Antibacterial NANO face masks - last 500 pcs

 

 

PRICES include / exclude VAT
Homepage>BS Standards>91 CONSTRUCTION MATERIALS AND BUILDING>91.010 Construction industry>91.010.30 Technical aspects>20/30396852 DC BS ENISO 22282-4. Geotechnical investigation and testing. Geohydraulic testing Part 4. Pumping tests
Sponsored link
immediate downloadReleased: 2020-05-01

20/30396852 DC

BS ENISO 22282-4. Geotechnical investigation and testing. Geohydraulic testing Part 4. Pumping tests

CURRENCY
LANGUAGE
English
Standard number:20/30396852 DC
Pages:32
Released:2020-05-01
Status:Draft for Comment
DESCRIPTION
This standard 20/30396852 DC BS ENISO 22282-4. Geotechnical investigation and testing. Geohydraulic testing is classified in these ICS categories:
  • 91.010.30 Technical aspects
  • 93.020 Earthworks. Excavations. Foundation construction. Underground works

This part of ISO 22282 establishes requirements for pumping tests as part of geotechnical investigation service in accordance with EN 1997-1 and EN 1997-2.

General rules on the planning and execution of geohydraulic field tests are covered by ISO 22282-1.

A pumping test consists in principle of:

  • drawing down the piezometric surface of the groundwater by pumping from a well (the test well);

  • measuring the pumped discharge and the water level in the test well and piezometers, before, during and after pumping, as a function of time.

This part of ISO 22282 applies to pumping tests performed on aquifers whose permeability is such that pumping from a well can create a lowering of the piezometric head within hours or days depending on the ground conditions and the purpose. It covers pumping tests carried out in soils and rock.

The tests concerned by this part of ISO 22282 are those intended for evaluating the hydrodynamic parameters of an aquifer and well parameters, such as:

  • permeability of the aquifer,

  • radius of influence of pumping,

  • pumping rate of a well,

  • response of drawdown in an aquifer during pumping,

  • skin effect,

  • well storage,

  • response of recovery in an aquifer after pumping.


This product includes: