Data Table
Below is a snapshot of our data table. 39 ponds total from around Edmonton were used in this study.
Descriptor and Variable Definitions
POND_ID:
Pond Name, shortened.
Pond Name, shortened.
Predictor Variables
POND_TYPE:
WTC=Constructed Wetland, WTL= Wet Ponds, WTN= Natural Wetland, WTD= Stormwater Influenced Natural Wetlands
POND_AGE:
The year the pond entered the storm water facility system (in the case of natural wetlands) or construction was finished (in the case of constructed wetlands).
WTC=Constructed Wetland, WTL= Wet Ponds, WTN= Natural Wetland, WTD= Stormwater Influenced Natural Wetlands
POND_AGE:
The year the pond entered the storm water facility system (in the case of natural wetlands) or construction was finished (in the case of constructed wetlands).
Response Variables
D_HEAVY_METALS: Dissolved Heavy Metals mg/L
Different from Total Heavy Metals as this specifies the amount of heavy metal that is unable to be filtered from the water.
T_HEAVY_METALS: Total Heavy Metals mg/L
Includes heavy metals able to be filtered from water through sedimentation and dissolved heavy metals.
PH: pH
T_SUS_SOL: Total Suspended Solids mg/L
TOTAL_CONDUCTIVITY: Total Conductive Elements mg/L
Different from Total Heavy Metals as this specifies the amount of heavy metal that is unable to be filtered from the water.
T_HEAVY_METALS: Total Heavy Metals mg/L
Includes heavy metals able to be filtered from water through sedimentation and dissolved heavy metals.
PH: pH
T_SUS_SOL: Total Suspended Solids mg/L
TOTAL_CONDUCTIVITY: Total Conductive Elements mg/L
Exploratory Graphics
The main goal of this project was to produce the following exploratory graphics explaining the relationship between pond age, pond type, and the water chemistry response variables.
Constructed wetlands appear to have a higher conductivity over time and higher dissolved heavy metals. Over time, it appears that the amount of suspended solids in the water remains fairly equal in Wet Ponds, while older Constructed Wetlands tend to see the accumulation of suspended solids. In Constructed Wetlands, older ponds become more acidic, and water conductivity is reduced.
Constructed wetlands appear to have a higher conductivity over time and higher dissolved heavy metals. Over time, it appears that the amount of suspended solids in the water remains fairly equal in Wet Ponds, while older Constructed Wetlands tend to see the accumulation of suspended solids. In Constructed Wetlands, older ponds become more acidic, and water conductivity is reduced.
Regression Residuals
Below are the residuals from the Linear Regression performed to analyze the relationship between Pond Age and water chemistry parameters.
Figure 4: Pearson Residuals of Linear Regression.