The groundwater resources of Samoa are variable and complex; some recharge and in certain cases even entire rivers, infiltrate rapidly into the ground through lava tubes. The national LiDAR survey enabled rapid identification of lava tube collapses (vertical depressions in the lava fields) using modelling techniques.

This figure details a cross-section of the top of dam crest profile and adjacent topography. Also shown are images detailing the dam crest.

Inundation modelling is necessary for the development of EAPs (emergency action plans). The dam break analyses conducted informs what structures and land parcels are under threat of inundation based on each dam break scenario. The EAP drawing details areas under risk of flooding, flood velocities at points of interest and peak stage arrival times from start of rainfall events. All are packaged here in an easy to decipher map that should inform emergency response.

This figure details watershed catchments derived off a Digital Elevation Model (DEM) for the Lake Asbury Dam area. A system of reservoirs feeding into one another, deriving the catchments feeding each separate system was important to inform flood modelling works where designing scenarios where only one dam broke or caused the collapse of a dam further downstream.

Components of a larger surface water management scheme conceptual design proposed to mitigate impacts related to on-site surface water run-off generated during the temporary works construction period of the HS2 railway. Ponds are strategically placed in each of the water management zones that combined form the temporary works area of the Project. Surface water run-off from the water management zones is stored, managed, and treated in the ponds before discharged at consented locations. The surface water management scheme conceptual designs…

Analysis of runoff routing derived from a 1m resolution Digital Elevation Model (DEM) to identify where major watercourses require protection from turbid water ingress from the Project area. Together with other multidisciplinary analyses that form the approach to surface water management for the Project, these results were a key element to support client applications to the Environmental Agency to successfully obtain surface water consents to enable the construction of temporary roads for HS2.

Low-lying 25cm to 50cm bunds/embankments were used to pond rainfall run-off to depths favoured by the West Indian Whistling Duck for foraging, and to increase the moisture content more generally. The rainfall ponded areas and depths for the 25cm bunds/embankments are shown in the drawing for the micro-catchments located around the Royal Palm Reserve.

The depressions in the Digital Elevation Model (DEM) would be filled during rainfall events and as such were identified to calculate the existing natural storage within the Morass. This drawing essentially shows the location and depth of water of naturally ponding water in the Morass following heavy and/or prolonged rainfall.

Geophysical survey of a southern limb of a anticline which marks the northern perimeter of the Bride Valley, Cork. The survey deployed to identify suitable locations for property development based on bedrock integrity and proximity to a GW supply.

Geophysical survey of a the southern limb of a anticline which marks the northern perimeter of the Bride Valley, Cork. Multiple surveys were deployed to establish the lateral extent of competent bedrock units which would be suitable for property development.

LiDAR data manipulation in Kingston, Jamaica to showcase hydrological features.

Case study undertaken to showcase the functionality of the Hotspot risk modelling toolset developed for the Jamaica National Risk Information Platform (NRIP).

Review of the Digital Elevation Model (DEM) revealed that certain elevations were in fact vegetation canopy and not ground surface, and consequently the DEM was zoned into areas that were considered ‘reliable’ and those that were considered ‘zones of uncertainty’, within which rainfall-run-off modelling could not be considered to be accurate.