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Title: Method and apparatus for determining the hydraulic conductivity of earthen material

An earthen material hydraulic conductivity determining apparatus includes, a) a semipermeable membrane having a fore earthen material bearing surface and an opposing rear liquid receiving surface; b) a pump in fluid communication with the semipermeable membrane rear surface, the pump being capable of delivering liquid to the membrane rear surface at a plurality of selected variable flow rates or at a plurality of selected variable pressures; c) a liquid reservoir in fluid communication with the pump, the liquid reservoir retaining a liquid for pumping to the membrane rear surface; and d) a pressure sensor in fluid communication with the membrane rear surface to measure pressure of liquid delivered to the membrane by the pump. Preferably, the pump comprises a pair of longitudinally opposed and aligned syringes which are operable to simultaneously fill one syringe while emptying the other. Methods of determining the hydraulic conductivity of earthen material are also disclosed.
 [1];  [1];  [1]
  1. (Idaho Falls, ID)
Issue Date:
OSTI Identifier:
Lockhead Idaho Technologies Company (Idaho Falls, ID) INEEL
Patent Number(s):
US 5520248
Contract Number:
AC07-94ID13223; AC07-76ID01570
Research Org:
Idaho National Engineering and Environmental Laboratory (INEEL), Idaho Falls, ID (United States)
Sponsoring Org:
Country of Publication:
United States
method; apparatus; determining; hydraulic; conductivity; earthen; material; semipermeable; membrane; bearing; surface; opposing; rear; liquid; receiving; pump; fluid; communication; capable; delivering; plurality; selected; variable; flow; rates; pressures; reservoir; retaining; pumping; pressure; sensor; measure; delivered; preferably; comprises; pair; longitudinally; opposed; aligned; syringes; operable; simultaneously; fill; syringe; emptying; methods; disclosed; variable flow; receiving surface; semipermeable membrane; hydraulic conductivity; permeable membrane; rear surface; flow rates; flow rate; fluid communication; earthen material; pressure sensor; bearing surface; pump comprises; variable pressure; material bearing; /166/73/