https://videos.qwast-gis.com/videos/watch/59dc11ff-d1c8-49fa-8ea3-93de5da43feb This video introduces a custom QGIS Processing Script designed to automatically delineate headwater catchments up to a specified maximum size. The tool identifies small upstream basins using a Strahler stream order threshold derived from a raster Strahler order map. By combining hydrological logic with PCRaster functions, it provides a fast and reproducible workflow for pinpointing the smallest contributing catchments in a river network. 💡 Why This Tool Is Useful Headwater catchments are critical zones for: Water management and conservation, Erosion and sediment control, Flood mitigation planning, Nature‑based solutions and upstream interventions, Hydrological modelling workflows, Small upstream basins often have outsized influence on downstream water quality and flow dynamics. This script makes it easy to identify and map these sensitive areas, supporting evidence‑based decision‑making in hydrology, environmental management, and spatial planning. 0:00 Introduction to the QGIS Resources Hub 0:29 QGIS Processing Scripts 0:41 The Headwater Catchments Processing Script explained 2:09 Install the QGIS Hub plugin 2:27 Add a Processing Script to QGIS 2:56 Use the Headwater Catchments tool 3:47 Check the results Wed, 29 Jul 2026 11:13:57 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://videos.qwast-gis.com https://videos.qwast-gis.com/lazy-static/avatars/b67f5a64-f395-4e3b-beec-2ed3d3c795b7.png https://videos.qwast-gis.com/videos/watch/59dc11ff-d1c8-49fa-8ea3-93de5da43feb All rights reserved, unless otherwise specified in the terms specified at https://videos.qwast-gis.com/about and potential licenses granted by each content's rightholder.