Drought and Flooding increases CA Levees risk of failure

October 16, 2015
USA: California, Sherman Island, on north shore of Sacramento Delta, levee

California, Sherman Island, on north shore of Sacramento Delta, levee

Almost 5 years of drought, now combined with recent rainfall-induced flooding, has weakened California’s levees. Culprits are soil cracking that allows water seepage, soil-strength reduction, land subsidence and erosion, all of which NWNL observed on its California Spotlight expeditions in 2014 and 2015. Fifty-five percent of California’s levee systems are now in danger of failing in the event of a flood or an earthquake. If the levees fail, water quality could be compromised for over 23 million people.

Levees are sand and clay earthen embankments which regulate water levels and protect dry land from floods. More research, risk science, community education and stakeholder collaboration are crucial to improving levee resilience.

Related article in Science Magazine: https://grgusyd.files.wordpress.com/2015/08/vahedifard-et-al-2015_ca-drought-levees_science.pdf

USA: California, Arbuckle, irrigation drainage ditch, levee

California, Arbuckle, irrigation drainage ditch, levee

One Response to “Drought and Flooding increases CA Levees risk of failure”

  1. Laurence Pearson Says:

    How prescient Alison, as you have now heard, I am sure, of the massive damage todaymfrom mudslides on Highway 5. Your warning to take heed arrived along with NOAA’s reiteration yesterday that California will experience big rains this winter from the powerful El Niño that has developed.

    Carol and I send our love,

    Larry

    >


Leave a comment

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: