Watershed boundaries for the Puget Sound Stormwater Action Monitoring small stream status and trends project

Stormwater Action Monitoring (SAM) is a collaborative monitoring program between western Washington municipal stormwater permittees, state and federal agencies. SAM’s role is to use the results of regional monitoring and focused studies to inform policy decisions and identify effective strategies to improve stormwater management in the Puget Sound region. The SAM program includes status and trends monitoring of water quality, stream biota (macroinvertebrates, algae), and stream habitat to measure whether conditions are getting better or worse and identify patterns in healthy and impaired Puget Lowland streams. To meet this objective, a framework of fundamental geospatial data was required to develop physical and anthropogenic characteristics of the study region, sampled sites and corresponding watersheds, and riparian zones. This dataset represents the watershed boundaries for the 105 sites sampled for the SAM small stream study, and is one of the four fundamental geospatial data layers that were developed for this study. In addition, watershed boundaries for 16 reference sites in the Puget lowlands sampled by the Washington State Department of Ecology’s Ambient Biological Monitoring program from 2010 to 2015 were included in this analysis to provide a regional context for the SAM study. In total, watershed boundaries for 121 total sites are provided in this data release.

雨水行动监测（Stormwater Action Monitoring, SAM）是由华盛顿州西部市政雨水许可持有者、州级与联邦机构联合发起的协作式监测计划。SAM的核心目标是依托区域监测与专项研究成果，为普吉特湾（Puget Sound）地区的政策制定提供决策支撑，并筛选可有效改善雨水管理的最优策略。SAM计划涵盖水质、溪流生物群落（大型无脊椎动物、藻类）以及溪流生境的现状与趋势监测，用于评估环境状况的优劣变化，并识别普吉特低地（Puget Lowland）健康与受损溪流的分布模式。为达成上述研究目标，需构建基础地理空间数据框架，以刻画研究区域、采样点位及对应汇水区、河岸带的自然与人为活动特征。本数据集对应SAM小型溪流研究中105个采样点位的汇水区边界，是本研究构建的四项基础地理空间数据图层之一。此外，本分析纳入了2010至2015年间，由华盛顿州生态部（Washington State Department of Ecology）环境生物监测计划（Ambient Biological Monitoring program）在普吉特低地采集的16个参照点位的汇水区边界，以作为SAM研究的区域参照背景。本次数据发布共提供121个点位的汇水区边界数据。