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Report Year: 2016
Big Hollow Lake, Des Moines County
Summary Data Table
Parameter5/25/20167/13/20168/26/20162016201520142013201220112010200920072006200520042003200220012000
Lake Depth (m)8.28.18.38.28.18.27.79.08.2----------
Thermocline Depth (m)1.14.52.9N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Secchi Disk Depth (m)5.40.70.72.21.41.61.21.71.3----------
Temperature(oC)22.225.525.224.324.220.824.724.425.3----------
Dissolved Oxygen (mg/L)10.510.419.213.414.410.915.88.914.6----------
Dissolved Oxygen Saturation (%)120126234160.1173.1125.3194.2107.6179.0----------
Specific Conductivity (μS/cm)700.0660.0470.0610.0510.0506.7400.0520.0396.7----------
Turbidity (NTU)<0.34.612.75.916.58.710.98.111.4----------
Chlorophyll a (μg/L)1.086.667.751.822.027.6103.827.628.3----------
Total Phosphorus as P (μg/L)24.082.3172.392.910866118.547.142.5----------
SRP as P (μg/L)<2.8<2.832.89.0<4.311.337.6<10<11----------
TKN (mg/L)0.731.311.841.291.460.871.781.231.23----------
Total Dissolved Solids (g/L)0.50.40.30.40.30.30.30.30.3----------
Total Nitrogen as N (mg/L)-------------------
(Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L)44.905.75<0.61129<2642<14<145----------
(Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L)31-9-2-1010<PQL<PQL----------
Nitrate + Nitrite (NO3 + NO2) as N (mg/L)3.380.45<0.0710.780.12412----------
TN:TP ratio-------------------
pH8.28.69.28.78.78.59.18.59.1----------
Alkalinity as CaCO3 (mg/L)146102109119113927910293----------
Silica as Si (mg/L)-------------------
Dissolved Organic Carbon (mg/L)29.7624.8827.0027.2114.7375.846<7.6----------
Inorganic Suspended Solids (mg/L)<0.8<0.8<0.8<0.83<2.1<3.24<5----------
Volatile Suspended Solids (mg/L)1910796114<8----------
Total Suspended Solids (mg/L)2911712814811----------
Carlson Trophic State Index (Secchi)*366666485653585356----------
Carlson Trophic State Index (Chl a)*317472696163766363----------
Carlson Trophic State Index (TP)*506878697265736058----------
*Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions.
       
 
 
 
Water Column Profiles
5/25/20167/13/20168/26/2016

Contact Limnology Laboratory, Iowa State University