Both water flow through and retention time (Ksat) in filter bed substrates in combination with plants remediate polluted storm w ater runoff in rain gardens. Two commonly used rain garden filter bed substrates were evaluated: sand (80% washed sand, 15% clay and silt fines and 5% pine bark v/v/v) and slate (100% expanded D-tank slate). Regression analyses showed that slate banded with increasing amounts of composted yard waste (CYW) resulted in a linear decrease in Ksat while, increasing amounts of pine bark (PB) banded resulted in a linear increase in Ksat. The amount of organic matter added to sand did not alter Ksat. Particle size distribution regression analyses showed that increasing the amount of CYW incorporated in sand caused coarse (>2.0 mm)size particles to increase linearly while, there was a quadratic effect on medium (0.5-2.0 mm) and fine (<0.5 mm) size particles. Amendment amount of CYW or PB with slate had no impact on particle size distributions in the coarse, medium, or fine particles.
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机译：过滤床衬底中的水流通过和保留时间（KSAT）与植物补救污染风暴Water在雨凉花园中。评估两种常用的雨园滤床底物：沙子（80％洗涤的沙子，15％粘土和淤泥粉和5％松树树皮V / V / v）和板岩（100％膨胀D罐板岩）。回归分析表明，随着堆肥量（CYW）的增加而带有增加量的ksat的线性减少，延时导致ksat的线性增加导致ksat的增加量。添加到砂中的有机物量没有改变ksat。粒度分布回归分析表明，在砂中掺入粗（> 2.0mm）尺寸颗粒的增加的Cyw量随时延长，介质（0.5-2.0mm）和细（<0.5mm）的尺寸（<0.5mm）均等效果。粒子。具有板岩的Cyw或Pb的修订量对粗糙，培养基或细颗粒中的粒度分布没有影响。
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