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SEPTIC SYSTEM INSPECT DIAGNOSE REPAIR
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SEPTIC SYSTEMS, HOME BUYERS GUIDE to
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SEWAGE CONTAMINATION in buildings
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SEWAGE EJECTOR / GRINDER PUMPS
SEWAGE LEVELS in SEPTIC TANKS
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SEWAGE PATHOGENS in SEPTIC SLUDGE
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TOILETS, INSPECT, INSTALL, REPAIR
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TRAPS on PLUMBING FIXTURES
TREATMENTS & CHEMICALS, SEPTIC
VIDEO GUIDES: Septic Videos
WASHING MACHINES & SEPTIC SYSTEMS
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WATER SUPPLY & DRAIN PIPING
WASTEWATER TREATMENT BASICS
WATER, WELLS, WATER TANKS: TESTING GUIDE
WINTERIZE A BUILDING
How to build a drywell or seepage pit: this document describes the actual building (on-site construction) of a drywell or seepage pit. The specifications for drywells & seepage pits, such as pit size, depth, absorption area, site space requirements & clearances, are described separately at DRYWELL / SEEPAGE PIT SPECIFICATIONS.
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The schematic of a seepage pit (left, courtesy USDA) shows typical construction of a site built seepage pit using brick, block, or pre-cast concrete rings with open joints, surrounded by stone to improve soil absorption.
(i) Laterals leading to each seepage pit must be at least four inches in diameter with a minimum slope of 1/8 inch per foot.
(ii) Seepage pits shall not be connected in series. A distribution box shall be required where more than one seepage pit is installed.
(iii) The pit excavation is to be raked to minimize sidewall smearing that may occur and reduce infiltration capacity. If groundwater is encountered, the pit shall be backfilled with the original soil to a level at least three feet higher than maximum groundwater and adjustments made in the pit dimensions.
(iv) The linings are placed upon a concrete block, poured concrete, or precast footing and surrounded by a six inch minimum annular ring of large aggregate (2 1/12 - 4 inches in size).
(v) The rock is covered to prevent soil from filling the void spaces. Building paper, a four inch thick layer of hay or straw may be used.
(vi) The seepage pit cover shall be structurally sound and capable of supporting 300 pounds per square foot at the weakest point. Covers may be precast concrete or cast-in-place and shall be reinforced. A manhole with an opening of at least 20 inches in the shortest dimension shall be provided.
Frequently Asked Questions (FAQs)
Questions & answers & design specifications: how to design and build a drywell or seepage pit for graywater or septic effluent disposal
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Technical Reviewers & References
Related Topics, found near the top of this page suggest articles closely related to this one.
Design Manuals for Septic Systems
Onsite Wastewater Disposal Books