United Kingdom Average Rainfall by region and tank sizing:

The tank sizing is scientific and based on annual average rainfall per Met statistics and project roof size, however issues such as available space for tank housing, intended use of harvested rainwater, access for tank delivery and installation etc. all come into play when we design project specific systems. In many instances the tank can, on the outside look under or oversized to the untrained eye.

 All the Tichmatic Rain systems come complete with float level switches to ensure mains water is used at the barest minimum and only when absolutely necessary in times of low rainfall and only to meet minimum system demand. All the automatic refill float level switches are set to meet the minimum system demand threshold thus leaving the storage vessel largely empty and ready to harvest any rain as it falls. Remember when you are harvesting you are not using the water but storing it for a use when there is no rain instead of drawing on mains treated water. This is the intelligent use of water and a reduction of your carbon foot print by minimising the use of mains treated water and a direct contribution to your SUDS (sustainable drainage system) alleviating pressure on storm drains and minimising potential for flooding by using rain water where it falls, thus making rainwater harvesting an environmentally friendly investment that also guarantees you points should you need them on CSH.

These systems as stand alone are powered with a Kit X that includes all the controls and pressurised pump station to make it all work. If it’s combined with the irrigation our versatile automatic irrigation systems computers integrates both systems easily to make a compact all automatic system all round. This is generally the way to go and a cheaper option as it ensures the landscaped areas are watered with a completely reduced carbon footprint while providing the desired landscape aesthetics.

Table 1: above is the average annual rainfall figures for the last 30 years; use these figures in conjunction with table 2 below to find the volume of water you can expect to collect
source: Met Office

Table 2: expected volumes of water collected in cubic metres can be found by checking your average rainfall (see table 1 above) against your roof area
source: Environment Agency

Rainfall (mm)  x  Building Footprint Area (m²)  x  0.9 0r 0.8 (Tile Roof or Slate/Stone Roof) = ARY

ARY x 0.05 = 5% ARY

To calculate the Annual Rainwater Demand (ARD) use the following calculation:

No. of Residents x 16,000 = (1)   Area of Garden (m²) to be watered (if any) x 60 = (2)

(1) +(2) = (3)

(3) x 0.05 = ARD

You are not allowed to instal a rain harvesting tank that is larger than the smaller of these two figures as the water will become stagnant and a breeding ground for bacteria, including Legionnaires Disease.

Our Systems

All our systems are an assemblage of state of the art automatic irrigation technologies as can be found anywhere on earth, thus they are second to none. We have used our many years of experience to come up with these design specifications to make life much easier for landscapers to quote for the irrigation and rainwater harvesting element in their bids for landscaping projects, garden design and for the general public to buy systems supplied transparently with no hidden costs.

1. Wth the 1500 Rewatec F-line range excavation is much simpler and can be done by hand as they do not need to be too  deep, thus minimizing skip use to cart away excess soli, reduced excavation labour for both manual and digger machine.
2. These tanks are high tech and very robust with both pedestrian and car duty at much less than a meter soil cover, with custom extension shafts and shaft cover.
3. Automatic refill with air gap tundish detail
4. Pressurised pump station with electronic cut off, float suction, automatic irrigation system compatible etc.
5. Independent controls
6. System in tank integrated Maclean rainwater filter
7. Overflow siphon
8. Please see the resource page below and under Product Resouces for links to all technical literature

1. Reduces your carbon footprint by minimising treated mains water use, thus an environmentally friendly and sustainable intelligent water use solution.
   
2. Untreated natural rain water is very good for the plants in irrigation as it comes with already balanced natural nutritional value.
3. Reduce downstream flooding by using rain water instead of releasing it to storm drains, thus comply with SUDS (sustainable drainage systems) requirements
4. Real cost saving for you personaly in terms of water bills and the country by minimising usage of mains treated water where use of treated mains water is not essential.This includes the pumping, chemical treatment in purification etc.
5. Makes your property eco friendly and gives you a signature of sustainability thus adding real value you to property.