“Let's not assume anything!
Actual residential water usage in Greater Vernon is closer to 222 litres per person per day, not 675.
http://obwb.ca/obwrid/docs/337_2009_Residential%20ICI%20actual%20use%20(Miles).pdf As Coldstreamer has calculated, we are already "doing the right thing" and conserving water (... probably because our rates are so high!).
Same story with BC Hydro - customers do the right thing and conserve energy, and then the utility hikes the rates. We can't win.”
The above comment was in response to my blog post entitled:
Some real data on Greater Vernon water use.The quoted reference by Anonymous was published by Jennifer Miles in 2009. She is currently employed by the North Okanagan Regional District. The report shows even lower per capita water use than was calculated by me. That calculation was based on water use data provided by Greater Vernon Water in their Annual Reports between 2011-2015 (reported average annual per capita consumption at 307 liters per day per capita).
There are some questions that must be asked:
The 2012 Master Water Plan was designed for a domestic capacity of 9,670 ML in 2011, increasing in steps to 13,360 ML in 2052. At the estimated consumption of 222 l/d/p the 9,670 ML would have supported a population of 119,339. Why would the planners design such a huge oversized infrastructure for a population of ~55,000? They must have been aware of the report by Jennifer Miles.
The 2052 consumption estimate of 13,360 ML would provide domestic water for a population of 164,877 using the 222 per capita estimates. Would we anticipate that kind of growth in 40 years?
Even at the per capita consumption of 307 l/d/p, calculated by me based on actual data, the projected 2011 consumption of 9,670 ML would have supplied over 86,000 people. That’s an oversize of 57%.
One set of data that made a huge influence on the per capita consumption was the high ICI water consumption. Without the ICI consumption the current per capita consumption could be in the low to middle 200's.
Obviously, if the 222 l/d/p consumption figure was used to estimate future water demands the plant would have been undersized. However, the currently available empirical evidence should be considered prior to establishing future water demand figures. Should we not incorporate actual data collected over 5 (or now 6 years)?
As for “Let's not assume anything!”: scientific reports must always state the assumptions the author of the report made in collecting the data for the study and for the conclusions.
Civil Servants must understand: services required by their employers, the public, must be provided cost effectively and to the demand the public requires within the available resources. If we require the public to finance an infrastructure that exceeds their needs and/or the capacity of the resource, then the customers pay more than they need to pay.
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