Consider the risks to your own business as well as to your operations

Transcription

1 Hayley Bowman Flood and Coastal Risk Management Mapping, Modelling and Data EA covers England only. Wales covered by Natural Resources Wales. Scotland by SEPA. 15,000 employees 600 branches Consider the risks to your own business as well as to your operations 1

2 Variety of different flood sources EA river / sea Lead Local Flood Authority EA has some Surface Water information as it has a Strategic Overview role in England 2

3 So who are the Environment Agency? We are a government agency in England. We work to create better places for people and wildlife, and support sustainable development. We have a central role in delivering the environmental priorities of central government through our functions and roles. Our 3 main business areas are: flood and coastal risk management; water, land and biodiversity; and regulated business. We ensure that we consider the impacts of CC through our work to manage flood risk and coastal erosion, safeguard water resources and protect the water and wetland environment We take this challenge seriously and have responded to it for a number of years. For example we; have factored CC into our plans, strategies and capital investments in flood for over a decade, provide advice to local planning authorities on future flooding to support their local plans and development decisions, work to balance the water needs of people, businesses, farmers and the environment both now and in the future The Thames Estuary 2100 project (TE2100) pioneered a flexible approach to planning and climate risks in developing a flood risk management plan to the end of the century. 3

4 We have been modelling, mapping and managing flood risk for many years We respond to flooding We work with other agency s and organisations to raise awareness and help them plan to manage risk better We comment on development proposals We provide data to a host of organisations and to the public 4

5 We model and map flood risk in a strategic way Planning where we need more data, for example where there is high development pressure or in urban areas We invest approximately 17 million per year in modelling and mapping and an additional 15 million in gathering and processing data to support flood and coastal risk management. This data, modelling and mapping underpins all the decisions we make in Flood and Coastal Risk Management, including significant investment decisions. We have systems in place to manage our data controlling how we store it, data standards, maturity etc and operate a custodianship model to help us achieve this 5

6 Variety of different flood sources EA river / sea Lead Local Flood Authority EA has some Surface Water information as it has a Strategic Overview role in England 6

7 Property conveyancing 800,000 reports to solicitors The public taking action to protect themselves and their property App developers such as Halcrows flood alert I phone app Developers determining where to build and where not to Consultants creating their own mapping Insurers Emergency services National Infrastructure, travel and utility networks looking to engage more with these sectors and provide data to help inform and build resilience 7

8 We are engaging with may different organisations to raise their awareness of our data and get them to include it in their decision making These are just a few Our vision is that our data is used by everyone in their decisions and that the public s awareness of flood risk is raised by all the organisations they deal with using our data and understanding flood risk and what can be done to manage it 8

9 We are not allowed to offer a bespoke service to customers This is for a number of reasons including concerns about state aid and competition law We can offer our data, produced over many years by staff with years of local knowledge and experience, and provide this for a specific location, if the concern is to understand the risk of flooding in areas where specific properties or buildings are located. We can offer advice on how to use our data We are open and transparent about the strengths and limitations of our data 9

10 You can find your local EA office here: Ask for customer engagement teams Request a product 4 for a specific postcode. Cost is 50 per report. 10

11 You can find your local EA office here: Ask for customer engagement teams Request an Insurance Related Request report for a specific postcode. Cost is 50 per report. 11

12 We model and map the risk to land, not to property There are a number of reasons for this, the main one being that we do not have a dataset of doorstep or threshold levels for properties across the country We do not believe anyone else has this either To be a truely property specific risk assessment these levels are needed We can produce water levels with a target accuracy of +/- 250mm But we dont have doorstep levels 12

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14 This is the last time the Thames flooded in 1928 We gather a variety of info during a flood Often involving the public afterwards to QA our records We aim to get all new historic info included in our flood records within 3 months of the flood ending Constantly updating our information We hold extensive records of historic floods which we make available either individually, or showing the combined worst case as part of the Historic Flood Map. Historic Flood Map biggest ever extent = 11,437 records Historic Flood Event Outlines individual polygons. - 22,000 records ,000 + properties flooded, smaller geographic areas, Hull, Tewkesbury smaller number but larger number of communities affected 2013/14 around

15 We ve been publishing flood maps since 2000 and it s our main way of communicating risk to the public. Our main product is called Risk of Flooding from Rivers and the Sea, which is a national assessment of flood risk across England. The same assessment is also available for Wales and can be licensed from NRW. Since Dec 14 it is Open Data free of charge and accessed through the DataShare (GeoStore) website. It shows the probability of flooding from rivers and the sea, considering the location, type and condition of defences and maps these on a 50m x 50m grid in four probability bandings: High: each year, there is a chance of flooding of greater than 1 in 30 (3.3%). Medium: each year, there is a chance of flooding of between 1 in 30 (3.3%) and 1 in 100 (1%). Low: each year, there is a chance of flooding of between 1 in 100 (1%) and 1 in 1000 (0.1%). Very Low: each year, there is a chance of flooding of less than 1 in 1000 (0.1%). Properties where the likelihood of flooding is greater than or equal to 1 in 75 (1.3%) in each year are also identified This shows the GIS version of the dataset which is on.gov.uk website and the map the public use to understand the risk where they live. There are two other versions which are in database form which link OS address data and royal mail data to the likelihood data to give a risk category of every property in the floodplain, and every postcode unit based on the likelihood of the cell the property is within. We also calculate reliability information based on how good the data is going into the model, and how well the model performs, and have a record for every cell in the final data which shows at which spatial scale the data is most reliable at; National-County, County-Town, Town-Street, Parcels of Land, Property. Most is currently County to Town but we are making several improvements in 2015 to improve this (Data due for release early in 2016). Indicates where results are most / least reliable & should be used on it s own / combined with other data to verify it. We use it to better plan and prepare to protect more people and property for flood and coastal erosion risk by informing how Flood Defence Grant in Aid is allocated every year. 15

16 Flood Map for Planning shows the areas of land that would be expected to flood from rivers and the sea It shows 2 different flood likelihoods ignoring the impact of flood defences shows the undefended floodplain, or worst case scenario. It is used primarily for land use planning and for raising awareness. It also shows the areas of land that would be protected by defences (1:100 SoP Fluvial / 1:200 SoP Tidal). Its produced from detailed local models produced by our local teams and infilled with a national model. Where a historic event is bigger than the predicted (modelled) extent then we can include this too. Can help you understand the worst case risk in an area and for understanding areas that would be at risk if defences were to fail / be overtopped 16

17 More detailed local data is available in the higher risk areas from scheme design models or detailed modelling for understanding risk better. Where available the data is fed into the national products, but is also available on their own: Water levels at different flood magnitudes Extents of flooding at different flood magnitudes Scenario modelling climate change, blockage, with and without defences, maintenance. Not open data and not on DataShare available through contacting Data Info or direct to local offices. Nationally around 1600 models available 17

18 We are on track to reduce flood and coastal erosion risk to 300,000 households between 2015 and 2021 New flood defence data feeds into our risk modeling Our local staff survey the defences in their area at a frequency determined by the defence type, for example surveying a grass embankment more often than a concrete wall to ensure that the local landowner has not lowered the crest level The dataset we have available contains details such as standard of protection, condition grade, and crest levels of over 175,000 defences Defence details are usually used to feed into modeling of flood risk, and its important that models are updated as soon as possible to reflect the changes in condition or new defences 18

19 To help customers understand where we plan to work we have a dataset of where our local teams plan to construct new defences. This covers a 5 year period and is effectively updated annually by our local teams It shows spatially where we plan to invest 100k or more to change or sustain the current standard of protection offered to an area It does not directly indicate the likelihood of flooding to individual properties. It also includes the equivalent schemes for all Local Authority and Internal Drainage Boards and details the number of households and areas of land contributing to DEFRA s Outcome Measures are also attributed i.e. could benefit from major work on flood defences. Currently have the TE2100 plan looking at the future of the Thames Barrier and defences to London over the next 100 years, and Lower Thames Scheme Datchet to Teddington which will provide defences to the non tidal Thames, especially around the communities hit hard this Winter, Staines, Egham, Windsor and Datchet. 19

20 We survey the ground to use the levels to feed into our modelling using our 2 LIDAR planes Explain LIDAR We also use planes and satellite imagery to capture flood extents 20

21 In December 2013 we published surface water maps for the first time Risk shown in four probability bandings: High (1 in 30 probability or greater) Medium (between 1 in 30 and 1 in 100 probability) Low (less than 1 in 100 probability). Very Low The national scale model uses a detailed model of the ground to see where rain water flows and ponds, taking account of a range of storm durations, infiltration into the ground, hydraulics, and, in broad terms, subsurface drainage. Lead Local Flood Authorities (LLFAs), who are responsible for surface water flooding, have provided compatible detailed surface water mapping where this is available and where it is more representative, and this replaces the national scale mapping in these locations. A suitability rating has been assigned based on the applicability of the model, the input data quality and, where available, an LLFA review of the maps against recorded or known flood risk. Understanding all sources of flood risk is key and this new data with its LLFA input is an important dataset to aid that understanding CLICK this is the direction map we also have velocity and depth. 21

22 CLICK this is the direction map we also have velocity and depth. 22

23 These warnings are communicated to those living in at risk areas by phone, text or e mail and also through the internet and the media. Warning status is updated every 15mins and available as an XML feed 23

24 We make our national datasets available through a web download service called DataShare. Quarterly updates are available for lots of our datasets On this data is pre-cut to users operational areas and we have over 2000 active users. Accessing flood data through the site speeds up the time it takes to obtain the data, it can be incorporated into systems as soon as possible. Users are notified when new data is available to download We have almost 5000 registered users downloading from 28 different datasets 24

25 Recent commitment to publish as much of our data as possible as Open Data Coastal: GIS dataset and supporting information providing design / extreme sea level and typical surge information around the coastline of England and Wales under present day conditions 25

26 Flood Alert Area is generally a large expanse of floodplain (up to and including the extreme flood outline which defines the Flood Warning Service Limit), within a catchment, subcatchment or group of catchments, that is/are at risk from low impact flooding (from main rivers, ordinary watercourses and the sea). Flood Warning Areas Locations within the Flood Warning Service Limit (FWSL) that represent a single or aggregation of Flood Warning Sub Areas (FWSAs) or Flood Warning Flood Risk Areas (FWFRAs) containing a discrete community at risk of flooding. Flood Risk Areas have been defined by Lead Local Flood Authorities, based on combining risk to people, critical services and commercial and public assets, and detailed flood modelling. These areas cover surface water flooding only. RoFRS: Previously known as NaFRA Spatial Flood Likelihood Category Grid. This national assessment of flood risk for England shows the chance of flooding from rivers and/or the sea, based on cells of 50m. Each cell is allocated one of four flood risk categories, taking into account flood defences and their condition. 26

27 HFM: The maximum extent of all recorded individual historic flood event outlines from rivers, the sea and groundwater springs in England & Wales Recorded Flood Outlines contains the individual records of historic flooding. These records show flooding to the land and do not necessarily indicate that properties were flooded internally. Absence of a flood event does not mean that the area has never flooded, only that we do not currently have records of flooding in this area. 27

28 We charge for commercial re-use of our information Each dataset has a national charge Discounts are available where the data is used on less than 100 terminals Example shows Flood Map for Planning (ref Slide 6). 14,000 (plus 3 rd party) pa for England dataset full corporate use. 1,925 for England dataset single terminal use. 28

29 We charge for commercial re-use of our information Each dataset has a national charge Discounts are available where the data is used on less than 100 terminals Example shows Flood Map for Planning (ref Slide 6). 14,000 (plus 3 rd party) pa for England dataset full corporate use. 1,925 for England dataset single terminal use. 29

30 Most 1/4ly updated best to review the flood risk information for specific locations at least once a year. Community input We build the defences and update to include them Public facing web, media, weather reports In -expensive Local expert input Unique local input and expertise. We gather the historic data. We survey and build the defences. We provide the flood warning service. 30

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32 We have samples available of all of our data We would be happy to meet to discuss further 32