0 comments | Print

Lake Tahoe's clarity shows gains for a second year

Published: Thursday, Feb. 28, 2013 - 12:00 am | Page 2B

The crystal blue waters of Lake Tahoe are getting more transparent.

The clarity of the alpine lake improved for the second consecutive year, according to UC Davis researchers. The lake's waters are the clearest in 10 years, they said.

In 2012, the lake's average annual clarity level was 75.3 feet – a 6.4-foot improvement over the previous year, according to information released Wednesday from the university's Tahoe Environmental Research Center and the Tahoe Regional Planning Agency.

"It is particularly encouraging to see clarity improve during wet years when the amount of fine sediments and nutrients going into the lake is high," said John Reuter, associate director of the UC Davis research center.

Scientists measure the lake's clarity by the depth at which a 10-inch disk remains visible when lowered beneath the water's surface. When the so-called Secchi disk was first used in 1968, it could be seen down to 102.4 feet.

Lake clarity degradation followed that measurement and steps have been taken to try to prevent cloudy water conditions.

Urban storm water runoff is a contributor to reduced clarity at the lake. Storm water, especially in the winter and spring, carries inorganic particles from undeveloped and developed land.

Efforts to reduce storm water runoff might be having a positive impact on lake clarity, but more data is needed to confirm that possible conclusion, scientists believe.

– Bill Lindelof

© Copyright The Sacramento Bee. All rights reserved.

About Comments

Reader comments on Sacbee.com are the opinions of the writer, not The Sacramento Bee. If you see an objectionable comment, click the "Report Abuse" link below it. We will delete comments containing inappropriate links, obscenities, hate speech, and personal attacks. Flagrant or repeat violators will be banned. See more about comments here.

What You Should Know About Comments on Sacbee.com

Sacbee.com is happy to provide a forum for reader interaction, discussion, feedback and reaction to our stories. However, we reserve the right to delete inappropriate comments or ban users who can't play nice. (See our full terms of service here.)

Here are some rules of the road:

• Keep your comments civil. Don't insult one another or the subjects of our articles. If you think a comment violates our guidelines click the "Report Abuse" link to notify the moderators. Responding to the comment will only encourage bad behavior.

• Don't use profanities, vulgarities or hate speech. This is a general interest news site. Sometimes, there are children present. Don't say anything in a way you wouldn't want your own child to hear.

• Do not attack other users; focus your comments on issues, not individuals.

• Stay on topic. Only post comments relevant to the article at hand.

• Do not copy and paste outside material into the comment box.

• Don't repeat the same comment over and over. We heard you the first time.

• Do not use the commenting system for advertising. That's spam and it isn't allowed.

• Don't use all capital letters. That's akin to yelling and not appreciated by the audience.

• Don't flag other users' comments just because you don't agree with their point of view. Please only flag comments that violate these guidelines.

You should also know that The Sacramento Bee does not screen comments before they are posted. You are more likely to see inappropriate comments before our staff does, so we ask that you click the "Report Abuse" link to submit those comments for moderator review. You also may notify us via email at feedback@sacbee.com. Note the headline on which the comment is made and tell us the profile name of the user who made the comment. Remember, comment moderation is subjective. You may find some material objectionable that we won't and vice versa.

If you submit a comment, the user name of your account will appear along with it. Users cannot remove their own comments once they have submitted them.

hide comments
Sacramento Bee Job listing powered by Careerbuilder.com
Quick Job Search
Used Cars
Dealer and private-party ads


Price Range:
Search within:
miles of ZIP

Advanced Search | 1982 & Older

Find 'n' Save Daily DealGet the Deal!

Local Deals