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Report Year: 2016
Green Belt Lake, Black Hawk County
Summary Data Table
Parameter6/6/20167/25/20169/7/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)5.85.55.05.45.25.66.14.65.36.25.95.64.85.35.24.84.85.45.4
Thermocline Depth (m)2.62.01.3N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)2.41.61.11.71.91.60.41.01.31.72.21.82.41.21.11.21.01.91.1
Temperature(oC)24.227.425.525.725.823.824.025.525.924.625.226.026.126.724.724.625.824.924.8
Dissolved Oxygen (mg/L)10.09.69.29.69.09.49.48.710.38.87.79.19.310.510.612.99.37.210.4
Dissolved Oxygen Saturation (%)119121112117.4110.3111.6114.1105.5126.4105.594.1112.0114.5131.6127.3155.6113.693.6125.7
Specific Conductivity (μS/cm)650.0640.0640.0643.3483.3310.0303.3820.0736.7653.3523.3750.1728.2687.4750.0651.0679.0499.7613.5
Turbidity (NTU)1.71.2<0.30.94.55.4175.55.17.82.31.33.3131.517.87.78.14.66.74.4
Chlorophyll a (μg/L)3.09.137.316.56.142.221.626.218.25.413.77.08.837.022.320.014.811.510.0
Total Phosphorus as P (μg/L)28.824.953.235.63093262.847.835.436.429.521233537384023-
SRP as P (μg/L)<2.8<2.8<2.8<2.8<4.3<5.673.6<10<11<8<9<1<1<1<1<1<1--
TKN (mg/L)0.510.610.830.650.591.781.491.030.760.68---------
Total Dissolved Solids (g/L)0.40.40.40.40.30.20.20.50.5----------
Total Nitrogen as N (mg/L)----------<0.750.610.740.870.660.960.880.700.78
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)<0.6<0.6<0.6<0.6<26<2650<14<145<136<130--------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)0-8-1-3-10<PRL<PQL<PQL<PQL<130--------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)<0.07<0.07<0.07<0.070.120.122<0.06<0.4<0.5-0.120.120.120.120.120.120.260.12
TN:TP ratio----------1830332617252347-
pH8.28.78.58.58.49.18.68.28.27.98.18.48.28.48.68.48.28.37.4
Alkalinity as CaCO3 (mg/L)88818886938972115110117116121107102103709799113
Silica as Si (mg/L)-------------5.014.454.093.72--
Dissolved Organic Carbon (mg/L)20.0416.5323.0219.8610.5264.354<7.6<6.4<6.28.405.667.156.199.498.20--
Inorganic Suspended Solids (mg/L)<0.81212<2.158<2<5<4<422113322
Volatile Suspended Solids (mg/L)144328206<8<9<823887764
Total Suspended Solids (mg/L)256439788<6<5<5457107866
Carlson Trophic State Index (Secchi)*47535952515374605652495147585958605158
Carlson Trophic State Index (Chl a)*41526658486761635947565052666160575553
Carlson Trophic State Index (TP)*535061565370846056565348495556575750-
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
6/6/20167/25/20169/7/2016

Contact Limnology Laboratory, Iowa State University