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CONUS NG-IDF Data Sets

The NG-IDF datasets, spanning 1951‒2013, characterize the magnitude, trend, seasonality, and driving mechanism of extreme events relevant to hydrologic design for over 200,000 locations across the CONUS at a 1/16th-degree resolution. These datasets enhance traditional precipitation-based intensity-duration-frequency curves (PREC-IDF) by accounting for total water reaching the land surface from rainfall, snowmelt, and rain-on-snow (ROS), i.e., Next-Generation intensity-duration-frequency analysis (NG-IDF).PREC-IDF's neglect of snow processes can lead to significant biases in extreme event analysis, especially in snowy regions. NG-IDF addresses this by including snow processes, providing a systematic and consistent technique for all environments from rain-dominated, transitional, to snow-dominated locations. The resulting datasets are spatially continuous, and readily usable for supporting site-specific infrastructure design and for assessing the potential biases and design risks related to the use of PREC-IDF. Abbreviations:<blockquote>P = PrecipitationR = RainfallROS = Rain-on-snowM = Snowmelt W = Water reaching the land surface from rain, snowmelt, and ROS events</blockquote> Classification of Driving Mechanism for Extreme W Events:For each location, the driving mechanism was determined for extreme W events with different durations and return periods, following the classification criteria as follows:<blockquote>Rainfall (R): precipitation on snow-free ground; Snowmelt (M): decreasing SWE, daily rainfall < 10 mm, and the sum of rainfall and snowmelt has < 20% contribution from rainfall.Rain-on-snow (ROS): decreasing SWE with at least 10 mm of daily rainfall falling on a snowpack with at least 10 mm daily SWE, and snowmelt contributes at least 20% of the total of rain and snowmelt</blockquote> The datasets include:Note: In data format description, C = column, R = row, C[i] indicates the ith column of a data file. All data files are prepared in comma-separated value (.csv) format.<ul><li>list.csv<ul><li>Description: The geographic coordinates and cluster ID (used for snow parameterization) of 207,173 locations over the CONUS</li><li>Data Dimension: 207,173 (R) x 3 (C)</li><li>Format: C1: Latitude; C2: Longitude; C3: cluster ID (ranging from 1‒5)</li></ul></li></ul> <ul><li>AMF_WY/<ul><li>Description: Annual maximum series with durations of 24h, 48h, and 72h, driven by different hydrometeorological mechanisms over water years 1951‒2013 (10/1/1950-09/30/2013). The mechanisms include W, P, R, ROS, and M.</li><li>Subfolder/File Naming Convention: [duration]/[mechanism].csv, e.g., 24h/W.csv</li><li>Data Dimension: 207,173 (R) x 65 (C)</li><li>Unit: mm</li><li>Format: C1: Latitude; C2: Longitude; C3‒C65: maximum value for each year from 1951-2013</li></ul></li></ul> <ul><li>AMF_CY/<ul><li>Description: Annual maximum series with durations of 24h, 48h, and 72h, driven by different hydrometeorological mechanisms over calendar years 1950‒2012 (1/1/1950-12/30/2012). The mechanisms include W, P, R, ROS, and M.</li><li>Subfolder/File Naming Convention: [duration]/[mechanism].csv, e.g., 24h/W.csv</li><li>Data Dimension: 207,173 (R) x 65 (C)</li><li>Unit: mm</li><li>Format: C1: Latitude; C2: Longitude; C3‒C65: maximum value for each year from 1950-2012</li></ul></li></ul> <ul><li>IDF/<ul><li>Description: Discrete IDF values, i.e., the magnitude of extreme events with durations of 24h, 48h, and 72h, driven by different hydrometeorological mechanisms. The mechanisms include W, P, R, ROS, and M.</li><li>Subfolder/File Naming Convention: [duration]/[mechanism].csv, e.g., 24h/W.csv</li><li>Data Dimension: 207,173 (R) x 9 (C)</li><li>Unit: mm</li><li>Format: C1: Latitude; C2: Longitude; C3‒C9: IDF values for the return period of 2, 5, 10, 25, 50, 100, and 500 years. NaN indicates no runoff caused by a given mechanism, such as ROS.</li></ul></li></ul> <ul><li>IDF_90CI/<ul><li>Description: 90% C.I. for IDF values in the IDF/ folder described above</li><li>Subfolder/File Naming Convention: [duration]/[mechanism]_H.csv, e.g., 24h/W_H.csv<ul><li>Data Dimension: 207,173 (R) x 9 (C)</li><li>Unit: mm</li><li>Format: C1: Latitude; C2: Longitude; C3‒C9: 95% quantile for IDF values with the return period of 2, 5, 10, 25, 50, 100, and 500 years. NaN indicates no runoff event caused by a given mechanism.</li></ul></li><li>Subfolder/File Naming Convention: [duration]/[mechanism]_L.csv, e.g., 24h/W_L.csv<ul><li>Data Dimension: 207,173 (R) x 9 (C)</li><li>Unit: mm</li><li>Format: C1: Latitude; C2: Longitude; C3‒C9: 5% quantile for IDF values with the return period of 2, 5, 10, 25, 50, 100, and 500 years. NaN indicates no runoff event caused by a given mechanism.</li></ul></li></ul></li></ul> <ul><li>trend/<ul><li>Description: Sen's slope of Mann-Kendall trend in annual maximum series driven by different hydrometeorological mechanisms over water years 1951‒2013. The mechanisms include W, P, rainfall (R), ROS, and snowmelt (M).</li><li>Subfolder/File Naming Convention: [duration]/[mechanism].csv, e.g., 24h/W.csv</li><li>Data Dimension: 207,173 (R) x 3 (C)</li><li>Unit: mm/year</li><li>Format: C1: Latitude; C2: Longitude; C3: Trend indicated by Sen's slope. The value is zero if the trend is not statistically significant.</li></ul></li></ul> <ul><li>Driver/<ul><li>Description: Dominant driving mechanism of extreme W events with different durations and return periods</li><li>Subfolder/File Naming Convention: [duration]/[return period].csv, e.g., 24h/50y.csv</li><li>Data Dimension: 207,173 (R) x 3 (C)</li><li>Format: C1: Latitude; C2: Longitude; C3: Dominant driver IDs (1=R, 2=ROS, 3=M).</li></ul></li></ul> <ul><li>risk/<ul><li>Description: Design risk associated with PREC-IDF estimated 100-year extreme events</li><li>Subfolder/File Naming Convention: [duration]/100y.csv, e.g., 24h/100y.csv</li><li>Data Dimension: 207,173 (R) x 3 (C)</li><li>Unit: %</li><li>Format: C1: Latitude; C2: Longitude; C3: Bias in the 100-year event based on PREC-IDF vs. NG-IDF</li></ul></li></ul> <ul><li>SI/<ul><li>Description: Seasonality of annual maximum W events with 24-, 48-, and 72-h durations over water years 1951‒2013</li><li>Subfolder/File Naming Convention: [duration]/W.csv, e.g., 24h/W.csv</li><li>Data Dimension: 207,173 (R) x 4 (C)</li><li>Format: C1: Latitude; C2: Longitude; C3: Mean data (=1 if Oct 1); C4: Seasonality index ranging from 0 to 1</li></ul></li></ul>

ShareScore

36/100

Overall dataset sharing score

Score breakdown

These five areas show where the dataset supports — or may limit — practical reuse.

Stewardship: 8
Harmonization: 4
Access: 16
Reuse readiness: 8
Engagement: 0

Topics

IDF Curves hydrologic design extreme events CONUS