Flood Risk and Drainage Assessment Hillingdon

Flood Risk Assessment and Drainage Assessment in Hillingdon

If you need a flood risk assessment or a drainage assessment for any kind of property or development within the Borough of Hillingdon then get in touch with our experienced team today.

Fill out the form on the right, call 01293 214444 or contact us.

Obtaining Planning Permission in the London Borough of Hillingdon.

If you are looking to obtain planning permission within the London Borough of Hillingdon for either an simple extension, Change of Use, new build or a Major Development and find your planning application cannot be validated until you submit a Flood Risk Assessment or Surface Water Drainage Strategy for your proposed development, Unda can help.

We will establish whether you site is located within an Environment Agency Flood Zone and / or one of the Councils designated Critical Drainage Areas and provide a tailored report which addresses National and Local planning policies.

Within the London Borough of Hillingdon, drainage is now a material planning consideration for the Local Planning Authority for all Major applications (either new or for redevelopments) and for all minor applications and householder development.

Any application needs to ensure that surface water run off is controlled ensuring the proposed development does not increase the risk of flooding contrary to Policies:

  • Policy EM6 Flood Risk Management in Hillingdon Local Plan: Part 1- Strategic Policies (Nov 2012)
  • Policy DME 10 Water Management
  • Efficiency and Quality in emerging Hillingdon Local Plan Part 2 Development Management Policies
  • Policy 5.12 Flood Risk Management of the London Plan (March 2016)
  • To be handled as close to its source as possible in compliance with Policy 5.13 Sustainable Drainage of the London Plan (March 2016),
  • Conserve water supplies in accordance with Policy 5.15 Water use and supplies of the London Plan (March 2016).
  • National Planning Policy Framework (March 2012)
  • Planning Practice Guidance (March 2014).


Flood Risk Assessment for Driveways in Hillingdon

Planning permission is required if you intend to cover greater than 5sqm of front or side garden with an impermeable surface (tarmac or concrete) and if water is not collected and directed to a permeable area.  Further details can be found at https://www.hillingdon.gov.uk/article/12578/Sustainable-drainage-requirements-for-planning-applications

Unda has considerable experience in supporting any planning application within the Borough


Flood Risk in the London Borough of Hillingdon

The London Borough of Hillingdon is a large borough located in Greater London, England.  It has approximately 260,000 residents and covers an area of 44 square miles.  Hillingdon his home to Heathrow Airport and is the second largest of the 32 London boroughs by area.

The London Borough of Hillingdon is divided into a total of 22 wards:


  • Barnhill
  • Botwell
  • Brunel
  • Cavendish
  • Charville
  • Eastcote and East Ruislip
  • Harefield
  • Heathrow Villages (including Harmondsworth, Sipson and Harlington)
  • Hillingdon East
  • Ickenham
  • Manor
  • Northwood Hills
  • Northwood
  • Pinkwell
  • South Ruislip
  • Townfield
  • Uxbridge North
  • Uxbridge South
  • West Drayton
  • West Ruislip
  • Yeading
  • Yiewsley

Flood Risk in Hillingdon

Hillingdon Council is susceptible to a number of different sources of flooding, including rivers, surface water, ordinary watercourses, groundwater, reservoirs and sewers.

Within its boundaries lie the River Colne and River Crane catchments, which incorporate the River Pinn and Yeading Brooks, East and West Arm and significant lengths of ordinary watercourses.

The Council has also identified large areas as being at risk from surface water The London Borough of Hillingdon is a land locked Borough with local watercourses affected by  fluvial flood risk.

It is identified that flooding from main rivers could potentially affect over 5,532 (Provided by the Environment Agency in 2016) people in the borough and potentially surface water could affect 29,300 residential properties and 1,300 commercial properties (Data taken from the London Borough of Hillingdon Surface Water Management Plan).

In most cases in Hillingdon flooding is a result of complex interactions between sources.

The local watercourses within the Borough are:-

  1. a) River Colne (including the tributaries of the Frays River and New Years Greene Bourne);
  2. b) River Crane (including the Yeading Brook);
  3. c) River Pinn;
  4. d) Duke of Northumberland River & Longford River;
  5. e) Grand Union Canal;

London Borough of Hillingdon Flood and Water Management

The Flood and Water Management Act 2010 introduced new responsibilities to different bodies in order to help try and clarify who was responsible for different issues.

LBH in its role as Lead Local Flood Authority was given the lead for managing flooding from surface water, groundwater and from ordinary watercourses. It is also required to investigate those sources of flood risk.

Call For Your Free Quote Now

Jackie Stone - Unda Flood Consultant

If you need a quote or to discuss your requirements in more detail contact Jackie Stone, one of our experienced Flood Risk Consultants.

Call 01293 214444


Or Fill Out The Form Below

Main Side Bar Form

Reporting a flood in Hillingdon

The London Borough of Hillingdon is required to undertake investigations on significant flood events under the Flood and Water Management Act and the Flood Risk Regulations.

Should you have any questions please contact the Flooding Team through the Contact Centre on 01895 556000 or send an email to: flooding@hillingdon.gov.uk or alternatively report the flood by using the flood form to report an event.

Alternatively contact the Environment Agency on their 24/7 incident reporting line on 0800 80 70 60. They have officers on standby 24/7 to assess and attend reports of blockages in main rivers. They also carry out practice clearance of specific river control structures and hotspots prior to forecasted heavy rainfall events.



Flood Warning Areas in Hillingdon.

To find out whether your property is at risk of flooding and to sign up to the Environment Agency’s free service by phone 0345 988 1188 or text message.  Click here to sign up online.


Flood Alleviation & Management Scheme’s within the Hillingdon Borough.

Products which have attracted external funding include:

  • River Pinn Flood Alleviation Scheme
  • Park Woods, Ruislip Natural Flood Management Scheme.
  • Cranford Park, Hayes Flood Alleviation Scheme
  • The Common, West Drayton Flood Alleviation Scheme
  • Charville Lane, Hayes Flood Alleviation Scheme


Hillingdon Residents Flood Forum

To find out the details of Future Residential Flood Forum meetings contact flooding@hillingdon.gov.uk.


Environment Agency

Hillingdon is covered by the Environment Agency Customer and Engagement Team for Hertfordshire and North London HNLenquiries@environment-agency.gov.uk. Open Monday to Friday, 8am to 6pm Telephone 03708 506 506.

Historical Flooding in Hillingdon

Key Floods occurred within the borough in:

  • August 1977
  • May 1988
  • December 2013 – Feb 2014
  • June 2014
  • 28th July 2014
  • 26th August 2015
  • 23rd June 2016

When a significant flood occurs within the borough (where properties or business have been flooded internally), as the Lead Local Flood Authority the Council are required to investigate the flooding under Section 19 of the Flood and Water Management Act 2010. The Council have produced 3 Flood Investigation reports todate:

Flood Investigation Report December 2013 – June 2014

Areas affected in Hillingdon include:

  1. a) Spout Lane north
  2. b) The Island, Orchard Court, West Drayton
  3. c) The Common, West Drayton
  4. d) Fairway Avenue, West Drayton and surrounding area
  5. e) St Johns Road and surrounding area
  6. f) Charville Lane, Ullswater and Kendal Closes, Langdale Drive, Hayes
  7. g) Breakspear Road South, Ruislip
  8. h) Ruislip Lido, Ruislip
  9. i) Kings College Playing fields, Ruislip
  10. j) High Road, Eastcote and surrounding area
  11. k) Moorhall Lane, Harefield
  12. l) Summerhall Lane, Harefield
  13. m) Springwell lane, Harefield

Flood Investigation report 28th July 2014

In summary, a large number of roads were temporarily flooded, some of which were impassable as a result, including key infrastructure such as the A40. London Underground train stations and lines were also closed off in the Hillingdon area. In Hillingdon approximately 29 properties flooded internally.  Due to the severity of the flood, some of the residents were placed in temporary accommodation.   Roads affected by this event included:

  • High Road, Eastcote
  • Hill End Road, Harefield
  • Cowley Road, Uxbridge
  • The Lynch, Uxbridge
  • Regents Avenue, Uxbridge
  • Granville Road/ Windsor Avenue , Uxbridge
  • Turnpike Lane, Uxbridge
  • Ruislip Gardens, Ruislip
  • Victoria Road, Ruislip
  • Bedford Road, Ruislip
  • Clyfford Road, Ruislip
  • Lea Crescent, Ruislip
  • Station Approach, Ruislip
  • Westfield Way, Ruislip
  • Cornwall Road, Ruislip
  • Pembroke Road, Ruislip
  • Swakeleys Road, Ickenham
  • Derwent Avenue, Ickenham
  • Thornhill Road, Ickenham
  • St Georges Road, Ickenham
  • Breakspear Road, Ickenham
  • South Parkfield Road, Ickenham
  • High Road, Ickenham
  • Austins Road, Ickenham
  • Glebe Avenue, Ickenham
  • Sussex Road, Ickenham
  • Milverton Drive, Ickenham
  • Edinburgh Road, Ickenham
  • Blossom Road, West Drayton
  • Hatch Lane, West Drayton
  • Money Lane, West Drayton
  • Holloway Lane, Harmondsworth
  • High Street, Harlington
  • Wood End, Hayes
  • Green Road, Hayes
  • Lansbury Drive, Hayes
  • Fairholme Crescent, Hayes


Flood Investigation Report 23 June 2016

During this event Over 63 homes and 25 commercial premises in the Borough are known to have been significantly affected in 36 different locations. Sites of multiple property reports of internal flooding occurred at:

1) Victoria Road, Commercial Premises and Ruislip Manor Station, Ruislip HA4 9A

2) Brook Drive, Brook Close and Evelyn Avenue, Ruislip HA4 8A

3) Broadwood Avenue and Park Avenue, Ruislip HA4 7

4) Wallington Close, Ruislip HA4 7Y

5) Regent Avenue, (Including Long Lane,Windsor Avenue) UB10 9A

6) Alandale Drive, Northwood HA5 3U

7) Sutton Court Road, Uxbridge UB10 9H

8) Field End Road ­ Eastcote High Street, (also includes Hawthorne Avenue) Eastcote HA5 1R

9) Hilliard Road, Hallowell Road, Church Road and Northwood High Street, Northwood HA6 1

10) Kaduna Close and Joel Street, Northwood HA5 2P

11) Church Road, Cowley, Uxbridge UB8

12) Pembroke Road, and Ruislip High Street Ruislip HA4 8N

13) Eastcote Road, Eastcote HA4 8D Eastcote and East Ruislip

14) King Edward’s Road, Ruislip HA4 7A

Places where there are individual reports of internal flooding having occurred:

15) Briarwood Drive, Northwood HA6 1P

16) Chestnut Avenue, Northwood, Hillingdon, HA6 1H

17) Hillside Road, Northwood HA6 1P

18) Cuckoo Hill and Raisins Hill, Pinner HA5 2

19) Kings College Road, Ruislip HA4 7J

20) Meadow Close, Ruislip HA4 8A

21) Northview, Eastcote HA5 1P

22) Fine Bush Lane, Harefield UB9 6L

23) Westcote Rise, Ruislip HA4 7L

24) Sharps Lane, Ruislip HA4 7J

25) Glebe Avenue, Ickenham UB10 8P

26) Campden Road, Ickenham UB10 8E

27) Harefield Road, Uxbridge UB8 1P

28) Southbourne Gardens Ruislip HA4 9T 9

29) Lawn Close, Ruislip HA4 6E

30) Grosvenor Vale, Ruislip HA4 6J

31) Westfield Way at junction Beechwood Avenue, Ruislip, Hillingdon HA4 6H

32) Bury Avenue, Hayes UB4 8L



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