Scope
Reference
C/2526/0017(A)
Description
The Geoscience Team have set up a project to review the groundwater level data we hold from
across our groundwater monitoring network (130 sites). We have chosen 40 site to look at in
more detail using the modelling code the British Geological Survey (BGS) have developed to
get a standard groundwater index (SGI).
The aim of the project is to use the AquiMod 2 groundwater model (Mackay et al. 2022) in
conjunction with historical, bias corrected climate data to reconstruct daily groundwater level time series back to 1894 at each borehole, before calculating an equivalent standardised time
series which can be used to assess the historical occurrence of groundwater drought at each
borehole.
Once the data is processed through the modelling code, we (NRW in house) can then use this
data to compare and review groundwater levels from sites with different geologies and
geographical areas from around Wales in a standardised way. This allows analysis of drought
response and allow us to consider drought management in the future.
The BGS have developed the modelling code to determine the SGI. They are the only
organisation within the UK that can use the modelling code as the code is not commercially
available. As the BGS are the only organisation we must follow the Single Tender Action
procurement process to secure a contact for the works.
Contract 1. Groundwater Level Network Review – Standard Groundwater Index modelling of 40 sites across Wales
Supplier
Contract value
- £37,304.35 excluding VAT
- £44,765.22 including VAT
Below the relevant threshold
Date signed
11 August 2025
Contract dates
- 18 August 2025 to 31 December 2025
- 4 months, 14 days
Main procurement category
Services
CPV classifications
- 72316000 - Data analysis services
- 72319000 - Data supply services
Contract locations
- UKL - Wales
Procedure
Procedure type
Below threshold - without competition
Supplier
British Geological Survey
- Public Procurement Organisation Number: PWHV-7273-PGJY
Environmental Science Centre
Keyworth, Nottingham
NG12 5GG
United Kingdom
Email: joncka@bgs.ac.uk
Region: UKF16 - South Nottinghamshire
Small or medium-sized enterprise (SME): No
Voluntary, community or social enterprise (VCSE): No
Contract 1. Groundwater Level Network Review - Standard Groundwater Index modelling of 40 sites across Wales
Contracting authority
Natural Resources Wales
- Public Procurement Organisation Number: PBBR-3628-MPRN
Welsh Government Offices Cathays Park
Cardiff
CF10 3NQ
United Kingdom
Region: UKL22 - Cardiff and Vale of Glamorgan
Organisation type: Public authority - central government
Devolved regulations that apply: Wales