Hydrology & Hydraulics assessment for PV and BESS

For the expansion of a PV and BESS project in Germany, OrbisTerrarum updated the hydrological and hydraulic assessment prepared for the original plant.

Regional and detailed topography were combined with catchment and rainfall analysis to develop a 2D HEC-RAS model. Simulations covered return periods from 25 to 500 years.

The 100-year scenario showed low flood and erosion risk across most of the site. One localised depression in the PV area reached a maximum water depth of 0.60 m, above the 0.50 m assessment threshold. Flow velocities remained low, at up to 0.40 m/s, while the BESS area stayed below all thresholds.

The results informed clear design measures: avoid construction within the depression, raise ground levels locally where required, and locate inverters and transformer stations outside the affected area.

Orbis Terrarum’s Hydrology & Hydraulics team turns modelling results into practical layout and mitigation criteria for renewable-energy projects.

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