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Line 306: − + Line 494:
Line 494: − #For infiltration BMPs designed without sub-drains to determine active sub-surface water storage reservoir volume drainage time and filter bed surface infiltration rate.+ − #For infiltration BMPs designed with flow-restricted sub-drains, to determine sub-drain peak flow rate, active sub-surface water storage reservoir volume drainage time and filter bed surface infiltration rate.+ − #As part of Forensic inspection and Testing (FIT) work to determine corrective actions for suspected problems with drainage or effluent quality detected through other inspection and testing work.+ − −
→Continuous Monitoring
===Filter Bed Surface Infiltration Rate===
===Filter Bed Surface Infiltration Rate===
To evaluate surface infiltration rate using a surface ponding well during a simulated storm event, the filter media bed should be thoroughly wetted prior to the test. Measurements of filter bed drainage rate and corresponding estimates of surface infiltration rate should be made following natural or simulated storm events that deliver enough water to the BMP to pond at least 75 mm of water on the surface of the filter media bed, in an effort to consistently approximate saturated soil flow conditions.
To evaluate surface infiltration rate using a surface ponding well during a natural or simulated storm event, the filter media bed should be thoroughly wetted prior to the test. Measurements of filter bed drainage rate and corresponding estimates of surface infiltration rate should be made following natural or simulated storm events that deliver enough water to the BMP to pond at least 75 mm of water on the surface of the filter media bed, in an effort to consistently approximate saturated soil flow conditions.
====Calculation====
====Calculation====
At a minimum, continuous monitoring should be undertaken as part of Assumption and Verification inspections in the following situations:
At a minimum, continuous monitoring should be undertaken as part of Assumption and Verification inspections in the following situations:
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#When little information is available about the effectiveness of a certain type of BMP or treatment train (i.e., combination of BMPs) or when a new technology is being implemented for the first time in a certain context.
#Where the sensitivity of the receiving water warrants a high level of inspection and testing to determine if BMP effluent quality meets design specifications or regulatory criteria.
#As part of Forensic inspection and Testing (FIT) work to determine corrective actions for suspected problems with drainage or effluent quality detected through other inspection and testing work.}}
#When little information is available about the effectiveness of a certain type of BMP in a certain environmental context, or when a new technology is being implemented for the first time in a certain context or geographic region.
#Where the sensitivity of the receiving water warrants a high level of inspection and testing to determine if BMP effluent quality meets design specifications or regulatory criteria.}}
===External guidance on monitoring the performance of stormwater BMPs===
===External guidance on monitoring the performance of stormwater BMPs===