Underdrain definition

Underdrain means a drainage system installed beneath a stormwater holding area to improve the infiltration and percolation characteristics of the natural soil when permeability is restricted due to periodic high water table conditions or the presence of layers of fine textured soil below the bottom of the holding area. These systems usually consist of a system of interconnected below-ground conduits such as perforated pipe, which simultaneously limit the water table elevation and intercept, collect, and convey stormwater which has percolated through the soil.
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Underdrain means a perforated culvert in porous fill for drawing off subsurface water from the soil.
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Underdrain means a drainage system installed beneath a stormwater holding area to improve the infiltration and percolation characteristics of the natural soil when permeability is
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Examples of Underdrain in a sentence

  • Underdrain backfill or material such as sand and crushed or uncrushed material used as bedding shall meet MDOT Specification 703.22, Underdrain Backfill Material, as defined in the following table.

  • Cover the joint with the top of the corner plate on the outside of the structure with a geotextile conforming to Geotextile Underdrain from the Department's Materials Bureau Approved List.

  • Provide material meeting the requirements of §733-20 Underdrain Filter, Type 1.

  • Provide material meeting the requirements of §733-20 Underdrain Filter, Type 2.

  • The procedure for acceptance or rejection of Underdrain Filter materials shall be in conformance with the procedures contained in the geotechnical control procedure “Procedure for the Control and Quality Assurance of Granular Materials”.

  • The requirements for Underdrain Filter materials are described below.

  • A physical barrier may be used to facilitate placement of the Underdrain Filter and adjacent backfill.

  • The price per linear foot bid for this work shall include the cost of furnishing all labor, materials and equipment necessary to complete the work, except the excavation will be paid for under Trench and Culvert Excavation, and the Underdrain and Underdrain Filter will be paid for under their respective items.

  • Underdrain and Underdrain Filter shall be installed when shown on the plans or directed by the Engineer.The underdrain pipe shall be installed in accordance with §605-3.01, and the underdrain filter shall be placed in accordance with §605-3.02 except when the details of either or both are modified on the plans or by the Engineer's written order.

  • After the pipe installation has been inspected and approved, Underdrain Filter shall be loosely placed around and over the pipe to such a depth that, after compaction, Underdrain Filter shall extend to a level 6 in.


More Definitions of Underdrain

Underdrain means a clay tile pipe that protects the Branch 1 Aqueduct from sulphate attack by directing groundwater away from the Branch 1 Aqueduct;
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Underdrain means the original clay tile pipe foundation drain that runs parallel to the Aqueduct, and functions to channel groundwater and potable water leakage away from the Aqueduct.
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Underdrain means an appurtenance at the bottom of the filter to assure equal distribution of water through the filter media.
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Underdrain means a system of pipes, gravel, sand, and filter cloth used to recover
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Underdrain means the original clay pipe foundation drain that runs along the Branch 1 Aqueduct, and functions to channel groundwater and potable water leakage away from the vicinity of the aqueduct. In consideration of referenced City of Winnipeg Standard Construction Specifications, the term “underdrain” may be considered equivalent to the term “sewer”. D4. CONTRACT ADMINISTRATORD4.1 The Contract Administrator is UMA Engineering Ltd., represented by: Ron Bruce, P.Eng.Senior Project Engineer1479 Buffalo Place, Winnipeg, Manitoba, R3T 1L7Telephone No. (204) 928-7432Facsimile No. (204) 475-3646 D4.2 At the pre-construction meeting, Mr. Bruce will identify additional personnel representing the Contract Administrator and their respective roles and responsibilities for the Work. D5. CONTRACTOR'S SUPERVISOR D5.1 At the pre-construction meeting, the Contractor shall identify his designated supervisor and any additional personnel representing the Contractor and their respective roles and responsibilities for the Work. D5.2 At least two (2) business days prior to the commencement of any Work on the site, the Contractor shall provide the Contract Administrator with a phone number where the supervisor identified in D5.1 or an alternate can be contacted 24 hours a day to respond to an emergency. D6. NOTICES D6.1 Except as provided for in GC:23.2.2, all notices, requests, nominations, proposals, consents, approvals, statements, authorizations, documents or other communications to the Contractor shall be sent to the address or facsimile number identified by the Contractor in Paragraph 2 of Form A: Bid. D6.2 All notices, requests, nominations, proposals, consents, approvals, statements, authorizations, documents or other communications to the City, except as expressly otherwise required in D6.3, D6.4 or elsewhere in the Contract, shall be sent to the attention of the Contract Administrator at the address or facsimile number identified in D4.1.D6.3 All notices of appeal to the Chief Administrative Officer shall be sent to the attention of the Chief Financial Officer at the following address or facsimile number:The City of WinnipegChief Administrative Officer Secretariat Administration Building, 3rd Floor510 Main Street Winnipeg MB R3B 1B9Facsimile No.: (204) 949-1174 D6.4 All notices, requests, nominations, proposals, consents, approvals, statements, authorizations, documents or other communications required to be submitted or returned to the City Solicitor shall be sent to the foll...
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Related to Underdrain

  • drain means (subject to Section 219(2) of the 1991 Act) a drain used for the drainage of one building or any buildings or yards appurtenant to buildings within the same curtilage;

  • borehole means a hole sunk into the earth for the purpose of locating, abstracting or using subterranean water and includes a spring;

  • Drainage means the movement of water to a place of disposal, whether by way of the natural characteristics of the ground surface or by artificial means;

  • Topsoil means a varying depth (up to 300 mm) of the soil profile irrespective of the fertility, appearance, structure, agricultural potential, fertility and composition of the soil;

  • Pile means any non-containerized accumulation of solid, nonflowing hazardous waste that is used for treatment or storage and that is not a containment building.

  • Flue means a passage for conveying the products of combustion from a gas appliance to the external air.

  • dump means to abandon or discard any hazardous substance by depositing, discharging, spilling or releasing it;

  • Backpressure means a pressure (caused by a pump, elevated tank or piping, boiler, or other means) on the consumer's side of the service connection that is greater than the pressure provided by the public water system and which may cause backflow.

  • Junk means old or scrap copper, brass, rope, rags, batteries, paper, trash, rubber debris, waste, or junked, dismantled or wrecked automobiles, or parts of automobiles, iron, steel and other old or scrap ferrous or nonferrous material.

  • Water Main means (subject to Section 219(2) of the 1991 Act) any pipe, not being a pipe for the time being vested in a person other than the water undertaker, which is used or to be used by a water undertaker or licensed water supplier for the purpose of making a general supply of water available to customers or potential customers of the undertaker or supplier, as distinct from for the purpose of providing a supply to particular customers;

  • Uppermost aquifer means the geologic formation nearest the natural ground surface that is an aquifer, as well as lower aquifers that are hydraulically interconnected with this aquifer within the facility's property boundary.

  • Drainage area means a geographic area within which stormwater, sediments, or dissolved materials drain to a particular receiving waterbody or to a particular point along a receiving waterbody.

  • Underground injection means the subsurface emplacement of fluids through a bored, drilled or driven well; or through a dug well, where the depth of the dug well is greater than the largest surface dimension. (See also “injection well”.)

  • Infiltration means water other than wastewater that enters a sewer system (including sewer system and foundation drains) from the ground through such means as defective pipes, pipe joints, connections, or manholes. Infiltration does not include, and is distinguished from, inflow.

  • Exfiltration means any unauthorized release of data from within an information system. This includes copying the data through covert network channels or the copying of data to unauthorized media.

  • Highwall means a vertical or nearly vertical face in solid rock or a slope of consolidated or unconsolidated material that exceeds 3:1.

  • Incineration means an engineered process involving burning or combustion of solid waste to thermally degrade waste materials at high temperatures;

  • Stockpile means material, including, but not limited to, surface overburden, rock, or lean ore, that in the process of mining and beneficiation or treatment has been removed from the earth and stored on the surface. Stockpile does not include materials that are being treated in the production of metallic products and the metallic product that has been produced by that operation.

  • Dewatering means the removal of water for construction activity. It can be a discharge of appropriated surface or groundwater to dry and/or solidify a construction site. It may require Minnesota Department of Natural Resources permits to be appropriated and if contaminated may require other MPCA permits to be discharged.

  • Sailboat means the same as that term is defined in Section 73-18-2.

  • Injection means the pressurized placement of septage waste below the surface of soil.

  • Diameter means the diameter of the stem of a tree measured outside the bark at a specified point of measurement.

  • Sump means any pit or reservoir that meets the definition of tank and those troughs/trenches connected to it that serve to collect hazardous waste for transport to hazardous waste storage, treatment, or disposal facilities; except that as used in the landfill, surface impoundment, and waste pile rules, “sump” means any lined pit or reservoir that serves to collect liquids drained from a leachate collection and removal system or leak detection system for subsequent removal from the system.

  • mineralization means the concentration of metals and their chemical compounds within a body of rock;

  • Overflow means the intentional or unintentional diversion of flow from the collection and transport systems, including pumping facilities.

  • Surface waters means all waters of the state as defined in G.S. 143-212 except underground waters