ORIGINAL Lake Forest Association

Labor Day 2017 Water Test is Good!

1 September 2017

Water samples were collected beginning at 11:00 am on Thursday August 31, 2017, by Anthony Henage.  The following results are very good.

#1                        Dock                       4  cfu
#2                        Cedar Fork Creek   4  cfu
#3                        Booker Creek         13 cfu

Caution level is individual reading above 400 cfu, or average above 200 cfu. CFU  = colony forming units per 100ml.

Lake water temperature ranged from 78.5-79.5F(25.8-26.4C).   The SECCI clarity reading was 22 inches, same as the previous test in July.

There was a light rain two days prior to the sample, less than 0.2 inch.   These readings continue to be very good and consistent with the results we have gotten in previous years.

Fecal coliform is an indicator organism, and our testing is required by the health department because we allow swimming in the lake.  We are very fortunate to have the consistently good results that we have been getting.  Before OWASA built the Countryside wastewater pumping station our results were generally in the safe range but much more variable than they have been since it went online.

One informal correlation I have noticed, for any amateur (or professional) bacteriologists who may read this is that the higher cfu count is usually associated with the lower water temperature.  My theory about that is: the bacteria we monitor lives in the gut of warm-blooded animals, and it dies in the water.  The cooler water is fed from rainfall and springs and it carries the bacteria from the source to the lake, where it slows down and warms up.  The lake is also diluting the bacteria by the simple geometry of volume, so the lower counts in warmer water may be the results of those two processes.  Any other theories?

Chuck Henage
chenagemht@aol.com

09.01.17 by Chuck Henage @ 2:53 pm
Filed under: Website| Water Quality Comments: None


Water Test July 10, 2017 is very good!

12 July 2017

Water samples were collected beginning at 8:45 am on Monday July 10, 2017, by Anthony Henage.  I measured 0.1inch of rainfall in the watershed 2 days prior to the sampling.    The following results are very good.

#1                        Dock                        less than 1  cfu
#2                        Cedar Fork Creek   12 cfu
#3                        Booker Creek          2 cfu

Caution level is individual reading above 400 cfu, or average above 200 cfu. CFU  = colony forming units per 100ml.

Lake water temperature ranged from 86-87F(30-30.5C).   The SECCI clarity reading was 22 inches.

The date for this water sampling was adjusted from its normal time; the week before July 4, because we added an extra sampling in early June, and felt it would be good to spread the dates for  the remainder of our sampling more evenly throughout the summer.  We are now back on our normal schedule and the next sampling will take place before Labor Day, unless we have some unusual weather or other event in our watershed.

Anthony took the samples for me because I broke my arm in late June and am not yet able to paddle the kayak.

The lake water has gotten warm earlier than normal, this year.  The tributary creeks are still flowing steadily and we are getting regular rain.   The SECCI reading of 22 indicates we have significant turbidity.  This is in the normal range, probably in keeping with getting regular rain and having very warm weather. The water in the sample bottles was without a color tint, so it is probably neither a big influx of silt nor an impending algae bloom. There was a light dusting of debris on the surface of the lake, and a pretty large flock of Canada Geese that moved from the park beach area over to the Cedar Fork Creek inlet while we were sampling.

Chuck Henage
chenagemht@aol.com

07.12.17 by Chuck Henage @ 10:24 pm
Filed under: Website| Water Quality| Lake & Land Mgmt Comments: None


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