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→Deeper wells
* Ensure there is a small reservoir in the well to keep your level probe submerged in dry conditions.
* Ensure there is a small reservoir in the well to keep your level probe submerged in dry conditions.
* Where possible, wells for measuring water levels within permeable pavement systems should be outside of trafficked areas.
* Where possible, wells for measuring water levels within permeable pavement systems should be outside of trafficked areas.
===Monitoring Well Specification===
The monitoring well should be installed during construction in a pervious area within the trench between tree planting areas. The well should be vertical from top to bottom.
'''Material''' The pipe should be rigid to prevent bending (e.g. PVC).
'''Diameter''' minimum 100 mm
'''Perforations''' The perforations may be similar spacing similar to [[underdrain]] pipes. Perforations are only required on the bottom third of the pipe. The well should be sealed at the surface to prevent short circuiting of surface water flow along the sides of the well. Bentonite clay is often used for this purpose.
'''Sock''' The perforated portion of the pipe should be wrapped with a geotextile sock. Standard geotextile provided with perforated pipe may be used.
'''Bottom''' The bottom 100 mm of the well should be capped and free of perforations to provide a small reservoir of water to keep the sensor wet during dry weather.
'''Length''' The well should extend into the native soil below the facility by a minimum 150 mm. Top should be above the surface overflow elevation or above the maximum ponding depth to prevent surface water from entering the well. If the perforated drainage pipe is installed in a v-notch below the bottom of the facility, the well should extend 150 mm below the invert of this drainage pipe.
'''Cap''' The well should be finished with a lockable cap to prevent vandalism.