![]() LiDAR data is typically available in either DTM (Digital Terrain Model) or DSM (Digital Surface Model) forms. Produced by an aircraft mounted LASER which is directed onto the ground and the reflected light is analysed by computer to produce a rectangular grid of x, LiDAR stands for Light Detection and Ranging. In addition to topographical surveys, a further source of ground level information is LiDAR data. Survey and if required, we can plan, organise and supervise this as part of our service. These are often obtained by carrying out a topographical Hydrological assessment of the watercourse.įurther input data required includes cross-sections and levels along the watercourse channel. We can use Flood Modeller Pro, TUFLOW (ESTRY) or HEC-RAS software for the 1D modelling of watercourses including the associated structures such as culverts, bridges and weirs.Ī river modelling study will often use flow hydrographs produced by a Watercourse while in 2D flood modelling the water can flow in any direction across the ground surface. So for 1D modelling the water flows in one dimension along the The use of 1D and 2D, in terms of river and flood modelling, refers to the flow of water. In broad terms there are three approaches to flood modelling, these are 1-Dimensional (1D) river modelling, 2-Dimensional (2D) flood modellingĪnd a combination of the two approaches (linked 1D - 2D flood modelling). TUFLOW river modelling, Ystradgynlais and In connection with proposed new developments, see ![]() Much of the river modelling work we undertake is We undertake hydraulic river modelling using Flood Modeller Pro (formerly ISIS), TUFLOW or HEC-RAS software.
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