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*Outflow paths must be temporarily plugged or measured (aside from infiltration)
*Outflow paths must be temporarily plugged or measured (aside from infiltration)
*The water surface elevation can be measured throughout the test<br>
*The water surface elevation can be measured throughout the test<br>
<gallery mode="packed" widths=300px heights=300px>
flood-test-bioretention.jpg | Flood test for a bioretention LID facility.
Flood-test-permeable-pavers.jpg | Flood test for permeable pavers.
</gallery>
'''Long-term Monitoring (Level 4)'''<br>
'''Long-term Monitoring (Level 4)'''<br>
Monitoring offers a comprehensive approach to assessing peak flow reduction and water volume reduction. These reductions can be quantified by completing a water budget during natural storm events, specifically through the measurement of inflow and outflow. Long-term monitoring is especially recommended if the LID feature that is the subject of the test is the first of its kind in its given jurisdiction, if geologic conditions pose a concern, or if the feature is being implemented to protect sensitive and significant natural features. It is important to recognize, however, that the unpredictability of natural storm events can lead to inaccuracies in data collection. Furthermore, long-term monitoring generally has the highest cost of the four levels of monitoring.
Monitoring offers a comprehensive approach to assessing peak flow reduction and water volume reduction. These reductions can be quantified by completing a water budget during natural storm events, specifically through the measurement of inflow and outflow. Long-term monitoring is especially recommended if the LID feature that is the subject of the test is the first of its kind in its given jurisdiction, if geologic conditions pose a concern, or if the feature is being implemented to protect sensitive and significant natural features. It is important to recognize, however, that the unpredictability of natural storm events can lead to inaccuracies in data collection. Furthermore, long-term monitoring generally has the highest cost of the four levels of monitoring.