HRWP Significant Surface Water Contribution Areas

A SSWCA is defined in the Growth Plan for the Greater Golden Horseshoe (2020) as, “Areas, generally associated with headwater catchments, that contribute to baseflow volumes which are significant to the overall surface water flow volumes within a watershed.” Municipalities have sought further clarity from the province, herein the definition of SSWCAs is focused on contribution to baseflow volumes that are significant to surface water flow volumes, which is more specific than simply delineating headwaters. SSWCAs are those areas which are both SGRAs and ESGRAs; the methodologies used to delineate SGRAs and ESGRAs should be used to identify SSWCAs.”

《金马蹄地区（Greater Golden Horseshoe）2020年增长计划》中将地表水源贡献区（SSWCA）定义为：“通常与源头集水区相关联的区域，其贡献的基流体量对流域内整体地表水流总量具有显著意义。” 各地方市政当局已向该省寻求进一步明确相关定义，因此本文中SSWCA的界定聚焦于对地表水流总量具有显著贡献的基流体量，这一表述较单纯划定源头集水区更为具体精准。SSWCA需同时属于源地下水保护区（SGRA）与环境源地下水保护区（ESGRA），划定SGRAs与ESGRAs所采用的方法学，可直接用于识别SSWCAs。