Saving money with rainwater 💦 harvesting from your commercial building
✔️Step 1: Find the historic rainfall levels in your area from Met Eireann:
https://www.met.ie/climate/available-data/monthly-data
✔️Step 2: Calculate your building’s roof collection area from Google Maps:
📍📍📍 https://www.google.ie/maps/
Right Click in map, select measure distance, draw a line around the roof and it will calculate the Roof Area in m²
✔️Step 3: Calculate your potential Annual rainwater yield:
Annual rainwater yield = P x A x R
P = annual rainfall in mm
A = Roof collection area in m2
R = Roof Co-efficient
Let’s look at an example:
Site Location : Dublin 15
Roof Area : 10,028m²
Roof Co-efficient : 0.8**
Rainfall : 757.9 mm/ Mean avg. / Year
Weather Station : Dublin Airport Station
Potential Water Savings : 757.9 x 10,028 x 0.8 = 6,080,177 Lt/Year
Area Potential Rainwater Water Savings: 6,080,560.45 Litres/Year or 6,080m3 /Year
Financial Savings : 6,080m3 x €1.99* = €12,099 / Year!
*Dublin Water Charges: Supply m3: €1.16, Wastewater Services m3: €0.83, Combined m3: €1.99
**typically you should expect to collect 80% of this rainwater each year due to losses in filtering and small rainfalls that do not generate enough runoff
☎️ 📲If you need any further information or help, do not hesitate to contact me