Watershed Volumetrics

This feature class aggregates data to the major Watershed scale. It provides the "Big Picture" view of regional flood resilience, comparing the total Baseline Storage Goal and Climate Resilience Goal against the entire inventory of MWRD and municipal assets. Key Field Dictionary: pln_watershed: Major Watershed Name (e.g., Cal-Sag Channel, North Branch). bsg_capgap_comb: Baseline Storage Capacity Gap. The total deficit in storage (ac-ft) for the current 100-year storm. unit_bsg_capgap_comb: Unmanaged Water Depth. The Capacity Gap normalized by watershed area (inches). CRG_capgap_comb: 2050 Climate Gap. The total volume of new storage required to meet the projected 2050 rainfall standards across the entire river basin.pct_imperv: Average Imperviousness. The area-weighted average impervious cover for the entire watershed, excluding open water.本要素类（feature class）将数据聚合至大型流域尺度，可呈现区域洪水韧性的"大图景"，对比MWRD及市政资产的全部存量，对总基线蓄水目标与气候韧性目标开展量化比对。 关键字段说明如下： pln_watershed：大型流域名称（例如Cal-Sag航道、北支流） bsg_capgap_comb：基线蓄水容量缺口。指当前100年一遇风暴情景下的总蓄水短缺量（单位：英亩-英尺，ac-ft） unit_bsg_capgap_comb：未管控水深。即按流域面积归一化后的容量缺口（单位：英寸，inches） CRG_capgap_comb：2050年气候缺口。指为满足全流域2050年预估降雨标准所需新增的总蓄水量 pct_imperv：平均不透水率。指全流域扣除开阔水域后，按面积加权计算的平均不透水覆盖占比