| | Tier 1 | Tier 2 | Tier 3 |
|---|
Resulting information | Floodplain “at risk” on catchment scale | Floodmap for floodplain downstream of observation. (accuracy depends largely on bankful estimate and model accuracy) | Urban floodmap with estimate of uncertainty in flood extent. Accuracy depends on exact observations locations and DTM, but estimate of uncertainty given. |
Other data requirements | DEM with ~500m resolution (e.g. hydrosheds; available from 56 degree South and 60 degrees north) | - water levels from observation or simulation
- DEM with <500m resolution (e.g. hydrosheds / SRTM; available from 56 degree South and 60 degrees north)
| - High res DTM ~25m (free availability depends on the country)
|
Topographical area of applicability | - fluvial floods (based on HAND)
- Based on the event location(s) we can include downstream cities but not exclude upstream cities
- not if terrain too flat (define slope)
| - fluvial floods for larger rivers (based river water levels)
| - pluvial, fluvial and coastal floods
|
Preparation | - Deriving global HAND contours
| - Setting up a hydrological model or harvesting water level measurements
- prepare downstream floodplain domain
| - Preparing DTM
- for deterministic maps: pre-calculate DTM uncertainty
|
Run time | - seconds for cropping of pre-calculated hand contour maps to downstream cells from location
- seconds for selection of most appropriate contour may take time
| - seconds for determining bankful capacity map
- minutes for running FloodMapper tool
| Depends on extent of domain: - minutes deterministic floodmap
- hours for probabilistic floodmap
|
