Hydrometry Framework

Lot 1 - Options Assessment At locations where we don't currently have any existing flow monitoring, we will often conduct an options assessment. This involves a site survey and, options assessment report as a minimum, and in many cases then detailed design drawings of the preferred option. In some cases, the supplier who undertakes the options assessment will then be appointed to install the preferred solution and then to operate and maintain it. Suppliers will need to be able to demonstrate independence and a comprehensive understanding of flow measurement techniques, measurement uncertainty, requirements of the relevant ISO standards, the pros and cons of each option and have demonstrable experience of designing and managing a contractor to install flow measurement solutions, often at remote sites. Flow measurement solutions may include, but not be limited to: Weirs and flumes, Velocity meters, Pipe flow meters, Stage-Discharge sites etc. All installation work will be carried out under CDM.

This lot involves the supply and installation of weirs and flumes, either based upon design drawings from an options assessment (see Lot 1), to replace an existing weir or flume or to design and install within an existing channel. Design and installation work should be undertaken in accordance with the relevant ISO standard, and be compliant with MCERTS requirements. All installation work will be carried out under CDM.

This lot involves the supply and installation of data loggers, water level sensors, rain gauges and water quality sensors. Wherever possible, the data loggers should be installed on telemetry, and be battery powered without solar panels. We currently use Hydro-Logic Flexi-Loggers, OTT EcoLog and NetDL loggers, and our preference is to appoint suppliers who can supply and install, maintain, calibrate and decommission these logger types. All installation work will be carried out under CDM. Applications include: - Water level sensors for flow monitoring at weirs and flumes - either pressure transmitters or non-contact sensors such as radar sensors. - Groundwater monitoring in boreholes - Rainfall monitoring - Water Quality monitoring Many of our sites are at remote locations, which are in open access areas. As such, the installations need to be low key and robust.

This lot will involve the supply and installation, calibration, maintenance and decommissioning of velocity meters (either contact or non-contact). Some of the installations will be in pipes requiring access to confined spaces, whilst others will be in open channels or pipes that are accessible from the surface. The velocity meters should be compatible with one of the telemetry loggers listed under Lot 3, and in most cases will need to be battery powered, without the need for solar panels. All installation work will be carried out under CDM. The following application types are anticipated under this lot: - Velocity meters in or over pipes located within confined spaces - Velocity meters in or over pipes not located within confined spaces - Velocity meters in natural open channels (e.g. in a small river) - Velocity meters in man-made open channels (e.g. at the inlet to a treatment works) Some installations will require MCERTS product approved sensors (e.g. at our consented abstractions and discharges for Mine water Treatment Schemes), but some will not (e.g. installations to measure flow within rivers or from mine adit discharges).

This lot involves spot flow gauging and water quality measurements, often taken at several locations within a particular catchment, or to validate existing flow measurement sites. Spot flow gauging techniques required will include Salt Dilution Gauging, Current Meter Gauging and ADCP Gauging, in accordance with the relevant ISO standard. Water quality sampling will include taking samples for laboratory analysis (in most cases sent to SOCOTEC laboratories), and manual measurements using a hand held water quality meter.

This lot includes MCERTS inspections at our Mine Water Treatment Schemes, flow meter calibration and QMS advice and auditing services. TCA operate approximately 75 Mine Water Treatment Schemes (MWTS), most of which have discharge consents which require the monitoring of effluent flow discharged from them. Flow monitoring is either via electromagnetic pipe flow meters installed at the inlet to the scheme, or thin plate weirs installed at the outlet to the scheme. Since our schemes are non-consumptive, the flow monitoring can be undertaken at the inlet or outlet, to satisfy the requirements of our permits

Suppliers who have bid for more than 1 of the other Lots can express interest in being awarded a slot on this Lot. Suppliers will be ranked based upon their average score for the other Lots that they have bid for. We will then seek to appoint the minimum number of suppliers which provides coverage of all of the Lots and geographical regions (Highlighted on the tender document).