Thursday, 9 June 2016

Flood Risk Assessment - Merton

Flood Risk Assessment - Merton

SWEl have recently prepared a Flood Risk Assessment for an interesting proposed development in Merton (New Maldon).

The development sees the retention of a existing building for conversion under PD rights, and the creation of e neighbouring residential unit.

Below images show various mapping used in the compilation of the report.

Flood Extent Mapping in Merton

Modelled flood data was obtained and used in describing the site as low risk. 

Model Nodes used in 2D Models

Both 1D and 2D flood modelling data was used, the nearest water course was the Beverly Brook. 

A Considerate Design improves Planning Success

The Flood Risk Assessment also considers surface water run-off, thankfully the development was considerately designed with large areas of soft landscaping. 

Flood Risk

Monday, 23 May 2016

Odour Management Plan - Sussex

Odour Management Plan - Sussex

Southwest Environmental Limited have recently prepared an Odour Management Plan for a Nail Bar in Crawley, Sussex. The salon type establishment was sited within a busy shopping precinct. Our client had been requested by his local council to provide an odour management plan.

We were asked to prepare this document on a 3 working day turn around which we were just about able to do. We referenced industry codes of practices and focussed on the main causes of odour such as vapours and dust.

The odour management plan is a working document, and we aim to write such a report as simply as possible, with useful forms and survey checklists included for easy reference.

Odour Management Sussex

Expert Planning Objection - London

Expert Planning Objection - London

Southwest Environmental Limited (Environmental Consultants) were contacted by a residents group, who were trying to contest an application for a school in their neighbourhood. The residents group were concerned about the extra traffic generated by the proposed development and also as to whether the site was indeed suite for the intended use. 

An expert planning objection was prepared by Southwest Environmental we were requested that we limit our comments to those relating to air quality, although we would have happily commented on daylighting, traffic, or noise in this instance. 

The proposed school was situated on a busy junction, which has been subject to monitoring, for nitrogen dioxide. Nitrogen dioxide has been shown to have chronic effects on the health of adults and children alike, although at present the is a great deal of uncertainty regarding safe exposure levels. 

To that end the European Union has set targets of 40ugm3 as an annual mean, and the site exceeds these values. There are have been various studies[1] that point to unsatisfactory air quality in the area, yet reports submitted in support of planning appear to show that this is not the case thus indicating a discrepancy.

In 2014 The European Commission launched legal proceedings against the UK for failing to deal with air pollution. The EU reasoning behind case this was that levels of nitrogen dioxide, mainly from diesel engines, are "excessive" in many British cities. The Commission noted in its written statement at the time that nitrogen dioxide gas can lead to major respiratory illnesses and premature deaths.

It is important to note that there is no safe level set for exposure to nitrogen dioxide. Nitrogen dioxide is converted to nitric acid in the lungs, and this can exacerbate illnesses such as asthma, and other respiratory conditions. Studies[1] note the clear “associations between NO2 and respiratory problems among children”.

Monday, 7 March 2016

Odour Impact Assessment for Anaerobic Digestion (AD) Plant - Devon

Odour Impact Assessment for Anaerobic Digestion (AD) Plant

Acting on instruction from a client based in the greater London area, SWEL are to prepare an Odour Impact Assessment for a Anaerobic Digestion (AD) Plant in Devon.

The Anaerobic Digestion Plant  is to use agricultural feed stock in to produce gas, and ultimalty genrate electrcial energy vis the use of gas engines to feed in to the grid.

As solar and wind capacity increases  and base load capacity decreases, the UK must fill the gap. Anaerobic Digestion Plants offer the possibility of storing gas produced, and generating power when it is needed.

Odour Modelling

The odur impact assessment was conducted using odor concentrations derived from secondary sources, in the most part peer review scientific papers. These values were then used in a model to derive am odour concentration at near by receptors.

The model used was aeromod, which is the preferred modelling system used in the UK and USA. In fact the model was produced in the USA, by their equivalent of the Environment Agency the EPA.

The model works, by caluclating dispersion, and also "averaging" out plume concentrations based on wind directions. There are various parameters that can be changed, in cluding atmopshric stibility etc.

Owing to the comparatively low odor emissions from the proposed agricultural feed stock the odour impacts are very low.

SWEL can conduct Odour Impact Assessments on a quick turnaround and also offer odour modelling services, to air quality professionals.

Saturday, 5 March 2016

Environment Agency Flood Data - Thames Estuary

Until recently I was using the following email address to get flood data and maps for the thames estuary:

this email account will soon be closed, the new email to use to contact us will be

Despite having used the original address for a number of years I received no notice that it would be changed, and have found out the above via lengthy googling.

Hopefully it will save you the time!

In this day an age, would it not have been possible to email past customers to tell them about the change prior to closing the account?

Flood Risk

Wednesday, 3 February 2016

Sustainability Statement - Nottingham

Sustainability Statement - Nottingham 

Acting on instructions from a repeat client, SWEL are to prepare a sustainability statement for a car show room in Nottingham.

The car show room is a new build, and will incorporate a wealth of sustainability features.  The report submitted complements existing plans and specifications, whilst meeting requires for content set by the local planning authority.

The sustainability report includes modelling of the building envelope using SBEM, and will include renewable obligations set by the LPA.

Sustainability Consultants

Monday, 18 January 2016

Geotechncial Site Investigation - Devon

Site Investigation - Devon

Acting upon instruction from a management company located SWEL are to undertake a Geotechnical ivestigations at a holiday park near Totnes.

SWEL provide a wide range of geotechnical and environmental services to support our clients with there chosen projects. 

In this case SWEL are to prepare a retrospective specification for a raft foundation, to satisfy the local authorities requirements. The slab as stands, would appear to be installed to a very high standard, and is liklley over specified, and reside upon desnse gravels.