Peak Timing of Runoff (1985 to 2020) Summarized within Global Watershed Basins

Data associated with manuscript: Historical Trends in Snowmelt Used for Irrigation by Kinnebrew et al., 2025, <i>Environmental Research: Food Systems </i>(https://doi.org/10.1088/2976-601X/adacec).These data represent the temporal mass center of runoff, or peak runoff timing, for each year (1985 to 2020) and within each watershed basin (HydroBASINS level 3; https://www.hydrosheds.org/products/hydrobasins). The data were summarized from snowmelt, rainfall and total runoff data from TerraClimate (https://doi.org/10.5061/dryad.vx0k6dk2h). Please see the manuscript methods for additional information.<b>Column Names and Descriptions:</b>1. <b>watershedNum:</b> the HUC12 identifier number from HydroBASINS level 32. <b>year:</b> data year, from 1985 to 20203. <b>CT_Snow: </b>the month in which the mass center of snowmelt runoff occurred. Values correspond to month and day (see note below)4. <b>CT_Rain: </b>the month in which the mass center of rainfall runoff occurred. Values correspond to month and day (see note below)5. <b>CT_Total: </b>the month in which the mass center of total (snowmelt and rainfall) runoff occurred. Values correspond to month and day (see note below)<br><b>Converting values to month and day: </b>The whole number corresponds to the month (1: January, 2: February, 3: March, etc.). The fraction can be converted to the day of the month by multiplying it by the number of days in the month. A value of 1.3 would correspond to January 9, or a value of 9.7 would correspond to September 21.

本数据集关联论文：Kinnebrew等（2025）发表于《Environmental Research: Food Systems》的《Historical Trends in Snowmelt Used for Irrigation》（DOI: 10.1088/2976-601X/adacec）。
本数据集涵盖1985年至2020年每年、每个三级HydroBASINS流域（来源：https://www.hydrosheds.org/products/hydrobasins）的径流年时间质心，即径流峰值出现时间。
本数据集基于TerraClimate（DOI: 10.5061/dryad.vx0k6dk2h）的融雪、降雨及总径流数据汇总得到，详细信息请参阅论文方法部分。
<b>字段名称及说明：</b>
1. <b>watershedNum：</b>三级HydroBASINS的HUC12标识符编号
2. <b>year：</b>数据年份，范围为1985年至2020年
3. <b>CT_Snow：</b>融雪径流时间质心出现的月份，数值包含月份与日期信息（详见下文说明）
4. <b>CT_Rain：</b>降雨径流时间质心出现的月份，数值包含月份与日期信息（详见下文说明）
5. <b>CT_Total：</b>总径流（融雪与降雨径流之和）时间质心出现的月份，数值包含月份与日期信息（详见下文说明）
<b>数值转月日格式说明：</b>
数值的整数部分代表月份（1对应1月、2对应2月、3对应3月，依此类推）；小数部分乘以当月天数即可得到具体日期。例如，数值1.3对应1月9日，数值9.7对应9月21日。