SELF-HELP MONITORING — A WISCONSIN LAKE — Mary Jane Bumby Green Lake Green Lake County Wisconsin
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.
Some Green Lake Plankton Deep-Water
2004 Monitoring Record Sheet and Data Collected June 3
G L Subwatershed Acreage
1992 Map of Watershed
Secchi Ave
SAME SECCHI “SMOOTHED”
EAST & WEST MIN & MAX
RAINFALL MAY - OCT (MONITORING DATES)
CLOSE TO LAKE SURFACE: SECCHI AT 1/2 M (2 FT) & 1/2 SECCHI READING
2003 WEST DEEP-WATER STATION COLORS
East Basin ‘86-03 WiDNR July and August
PARAMETERS SAMPLED: WATER CLARITY TEMPERATURE DISSOLVED OXYGEN TOTAL PHOSPHORUS CHLOROPHYLL
Green Lake’s yearly data from show: valid differences in Secchi data recording droughts and rainy times; “smoothed” readings reveals cyclic lake responses; from 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.
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 YEARS ( 2 STUDIES).
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.