Introduction
This site was designed to identify estimates of projected changes in extreme rainfall in the Delaware River Basin. Through the interactive tool, users can see estimated Intensity-Duration-Frequency (IDF) curves for a 24-hour duration, based on changing four factors: 1) county, local or watershed (HUC 12) scale; 2) low or high emission scenarios; 3) current or future time period; and 4) annual exceedance probability (frequency of exceedance). By sharing this information in a user-friendly tool, the DRBC is providing local officials, policymakers, planners, and developers, as well as Basin residents, with science-based knowledge to understand expected climate-induced precipitation changes and inform adaptation decisions.
Choosing Options
The map will automatically update after any option is changed.
Select By: Changes the selectable areas on the map. If you have a location selected and change this option the tool will automatically determine the new area that should be selected based on the pin location.
Emission Scenario: Changes the projection between low emission future (Representative Concentration Pathway 4.5) and high emission future (Representative Concentration Pathway 8.5).
Time Period: Changes the projection time period.
Annual Exceedance Probability: Changes the probability of exceedance.
Changing Tabs
Clicking on the tabs above will change the content displayed in this box.
User Guide: Displays the current content.
IDF Curve: After selecting a location on the map this tab displays the IDF curve chart as well as a table of the data displayed in the chart.
About the Data: A description of the data source.
Selecting Location
Click on the map within a colored region at your desired location. The selected area will be highlighted by an orange border and the map will zoom and/or pan to the selected location. A 'Reset Zoom' button will appear to allow you to return to the original view.
The tab will automatically change to 'IDF Curve' and will display the IDF curve chart for the area that you selected.
A new table will populate at the bottom of the map and dislay the change factors for the area that you selected.
Adding Confidence Intervals to the Chart
Hovering your cursor over any of the confidence interval toggles will display what each toggle is for. Clicking on a toggle will add or remove that confidence interval in the chart and data table. Only the intervals that are turned on will be included in your file downloads.
Downloading Data/Chart
Once you have selected a location, go to the 'IDF Curve' tab. Here you will find the download buttons below the chart and left of the confidence interval toggles.
On a large screen: Simply click button for the desired file type to download it.
On a small screen: Click the button with the download icon, then click the button for the desired file type to download it.
NOTE: The 'Excel' file will contain data in a table, but will not include the IDF curve chart. The 'PDF' file will contain both the data and the IDF curve chart.