SELF-HELP MONITORING — A WISCONSIN LAKE —
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Transcript of SELF-HELP MONITORING — A WISCONSIN LAKE —
SELF-HELP MONITORING
— A WISCONSIN LAKE —
SELF-HELP MONITORING
— A WISCONSIN LAKE —
Mary Jane BumbyGreen Lake
Green Lake CountyWisconsin
Graph of Secchi & Temperature Readings
Graph of Secchi & Temperature Readings
2002 pier thick with aquatic plants! No swimming here!2002 pier thick with aquatic plants! No swimming here!
Mats of Oscillatoria sp.Mats of Oscillatoria sp.
Map:East & West Deep-waterMap:East & West Deep-water
Monitoring EquipmentMonitoring Equipment
Collecting Sample of Plankton after 17 Ft. vertical pull.
Collecting Sample of Plankton after 17 Ft. vertical pull.
Some Green Lake Plankton Deep-Water
Some Green Lake Plankton Deep-Water
2004 Monitoring Record Sheet and Data Collected
June 3
2004 Monitoring Record Sheet and Data Collected
June 3
G L Subwatershed AcreageG L Subwatershed Acreage
1992 Map of Watershed1992 Map of Watershed
1980-2003 Secchi Ave 1980-2003 Secchi Ave
SAME SECCHI “SMOOTHED” SAME SECCHI “SMOOTHED”
EAST & WEST MIN & MAXEAST & WEST MIN & MAX
RAINFALL MAY - OCT(MONITORING DATES)RAINFALL MAY - OCT(MONITORING DATES)
CLOSE TO LAKE SURFACE: SECCHI AT 1/2 M (2 FT) &
1/2 SECCHI READING
CLOSE TO LAKE SURFACE: SECCHI AT 1/2 M (2 FT) &
1/2 SECCHI READING
2003 WEST DEEP-WATERSTATION COLORS
2003 WEST DEEP-WATERSTATION COLORS
East Basin ‘86-03 WiDNRJuly and August
East Basin ‘86-03 WiDNRJuly and August
PARAMETERS SAMPLED:PARAMETERS SAMPLED:
WATER CLARITY
TEMPERATURE
DISSOLVED OXYGEN
TOTAL PHOSPHORUS
CHLOROPHYLL
Green Lake’s yearly data from 1980-2003 show:
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.
NONPOINT POLLUTION IS OF MAJOR IMPORTANCE
AROUND THIS LAKE
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).
SECCHI DATASECCHI 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.