{"id":171,"date":"2023-12-07T18:37:58","date_gmt":"2023-12-07T23:37:58","guid":{"rendered":"https:\/\/opentextbc.ca\/plumbing4d\/?post_type=back-matter&p=171"},"modified":"2025-05-05T17:19:34","modified_gmt":"2025-05-05T21:19:34","slug":"glossary","status":"publish","type":"back-matter","link":"https:\/\/opentextbc.ca\/plumbing4d\/back-matter\/glossary\/","title":{"raw":"Glossary","rendered":"Glossary"},"content":{"raw":"","rendered":"
\n
area of infiltrative surface (AIS)<\/dfn><\/dt>\n
\n

Infiltrative surface area, in m\u00b2, receiving effluent from the distribution system. This is considered to be the bottom area of a trench in a trench-type gravity system.<\/p>\n<\/dd>\n

ASTTBC<\/dfn><\/dt>\n
\n

Applied Science Technologists and Technicians of British Columbia<\/p>\n<\/dd>\n

authorized person (AP)<\/dfn><\/dt>\n
\n

A registered onsite wastewater practitioner or professional.<\/p>\n<\/dd>\n

basal area<\/dfn><\/dt>\n
\n

For sand mounds, sand-lined trenches, bottomless sand filters, Alberta At Grade systems and CTDS, this is the native soil that the sand will be placed on.<\/p>\n<\/dd>\n

blinding layer<\/dfn><\/dt>\n
\n

A layer of clean coarse sand or mound sand that is installed between the infiltration surface (bottom of aggregate, base of chamber, etc.) and the native soil, and which is up to 10 cm (4 inches) thick.<\/p>\n<\/dd>\n

BOD<\/dfn><\/dt>\n
\n

5-day biochemical oxygen demand<\/p>\n<\/dd>\n

consistence<\/dfn><\/dt>\n
\n

Attribute of soil expressed in degree of cohesion and adhesion, or in resistance to deformation or rupture.<\/p>\n<\/dd>\n

DDS<\/dfn><\/dt>\n
\n

daily design flow<\/p>\n<\/dd>\n

dispersal area<\/dfn><\/dt>\n
\n

An area used to receive effluent discharged from a wastewater treatment method.<\/p>\n<\/dd>\n

gravel<\/dfn><\/dt>\n
\n

Rounded or subrounded rock fragment that is between 0.1 inches (2 millimetres) and 3 inches (76 millimetres) in diameter. Often called \u201cdrain rock.\u201d<\/p>\n<\/dd>\n

HAR<\/dfn><\/dt>\n
\n

hydraulic application rate<\/p>\n<\/dd>\n

HLR<\/dfn><\/dt>\n
\n

hydraulic loading rate<\/p>\n<\/dd>\n

holding tank<\/dfn><\/dt>\n
\n

A large cement or plastic tank into which household wastewater flows and is stored until it is pumped out.<\/p>\n<\/dd>\n

HS<\/dfn><\/dt>\n
\n

horizontal separation<\/p>\n<\/dd>\n

hydraulic loading rate (HLR)<\/dfn><\/dt>\n
\n

A measure of the volume of effluent, in litres, applied each day, per unit area (m\u00b2) of infiltrative surface.<\/p>\n<\/dd>\n

infiltrative surface<\/dfn><\/dt>\n
\n

In drainfields, the drain rock-to-original soil interface at the bottom of the trench; in mound systems, the gravel-to-mound sand and the sand-to-original soil interfaces; in sand-lined trenches\/beds (sand filter), the gravel-to-sand interface and the sand-to-original soil interface at the bottom of the trench or bed.<\/p>\n<\/dd>\n

Kfs<\/sub><\/dfn><\/dt>\n
\n

A measurement of the saturated hydraulic conductivity of soil. In theoretical terms, hydraulic conductivity is a measure of how easily water can pass through soil or rock. High values indicate permeable material through which water can pass easily, such as sand or gravel; low values indicate that the material, such as clay, is less permeable.<\/p>\n<\/dd>\n

limiting layer<\/dfn><\/dt>\n
\n

The shallowest of a restrictive layer, water table, seasonal high-water table or extremely permeable material (e.g., fractured rock, gravel).<\/p>\n<\/dd>\n

LLR<\/dfn><\/dt>\n
\n

linear loading rate<\/p>\n<\/dd>\n

perc<\/dfn><\/dt>\n
\n

percolation rate<\/p>\n<\/dd>\n

perc rate<\/dfn><\/dt>\n
\n

percolation rate<\/p>\n<\/dd>\n

platy structure<\/dfn><\/dt>\n
\n

Laminated or flaky soil aggregate developed predominantly along the horizontal axis.<\/p>\n<\/dd>\n

POA<\/dfn><\/dt>\n
\n

point of application<\/p>\n<\/dd>\n

privy<\/dfn><\/dt>\n
\n

A small building having a bench with a hole or holes through which human excretion may be evacuated into a waterproof vault or an excavated pit. Also known as an outhouse.<\/p>\n<\/dd>\n

registered onsite wastewater practitioner (ROWP)<\/dfn><\/dt>\n
\n

A person who is qualified to act as a registered onsite wastewater practitioner under section 7 (1) or (2) of the Sewerage System Regulation.<\/p>\n<\/dd>\n

restrictive layer<\/dfn><\/dt>\n
\n

A layer of soil or rock that impedes the vertical movement of water, air, and the growth of plant roots. This may include hardpan, some compacted soils, bedrock, glacial till and unstructured clay soils.<\/p>\n<\/dd>\n

sewage treatment system<\/dfn><\/dt>\n
\n

A system of pipes, pumps, tanks, and other equipment used for the collection, transport, and disposal of residential wastewater (sewage). Also known as a sewage disposal system, septic system, or sewerage system.<\/p>\n<\/dd>\n

SHWT<\/dfn><\/dt>\n
\n

seasonal high water table<\/p>\n<\/dd>\n

soil horizon<\/dfn><\/dt>\n
\n

Layers of soil or soil material approximately parallel to the land surface and different from adjacent layers in physical, chemical, and biological properties or characteristics such as colour, structure, texture, consistence, and pH.<\/p>\n<\/dd>\n

soil structure<\/dfn><\/dt>\n
\n

The combination or arrangement of individual soil particles into definable aggregates, or peds, which are characterized and classified based on size, shape, and degree of grade (distinctness).<\/p>\n<\/dd>\n

soil texture<\/dfn><\/dt>\n
\n

The relative proportions of the various soil separates (e.g., silt, clay, sand) in a soil.<\/p>\n<\/dd>\n

SPM<\/dfn><\/dt>\n
\n

Sewerage System Standard Practice Manual, Version 3. Access a PDF version of the SPM<\/a> online.<\/p>\n<\/dd>\n

SSR<\/dfn><\/dt>\n
\n

Sewerage System Regulation<\/a> within the Public Health Act<\/em><\/p>\n<\/dd>\n

TSS<\/dfn><\/dt>\n
\n

total suspended solids<\/p>\n<\/dd>\n

vertical separation<\/dfn><\/dt>\n
\n

The depth of unsaturated, original, undisturbed permeable soil below the infiltrative surface and above any limiting layer. This is the vertical depth of soil that the dispersal system is expected to be discharged into.<\/p>\n<\/dd>\n

VS<\/dfn><\/dt>\n
\n

vertical separation<\/p>\n<\/dd>\n<\/dl>\n","protected":false},"author":124,"menu_order":3,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"back-matter-type":[38],"contributor":[],"license":[],"class_list":["post-171","back-matter","type-back-matter","status-publish","hentry","back-matter-type-glossary"],"_links":{"self":[{"href":"https:\/\/opentextbc.ca\/plumbing4d\/wp-json\/pressbooks\/v2\/back-matter\/171","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/opentextbc.ca\/plumbing4d\/wp-json\/pressbooks\/v2\/back-matter"}],"about":[{"href":"https:\/\/opentextbc.ca\/plumbing4d\/wp-json\/wp\/v2\/types\/back-matter"}],"author":[{"embeddable":true,"href":"https:\/\/opentextbc.ca\/plumbing4d\/wp-json\/wp\/v2\/users\/124"}],"version-history":[{"count":2,"href":"https:\/\/opentextbc.ca\/plumbing4d\/wp-json\/pressbooks\/v2\/back-matter\/171\/revisions"}],"predecessor-version":[{"id":173,"href":"https:\/\/opentextbc.ca\/plumbing4d\/wp-json\/pressbooks\/v2\/back-matter\/171\/revisions\/173"}],"metadata":[{"href":"https:\/\/opentextbc.ca\/plumbing4d\/wp-json\/pressbooks\/v2\/back-matter\/171\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/opentextbc.ca\/plumbing4d\/wp-json\/wp\/v2\/media?parent=171"}],"wp:term":[{"taxonomy":"back-matter-type","embeddable":true,"href":"https:\/\/opentextbc.ca\/plumbing4d\/wp-json\/pressbooks\/v2\/back-matter-type?post=171"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/opentextbc.ca\/plumbing4d\/wp-json\/wp\/v2\/contributor?post=171"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/opentextbc.ca\/plumbing4d\/wp-json\/wp\/v2\/license?post=171"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}