PNW_SDAM Final data

Hydrological, biological, and geomorphological dataset collected from the Pacific Northwest (PNW = Oregon, Idaho, and Washington) used to develop the Oregon (OR) Streamflow Duration Assessment Method (SDAM) and the PN SDAM. SDAMs are rapid, reach-scale indices or models that use physical and/or biological indicators to predict flow duration class. Three flow duration classes are used in the OR and PNW SDAMs: perennial, intermittent, and ephemeral. Perennial reaches have continuous surface flow and do not experience drying outside of extreme drought. Intermittent reaches have continuous surface flow for part of the year that is sustained by snowmelt and/or groundwater. Ephemeral reaches have surface flow only during and immediately following precipitation or snowmelt

本数据集汇聚了太平洋西北地区（PNW，涵盖俄勒冈州、爱达荷州和华盛顿州）的水文、生物和地貌数据，旨在构建俄勒冈州（OR）河流流量持续时间评估方法（SDAM）及太平洋地区SDAM。SDAM为一种快速、适用于河段尺度的指标或模型，通过物理和/或生物指标预测流量持续时间类别。在OR和PNW的SDAM中，采用三种流量持续时间类别：常年河流、间歇河流和季节性河流。常年河流具有持续的水面流动，且在极端干旱之外不会出现干涸现象。间歇河流在部分年份内具有持续的水面流动，由融雪和/或地下水维持。季节性河流仅在降水或融雪期间及其紧随之后才有水面流动。