Hydrological and hydraulic surveys for photovoltaic plants.
During the initial phase, calculations are made, and the relevant hydrological and hydraulic models are generated in accordance with the available basic data.
Historical data relating to precipitation, hydrographic basin (drainage basin) and gathering flood-risk data
- Compiling, evaluating, and preparing topographical, hydrological, land use, geological, and meteorological (rainfall) data which is publicly accessible.
- Collecting historical flood data about the area which is the object of the survey.
- Identifying possible flood risks or problems (which events are relevant, and which are not) due to rainstorms and main local rivers.
GMS Internacional can gather information from IDF curves for its calculations. In the absence of this information, it also feasible to provide this data by using other sources, such as adjacent fields of research or making assumptions based on experience. All possible discharge points for estimated rainwater within the drainage system and its discharge area will be identified and agreed with the client. We can estimate the maximum flow for these discharge points based on different equations normally used for the design of rainwater drainage systems or small basins.
This research gives us the maximum flow for each predefined discharge point for the duration of the precipitations and for the required return periods (for example, 25 and 100 years).
Hydraulic modelling and flood risk assessment
We will then use models based on the programs ArcGIS, HEC-Ras, HEC-RAS 2D, and eventually HEC-HMS (SCS), by which we calculate the maximum flow, the extent of the flood surface, and the resulting water levels and velocity on the area (topography). Flood maps are generated for different return periods. The water surface can be identified by intersecting it with the MDT model.