Graduate Thesis Or Dissertation


Assessment of Multi-year Hydrologic Performance of Bioretention Facility using Real-Time Sensors Public Deposited

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  • Bioretention facilities are emerging as a popular way to deal with stormwater runoff in urban environments and address its concerns. Real-time sensors installed in bioretention facilities aid in understanding the performance and feasibility of such facilities over time. A bioretention facility in Corvallis, Oregon was monitored for a study period of 3 years using real-time sensors deployed to measure flows in and out of the facility along with soil moisture content in the bioretention cells. Flow was monitored using Steven’s SDX sensor, and Decagon’s CTD sensor. The soil moisture content was monitored using Steven’s Hydra Probes. Overall, results have indicated that performance of CTD sensors was significantly better than SDX sensors in both inlets and outlets. There was large variability in captured runoff ranging from high 94% water treatment to as low as 6% treatment. The bioretention cells were able to maintain peak flow reduction ratio of 0.87, 0.82, 0.85 and 0.76 for fall, winter, spring and summer respectively throughout the study period. Mean peak delays was 44, 19, 150 and 55mins for fall, winter, spring and summer respectively. Soil moisture reading were dependent on the longitudinal distance away from the inlet. The mean values increased from 2015 to 2017, however the variability and standard deviation decreased. Decay rates during drying periods had high variability in 2015 but showed stability after that year. 
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