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- Detailed land cover map for all of Great Britain
- National French high-resolution land cover map
- Work with multiple features simultaneously in the canvas
- Spill points on flash flood map and depression map
- New surface roughness (Manning) parameters for DynamicFlood
- Workspace and Modelspace sharing updates
- Regionally varying rain in DynamicFlood Sweden
- Veden imeytyminen nyt osana rankkasadeanalyysejä
- Use Scalgo Live anywhere in the world
- DynamicFlood: Live model speed info and regionally-varying rain events
- Sea-level rise: Download building flooding information
- Detailed contour maps and editable buildings in Workspaces
- New in Modelspaces: Explore hydrodynamic simulations and visualise the dynamics of flow velocity
- National German high-resolution land cover map
- Specify basins and protrusions by drawing their outer boundary
- Simplified path features
- National Norwegian high-resolution land cover map
- Organise and communicate on a digital canvas
- New sidebar to help organize your analyses and queries
- Sliding contours
- Ny skyfallsanalys och en ännu bättre marktäckekarta
- New land cover map for Finland
- Depths in the depression map
- New Danish land cover map with more classes
- National Swedish High-Resolution Impervious Surface Mapping
- Watershed tool updated with even better descriptions of catchment characteristics
- National Flash Flood Map with Infiltration and Drainage for Denmark
- Add your own WMS layers to SCALGO Live
- Enriched building data in Denmark
- National hydrological corrections and Land Cover for Poland
- National hydrological corrections for Norway
- Updated Impervious Surface Mapping for Denmark
- National hydrological corrections and updated local data for Finland
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- Importing VASP data
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- Emergency planning with sea-level rise from national forecast data
- Detailed information about watershed composition
- Better styling of imported vector layers
- New Danish Elevation Model
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- Flood risk screening from rivers and flow paths
- New workspace tool: Raise and lower terrain uniformly
- Importing LandXML TINs, LAS point clouds
- New model in Sweden
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- Swedish contour maps
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- New powerful tool for emergency response and coastal flood prevention
- Denmark: New flash flood map
- Sweden: Geodatasamverkan setting for Swedish users
- Import custom terrain models
- New Hydrological Corrections
- Elevation contours now available
- Download orthophotos as JPEG and PNG
- Subsurface structures in workspace
- Sea-levels in terrain profiles
- Updated orthophotos
- Models and analysis update
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- GeoDanmark/FOT data, Matrikelkortet now available
- New flash flood map
- Download of risk polygons
- Updated orthophotos
- Nationwide hydrology on the new DHM/2015 model now available
- New flash flood map computation available with watershed download
- DHM/2015 variants and sea-levels now available nationwide
- DHM/2015 now available nationwide
- Hydrology on the new DHM/2015 model now available
- New DHM/2015 Model - now with buildings
- New DHM Model
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About
Rain Events – Chicago Design Storm
A design rain event is a synthetic rain event created in order to simulate a critical condition for the design of a given structure or measure (e.g. a stormwater drainage system or a culvert). The Chicago Design Storm (CDS) is a widely used method for generating design storms for urban applications. It relies on an analytical curve that is normally fitted to an observed IDF curve, i.e. a curve describing the relationship between Intensity, Duration and Frequency observed in the rainfall record of a local rain gauge with high temporal resolution. For the analytical curve we use the Sherman equation (Sherman, 1931):
![](https://scalgo-web.imgix.net/documentation/Screenshot-2024-09-02-151546.png?auto=compress%2Cformat&crop=focalpoint&cs=srgb&fit=crop&fp-x=0.5&fp-y=0.5&h=74&q=80&w=750&s=2c2fb4e0e64cf8d75fdbd6abd8215759 750w, https://scalgo-web.imgix.net/documentation/Screenshot-2024-09-02-151546.png?auto=compress%2Cformat&crop=focalpoint&cs=srgb&fit=crop&fp-x=0.5&fp-y=0.5&h=99&q=80&w=1000&s=b0073fffe0fdccbdd6e65526faacdb64 1000w, https://scalgo-web.imgix.net/documentation/Screenshot-2024-09-02-151546.png?auto=compress%2Cformat&crop=focalpoint&cs=srgb&fit=crop&fp-x=0.5&fp-y=0.5&h=121&q=80&w=1220&s=b7d75a97f04d3beaada92eef730ea55a 1220w, https://scalgo-web.imgix.net/documentation/Screenshot-2024-09-02-151546.png?auto=compress%2Cformat&crop=focalpoint&cs=srgb&fit=crop&fp-x=0.5&fp-y=0.5&h=121&q=80&w=1219&s=bdaa5469ddfc5fbac43aff719f121147 1219w, https://scalgo-web.imgix.net/documentation/Screenshot-2024-09-02-151546.png?auto=compress%2Cformat&crop=focalpoint&cs=srgb&fit=crop&fp-x=0.5&fp-y=0.5&h=121&q=80&w=1217&s=f6c06079a924dc5f4f4938cc9f4df518 1217w)
Where it is rainfall intensity, t is storm duration, and a, b, and n are coefficients that represent local conditions and the return period. We find these coefficients by fitting the equation to observed IDF-curves using non-linear least squares.
Using these coefficients, we generate CDS events using the following equations for intensities before (2) and after the peak intensity (3):
![](https://scalgo-web.imgix.net/documentation/Screenshot-2024-09-02-152008.png?auto=compress%2Cformat&crop=focalpoint&cs=srgb&fit=crop&fp-x=0.5&fp-y=0.5&h=184&q=80&w=750&s=d93a99aee49a854c15fb6f0774664076 750w, https://scalgo-web.imgix.net/documentation/Screenshot-2024-09-02-152008.png?auto=compress%2Cformat&crop=focalpoint&cs=srgb&fit=crop&fp-x=0.5&fp-y=0.5&h=245&q=80&w=1000&s=964d93cd1b3e91872db94baa69cd2235 1000w, https://scalgo-web.imgix.net/documentation/Screenshot-2024-09-02-152008.png?auto=compress%2Cformat&crop=focalpoint&cs=srgb&fit=crop&fp-x=0.5&fp-y=0.5&h=302&q=80&w=1230&s=ab9067ea73108a30a9a3cec29aa3e4a2 1230w, https://scalgo-web.imgix.net/documentation/Screenshot-2024-09-02-152008.png?auto=compress%2Cformat&crop=focalpoint&cs=srgb&fit=crop&fp-x=0.5&fp-y=0.5&h=302&q=80&w=1231&s=16f897ac874e0b90eed054d83ca8d673 1231w)
Where t1 and t2 represent the time from peak intensity (considered here as time zero) and γ is the peak-time ratio (which controls when the peak occurs during the rain event).
Our CDS-events are constructed using a peak-time ratio of 0.5 (i.e. the peak intensity occurs at the middle of the event), the time steps are 5-10 minutes long, and the standard duration is 4 hours.