Changes

* Ensure there is a solid cap on the bottom of the well to form a small water reservoir (e.g., 100 mm deep) to keep the water level sensor submerged during dry conditions. This practice also helps with checking calibration of the sensor.

* Ensure there is a solid cap on the bottom of the well to form a small water reservoir (e.g., 100 mm deep) to keep the water level sensor submerged during dry conditions. This practice also helps with checking calibration of the sensor.

==Deeper wells==

==Deep wells==

Some LID features are designed to retain water within the media that makes up the LID feature (e.g. [[permeable pavements|permeable pavement]] will be on top of a gravel bed where water can be stored). To measure the amount of water retention in a monitoring well, install a water level logger:

Many types of LID practices are designed to retain water within an internal water storage reservoir or layer (e.g. full and partial infiltration [[Bioretention|bioretention], [[Stormwater tree trench|stormwater tree trench]] and [permeable pavements|permeable pavement]] designs, infiltration trenches and chambers, and exfiltration trenches). To facilitate measurement of water level in the internal water storage reservoir or layer and periodically evaluate drainage performance over the operating life cycle of the facility, include a monitoring well located in the lowest elevation portion of the practice or system:

* Install the well while the feature is being constructed or undergoing major maintenance.

* Include monitoring wells in design drawings and details and install at an appropriate time during construction, or as part of repair work for facilities in need of rehabilitation.

* If there is an underdrain in the feature, make sure the bottom of the well reaches below it.

* Ensure the perforated section of the well is located within the internal water storage reservoir or layer only, and that it extends to the bottom elevation of the practice at a minimum.

* Install the well so that surface water will not impact the water level within the well. A standard monitoring well casing over the well pipe should be sufficient.

* Design and install the well so that surface water will not affect water level readings. A standard monitoring well casing and cap to protect, secure and provide access to the well should also be included.

* If possible, measure the depth of the underdrain. Having this measurement helps determine when water is percolating into the underdrain.

* Ensure there is a solid cap on the bottom of the well to provide a small water reservoir (e.g., 100 mm deep) to keep water level sensor submerged during dry conditions. This helps with checking calibration of the sensor as well. 

* Ensure there is a small reservoir in the well to keep your level probe submerged in dry conditions.  

* Where possible, wells should be located in areas with little or no vehicular traffic for ease of access.

* Where possible, wells for measuring water levels within permeable pavement systems should be outside of trafficked areas.