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Report Year: 2016
Green Valley Lake, Union County
Summary Data Table
Parameter6/13/20168/1/20169/13/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)6.56.46.36.46.56.46.35.43.5--6.46.46.56.56.66.46.43.4
Thermocline Depth (m)2.26.2NilN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)0.80.40.40.50.50.51.10.40.4--1.10.91.31.01.41.61.30.5
Temperature(oC)26.325.222.124.523.220.922.823.724.1--24.025.424.022.522.723.523.224.9
Dissolved Oxygen (mg/L)13.84.16.08.09.74.06.47.35.5--7.28.38.37.68.711.18.47.1
Dissolved Oxygen Saturation (%)172506996.7115.444.373.486.463.6--84.6100.197.687.997.4134.299.985.7
Specific Conductivity (μS/cm)230.0210.0230.0223.3213.3250.0273.3313.3250.0--277.5313.2310.0309.1308.1297.7301.7386.0
Turbidity (NTU)12.994.532.246.530.613.715.622.339.3--11.813.8288.919.727.74.917.844.3
Chlorophyll a (μg/L)43.056.260.053.183.124.220.271.456.9--25.541.350.329.920.389.145.938.3
Total Phosphorus as P (μg/L)65.6285.5343.0231.4236167173.6393.7454.5--4565716411613583-
SRP as P (μg/L)<2.8145.8148.497.890.879.889.7232.8346.9--5.2<128.64.019.422.6--
TKN (mg/L)0.811.231.171.071.781.841.261.810.56----------
Total Dissolved Solids (g/L)0.20.10.20.10.10.20.20.20.2----------
Total Nitrogen as N (mg/L)-----------3.311.922.182.851.961.763.572.02
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)<0.6<0.6<0.6<0.6602573978<145----------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)-30-2-2173<PRL<PQL<PQL----------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)0.28<0.07<0.0700.760.461<0.061--2.250.611.301.620.810.432.840.64
TN:TP ratio-----------78374945252946-
pH8.98.68.58.79.17.88.28.28.8--8.48.58.48.38.28.88.27.5
Alkalinity as CaCO3 (mg/L)89971009585106111142100--1101261221269212189132
Silica as Si (mg/L)-------------3.071.681.252.20--
Dissolved Organic Carbon (mg/L)19.8426.0327.1524.3411.5986.406<7.6--5.657.466.294.6511.1010.33--
Inorganic Suspended Solids (mg/L)55107945911--566562615
Volatile Suspended Solids (mg/L)8141914167101311--58565434
Total Suspended Solids (mg/L)131928202511162223--101411101113919
Carlson Trophic State Index (Secchi)*647472696969597274--5961566055535771
Carlson Trophic State Index (Chl a)*687071707462607270--6267696460756866
Carlson Trophic State Index (TP)*648688838378799092--59646664737568-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
6/13/20168/1/20169/13/2016

Contact Limnology Laboratory, Iowa State University