RAIN PRO, Inc.
Rainwater Harvesting Systems
203 Spencer Street
High Point, NC 27265
336.847.8421

Water Use and System payback Example

The following is based on irrigation cost of $1,200.00 per year and considering 7% water cost increase for
municipal water per year:

Year                              Cost                        Combined Total

1                        $1,200.00                        $1,200.00
2                           1,284.00                           2,484.00
3                           1,373.00                           3,357.00
4                           1,470.00                           5,327.00
5                           1,572.00                           6,899.00
6                           1,683.00                           8,582.00
7                           1,800.00                         10,382.00
8                           1,926.00                         12,308.00
9                           2,061.00                         14,369.00
10                           2,206.00                         16,575.00
11                           2,360.00                         18,935.00
12                           2,565.00                         21,500.00
13                           2,744.00                         24,244.00
14                           2,936.00                         27,180.00
15                           3,141.00                         30,321.00

The above chart is based purely on speculation that municipal water costs will rise from five to ten percent
per year and that the average homeowner will have spent $1,200.00 for irrigation during the year.

For more accurate calculations, please contact your municipal water supplier for historical averages.


The above is based on normal water prices.
Some cities are proposing to increase water rates from 50% to as much as 500%
for excessive use.