Sustainable yield study based on pumping test data, Stabio (TI, CH)

PURPOSES

The Municipality of Stabio intends to extract water for thermal use (district heating) and re-inject it into the aquifer. Two test wells, P1 and P2, have been drilled, with flow rates of up to 1000 l/min for well P1 and 700 l/min for well P2. In well P1, the aquifer is under pressure, while in P2 it is not. The Municipality of Stabio aims to reach a pumping rate of between 3,000 and 4,000 l/min.

CLIENT

GEOLOG.CH, 2024.

WHAT WE DID

A 3D model was built, calibrated using the recorded data from the pumping tests, and then used to simulate scenarios with increased pumping rates by a factor of 4. A new well geometry, with wells of 800mm in diameter, was also tested. The simulations provided insights into the radius of influence and the corresponding drawdown for these scenarios.

Dewatering of Hassyan IWP construction site (UAE)

PURPOSES

Hassyan seawater reverse osmosis (SWRO) independent water project (IWP) is a major proposed water supply project to serve the Emirate of Dubai in the UAE.  The proposed pumping station for the project requires a deep excavation (about 14 m depth), which in turn will need dewatering of groundwater during excavation.  The pumping station position close to the coastline, which incorporates a Ramsar site, has prompted the need for a groundwater model, to understand impacts on nearby sensitive ecological receptors.

CLIENT

Aquageo International Consultancy, 2024.

WHAT WE DID

We enabled a realistic and dependable dewatering impact assessment of construction on groundwater levels at the sensitive habitat using a working 3D hydrogeological numerical model approach.

Dewatering works for the amplification of the sewage treatment plant “IDA-Giubiasco” (TI, CH)

PURPOSES

CLIENT

GEOLOG.CH, 2024.

WHAT WE DID

We enabled realistic and dependable assessment of dewatering needs (pumping rates volumes) to model and cross-compared various scenarios using a working 3D hydrogeological numerical model approach. A solution combining  a pumping system, such as dewatering pumps, at the bottom of the excavation pit and “sheet piles” around the excavation pit has been studied.

Dewatering works for the amplification of the sewage treatment plant “IDA-Vacallo” (TI, CH)

PURPOSES

CLIENT

GEOLOG.CH, 2024.

WHAT WE DID

We enabled realistic and dependable assessment of dewatering needs (pumping rates volumes) to model and cross-compared various scenarios using a working 3D hydrogeological numerical model approach. The following 4 solutions have been simulated:

CASE 1: Pumping system, such as dewatering pumps, at the bottom of the excavation pit.
CASE 2: Pumping system, such as dewatering pumps, at the bottom of the excavation pit, and “jetting columns” around the excavation pit.
CASE 3: Pumping system, such as dewatering pumps, at the bottom of the excavation pit, with secant piles along the road to block water along the river axis.
CASE 4: System of 23 wells with “deep wells” type pumps along the road to block water along the river axis.

Dewatering of “Stazione di pompaggio-ARM” (TI, CH)

PURPOSES

Estimation of dewatering rates of the construction site that requires dry conditions. 

CLIENT

GEOLOG.CH, 2023.

WHAT WE DID

We enabled realistic and dependable assessment of dewatering needs (pumping rates volumes) to model and cross-compared various scenarios using a working 3D hydrogeological numerical model approach.

Dewatering of the Island construction site (UAE)

PURPOSES

The internal dewatering of the Island construction site, required to enable a dry excavation, has encountered issues related to the amount of water to dewater, which continued for longer than anticipated, and at higher rates.

In August 2020 a first review demonstrated that various factors have led to very significant increase in dewatering volume during execution of the works compared to those that were expected and had been budgeted for at the time of the tender.

CLIENT

Besix Construction, 2020.

WHAT WE DID

We enabled realistic and dependable assessment of dewatering needs (pumping rates volumes) to model and cross-compared various scenarios using a working 3D hydrogeological numerical model approach and proposed an indicative well field design.