Earlier this year, the Regional Water Quality Committee received a briefing from King County staff regarding water supply and demand balances for the region. The above chart shows total population growth from 1975 through 2010 and contrasts this with regional water consumption. Total current water consumption is actually significantly less today than it was in 1975. On a per capita basis, major cities like Seattle have seen their water consumption fall from over 288 gallons per day (gpd) per household to an average of under 200 gpd - and this includes water used for landscape irrigation. Excluding landscape irrigation, which peaks in summer months, many households now use 100 gpd or less. I'll have to see how our community of Black Diamond is doing compared to these regional trends.
Does this represent a success for conservation efforts? One would think so with significant further conservation opportunity still available in the years ahead. Conservation, however, does create challenges for the water supply planners. No City Public Works Director or regional planner wants to be the one who under-forecast water demand and led to shortages. The following chart does a good job of outling this "planners" dilemma.
As population grows, planners' forecasts show increasing water demand - and every year, their forecasts for demand substantially overstate true demand. Making policy decisions based on these "inflated" projections can prove to be very expensive for communities and the region. The result, and I view this as good news, is that current water supplies, even excluding significant further conservation bonuses, are more than adequate to meet our region's needs well past 2060 - even with the worst potential impacts of climate change built in.

With such a positive outlook, who might benefit most? The simple answer - OUR FISHERIES! Current water supplies include many "marginal" sources of supply.
One quick example - wells currently used by the Covington Water District, including one located within 100 yards or less from Lake Sawyer. There is more than enough water available to meet the districts needs well into the future without pumping water from local wells. Pumping from these wells reduces area groundwater levels and results in reduced seasonal water flows in Covington Creek and Soos Creek. Reduced flows mean lower dissolved oxygen and higher temperatures - not good for fish.
Another example - summer month seasonal flows in the Green River need not be managed as low as they are today by the City of Tacoma at the Howard Hanson Dam. Keeping flows higher does nothing but help our fisheries as I am sure the tribes will attest.
Given the region's track record of success in conservation, it's time to rethink our current water management regimes and have more faith in the future of conservation.