摘要 : Abstract Alternative storm water management focuses on channeling rainwater to underground reservoirs, decreasing the surface flow, and reducing the load of wastewater treatment systems in urban planning. However, soil permeabilit... 展开 Abstract Alternative storm water management focuses on channeling rainwater to underground reservoirs, decreasing the surface flow, and reducing the load of wastewater treatment systems in urban planning. However, soil permeability is a major hindrance to alternative management techniques. Increasing soil permeability is necessary to manage rainwater harvesting and increase groundwater recharge. Additionally, earthworm density directly affects soil properties. In this study, we investigated the effects of earthworm density and species on the permeability of clay loam soil by a gravity-driven film flow. We conducted indoor and outdoor experiments by installing boxes/tanks with layers of materials (gravel, textile, clay loam soil, and organic matter). In the indoor experiments (IE), these materials were used to feed individuals of Lumbricus terrestris with an initial density of 25/m², 50/m², 100/m² while the outdoor experiments (OE) had the initial density of 108/m². All experiments were conducted in triplicate. The permeability velocity was measured using the gravity-driven film flow method with a flow rate of 1 cm/unit time. The coefficient of determination R² of 0.86, 0.93, 0.93 between infiltration velocity and time variable was determined using the data on the initial earthworm density in the IE in one year. Moreover, the growth percentage of L100 was the highest value at 1347% in 391st days. Meanwhile, in the OE, compared to the OE with two earthworms (Lumbricus terrestris and Aporrectodea caliginosa), the infiltration velocity of contained tanks by A. caliginosa were significantly greater than the ones by L. terrestris at 289% and 155%, respectively. The coefficient of determination R² of 0.89, 0.89, 0.98 between infiltration velocity and time variable was collected by the initial presence of two earthworm species for one year. The results of the experiment showed that burrowing earthworms can significantly facilitate the infiltration velocity of clay loam soil, and the density of earthworms was found to affect the capacity of permeability, based on the gravity-driven film flow methodology. This also illustrates that the two functional groups have different interactions with the infiltration velocity. Data provided in this study could be used to apply the functional earthworms in ameliorating the alternative techniques in stormwater management systems. 收起