LNWB Ch10 Stream Flow

Overview: Streamflow is part of the dynamic hydrologic system that supports a range of water dependent activities in Whatcom County, including farming, fishing and recreation. The relationship between streamflow, groundwater recharge and groundwater discharge, precipitation, fish habitat and crop production is critical for understanding how best to manage water to meet those needs. Streamflow is the best characterized, and most easily measured, component of the dynamic hydrologic system, and as such, is the primary metric used in modeling the water budget. For example, facilitating development of water management options that improve streamflow in the late summer is one of the reasons for developing the Lower Nooksack Water Budget. The Lower Nooksack Water Budget project included a review of available streamflow measurements made available since WRIA 1 Water Management Project Phase III Task 1 (2002). For the streamflow database update (Lower Nooksack Water Budget Project, Task 2), the project team compiled available information, data, and maps of the stream data collected in the Lower Nooksack study area, as well as WRIA 1 upstream boundary conditions, and updated the database of measured streamflow from 1999 to 2011. The updated streamflow database will be used to calibrate and validate the Topnet-WM hydrologic model, and to calculate water budgets for each of the Lower Nooksack drainages; data will be available in an ASCII format for all other drainages but will not be formally summarized. The following section begins with the list of streamflow gages in WRIA 1, followed by an explanation of how the data were used for model inputs. This information was used along with other Lower Nooksack Water Budget technical components to calculate the hydrologic model outputs working with the WRIA 1 Joint Board’s existing hydrologic model and supporting technical tools. This resource is a subset of the Lower Nooksack Water Budget (LNWB) Collection Resource.概述： 径流（streamflow）是支撑霍特科姆县（Whatcom County）各类涉水活动的动态水文系统的核心组成部分，涵盖农业、渔业与休闲娱乐等领域。径流、地下水补给（groundwater recharge）、地下水排泄（groundwater discharge）、降水（precipitation）、鱼类栖息地（fish habitat）与作物生产（crop production）之间的关联，对于优化水资源管理以满足上述各类需求至关重要。径流是动态水文系统中表征最为充分、最易测量的组成部分，因此亦是水量平衡（water budget）建模的核心度量指标。例如，制定可改善夏末径流状况的水资源管理方案，正是推动下努克萨克水量平衡（Lower Nooksack Water Budget）项目立项的核心动因之一。 下努克萨克水量平衡项目梳理了自WRIA 1水资源管理项目第三阶段任务1（WRIA 1 Water Management Project Phase III Task 1，2002年）以来公开可获取的径流监测数据。在本次径流数据库更新工作（下努克萨克水量平衡项目任务2，Lower Nooksack Water Budget Project, Task 2）中，项目团队整合了下努克萨克研究区域内采集的径流监测相关信息、数据与图集，同时纳入WRIA 1上游边界条件相关资料，并将实测径流数据库的时序更新至1999年至2011年。更新后的径流数据库将用于校准与验证Topnet-WM水文模型（Topnet-WM hydrologic model），并计算下努克萨克各子流域的水量平衡；其余流域的相关数据将以ASCII格式（ASCII format）提供，但不会进行正式汇总整理。 后续章节将首先列出WRIA 1流域内的径流监测站（streamflow gages）清单，随后阐释数据作为模型输入的具体应用方式。本研究结合WRIA 1联合委员会（WRIA 1 Joint Board）现有水文模型与配套技术工具，联合下努克萨克水量平衡项目的其他技术模块，完成了水文模型输出结果的计算。 本资源为下努克萨克水量平衡数据集合集（Lower Nooksack Water Budget, LNWB）的子集。