What an Environment Agency consultee rejects in an FRA

Most flood risk assessment objection reasons are procedural rather than technical. The Environment Agency's consultation response on a planning application is produced by an officer working to a defined remit and a tight deadline, and where the assessment does not answer the questions in that remit the default output is a holding objection: an objection maintained until the missing information arrives. Understanding what that officer is checking for, and in what order, removes most of the risk before the application is submitted.

How the consultation response is produced

The Agency is a statutory consultee on applications for development in Flood Zones 2 and 3, other than minor development, and on a defined list of other matters. It publishes standing advice for the smaller cases, which means a proportion of applications never reach a human at all and are answered by the authority applying that advice.

Where a response is produced, the officer works from a checklist derived from national policy and the Agency's own remit. Fluvial and tidal flood risk, the effect of the development on flood risk elsewhere, and matters such as groundwater protection and contaminated land where those are engaged. Surface water drainage is generally not theirs, because the lead local flood authority is the statutory consultee for that on major applications, and confusing the two produces a document that neither consultee can use.

The response comes back as no objection, no objection subject to conditions, an objection in principle, or a holding objection. The last is by far the most common, and it usually means the assessment did not contain something the officer needed rather than that the development is unacceptable.

Outdated climate change allowances

This is the single most frequent reason for an objection, and it is entirely avoidable.

The Agency publishes peak river flow and peak rainfall allowances, expressed as percentage uplifts that vary by river basin district and management catchment, by epoch and by allowance category. They have been revised more than once, and an assessment quoting a figure from an older version will be rejected regardless of how good the rest of it is.

Two further errors compound it. Applying the wrong allowance category for the vulnerability of the development and the flood zone, where the guidance directs which to use. And applying the allowance over the wrong lifetime: residential development is normally assessed to 2115 or later, while commercial development is commonly assessed over a shorter period, and the epoch chosen has to match.

Quote the allowance, the catchment, the epoch and the version of the guidance you took it from, with the date you accessed it. An officer who can see the derivation rarely queries it.

Missing sequential and exception test evidence

The sequential test is the local authority's to apply, and the applicant has to supply the evidence for it. Where a more vulnerable use is proposed in Flood Zone 2 or 3 and the assessment says nothing about alternative sites, the objection writes itself.

Set out the geographical area of search and why it is the right one, the source of the sites considered, usually the council's own strategic housing land availability assessment or brownfield register, and the reason each was discounted. Discounting sites because the applicant does not own them is not a reason that will survive.

The exception test then has two limbs: wider sustainability benefits that outweigh the flood risk, and a demonstration that the development will be safe for its lifetime without increasing risk elsewhere. Assessments routinely address the second and forget the first. Both have to be evidenced, and the benefits limb belongs in the planning statement with a cross reference rather than being asserted in a technical appendix.

Floor levels without a survey datum

Levels quoted as a height above existing ground level are useless to a flood risk officer. Everything has to be expressed in metres above Ordnance Datum and tied to a topographic survey.

The chain the officer looks for runs through four steps. The modelled flood level for the design event including climate change, in metres above datum. Existing site levels from a survey, in the same units. Proposed finished floor levels, again in the same units. And the freeboard between the design level and the floor level, stated as a figure.

Where the modelled level comes from the Agency's own data, say which product was requested and when. Where it comes from a site specific hydraulic model, state the model, the version, who ran it and whether the Agency has seen it. An assessment that gives a flood level with no provenance will be queried even if the number is right.

Missing topographic survey is the related failing. A site described as generally level, with no spot heights, gives the officer nothing to check against, and on a sloping site it is a real technical gap rather than a formality.

Safe access and egress left unassessed

Safe access is a separate test from property protection and it is frequently skipped. A building with a raised floor level can still be unacceptable if residents have to wade to reach it.

Assess the route from the building to a place of safety outside the flood extent. Give the depth and velocity along the route for the design event, apply a recognised hazard rating, and say whether the route is dry, safe but wet, or unsafe. Where the route is not dry, explain what compensates: a refuge above the design level, a flood warning lead time, an evacuation plan with a named responsible party.

Emergency vehicle access matters too on larger schemes, and the local emergency planning officer is often consulted separately. Where a scheme depends on people staying put, say so and show that the refuge is adequate for the duration of the event rather than for the peak hour alone.

Drainage proposals that assume infiltration

Where the assessment also covers surface water, the recurring failing is a drainage strategy that assumes infiltration without testing it.

Infiltration rates need field testing to a recognised method, at the depth and location of the proposed feature, with the results reported including the trial pit logs and the groundwater level encountered. Rates taken from a geological map or from a neighbouring site are not evidence. And infiltration is unsuitable, or needs specific justification, where groundwater is shallow, where the ground is contaminated, or where the site sits in a source protection zone, which is exactly where a groundwater objection arises.

Present the discharge hierarchy honestly: infiltration first, then a surface water body, then a surface water sewer, then a combined sewer, with evidence of why each higher option was rejected. Where a connection to a public sewer is proposed, the undertaker's position is needed, and the process for obtaining it is much the same as the enquiry described in the note on the sewer capacity enquiry in a foul sewage assessment.

Responding to a holding objection

Do not resubmit a lightly edited report. Deal with the objection as a set of questions and answer each one in a form the officer can check.

1. Read the response line by line and build a response matrix: the point raised, where it is now addressed, and the page reference in the revised assessment.
2. Request the Agency's detailed flood risk data for the site if you do not already hold it, because most level disputes come from working off the published map alone.
3. Commission the survey or the modelling that is missing. A topographic survey takes days, a hydraulic model takes weeks, and knowing which you need determines whether to ask for an extension of time.
4. Send the draft revision to the consultee before formally submitting it. Officers will usually indicate whether it answers the point, and that informal round saves a full consultation cycle.
5. Agree an extension of time with the case officer so the application is not refused while the work is done.
6. Ask for the objection to be formally withdrawn in writing, and make sure the case officer has that letter on the file before the report is written.

An objection withdrawn is worth far more than an objection argued against. Where the Agency maintains its position on substance rather than on information, the honest advice is usually to change the scheme, because a recommendation to refuse supported by a statutory consultee objection is a difficult appeal.

PlanScope drafts flood risk and drainage documents from your site details and the Environment Agency data it checks automatically, flagging every figure that has to come from a survey or a model. Browse the report types index to see the set, or enter your postcode to check what a site in a flood zone is likely to need.

This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.