Studies of IDRC Supported Research on Greywater in ... - inwrdam

31
3.5 Project Benefits
There are three types <strong>of</strong> benefits <strong>of</strong> such a project: financial, socio-economic and
environmental. The benefit stream appears in the 1 st year after construction and
continues to the end <strong>of</strong> equipment useable life. More details are shown below:
3.5.1 Financial Benefit
The financial benefits are the benefits that have direct market values. These are: (1) the
additional water (excluding the existing water supply) that will be used by beneficiary
groups. The water bills for household will be considered to determine the savings in
water consumption, (2) the incremental quantities <strong>of</strong> the products that are irrigated
by this water like olives and (3) the savings due to minimizing the quantities <strong>of</strong> black
water that need to be discharged from the septic tanks. Table 3.4 shows the annual
revenues <strong>of</strong> all the surveyed families where the average annual revenue per family is
around 187.86 US$. It can be seen from the collected data about the revenues that
there are some unrealistic answers (around 5%) by some surveyed families and this
was expected in the survey analysis. In an attempt to initiate a clustering breakdown
regarding the answers <strong>of</strong> the surveyed sample, the following can be resulted:
1. Annual revenues (0–70.63 US$): 17 cases
2. Annual revenues (72–141.25 US$): 11 cases
3. Annual revenues (142.66–282.49 US$): 18 cases
4. Annual revenues (283.90 US$ and more): 14 cases
From the Pie chart, it can be seen that the largest cluster is number (3) with 18 cases,
followed by cluster (1) with 17 cases, followed by cluster number (4) with 14 cases and
finally cluster number (2) with 11 cases.