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SELF-HELP MONITORING — A WISCONSIN LAKE —

SELF-HELP MONITORING — A WISCONSIN LAKE —. Graph of Secchi & Temperature Readings. 2002 pier thick with aquatic plants! No swimming here!. Mats of Oscillatoria sp. Map:East & West Deep-water. Monitoring Equipment. Collecting Sample of Plankton after 17 Ft. vertical pull.

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SELF-HELP MONITORING — A WISCONSIN LAKE —

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  1. SELF-HELP MONITORING—A WISCONSIN LAKE —

  2. Graph of Secchi & Temperature Readings

  3. 2002 pier thick with aquatic plants! No swimming here!

  4. Mats of Oscillatoria sp.

  5. Map:East & West Deep-water

  6. Monitoring Equipment

  7. Collecting Sample of Plankton after 17 Ft. vertical pull.

  8. Some Green Lake Plankton Deep-Water

  9. 2004 Monitoring Record Sheet and Data Collected June 3

  10. G L Subwatershed Acreage

  11. 1992 Map of Watershed

  12. 1980-2003 Secchi Ave

  13. SAME SECCHI “SMOOTHED”

  14. EAST & WEST MIN & MAX

  15. RAINFALL MAY - OCT(MONITORING DATES)

  16. CLOSE TO LAKE SURFACE: SECCHI AT 1/2 M (2 FT) & 1/2 SECCHI READING

  17. 2003 WEST DEEP-WATERSTATION COLORS

  18. East Basin ‘86-03 WiDNRJuly and August

  19. PARAMETERS SAMPLED: • WATER CLARITY • TEMPERATURE • DISSOLVED OXYGEN • TOTAL PHOSPHORUS • CHLOROPHYLL

  20. Green Lake’s yearly data from 1980-2003 show: • valid differences in Secchi data recording droughts and rainy times; • “smoothed” readings reveals cyclic lake responses; • from 1980 - 2003 trend shows some improvement in lake clarity and • lake’s east end is more turbid than west and includes about 68% of the 114 sq mi watershed.

  21. NONPOINT POLLUTION IS OF MAJOR IMPORTANCE AROUND THIS LAKE • ONLY IN VERY SMALL SITES CAN SEDIMENT THAT ENTERS THIS LAKE EVER BE REMOVED. • ESTIMATED “FLUSHING TIME” OF LAKE IS 17 - 21 YEARS ( 2 STUDIES).

  22. SECCHI DATA • ARE NOT J UST COLLECTED EMOTIONALLY AND THEN THEY BECOME SCIENTIFIC AND • SHOW THE HEALTH OF LAKES WHICH GIVES AN INDICATION OF HOW WE DO ON LAND WITHIN THE WATERSHED.

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