Improving the infiltration capacity of urban soil is critical for effective stormwater management, but existing guidance on soil amendment in residential areas typically calls for tilling and amending soil throughout the entire yard, an approach that is most feasible during development or redevelopment. To develop guidance on less‐extensive soil amendment interventions which a homeowner could implement postconstruction, we designed a modeling study to compare four scenarios targeting soil amendment in a single‐family yard (1) at disconnected impervious features, (2) at locations with large upslope drainage areas, (3) at locations with a high topographic wetness index (TWI), and (4) randomly (control). We find that soil amendment may be ineffective at reducing runoff from residential areas with high near‐surface infiltration rates (e.g., K_sat > 1 × 10⁻² m/hr), but can reduce runoff by 46%–73% (up to 15% of precipitation) on yards with lower near‐surface infiltration rates. We find that targeting amendment at interfacial hotspots near disconnected impervious surfaces can reduce runoff by over 10× more than amending a random equivalent area and by at least 2× more than targeting amendment by drainage area or TWI. We suggest including this intervention in the suite of low impact development practices promoted to residential property owners since it effectively and efficiently reduces runoff and may appeal to homeowners who are wary of maintenance needs of other practices.

中文翻译：

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在居民区进行土壤改良最有效的低影响开发实践

改善城市土壤的渗透能力对于有效的雨水管理至关重要，但是现有的居民区土壤改良指南通常要求在整个院子内耕种和改良土壤，这是在开发或重建过程中最可行的方法。为了针对房主可以在施工后实施的较少范围的土壤改良干预措施制定指南，我们设计了一个模型研究，以比较针对单个家庭院子中四种针对土壤改良剂的方案（1）防渗功能断开，（2）面积较大的地点上坡排水区，（3）高地形湿度指数（TWI），以及（4）随机（对照）。我们发现，土壤改良剂可能无法有效减少近地表入渗率高的居民区的径流（例如，K _sat  > 1×10 ^-2  m / hr），但在近地表入渗率较低的院子中，径流可以减少46％–73％（最多减少15％）。我们发现，在不连通的不透水表面附近的界面热点处进行目标修正，比通过修正一个随机等效区域可以减少10倍以上的径流，并且比通过排水面积或TWI进行目标修正可以减少至少2倍。我们建议将此干预措施包括在推广给住宅物业所有者的低影响开发实践套件中，因为它可以有效地减少径流，并且可能吸引那些对其他实践的维护需求持谨慎态度的房主。