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Linked 1D − 2D river
model, River Pelenna

This study was carried out to assess the flood risk to a proposed development of three detached houses on the site of a former HGV garage situated close to the River Pelenna to the east of Neath in south Wales. This was done in the context of TAN15, the Welsh Government's document governing new development and flood risk.


Expert Witness, flooding from highway drain

One of our senior staff acted as an expert witness in a court case regarding a complex flooding problem in southern England. This involved producing a comprehensive expert witness report and later being cross-examined in court. The flooding affected the highway and a residential property, the latter being flooded internally on occasion.

The terms of reference involved assessing the suitability of an existing Micro Drainage computer model of the drainage system and examining the...



1D river modelling study, Ffrwd Wyllt watercourse, Bryn, Port Talbot

Bryn is a small village about 6km to the north-east of Port Talbot in south Wales. Morton-Roberts carried out a river modelling study on the Ffrwd Wyllt at Bryn to investigate if three proposed residential properties would be acceptable given the criteria set out in TAN15, the Welsh Government's guidance on developments and flood risk. The project as a whole incorporated a Flood Estimation Handbook (FEH) study of the catchment and 1D river modelling work using...


Photograph: Lower culvert

Off-site surface water sewer design for residential development, Herefordshire

Morton-Roberts was engaged to design a suitable surface water sewer to act as an outfall for this 30 house development site located adjacent to a main road in a small village in Herefordshire. ...

Numerous options to drain the surface water from the site were investigated and most of these involved draining into the culverted watercourse...Various routes for the off-site surface water sewer were investigated including along the main road and also via fields...


Photograph - Sewer under construction

Expert Witness, flooding from culverted Watercourse

One of our senior staff acted as an expert witness in a case involving flooding from a small culverted watercourse in southern England. A blockage had formed in the culvert which resulted in extensive flooding to two properties during a period of high flows caused by melting snow combined with heavy rainfall.

Our expert witness provided opinion on the obligations of the various parties, the speed of occurrence of the flooding, the reasonable steps which one of the parties could have taken prior...


Culvert inlet

Watercourse study for redevelopment site, Cwmbach

Morton-Roberts were engaged to assess if it was possible to drain the attenuated surface water flows from a proposed development into a small local watercourse. Part of an existing housing estate in Cwmbach was being redeveloped with some 37 new residential properties replacing the existing. The old development drained to the combined sewerage system but the new houses were required to drain to the local watercourse.

It was planned that the flow from the new development would...


Screen upstream of culvert
River Pelenna near site

Drainage Strategy Report and surface water (SUDS) design

Morton-Roberts produced a design for the surface water drainage for a development comprising 18 new and converted residential properties on a brown field site within a Herefordshire village. The site was formerly occupied by farm buildings...


Barns before redevelopment

Flood Consequence Assessment, Powys

Morton-Roberts produced a Flood Consequence Assessment (FCA) to TAN15 to support a planning application for the construction of a new building near the confluence...

Morton-Roberts carried out a hydrological assessment of the flows in both watercourses using Flood Estimation Handbook...


Bridge over watercourse

Surface water (SUDS) design for development, Monmouthshire

Morton-Roberts were engaged to produced a design to dispose of the surface water from this small 'green field' residential development, comprising 5 properties, which was on the edge of a village in Monmouthshire.


Photograph - Site

Counters Creek Flooding Scheme

One of our senior staff was seconded to Thames Water's Counters Creek team in Paddington, London during 2012 to assist in the preparation of outline sewerage designs. These were intended to address extensive property flooding in the Shepherd's Bush, Hammersmith, Fulham, Chelsea...


Lots Road Pumping Station

Flood Risk Assessment,

Morton-Roberts produced a Flood Risk Assessment for a 3ha greenfield site close to the River Frome in Somerset which the Client wanted to develop for residential purposes. The study examined the risk of flooding from various sources including fluvial (river), surface water, ground water, sewers...


River Frome near the study site

Drainage for new development

Morton-Roberts secured approval for the disposal of surface water from a new residential development on the site of a previously demolished property. This proved to be extremely challenging since Dwr Cymru Welsh Water (DCWW) had imposed a moratorium on further surface water being discharged...


Old quarry located close to development

Flooding advice for financial services company

Morton-Roberts provided advice to a financial services company regarding a flooding problem which affected their head office located in south west England. The lower floor of the office had flooded during the summer storms of 2007 and the company was anxious to ensure that it was suitably protected against future floods.



Drainage for New Developments

Expert Witness

Flood Risk Assessments

Flood Consequence Assessments


River Modelling

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