If you are preparing an environmental impact assessment (Ietekmes uz vidi novērtējums, IVN) for a development in Latvia, noise may need to be assessed as part of the process.
Latvian IVN requirements include an assessment of the predicted emissions and environmental impacts of a proposed activity. This includes noise generated during both construction and operation where relevant. The IVN report must describe the predicted type and amount of emissions, including noise, and explain the methods used to assess the environmental impact.
For a planned development, this often means that existing noise measurements alone are not enough. If the development has not yet been built or its operation will change, noise modelling can be used to predict the future noise impact and assess what may happen at surrounding properties.
When Is Noise Modelling Needed?
Not every IVN requires a separate noise-modelling study. The need for modelling depends on the characteristics of the proposed activity, its potential noise sources, the surrounding area and the requirements established for the particular assessment.
Noise modelling becomes particularly useful when a planned development could significantly change environmental noise. Examples can include industrial facilities, large logistics or commercial developments, transport infrastructure, extraction activities and energy projects such as wind farms.
The purpose is to predict how noise from the proposed activity will spread through the surrounding area and what levels may occur at nearby residential buildings and other noise-sensitive locations. Latvia's environmental noise regulations provide indicators, assessment conditions and calculation methods for environmental noise.
Why Measure Noise If the Development Has Not Been Built?
Noise measurements and noise modelling answer different questions.
A noise measurement tells you what the acoustic environment is like at a particular location and during a particular period. This can be useful for establishing existing conditions before a development is constructed.
Noise modelling, on the other hand, can predict the noise that may be generated by the proposed development. It allows the planned sources to be assessed before they are operating and can help identify whether additional noise-control measures may be necessary.
For an IVN, this distinction is important because the assessment is concerned with the potential future impact of the proposed activity, not only the noise that exists at the site today.
What Information Is Needed for Noise Modelling?
The exact information depends on the project, but the modelling normally starts with a clear description of the proposed development and its surroundings.
We may need site plans, building layouts, terrain or topographic information and the locations of nearby noise-sensitive buildings. Roads, access routes, barriers and other structures can also be important because they may affect how sound travels through the area.
Information about the planned noise sources is particularly important. This can include machinery, ventilation and other technical equipment, production processes, loading and unloading activities, vehicles, internal roads, rail traffic and other sources associated with the development.
Where available, existing noise measurements can also be useful for describing the current acoustic environment and supporting the assessment. The need for measurements depends on the objectives and scope of the particular project.
What Does the Noise Model Tell You?
A noise model calculates how sound is expected to propagate from the planned sources across the surrounding area. The results can then be used to assess predicted noise levels at selected locations or across a wider assessment area.
The model can take account of the location and characteristics of the noise sources, buildings, terrain and other relevant features. Depending on the project, different operating conditions or scenarios can also be assessed.
This can help identify areas where predicted noise levels may approach or exceed applicable limits and can show where additional noise-control measures may be needed. Latvia's noise regulations specify environmental noise indicators and assessment methods, while the IVN framework requires the relevant predicted environmental impacts and the methods used to assess them to be described in the report.
Can Modelling Help With Noise Mitigation?
One of the main benefits of carrying out noise modelling during the planning stage is that potential problems can be identified before construction.
If the results indicate that noise could be excessive at nearby residential properties or other sensitive locations, different solutions can be considered. Depending on the project, these could include changing the position or operating conditions of equipment, installing acoustic barriers, improving the acoustic performance of buildings or changing traffic routes and operating arrangements.
Testing these options in the model can help the project team understand which measures are likely to reduce the predicted noise impact before the development is built.
How Long Does Noise Modelling Take?
The timeframe depends on the size and complexity of the project and how much information is available at the beginning.
A relatively straightforward assessment with a limited number of noise sources and a well-defined site can often be completed within several working days. Larger industrial, infrastructure or planning projects can take several weeks, particularly when there are many noise sources, a large assessment area, several operating scenarios or different mitigation options that need to be assessed.
We can confirm the expected timeframe after reviewing the project information and understanding what needs to be included in the IVN noise assessment.
How Much Does Noise Modelling Cost?
The cost depends on the complexity of the project rather than simply the size of the site. The number of noise sources, assessment area, operating scenarios, surrounding buildings and terrain, and the amount of mitigation modelling required can all affect the final price.
NoiseHunters noise modelling starts from €480 + VAT per project. More complex IVN assessments are quoted individually after reviewing the available project information.
Do I Need Noise Modelling or Noise Measurements?
If the development already exists and you need to establish the current noise level, professional noise measurements may be appropriate. If the development is still being planned and you need to predict its potential future noise impact, noise modelling may be more appropriate.
In some projects, both are useful. Existing measurements can help describe the current acoustic environment, while modelling can show how the proposed development could change noise levels after construction.
The right approach depends on the project and the requirements of the particular IVN procedure. If you are unsure what is needed, you can provide the project information first and the appropriate assessment scope can then be determined.
What Should You Send Us?
You do not need to prepare a complete acoustic assessment before contacting us. Start with the project location, site plan and a description of the planned activity. Information about planned equipment, operating hours, production processes and expected traffic is also useful if it is already available.
From this information, we can determine which noise sources need to be considered, what additional data may be required and whether existing measurements should form part of the assessment.
Need Noise Modelling for an IVN in Latvia?
NoiseHunters provides environmental noise modelling and acoustic assessment services throughout Latvia. We work with developers, planners and project teams to assess the predicted noise impact of planned developments and identify appropriate noise-control measures.
If you are preparing an IVN and are unsure whether your project needs noise modelling, send us the project details. We can review the proposed activity, discuss the required scope and provide a quotation and expected timeframe before the assessment begins.
Disclaimer: The need for noise modelling, assessment methodology and required input data depend on the specific project, its potential environmental impacts and the applicable IVN requirements. This article provides general information and should not be treated as a project-specific regulatory assessment.