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 Mobile ViewPLUMBING SYSTEM INSPECT DIAGNOSE REPAIR SEPTIC SYSTEM INSPECT DIAGNOSE REPAIR Septic Guide for Home Buyers or Owners Septic or Sewer Connection? Septic System Design Septic System Designs Master List Septic Inspection Testing Septic Maintenance Repair Septic Component & Product Suppliers Septic Videos ADDITIVES / TREATMENTS for SEPTIC SYSTEMS AEROBIC SEPTIC SYSTEMS ALTERNATING BED SEPTIC SYSTEMS BACKUP PREVENTION, SEWER LINE BIOLOGICAL POLLUTANTS BIOLOGICAL POLLUTANTS in the HOME - EPA BOOKS, RECOMMENDED SEPTIC BOOKSTORE, SEPTIC SYSTEMS CESSPOOLS CESSPOOL SAFETY WARNINGS CHECK VALVES CHEMICALS & TREATMENTS for SEPTICS CHLORINE IN DRINKING WATER CISTERNS CLOGGED DRAIN DIAGNOSIS & REPAIR D BOX TROUBLESHOOTING DEFINITIONS OF SEPTIC SYSTEM TERMS DIFFICULT SEPTIC SITES DISTRIBUTION-BOX INSPECTION, SEPTIC DRAINFIELD FAILURE DIAGNOSIS DRIVING or PARKING OVER SEPTIC COMPONENTS? DRYWELL DESIGN & USES FILTERS SEPTIC & GREYWATER FLOOD DAMAGE ASSESSMENT, SAFETY & CLEANUP FLOODED SEPTIC SYSTEMS, REPAIR GARBAGE DISPOSAL vs SEPTICS GRAVELLESS SEPTIC SYSTEMS GRAVITY/SIPHON DOSING SYSTEMS GREYWATER SYSTEMS HOME BUYERS GUIDE to SEPTIC SYSTEMS HOME SELLERS GUIDE TO SEPTIC INSPECT LAGOON SEPTIC SYSTEMS LEACHFIELD FAILURE DIAGNOSIS MEDIA FILTER SEPTIC SYSTEMS MOUND SEPTIC SYSTEMS NOISE / SOUND DIAGNOSIS & CURE ODORS & SMELLS DIAGNOSIS & CURE ODOR DIAGNOSIS CHECKLIST ODORLESS CHEMICALS / GASES: CHECK FOR? ODORS, PLUMBING SYSTEM ODORS, SEPTIC or SEWER ODORS, SULPHUR SMELL SOURCES OUTHOUSES & LATRINES PLANTS & TREES OVER SEPTIC SYSTEMS PRESSURE DOSING SEPTIC SYSTEMS RAISED BED SEPTIC SYSTEMS SAND BED SEPTIC SYSTEMS SEEPAGE PITS SEPTIC & CESSPOOL SAFETY SEPTIC AUTHORITIES SEPTIC BACKUP PREVENTION SEPTIC BACKUP REPAIR SEPTIC BOOK, ONLINE SEPTIC BOOKSTORE SEPTIC BIOMATS SEPTIC CARE INSTRUCTIONS SEPTIC CLEARANCE DISTANCES SEPTIC CODES & REFERENCES SEPTIC CONSULTANTS SEPTIC D-BOX INSPECTION SEPTIC DRAINFIELD FAILURE DIAGNOSIS SEPTIC DRAINFIELD INSPECTION & TEST SEPTIC DRAINFIELD LIFE SEPTIC DRAINFIELD LOCATION SEPTIC DRAINFIELD RESTORERS? SEPTIC DRAWINGS SEPTIC DYE TEST PROCEDURE SEPTIC FAILURE LAWSUIT SEPTIC FAILURE SIGNS SEPTIC FIELD INSPECTION SEPTIC FILTERS SEPTIC FLOOD RESPONSE SEPTIC INSPECTION BOOK SEPTIC INSPECTION & TEST GUIDE SEPTIC LIFE EXPECTANCY SEPTIC LIFE MAXIMIZING STEPS SEPTIC METHANE GAS SEPTIC ODORS SEPTIC PUMPS SEPTIC PUMPING REPAIR SEPTIC REFERENCES SEPTIC & CESSPOOL SAFETY SEPTIC SUPPLIES & PARTS SEPTIC SYSTEM DEFINITIONS SEPTIC SYSTEM DESIGN ALTERNATIVES Master List of Septic System Types ALTERNATIVE SEPTIC DESIGNERS ALTERNATIVE SEPTIC PRODUCTS AEROBIC SEPTIC SYSTEMS ALTERNATING BED SEPTIC SYSTEMS BIOGAS PRODUCTION & USE CESSPOOLS DISINFECTION SYSTEMS, SEPTIC EFFLUENT DRYWELL DESIGN & USES EVAPORATION-TRANSPIRATION SEPTIC SYSTEMS FILTERS SEPTIC & GREYWATER FIXED-FILM PROCESS SEPTIC SYSTEMS GRAVELLESS SEPTIC SYSTEMS GRAVITY/SIPHON DOSING SYSTEMS GREYWATER SYSTEMS HOLDING TANK SEPTIC SYSTEMS LAGOON SEPTIC SYSTEMS MEDIA FILTER SEPTIC SYSTEMS MOUND SEPTIC SYSTEMS RAISED BED SYSTEMS SAND BED SEPTIC SYSTEMS SEEPAGE PITS SEPTIC SYSTEM PUMPS SEQUENCING BATCH SEPTIC SYSTEMS SEWAGE TREATMENT SYSTEMS STEEP SLOPE SEPTIC DESIGNS TOILET ALTERNATIVES TOILET TYPES Toilet Types, Flush Methods TOILETS, DON'T FLUSH LIST TRAPS on PLUMBING FIXTURES VEGETATED SUBMERGED SEPTIC BEDS Wastewater Treatment Levels Wastewater Dispersal Methods WETLAND SEPTIC SYSTEMS SEPTIC SYSTEM DESIGN BASICS DRYWELL DESIGN & USES FILTERS SEPTIC & GREYWATER SEEPAGE PITS SEPTIC CLEARANCES SEPTIC SOIL & PERC TESTS SEPTIC TANK SIZE SEPTIC TANK DEPTH SEPTIC TANK TEES SEPTIC DRAINFIELD SIZE SEPTIC DRAINFIELD SHAPE SEPTIC TANK PUMPING FREQUENCY SEPTIC TANK PUMPING PROCEDURE SEPTIC SYSTEM PUMPS SEPTIC TREATMENTS STEEP SLOPE SEPTIC DESIGNS SEPTIC SYSTEM DESIGN MANUAL - Online SEPTIC SYSTEMS, HOME BUYERS GUIDE to SEPTIC SYSTEM INSPECTION & TEST GUIDE SEPTIC SYSTEMS INSPECTION COURSE SEPTIC INSPECTION TYPES & LEVELS SEPTIC SYSTEM ODORS SEPTIC SYSTEMS ONLINE BOOK SEPTIC SYSTEM PUMPS SEPTIC SYSTEM SAFETY WARNINGS SEPTIC SYSTEM TYPES, MASTER LIST SEPTIC TANKS SEPTIC TANK BAFFLES SEPTIC TANK COVERS SEPTIC TANK, HOW TO FIND SEPTIC TANK INSPECTION PROCEDURE SEPTIC TANK LEAKS SEPTIC TANK LEVELS of SEWAGE SEPTIC TANK PUMPING SCHEDULE SEPTIC TANK PUMPING PROCEDURE SEPTIC TANK SAFETY SEPTIC TANK SIZE SEPTIC TANK TEES SEPTIC TESTS: DYE & LOADING TESTS SEPTIC TREATMENTS & CHEMICALS SEWAGE BACKUP TEST & CLEANUP SEWAGE & SEPTIC CONTAMINANTS SEWAGE CONTAMINATION in buildings SEWAGE CONTAMINANTS in FRUIT / VEGETABLES SEWAGE EJECTOR / GRINDER PUMPS SEWAGE LEVELS in SEPTIC TANKS SEWAGE NITROGEN CONTAMINANTS SEWAGE PATHOGENS in SEPTIC SLUDGE SEWAGE PUMPS SEWER BACKUP PREVENTION SEWER GAS ODORS SEWER LINE REPLACEMENT SINKHOLES, WARNING SIGNS SMELL PATCH TEST to Track Down Odors SOAKAWAY BED FAILURE DIAGNOSIS SULPHUR & SEWER GAS SMELL SOURCES SUMP PUMPS TOILETS, INSPECT, INSTALL, REPAIR TOILET ALTERNATIVES TOILET FLUSHOMETER VALVES TOILET INSTALLATION PROCEDURE TOILET OVERFLOW EMERGENCY TOILET PLUGS, SEWER BACKUP TOILET REPAIR GUIDE TOILET TISSUE CHOICES TOILET TYPES Toilet Types, Flush Methods TOILETS, DON'T FLUSH LIST TRAPS on PLUMBING FIXTURES TREATMENTS & CHEMICALS, SEPTIC VIDEO GUIDES: Septic Videos WASHING MACHINES WASTEWATER TREATMENT BASICS WATER, WELLS, WATER TANKS: TESTING GUIDE WATER PURIFIERS WATER QUALITY TESTS, CONTAMINANTS, TREATMENT WATER QUANTITY IMPROVEMENT WATER QUANTITY USAGE GUIDE WATER SOFTENERS & CONDITIONERS WATER SUPPLY & DRAIN PIPING WATER TESTS, CONTAMINANTS, TREATMENT WATER TREATMENT EQUIPMENT CHOICES WELLS CISTERNS & SPRINGS WELL CLEARANCES WETLAND SEPTIC SYSTEMS WINTERIZE A BUILDING More Information |
This article explains the design and function of raised bed septic systems. In the sketch shown here the raised bed septic system is similar in design to a mound system but some use is made of original local soils for the raised bed. (Source: US EPA) Effluent is discharged to the effluent treatment and absorption system by a pumping chamber. Alternatively the raised bed component of a septic system, if suitably located, may be supplied effluent by gravity feed. Citation of this article by reference to this website and brief quotation for the sole purpose of review are permitted. Use of this information at other websites, in books or pamphlets for sale is reserved to the author. Technical review by industry experts has been performed and is ongoing - reviewers welcomed and are listed at References. © Copyright 2012 InspectAPedia.com, All Rights Reserved. Information Accuracy & Bias Pledge is at below-left. Use page top links to major topics or use links at the left of each page to navigate within topics and documents at this website. Green links show where you are in a document series or at this website. Raised Septic Systems DesignsRAISED BED SEPTIC SYSTEMS: a wastewater absorption trench system which has been constructed in soil-fill material which has been placed on top of the natural soil on a building lot. Raised systems are often confused with "septic mound systems" but have different design requirements, and make at least partial use of existing soils for wastewater treatment. Raised bed septic systems are constructed in fill over soil which can accept septic effluent below the fill. MOUND SEPTIC SYSTEMS are constructed in fill over soil which does not acceptably treat septic effluent below the fill - all of treatment occurs in the mound. Other requirements differ as well. The following description of raised bed septic system design, installation, and maintenance is from: New York Appendix 75-A.9 Alternative Septic System Designs section 9.b Raised Bed Septic Systems Section 75-A.9 Alternative Septic Systems: (b) Raised Septic Systems Design CriteriaTitle: Appendix 75-A.9 - Alternative Septic Systems
[Regulation and System Design Criteria for Raised Septic Systems,
Septic Mound Systems, Intermittent Sand Filter Bed Systems,
Evaporation-Transpiration Septic Systems,
Evaporation-Transpiration Absorption Septic Systems, and
Other Alternative Septic Systems]
(1) General: Raised Septic SystemsA raised septic system [or raised bed septic system] is an absorption trench system constructed in fill material with acceptable permeability placed above the natural soil on a building lot. [DF: Note: while they are similar in design "raised septic systems" discussed here are not identical to "mound septic systems" discussed at Septic Mounds which have different site requirements] (2) Site Requirements for Raised Septic SystemsA raised system may be used where all the following conditions are found: (i) There is at least one foot of original soil with a faster than 60 minutes percolation rate, above any impermeable soil layer or bedrock, but not more than two feet. (ii) The maximum high groundwater level must be at least one foot below the original ground surface. (iii) Slopes shall not exceed 15%. (iv) All minimum vertical and horizontal separation distances can be maintained as described in Table 2. (3) Design Criteria for Raised Bed Septic Systems(i) Percolation tests shall be conducted in the fill material at the borrow pit and after placement and settling at the construction site. The slower percolation rate of these tests shall be used for design purposes. (ii) The total area beneath the absorption trenches, extending 2.5 feet in all directions from the outer edge of all trenches, is defined as the basal area. The minimum size of the basal area of the raised bed shall be calculated based upon 0.2 gpd/sq.ft. (iii) An absorption trench system as described in Section 75-A.8(b) is designed using the percolation rate of the fill material. The use of slowly permeable soils for the fill material will result in a trench system that will have a basal area larger than the minimum area calculated in (ii) above. (iv) Sufficient soil with a percolation rate of between 5 - 30 min/in is required to maintain at least two feet separation between the proposed bottom of the trenches and any boundary condition such as groundwater, bedrock, clay or other relatively impermeable soil or formation. (v) The edge of the fill material shall be tapered at a slope of no greater than one vertical to three horizontal with a minimum 20 foot taper. (vi) Horizontal separation distances shall be measured from the outside edge of the taper. (vii) The system shall incorporate siphon dosing or pressure distribution except where the following conditions are met: (aa) The local health department has a program incorporating site evaluation, system design approval, and construction inspection/certification. (bb) A minimum of two feet of fill material with a percolation rate of 5 - 30 min/in shall be placed between the bottom of the trenches and the existing ground. (viii) Curtain drains may be used to intercept and carry underground water away where high groundwater levels exist. Curtain drains shall be upslope from the system and at least 20 feet from the toe of slope of the fill material. (4) Construction details for raised bed septic systems(i) Heavy construction equipment shall not be allowed within the area of the system. The underlying soil shall be undisturbed although the surface may be plowed with at least a double bottomed blade/furrow plow and the furrow turned upslope. (ii) A system shall not be built in unstablized fill material. The fill material shall be allowed to settle naturally for a period of at least six months to include one freeze-thaw cycle. (iii) The absorption trenches shall be constructed in the fill material. (iv) The entire surface of the system including the tapers shall be covered with a minimum of six inches of topsoil, mounded to enhance the runoff of rainwater from the system and seeded to grass. (v) On sloping sites a diversion ditch or curtain drain shall be installed uphill to prevent surface water runoff from reaching the bed area. [See Curtain drains or intercept drains can protect septic drainfields in areas of wet soils or surface and subsurface groundwater] Questions & Answers regarding this article. Ask a Question or Search InspectAPediaHTML Comment Box is loading comments...
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