) as SUDS, designed to drain water in a more sustainable manner than some conventional techniques. Typically these are used to attenuate run-off from development sites.

Sustainability Appraisal An integral part of the plan-making process which seeks to appraise the economic, social and environmental effects of a plan in order to inform decision-making that aligns with sustainable development principles.

Swale A grass-lined channel designed to drain water from a site as well as controlling the flow and quality of the surface water.

Vulnerability Classes PPS25 provides a vulnerability classification to assess which uses of land maybe appropriate in each flood risk zone.

Washland An area of the floodplain that is allowed to flood or is deliberately flooded by a river or stream for flood management purposes.

Watercourse Any natural or artificial channel which conveys surface water.

Water Framework A European Community Directive (2000/60/EC) of the European Parliament Directive and Council designed to integrate the way we manage water bodies across Europe. It requires all inland and coastal waters to reach “good status” by 2015 through a catchmentbased system of River Basin Management Plans (RBMP) incorporating a programme of measures to improve the status of all natural water bodies.

Wetland A pond that has a high proportion of emergent vegetation in relation to open water that provides a variety of habitats.

Windfall Sites Sites which become available for development unexpectedly and are therefore not included as allocated land in a planning authority’s development plan. Abbreviations/Acronyms

AAP Area Action Plan AMP Asset Management Plan AONB Area of Outstanding Natural Beauty CFMP Catchment flood management plan CIRIA Construction Industry Research Information Association CLG Communities and Local Government DEFRA Department for Environment, Food and Rural Affairs DETR Department for Environment, Transport and the Regions EA Environment Agency EFRA Exceedence flood risk assessment EIP Examination in Public FCDPAG Flood and coastal defence project appraisal guidance FRASite-specific Flood Risk Assessment FRSA Flood Risk Standing Advice FRMS Flood risk management strategy GDPO1995 Town and Country Planning (General Development Procedures) Order 1995 GIS Geographical Information System HLT High Level Target IDB Internal Drainage Board IPCC Intergovernmental panel on climate change IUD Integrated Urban Drainage IUDM Integrated Urban Drainage Management LDD Local development document LPA Local Planning Authority NAFRA National Flood Risk Assessment NFCDD National Flood and Coastal Defence Database NSWG National SUDs Working Group ODPM Office of the Deputy Prime Minister OFWATWater Services Regulation Authority PPG Planning Policy Guidance Note PPS Planning Policy Statement PCPA2004 Planning and Compulsory Purchase Act 2004 PINS Planning Inspectorate RBMP River Basin Management Plan RFRA Regional Flood Risk Appraisal (RFRA) RDA Regional Development Agency RPB Regional Planning Body RSS Regional Spatial Strategy SA Sustainability Appraisal SAC Special area for conservation SEAStrategic Environmental Assessment SFRAStrategic Flood Risk Assessment SMP Shoreline Management Plan SPASpecial protection area SPD Supplementary Planning Document SSSI Site of Special Scientific Interest SUDSSustainable Urban Drainage Systems SWMP Surface Water Management Plan TCPA1990 Town and Country Planning Act 1990 UKCIP UK Climate Impact Programme WFD Water Framework Directive