A soakaway (or infiltration trench) is a subsurface structure designed to disperse stormwater or treated effluent into the surrounding soil, thereby reducing surface runoff and recharging groundwater. When a soakaway becomes blocked, its infiltration capacity drops drastically, leading to surface flooding, structural damage, and environmental hazards. This paper examines the primary causes of soakaway blockage—namely sedimentation, biological clogging, and inappropriate waste disposal—and outlines diagnostic techniques and remedial strategies.
In soakaways receiving septic tank effluent, anaerobic bacteria produce a slimy organic layer (biomat) at the soil interface. While a thin biomat aids treatment, excessive thickness completely seals the soil pores. This is often irreversible without replacing the drainage field.
Pouring fats, oils, grease (FOG), or non-biodegradable items (wet wipes, sanitary products) into drains leading to a soakaway will cause rapid blockage. Unlike sewer systems, soakaways cannot be jet-washed easily to remove such materials. soakaway blocked
Tree and shrub roots seek moisture and nutrients, penetrating cracks in the soakaway chamber or perforated pipes. Roots expand over time, physically obstructing flow. Additionally, heavy vehicles passing over the soakaway area can compact the soil, collapsing the infiltration structure.
[Generated for user] Date: [Current Date] A soakaway (or infiltration trench) is a subsurface
The most frequent cause. Roof runoff carries fine particles (dust, moss, asphalt granules) into gutters and downpipes. Without a silt trap or filter, these sediments settle in the soakaway’s gravel voids or geotextile membrane, forming an impermeable layer.
| Consequence | Description | |-------------|-------------| | Surface Flooding | Water emerges at the lowest point (e.g., next to house foundations). | | Boggy Garden | Persistent wet areas, moss growth, and unpleasant odors. | | Structural Damage | Hydrostatic pressure against basement walls or foundation heave. | | Environmental Pollution | Untreated effluent surfacing can contaminate nearby wells or streams. | | Legal Liability | In many jurisdictions, a non-functioning soakaway for sewage is a statutory nuisance. | Pouring fats, oils, grease (FOG), or non-biodegradable items
Causes, Consequences, and Remediation of Blocked Soakaways in Domestic Drainage Systems