Tandcove’s dedicated Geologists and engineers have experience in providing detailed hydrological assessments, which are carried out as part of the flood risk, and drainage assessments. These use a combination of topographical information, site investigations, hydrological data, and more.

Hydrology is the study of the amount and quality of water being stored or conveyed on the land surface, and in soils and rocks near the surface. The hydrological response of a catchment is controlled by a combination of climate, vegetation, drainage, soils and land use.

Tandcove’s dedicated Geologists and engineers have experience in providing detailed hydrological assessments, which are carried out as part of the flood risk, and drainage assessments. These use a combination of topographical information, site investigations, hydrological data, flow surveys, rainfall data, geological information and other historic data to determine the extent of catchment areas contributing runoff, and the flows in watercourses and drainage systems.

General Scope of Work

Tandcove will carry out or procure a hydrological study to produce the necessary inputs for accurate and binding EPC and Operation and Maintenance quotations. The purpose of the hydrological assessment is to determine ground water availability and assess the flood risk of the site. The ground water study will inform the availability and quality of water for construction and operation periods including the suitability of water for module washing. The flood risk assessment will inform the project layout, drainage infrastructure and storm water management plan. All local results must be based on the output and reference system of the topographic survey.

Tandcove will conduct a two-phase ground water survey:

Phase 1: Desktop feasibility assessment using existing maps and studies to determine:

1. The existence of ground water resources within the vicinity (less than 10km) of the site;
2. Estimated sustainable flow rates;
3. Seasonal and long-term effects on water resources;
4. The likely chemical composition and pH of the water; Depth of water resources; and Existing infrastructure to extract the water resources.

Phase 2: Onsite pumped assessment:

Should feasible ground water resources be identified, onsite pumped tests will be conducted to confirm sustainable flow rates and water chemistry. These tests will be agreed after the completion of Phase 1. Tandcove is to provide capabilities and indicative costs of conducting pumped tests.

Tandcove will determine and assess flood risks associated with:

1. Rainfall;
2. Surface flows (occurring onsite and upstream);
3. Ground water flows;
4. Seasonal and long-term affects;
5. Behaviour of aquifers;
6. Water stagnation;
7. 1:10 and 1:100 -year flood lines; and
8. Any potential risk to arise from the study.

Deliverables

Tandcove will produce:

1. A map of flood features identified above to be referenced according to the topographic study;
2. A risk assessment study describing:

a. All methods, sources and assumptions used to determine the above and recommendations in terms of flood management solutions;
b. Recommended flood mitigation methods and infrastructure;
c. Contribution of flooding to the environmental impact of the Project in relation to the environmental management plan; and
d. Impact on the design considerations of the project.

3. A map of the site showing depth and velocity of flow.