In the previous post I showed that the main reason for flooding in St Helena is its location in the low-lying terrain between the Caroni and Guayamare Rivers. This post will explore one option of flood mitigation in the area – levees. Levees have been used for centuries to protect areas against flooding. Portions ofContinue reading “St Helena Trinidad, Flood Mitigation Option #1: Levees!”
Author Archives: Pink Wombat
St Helena Trinidad, Flooding Causes
In a previous post I showed a hypothetical floodplain map of St Helena, Trinidad. This is a lot of flooding! St Helena is one of those areas that are notorious for flooding whenever rain starts to fall in the area. But why? The answer is mainly its location. St Helena lies between two rivers: CaroniContinue reading “St Helena Trinidad, Flooding Causes”
Caroni River Basin 2D HEC-RAS Model Overview
I had a request to see the model that I used to create the floodplain map for St Helena in my last post. I used RAS 6.6 to develop the model along with all the inputs I described in my previous posts: Terrain, Land Cover, and Soils. Here is a brief overview of the model.Continue reading “Caroni River Basin 2D HEC-RAS Model Overview”
St Helena – Trinidad Floodplain Map
Let’s talk about floodplain maps. Floodplain maps have many uses, including guiding development and zoning, identifying the most vulnerable areas for emergency preparedness and response, analyzing property risk, and water resources management. Here is a hypothetical floodplain map of St Helena, Trinidad. If you have been following along with all of my mapping posts soContinue reading “St Helena – Trinidad Floodplain Map”
Maracas Watershed 3D Map – Take 2
I wanted to revisit the 3D map of the Maracas watershed I did a few weeks ago, but this time using the Shaded Relief symbology that I experimented with. This map uses the default hillshade parameters. It wasn’t necessary to accentuate the vertical features as this is a more localised area. This map shows theContinue reading “Maracas Watershed 3D Map – Take 2”
Hillshade Testing
When I was putting together the map showing the Topography of the Caroni River Basin, I go up to speed on 3 important parameters when generating a Hillshade: Z Factor, Azimuth, and Angle. Here is a quick comparison of these factors. The Z factor is used to exaggerate the vertical features of the terrain byContinue reading “Hillshade Testing”
Caroni Watershed Topography
A map showing the topography of the Caroni River Basin. Topography is the study of the land surface, which includes its physical features such as hills and valleys. This one isn’t too bad and I learnt a few things about hillshade which I will hopefully share in a future post. The purpose of this mapContinue reading “Caroni Watershed Topography”
Caroni River Basin Soil Map
A Soil Map of the Caroni River Basin in Trinidad The purpose of this map is to show the soil textures in the Caroni River Basin. The dataset source is here: https://www.arcgis.com/home/item.html?id=1b97fe85db144d19ae71b60fa1bbf6ef which appears to be linked to this study: https://sta.uwi.edu/ffa/sites/default/files/ffa/USDA%20soil%20Taxonomy%20Upgrade-Trinidad%20and%20Tobago.pdf Similar to the Land Cover Map, I had to dumb down the data aContinue reading “Caroni River Basin Soil Map”
Caroni River Basin Watersheds
A closer look at the watersheds within the Caroni River Basin This is just a zoomed in version of the full Watersheds map https://trinimapping.home.blog/2025/01/11/trinidad-watershed-map/. The full dataset can be viewed here: https://codepen.io/leelum1/full/yQbBBr. The purpose of this map is to show the Caroni River basin in greater detail, along with the main rivers in each watershed.Continue reading “Caroni River Basin Watersheds”
Trinidad Land Cover
A Land Cover map of Trinidad This dataset is sourced from: https://data.fs.usda.gov/geodata/rastergateway/caribbean/index.php. Obviously the major land cover is trees. I simplified the dataset as I didn’t think I need to post every single type of tree in the forest. The original dataset is pretty detailed, and free! (Which is no surprise as its from aContinue reading “Trinidad Land Cover”
Mapping T&T 