Specifications

A Remote Automated Water Quality Stream Gauging System Design 8
8
Figure 3 Example of a soft substrate installation.
3.1.2. Hard substrate
A shallow, hard substrate, such as bedrock, provides the best condition for pier installation.
The presence of bedrock allows direct bolting using chemset anchors, providing a strong
positive attachment for the instrument pier.
Two brackets are fixed using chemset anchors bolted directly into the substrate and then
braced. The bracket for the main pier is the same design as a foot clamp for a large platform.
The brace clamp assembly from the soft substrate installation is also used placed flat and
directly bolted to the rock. The bracing is then attached between the pier and the brace
clamp assembly in the same configuration as per the soft substrate installation.
The base of the pier and the brace clamp assembly are then encased with concrete to
complete the installation.
3.2. Mounting instrumentation
The Starflow and turbidity mounts are bolted around the main pier to form a single structure
to which the instruments are attached.
The forward facing velocity probe is attached to the Starflow mounting plate using the
mounting clamp and 6 mm stainless steel bolts with nylon locking nuts supplied with the
sensor. The cable is shrouded as shown in Figure 4 and routed around to the back of the
mount.