Sampling Automation

Project Description

This project is designed to test a system that can automatically collect total suspended sediment (TSS) samples at sediment retention ponds. Firstly, this aims to introduce automation to the collection of samples for compliance following rain events and reduce Health and Safety risks. Second, it gives a better understanding of the temporal nature of sediment retention within a pond, how storm flows operate and how representative current consent compliance conditions are. Finally, it will enable investigation into flocculation dosing options based on the outcomes.

Two automated sampling units will be deployed to an SRP, one to the inlet to the SRP and the other at the outlet. Included in one of these units will be a raingauge that will trigger sampling based on site consent conditions. When rainfall conditions exceed trigger values, a sample will be collected at each point. Additionally, a sample can be collected by a user triggering an online sample request button.

Monitoring will then be expanded at each point to include a camera and time-series sensor measuring one or more of the following: turbidity, clarity or total suspended solids. This will allow better temporal understanding of discharge and collection of visual metadata at the time of sample collection. Finally, the inlet sampling point will be adapted to investigate floc dosing based on observed sediment load to the SRP, including water level and flow measurements. This will be a part of the SMART POND: INLET project (outside of this design brief).

Project Manager

Ed Clayton will be the project manager

Delivery Outcome and Timeframe

Phase 1: Site trial and deployment of test units
In progress – due end of October 2021

Phase 2: Additional sensors and cameras
In progress – due summer 2021/2022

Phase 3: Include flocculant dosing system at inlet (in conjunction with SMART POND: INLET)
TBC