District boundary and HAND risk overlay (0-20 m above the nearest river) over the OpenStreetMap basemap — individual buildings are visible in the basemap itself. Areas over 20 m are left uncolored (safe).
Share of each building type's buildings falling in every height band (100% per row) — row totals in parentheses.
This page shows a rapid assessment done with open source data about the distribution of buildings in relation to the height of the nearest river. Buildings are mapped according to five different categories: buildings that are within 5m from river level, then 10m, 15m and 20m. The charts below show the distribution of buildings according to their function (as mapped on OpenStreetMap). At the top there are 3 other pages that focus on single districts, hospitals and schools.
Each district shaded by what fraction of its buildings sit in the highest-risk band — darker red means a larger share.
Share of each building type's buildings falling in every height band (100% per row) — row totals in parentheses.
All 77 districts, ranked by the share of their buildings within 0-5 m of the nearest river (highest first) — row totals in parentheses.
Hospitals, clinics, pharmacies, dentists and other health facilities — the building type where flood exposure most directly threatens emergency response and continuity of care. Nationwide, all 77 districts.
Each dot is one facility's location (from OpenStreetMap), colored by its height above the nearest river.
Ranked by count — stacked by height above the nearest river.
Districts with at least one health facility, ranked by count — stacked by height above the nearest river.
Schools, colleges, universities and kindergartens — the building type where flood exposure most directly threatens continuity of education. Nationwide, all 77 districts.
Each dot is one school's location (from OpenStreetMap), colored by its height above the nearest river.
Ranked by count — stacked by height above the nearest river.
Districts with at least one school, ranked by count — stacked by height above the nearest river.
Given the risk of flooding events in Nepal, this project aims at having a better understanding of the spatial distribution of buildings in relation to relative height from nearby river. It uses open source datasets from Open Street map and Copernicus 30m. The analysis now covers all 77 districts of Nepal.
Building data extracted from Open Street Map, DEM elevation extracted from Copernicus/GLO30 Height Above Nearest Drainage (HAND) computed using the PCRaster package in QGIS. The HAND values are then aggregated to the district level and visualized in this dashboard. Final scripting and dashboard built using JavaScript, Leaflet,D3.js and Claude Code.
Please keep in mind that the HAND is a simplified representation of the true flood risk and should be used in conjunction with other data and expert knowledge. The dataset is created with an initial resolution of 30m, this will be reflected in the uncertainty attached to the estimates. Open Street Map data is used for building footprints and function.