Flood Emergency Plan for a Planning Application: What the Council Wants, and Why "Shelter Upstairs" Alone Gets Refused

A flood emergency plan for a planning application is not a template with the address changed. A council, a Lead Local Flood Authority (LLFA) or the Environment Agency that asks for one checks five things. The first is the warning that sets the plan off and the time it really gives. Then come a route rated for hazard stretch by stretch and a destination outside the flood zones that joins the dry road network. The last two are a refuge for every dwelling and a named person who keeps the plan alive. This guide sets out each check in the officers' own words. It draws on five live and decided applications on which Air & Flood Consultants wrote the plan or the flood evidence, and on officers' comments on AFC's own documents. It also shows why "residents will shelter upstairs" on its own has been refused, and what was accepted instead.

A council comment asking for a flood emergency plan is the place to start. Send it with your drawings and request a fee proposal. The flood evacuation plan service page explains what AFC's plans cover.

When a flood emergency plan is needed

The names vary. Councils ask for a Flood Emergency Plan (FEP), a Flood Warning and Evacuation Plan (FWEP) or a flood evacuation plan. They mean the same document: how the people who will live in or use the building are warned, what they do, where they go and who is responsible.

The national test sits in the Planning Practice Guidance on flood risk and coastal change. Paragraph 043 says: "An emergency plan will be needed wherever emergency flood response is an important component of making a development safe." (Reference ID 7-043-20220825). Paragraph 047 adds that "Access routes should allow occupants to safely access and exit their dwellings in design flood conditions." (Reference ID 7-047-20220825). It also says that "Wherever possible, safe access routes should be provided that are located above design flood levels" and away from flow paths.

In practice a plan is asked for in four situations:

• More vulnerable uses in Flood Zones 2 and 3: new homes, conversions to flats, changes of use to residential. The Exception Test asks for development that is safe for its lifetime, and the plan is part of that proof.

• Minor development under the Environment Agency's standing advice (last updated 28 May 2026). It asks for a safe route of access and escape set above estimated flood levels. Any part of the building with no upper floor needs a refuge above the estimated flood level.

• A Flood Zone 1 site with a flooded access. Surface water is not shown on the flood zones, and a dry plot can still have a lane that floods.

• A planning condition. Many permissions are granted with a condition requiring a plan before occupation.

Some councils go further. Application 25/14248/F is for three homes in Flood Zone 2 on Stillhouse Lane, Bedminster, and is undecided. AFC wrote its flood risk assessment (July 2025). Commenting on that assessment on 27 November 2025, Bristol's Flood Risk Manager wrote: "A detailed Flood Emergency Plan is required, this will need to be approved by the Lead Local Flood Authority and the Emergency Preparedness, Resilience and Response Team." Bristol publishes its own flood emergency plan template for this purpose. The flood evidence a Bristol plan draws on is in the council's Level 1 Strategic Flood Risk Assessment (December 2020) and its Level 2 update.

Leaving the plan out altogether draws an objection. The Environment Agency objected to AFC's own June 2026 flood risk assessment for a replacement dwelling at Poplars, Datchet (Windsor and Maidenhead, 26/01871/FULL, undecided). The case study describes the scheme. One of the Agency's reasons was: "There is no assessment of potential evacuation routes and no formal flood warning and evacuation plan." AFC's addendum (revision 3, 25 October 2026) adds a flood warning and evacuation plan triggered by a Thames river gauge, with a first-floor refuge. It is not yet on the application file.

The national framework for appraising plans is Flood risk emergency plans for new development (September 2019). The Environment Agency and ADEPT wrote it jointly for council planners. Officers use it, or their own local version, as the checklist.

What officers check, item by item

1. The trigger, and the time it really gives

The plan starts with the warning that sets it off. Officers check three things: that the site is actually covered by the warning named, that the lead time stated is the real one for that source, and that each action in the plan fits inside that time.

Template lead times are a frequent fault. A plan for a site on a rapid-response beck cannot carry a lead time of days from another job. Where flooding can arrive within minutes, the plan has to be built on immediate refuge, because there will be no time to walk anywhere.

Where no Environment Agency flood warning covers the site, the plan has to say so and name what replaces it. The Environment Agency does not issue property-level warnings for surface water flooding. On the Glen Villas site in Portreath (Cornwall, PA26/05047) the only risk was surface water on the access lane. AFC's plan used Met Office rain warnings as the trigger and set the decision point by arithmetic. The 586 m lane takes 13 to 15 minutes to walk. A Yellow rain warning gives hours to days of notice, and visible flow in the cutting gives minutes. The Yellow warning was therefore made the last time to travel.

Figure 1: The warning-to-action table from the Glen Villas plan (8 August 2026, p. 8). The Yellow rain warning is the decision point; at Amber or Red the route is not used.

2. The route, rated stretch by stretch

Officers want the hazard to people on the escape route, not a statement that the route is "safe". The rating comes from the Defra and Environment Agency research FD2320 and FD2321, set out in the FD2321 flood risks to people methodology report:

Hazard rating = depth × (velocity + 0.5) + debris factor

with depth in metres and velocity in m/s. Below 0.75 the hazard is very low (caution). From 0.75 to 1.25 it is danger for some (children, the elderly and the infirm); from 1.25 to 2.0 danger for most; above 2.0 danger for all.

A single rating for the whole route is not enough. AFC learned this on the Stillhouse Lane application. On 23 March 2026 Bristol's Flood Risk Manager commented on AFC's revised flood risk assessment and flood warning and evacuation plan of January 2026: "The flood hazard ratings have not been provided for this route and there are potentially dry routes or routes with lesser depths of flooding over shorter distances that have not been considered." Two points come out of that comment. The rating has to be given along the route, and the plan has to show that shorter or drier alternatives were tested and say why they were rejected.

AFC's revision 3 (May 2026) added an FD2320 hazard table for the route. The case officer then asked for more on the route and the refuge (see item 5 below), and AFC is preparing an addendum. The application is undecided.

Some councils set the bar in their Strategic Flood Risk Assessment (SFRA). Runnymede's Drainage engineer quoted the Runnymede SFRA (2018) in an objection of 3 September 2026: "It is considered acceptable for the access/egress route to be wet in Runnymede so long as the flood hazard is no greater than Very Low Hazard– Caution along the full length of the access/escape route. The route should also be along publicly accessible roads or paths." The words "full length" matter. A route that is very low hazard for 90 m and danger for some for 3 m fails that test.

At Glen Villas the route was read every 2 m along its centreline from the Environment Agency's surface water hazard products. Of the 586 m lane, 320 m lies within mapped surface water extents. Danger for some (a rating of 0.75 or more) reached Medium likelihood over a single 2 m stretch between chainage 335 and 345 m, rising to High likelihood with climate change. Danger for most was reached only at Low likelihood with climate change, as residual risk.

Figure 2: Glen Villas, hazard rating 0.75 or more with climate change along the chainaged route (plan p. 10). Contains Environment Agency information © Crown copyright; basemap © OpenStreetMap contributors.

Figure 3: The same route as a long section, with the three affected reaches (plan p. 11). The development parcel sits outside every mapped surface water extent.

3. The destination: outside the flood zones and joined to the dry road network

The route has to end somewhere that stays dry and stays reachable. AFC's rule is that the destination lies outside Flood Zones 2 and 3. From there it must continue, without crossing them again, to the road network the emergency services use. A dry patch enclosed by Flood Zone 2 or 3 is a dry island. People who gather there are cut off as the water rises, and a rescue from it is larger, not smaller.

AFC's own plan for Byfleet House, Guildford Road, Chertsey (RU.26/1089) made this mistake. Runnymede's Drainage engineer objected that its route "directs future occupants further towards the flooded area, rather than away from it as the station car park is surrounded by Flood Zones 2 and 3 on all sides". The PPG makes the same point from the emergency services' side: "The emergency services are unlikely to regard developments that increase the scale of any rescue that might be required" as safe (paragraph 044, Reference ID 7-044-20220825).

Figure 4: The dry island trap. Check the destination on a wide flood zone map before adopting the route.

4. The refuge, and why it does not rescue a ground-floor flat

A refuge is a room above the design flood level, reached from inside the dwelling, where people wait if the flood arrives before they can leave. PPG paragraph 047 asks for "an internally accessible place of safety, capable of accommodating the likely number of occupants or users" where flooding could arrive too quickly for escape.

A refuge supports a plan. It does not replace a dry escape for a home that has no upper floor of its own. Bristol refused an earlier application on the Stillhouse Lane site (24/02283/F, 10 September 2024; the flood risk assessment was by another consultant) with reason 1 stating that "the assessment does not contain adequate explanation of how the ground floor flat would have a dry and safe escape route". Some councils reject refuge as the main strategy for any home. Runnymede's Drainage engineer wrote on Byfleet House: "A safe refuge approach as proposed in the updated FRA would not be supported".

What officers look for in a refuge:

• its floor level in mAOD against the design flood level with climate change;

• one for every dwelling, inside that dwelling, not a shared landing two floors up;

• a bathroom, water, food, a torch, a charged phone and a window or other way out;

• how long people might be cut off, and how they manage for that time.

5. Isolation, welfare and emergency access

Officers ask when the flood starts and how long it lasts. They ask how long occupants could be cut off, how they manage during that time and whether the emergency services can reach the building. Where the assembly point itself floods in a future climate change event, that is raised too. The plan should state onset and duration from the flood evidence, a realistic isolation period and the supplies the refuge holds.

6. Barriers, and where they stop working

Demountable door barriers keep shallow water out of an existing building. AFC's revision 3 for Stillhouse Lane (May 2026) relied on 600 mm door barriers where the depth it predicted was greater. On 24 September 2026 Bristol's case officer told the applicant's agent that barriers of this type are generally effective only to about 600 mm, due to water pressure. The officer asked how the property would be protected above that depth. AFC's addendum, now being prepared, answers with a water-entry strategy above 0.6 m.

The Environment Agency's standing advice draws its line at the same depth, as the threshold for structural advice: "If your design aims to keep out a depth of more than 600mm of water, you should get advice from a structural engineer." Above about 600 mm the design has to allow water in. That means resilient finishes, raised services and a ground floor that can be washed down, with sleeping and the refuge upstairs.

The standing advice also states: "Temporary or demountable flood barriers are not appropriate for new buildings." It allows them only for existing buildings, with an appropriate warning or trigger. The flood resistance and resilience measures page sets out the options, and the guide to finished floor levels in Flood Zones 2 and 3 covers what to do when the floor cannot be raised.

Figure 5: Resistance below about 600 mm, resilience above it, and a refuge above the design flood level.

7. Who owns the plan, and what each occupant gets

Officers check that it names one responsible role throughout (the freeholder, a managing agent, the reserve manager) and a deputy for nights and holidays. They check how warnings reach every occupant: each household can register for the Environment Agency's free flood warnings by phone, text or email. They also check how often the plan is reviewed and exercised, and what is handed to each new occupier. The plan must also never tell residents that rescue will come to them. Bristol's template places responsibility for the plan on the applicant and asks for review at least every three years.

Three plans compared

The three plans below are AFC's. One was accepted on flood grounds (Glen Villas). One is awaiting a decision, with the LLFA's comments in (Skinningrove). The third, on a prior approval application, was refused because the council did not accept the route (Byfleet House).

Former chapel, Chapel Street, Skinningrove (Redcar and Cleveland)

Two houses formed in the smaller hall of a former Methodist chapel in Flood Zone 2. Application R/2024/0379/CA was permitted on 9 January 2025 with condition 4: "Prior to the occupation of the residential units hereby approved a flood evacuation plan shall be submitted to and approved in writing by the Local Planning Authority." AFC wrote the plan for that condition (19 June 2026), and it was submitted under R/2026/0449/CD, which is undecided at the time of writing.

The plan uses Environment Agency 2D model outputs for the 1 in 100-year event plus climate change: a peak depth of 0.45 m and velocity of 0.25 m/s immediately outside the site. The route is set out in three segments to an assembly point about a 2-minute walk away. By the formula in item 2, with the urban debris factor of 1.0 above 0.25 m depth, the first 30 m rates 1.34, danger for most. The 30 to 60 m segment (0.2 m, 0.1 m/s) rates 0.62 at most, and 60 to 120 m less than that: both very low hazard (Figure 6). The plan's own table rates the 30 to 60 m segment as danger for some, which overstates the hazard there and does not match the FD2320 matrix reproduced on the same page.

The plan describes the first-floor refuge in each house as "the primary protection for occupants in the event of a no-notice or rapid-onset event". It adds demountable door barriers rated to 600 mm, Floodline registration with a deputy contact for 24-hour cover, a register of residents needing help, and an annual review and exercise.

The LLFA commented on the plan on 16 July 2026 without objecting: "the Plan appears to set out the relevant flood warning arrangements, emergency contacts and refuge procedures." It limited its scope to those items because the principle of the homes was already approved, and added: "Our review should not be taken as confirmation that the level of flood risk is acceptable or that the effectiveness of the proposed evacuation and refuge measures can be guaranteed during all flood events." The discharge of the condition is undecided.

The plan as submitted also carries three of the traps listed later in this guide: two different warning times, two different responsible parties, and street names carried over from AFC's Bristol job. More on the job is in the Skinningrove case study.

Figure 6: The Skinningrove route, segment by segment, rated by the FD2320 formula from the depths and velocities in the plan's route table (p. 5).

Land east of Glen Villas, The Incline, Portreath (Cornwall)

A Permission in Principle application (PA26/05047) for two to four homes on a hillside parcel in Flood Zone 1, reached only by a 586 m private lane rising 50.37 m. The council's first comment was that the sole access route was at risk of surface water flooding with climate change. Safe access and egress therefore had to be shown in a site-specific flood risk assessment, even though the parcel is in Flood Zone 1.

AFC's plan (8 August 2026) sets shelter in place as the strategy. The parcel stands between 35.10 and 47.56 mAOD and lies outside every mapped surface water extent, present day and with climate change, so the homes themselves are the place of safety. The lane is read every 2 m (Figures 2 and 3), the Yellow rain warning is the last time to travel (Figure 1), and the plan is reviewed at least every three years.

The officer accepted the flood case: "it is considered that there are mitigation measures that would ensure the safety of the occupants." The application was refused on 4 September 2026 for reasons unrelated to flooding: its location in open countryside and its effect on the landscape.

Byfleet House, Guildford Road, Chertsey (Runnymede)

A prior approval application (RU.26/1089) to convert offices in Flood Zone 3 into nine flats. AFC wrote the flood risk assessment, a site-specific flood modelling addendum and the flood emergency plan. The plan set evacuation before onset, on a Flood Warning for the adjacent Chertsey Bourne warning areas. The route was a 97 m walk to the southern end of Chertsey station car park, with a first-floor refuge as the fallback. The plan assessed the route by a still-water fluvial check on LiDAR and by the Environment Agency's surface water hazard products. It found the worst design-case hazard very low.

Runnymede's Drainage engineer objected on 3 September 2026. The route led to a car park surrounded by Flood Zones 2 and 3. The assessment showed hazard above "Very Low Hazard – Caution" outside the building in the design flood with climate change. Refuge was not accepted. The Environment Agency had objected on 2 September 2026 because AFC's base flood risk assessment was not on the prior approval file. The plan and the modelling addendum both referred to it, but the Agency found no copy among the application documents. Prior approval was refused on 21 September 2026 because the documents "fail to demonstrate a safe access and egress route required for the safety of future occupants." The decision can be appealed until March 2027.

AFC draws two lessons for Runnymede. The first comes from its Local Plan policy EE13 and the SFRA. Before taking on a conversion in Flood Zone 3 there, first map the walking route to land wholly outside the flood extent, at very low hazard over its full length. The second is that every document a plan relies on has to be on the application file, the flood risk assessment above all. The Chertsey case study describes the job. The guide to flood risk assessment in Windsor and Maidenhead covers a neighbouring borough with similar Thames-side constraints.

Figure 7: The Byfleet House route (plan p. 9). The council objected that the car park is surrounded by Flood Zones 2 and 3. Contains Environment Agency information © Environment Agency; basemap © OpenStreetMap contributors.

The traps

Template lead times. A lead time copied from another job, or a service-wide figure, put on a site where the river responds in minutes. AFC's Skinningrove plan gives a 15-minute figure on page 2 and an EA lead time of 5 days on page 3. State the real warning time for the source that floods the site, and build the actions around it.

One hazard rating for the whole route. A single "low hazard" statement. Officers want depth, velocity, debris factor and rating along the route, with the worst stretch named.

A debris factor of zero for still water. With the debris factor set to zero, water 0.8 m deep and still gives a rating of 0.4, which reads as very low hazard. With the FD2320 urban debris factor of 1.0 above 0.25 m depth, the same water rates 1.4, danger for most. AFC's own review caught this in a draft plan before it was submitted. The Environment Agency's national surface water hazard mapping applies a debris factor of 0.5 up to 0.25 m depth and 1.0 above. A hand calculation with zero will not match the mapping the officer has in front of them.

A refuge instead of a dry escape for a ground-floor flat. Bristol's 2024 refusal on Stillhouse Lane rests on this. A flat with no upper floor of its own needs a route, not a landing.

A destination inside the flood zones. The nearest dry ground is often a dry island. Check the destination on a wide map, and say in the plan why nearer candidates were rejected.

Claiming layout changes before they are drawn. A plan that relies on bedrooms moved upstairs, a new rear exit or a raised threshold must match the drawings on the application file. Officers compare the two. AFC's January 2026 flood risk assessment for Stillhouse Lane concluded that all habitable rooms had moved above the ground floor. Bristol's Flood Risk Manager noted that "no revised plans have been provided and the main kitchen/living areas are proposed on the ground floor." AFC's revision 3 (May 2026) went in with the architect's revised plans, which put every bedroom upstairs.

Template text from another site. A street name, a flood zone or a responsible party left over from another job undermines the whole plan. Runnymede objected to an earlier AFC flood risk assessment for Byfleet House because one page still said Flood Zone 1 while the rest said Flood Zone 3. AFC's Skinningrove plan names "Stillhouse Lane" and "Boot Lane", streets in Bristol, in its route table. It also gives responsibility to "future homeowners" in some paragraphs and to "the landlord" in others, which leaves the officer unsure who acts.

What to submit

Figure 8: The contents of a flood emergency plan that an officer can approve.

A plan that answers each officer's check above contains:

• the flood sources, the design event and its climate change allowance, and the onset and duration of flooding at the site;

• the warning service and the named alert or warning area, or the substitute trigger where none exists, with the real lead time;

• an action table for Flood Alert, Flood Warning and Severe Flood Warning, including the last safe time to travel;

• a route map with hazard bands, a table of depth, velocity, debris factor and rating along the route, and the alternatives tested;

• the destination, shown on the current flood zones, and how it connects to the dry road network;

• the refuge level in mAOD against the design flood level, its facilities and the expected isolation time;

• arrangements for people with mobility or sensory needs and for ground-floor bedrooms at night;

• the barrier height against the depth at the door, and the resilience measures above it;

• the responsible role, a deputy, how the plan reaches each occupant, and the review cycle;

• a one-page flood information sheet for display in each home or the entrance;

• the flood risk assessment it accompanies, on the same application file.

For a site in the flood zones, the plan travels with the flood risk assessment, and the officer reads the two together. The flood zones explainer sets out what each zone means for the application.

FAQ

What should a flood emergency plan include for a planning application?

It covers the flood sources and design event, the warning that triggers the plan and its real lead time, and the actions at each warning stage. It needs an escape route rated for hazard along its length and a destination outside the flood zones. It also needs a refuge above the design flood level, arrangements for people who need help, and a named person responsible for keeping and reviewing it. The checklist in the What to Submit section lists each item.

What is the difference between a flood warning and evacuation plan and a flood emergency plan?

For a planning application there is no practical difference. Councils use Flood Emergency Plan, Flood Warning and Evacuation Plan and flood evacuation plan for the same document. Use the name the council's comment or condition uses, and follow any local template, such as Bristol's.

Can I just say residents will shelter upstairs?

Not on its own. National guidance asks for a refuge where flooding could arrive too quickly to leave, alongside a safe route and a trigger for leaving early. A refuge is not accepted in place of a dry escape for a ground-floor flat, which Bristol refused in 2024. Some councils, including Runnymede, do not accept refuge as the strategy at all. Staying at home was accepted at Glen Villas because the plot itself lies outside every mapped flood extent.

Does the evacuation route have to be completely dry?

Not always. National guidance asks for routes above design flood levels wherever possible. Runnymede's SFRA accepts a wet route if the hazard is no greater than "Very Low Hazard– Caution" along its full length. Cornwall accepted a route with danger for some over a single 2 m stretch because the plan kept people off the route during an event. Check the local SFRA first.

Who approves a flood emergency plan?

The local planning authority decides, usually on advice from its flood or drainage officer, the LLFA, the Environment Agency and the council's emergency planners. Bristol's Flood Risk Manager has asked for plans to be approved by the LLFA and the Emergency Preparedness, Resilience and Response Team. Where a plan is required by condition, the council approves it through a discharge of condition application.

How often does a flood evacuation plan need to be reviewed?

Bristol's template asks for review at least every three years, and sooner after an activation or exercise, a change of ownership or a change to the flood risk or the Environment Agency's warnings. AFC's plans follow that cycle: the Glen Villas plan is reviewed at least every three years, and the Skinningrove plan sets an annual review and exercise as well, plus a review after any flood or any change to the mapping.

Can a flood emergency plan be dealt with by a planning condition?

Often, yes. The PPG says councils should secure agreed plans through conditions or planning agreements, and Redcar and Cleveland conditioned the Skinningrove plan before occupation. A condition cannot cure a site with no safe route, though. Where the route or the destination fails, the application is refused, as at Byfleet House, so the route has to be shown before the decision.

Ask for a flood emergency plan

Send the council's comment, the condition wording or the Environment Agency's letter with your drawings. AFC will set out what the plan for your site must cover and what evidence it needs. Request a fee proposal through the website form.