Water Calculations Part G
Over the next 20 years, demand for water is set to increase substantially. This will be driven by population growth coupled with an ambitious programme of development on one hand, and increasing per capita water consumption on the other. Yet there is likely to be less water available – climate change is forecast to make it drier and the EU’s environmental protection legislation, combined with the general direction of government policy is likely to lead to tighter controls on abstraction. The overall picture is one of ever increasing demand for an ever scarcer resource, and less water will need to go further.
The economy is heavily dependent on water for agriculture, industry, tourism and recreation. Water shortages during drought have a deleterious effect on the internationally significant rivers, wetlands and wildlife and we must ensure that this is not exacerbated by the effects of abstraction.
Government Regulations – Part G of the Building Regulations and the Code for Sustainable Homes.
The Government is driving a sustainable development programme that mandates improved water efficiency in the built environment. The Code for Sustainable Homes was introduced in 2007 and Part G of the Building Regulations now includes water efficiency for the first time. In addition, improved water efficiency in new development will be backed-up through the planning system, as the Government allows the planning system to mandate water efficiency targets in excess of the Building Regulations where there is demonstrable local need.
Why Do You Need Part G Water Calculations?
Building regulations demand that new builds meet the minimum 125L litre per-person-per-day limit.
If the development is subject to the Code for Sustainable Homes, you will also be required to reduce internal potable water use further through the Wat 1 category.
Each Code level sets a mandatory limit on internal water consumption – this is demonstrated by producing calculations, based on occupancy, fittings and flow rates within the water efficiency calculator.
The current limits are set as follows:
- Level 1 & 2 – Less than or equal 120L p/day
- Levels 3 & 4 – Less than or equal 105L p/day
- Levels 5 & 6 – Less than or equal 80L p/day
A number of measures can be taken to reduce indoor water use. Flow restrictors are a convenient means to retrofit existing fittings. Low flow shower heads, low flush toilets or even smaller baths may be fitted.
Efficient appliances, grey water and rainwater recycling can also be specified.
We can suggest solutions and products which are efficient, practical and cost effective.
The Water Efficiency Calculator for New Dwellings.
Part G water calculations are based on “The Water Efficiency Calculator for New Dwellings” – The Government’s national calculation methodology.
In water usage calculation we require the use of water consumption figures from manufacturers product details.
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