Watching Our Water Ways

Environmental reporter Christopher Dunagan discusses the challenges of protecting Puget Sound and all things water-related.
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Posts Tagged ‘Flood’

Be alert for tidal flooding and King Tide photos

Sunday, December 16th, 2012

Some of the highest tides of the year, combined with a strong low-pressure system, could provide “King Tide” observers with ideal conditions tomorrow (Monday) for taking pictures of near-flood conditions or even flooding in some places.

This is the third year the Washington Department of Ecology has put out a call for photos of high-tide conditions.

Photo of Poulsbo waterfront taken during “King Tides” Dec. 28, 2011.
Photo by James Groh, Poulsbo

“Documenting how very high tides affect the natural environment and our coastal infrastructure will help us visualize what sea level rise might look like in the future,” states Ecology’s “Climate Change” blog.

The King Tide photo initiative began in Australia in January 2009. Washington and British Columbia joined in 2010, followed by Oregon and California in 2011.

Tide tables predict that tides in Bremerton and Port Orchard will reach 13.4 feet at 8:28 a.m. tomorrow. Check on other locations and other days in Washington state at Saltwater Tides.

The National Weather Service has issued a coastal flood advisory for Western Washington because of low-pressure conditions, which could add 1.5 feet to the tide table prediction. That would put the Bremerton area at 14.9 feet. Check out the Weather Service advisory and the Kitsap Sun story.

While it looks like we’ll have a very high tide, it probably won’t be a record. I was unable to find historical data for Bremerton, but the record high tide for Seattle is 22.4 feet on Jan. 27, 1983. The tide tables predict that Seattle will reach 12.5 feet tomorrow, or 14 feet with the added 1.5 feet because of the low pressure.

Historical data can be found on NOAA’s “Tides and Currents” webpage after selecting a station.

Shortly after I posted this, Jeff Adams of Washington Sea Grant sent me an email to point out that NOAA’s numbers need to be corrected by subtracting 7.94, because NOAA uses a different baseline than we commonly use in this area. That would place the record in Seattle at 14.5 feet, much closer to what we may see tomorrow. I should have known that something was amiss with that data. For more on this point, check out Jeff’s blog, Sea Life. 

King Tides will continue through this week, declining slightly each day, then will return on Jan. 14.

I’m certainly not hoping for high water levels, but where they occur it would be great to have some photos. Feel free to send them to me at cdunagan, as well as uploading to the Flickr page called “Washington King Tide Photo Initiative.”


Skokomish restoration now focused on ecosystem

Wednesday, January 25th, 2012

Flood control is no longer a primary objective of federal restoration work on the Skokomish River — but improving the ecosystem is likely to reduce flood problems for people who live in the valley.

The Skokomish Watershed Action Team (SWAT) surveys an area where the Skokomish River has wiped out all vegetation and left a massive gravel bar.
Photo by Steve Zugschwerdt

We don’t need to be reminded that the Skokomish is the most frequently flooded river in the state. Although I’m not sure how soon another river might take over that dubious distinction, it’s easy to see that a lot of time and money is being spent to get the river back to a more natural condition.

The Army Corps of Engineers, known for massive projects such as dikes, dams and dredging, won’t be adopting those sorts of projects for the Skokomish River.

Jessie Winkler, Skokomish project manager for the Army Corps of Engineers, explained it this way:

“Clearly, flooding is a problem in the basin. But because of limited residential and commercial activity, it would be very difficult to justify a flood-control project. In order to be justified as a federal project, the economic benefits must be greater than the cost.”

For further explanation, check out my story in Monday’s Kitsap Sun.

The good news is that the Corps has not turned its back on the Skokomish. In fact, the river is considered so important to the Hood Canal region that the agency is considering some large-scale projects focused on environmental restoration — including possibly relocating Skokomish Valley Road.

Other interesting ideas include creating sediment traps to capture gravel in selective locations, relocating existing dikes to create a wider river channel, forming new side channels to relieve flow on the main river and even aeration pumps to boost oxygen levels in Hood Canal.

Many of the projects designed for ecological improvement will also reduce the flooding problems.

A report, scheduled to be released in late spring or early summer, summarizes all information collected so far in the $4.7 million study of the Skokomish River watershed. The report will cover current ecological conditions, future ecological conditions without restoration and a list of potential restoration projects — including preliminary design, estimated costs and ecological benefits, Winkler told me.

Potential projects are only conceptual at this point, though experts have begun to look at locations along the river where different types of efforts may be fruitful. Further study will narrow the list of to a plan to be submitted to Congress for funding.

The upcoming report will begin to explore which of the following actions are most likely to succeed in specific locations:

  • Remove or breach levees/dikes
  • Construct setback levees/dikes
  • Create salmon spawning habitat
  • Reconnect wetlands, side channels, backwater areas, and tributaries
  • Substrate modification
  • Install aeration or oxygenation system in Annas Bay
  • Reconnect dendritic channels in estuary
  • Large woody debris
  • Engineered Log Jams
  • Fish passable weir
  • Channel stabilization
  • Riverbed and wetland vehicle exclusion
  • Enhance vegetation – riparian & estuarine
  • Control invasive species
  • Channel rehabilitation or new channel creation
  • Selective gravel removal on gravel bars
  • Spot-dredge
  • Sediment trap
  • Culverts: a) add; b) remove; c) replace; d) upgrade
  • Road modifications
  • Rehabilitate bank lines
  • Cool water diversion to Annas Bay

‘King tides’ are an invitation to take watery photos

Tuesday, December 27th, 2011

The Washington King Tide Initiative is entering its third year, and state officials would like people to shoot photographs of flooded roads, yards and buildings — if such events occur.

The high tide at the mouth of Gorst Creek comes close to reaching Toys Topless in Gorst. Photo by Meegan M. Reid, Kitsap Sun

In 2010, the high tide at the mouth of Gorst Creek comes close to reaching Toys Topless at the head of Sinclair Inlet in Gorst.
Photo by Meegan M. Reid, Kitsap Sun

High tides are expected to continue for the next few days and return to high levels again in mid-January. Whether flooding occurs at any one place depends on rainfall, winds and atmospheric pressure, as well as tidal levels dictated by the position of the moon and sun. (See NOAA Ocean Service Education.)

Not much flooding occurred during king tides last year, but plenty of photographs were collected in early 2010. That’s when the picture on this page was taken in Gorst between Bremerton and Port Orchard. For additional photos, check out the Flickr page or the video slide show put together by the Washington Department of Ecology.

Taking note of these high tides is one way to gauge how climate change may affect shoreline areas. Over the next 100 years, sea level is expected to rise by at least 2.6 feet, according to the U.S. Fish and Wildlife Service, although previous estimates by the Intergovernmental Panel on Climate Change were in the range of 7 inches to 2 feet.

The King Tide Initiative started in Australia in 2009, according to Ecology’s website on King Tides, but it soon became a project for the West Coast of North America, with Washington and British Columbia joining in 2010 and Oregon and California joining in 2011.

Visit Flickr pages for British Columbia, Oregon and California, which includes regional pages for San Francisco Bay, Santa Monica and San Diego.

For a list of high tides, go to Ecology’s King Tide Schedule page and click on the map. More precise information can be found on NOAA’s page of tide predictions, where you can zoom in to your area of interest.

For past King Tide events, check out my Water Ways entries for Jan. 21, 2011 and Feb. 1, 2010.


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"In the end, we will conserve only what we love, we will love only what we understand, and we will understand only what we are taught."Baba Dioum, Senegalese conservationist

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