{"product_id":"vertical-geosynthetic-water-permeability-tester","title":"Vertical Geosynthetic Water Permeability Tester","description":"\u003ch2\u003e\u003cspan\u003eVertical Geosynthetic Water Permeability Tester – QualiGTX™ GPT V\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch4\u003e\u003cspan\u003eVertical Permeability Testing of Geosynthetics for Water Conservancy Applications\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cspan\u003eThe QualiGTX™ GPT V Vertical Geosynthetic Water Permeability Tester measures the rate at which water flows through the thickness of a geosynthetic specimen secured over a fixed 20 cm² test area. Its color touchscreen allows users to configure test parameters, while the digital timer automatically records test duration without requiring continuous operator supervision. This automated operation is particularly useful for extended testing of fine filter fabrics. The instrument accommodates a wide range of geosynthetic materials used in seepage control and drainage applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe tester is particularly valuable in water resources engineering, where the permeability of filter fabrics directly affects the performance of hydraulic structures. Geotextiles installed in embankment dams, levees, canals, and reservoir linings must allow seepage water to pass through at a rate equal to or greater than the flow supplied by the surrounding soil. Vertical permeability measurements help determine whether these requirements are met. The QualiGTX™ GPT V delivers consistent test results, supporting reliable comparisons between different material production lots.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe specimen clamping assembly is manufactured from high-strength aluminum alloy to maintain dimensional stability during repeated clamping cycles and resist corrosion during prolonged water exposure. Designed as a floor-standing unit, the tester features overall dimensions of 720 × 700 mm, a column height of 1900 mm, and a total weight of 110 kg. Its integrated water circuit and specimen testing cell provide a self-contained testing arrangement while preserving laboratory bench space.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eVertical Geosynthetic Water Permeability Tester – QualiGTX™ GPT V Applications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe QualiGTX™ GPT V is designed for hydraulic engineering laboratories and geosynthetic manufacturers supplying materials for water resources infrastructure.\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eEmbankment Dam Construction\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Evaluates the permeability of filter and drainage fabrics used in dam cores, chimney drains, and toe drains, where effective seepage management is essential to structural safety.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eLevee and Flood Defense Works\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Verifies that filter geotextiles provide sufficient water flow to prevent pressure buildup behind revetments and protective armoring layers.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eCanal and Irrigation Lining\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Tests geotextiles installed beneath or behind canal linings to assess their ability to release trapped seepage water that could otherwise lift or displace the lining system.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eReservoir and Pond Systems\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Determines the flow capacity of filter layers used in underdrainage systems and leak detection installations.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHydropower Civil Works\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Supports permeability assessment of filter and transition zones incorporated into water-retaining structures.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eGeotextile Manufacturing for Hydraulic Projects\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Provides production lot documentation of water flow capacity against declared values specified in water resources project tenders.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFilter Criteria Verification\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Establishes the fabric permeability value that engineers compare with soil permeability when evaluating filter compatibility.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eThird-Party and Owner Laboratories\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Supports acceptance testing of delivered geosynthetic materials before their installation in permanent hydraulic structures.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan\u003eVertical Geosynthetic Water Permeability Tester – QualiGTX™ GPT V Key Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe QualiGTX™ GPT V focuses on two critical factors in reliable vertical permeability testing: effective specimen sealing and accurate measurement of test duration.\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eMachined Aluminum Alloy Specimen Clamp\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Provides a secure seal around the specimen perimeter, directing water through the fabric rather than allowing flow around its edges. The corrosion-resistant aluminum alloy is suitable for extended exposure to standing water.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFixed 20 cm² Test Area\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Establishes a precisely defined testing area for permeability calculations, eliminating uncertainty associated with using a nominal opening diameter and its associated tolerance range.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAutomatic Digital Timing\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Automatically monitors test duration during extended, low-flow measurements of fine filter fabrics, eliminating the need for impractical and potentially inaccurate manual timing.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eColor Touchscreen Control\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Stores test parameters directly on the instrument, allowing consistent testing conditions to be selected and repeated across different operators and material batches.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eCross-Plane Test Geometry\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Measures water flow through the material thickness, the direction relevant to filtration and seepage relief performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBroad Material Coverage\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Supports permeability testing across various geosynthetic materials used for seepage control, drainage, and separation applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFloor-Standing Column Frame\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Accommodates the specimen cell and water circuit within a 720 × 700 mm footprint, leaving laboratory workbench space available for specimen preparation.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan\u003eTheory and Method\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eFilter design for hydraulic structures depends on comparing the water permeability of the filter fabric with the permeability of the surrounding soil. Water seeping through an embankment or beneath a canal lining must pass through the filter geotextile at a rate equal to or greater than the rate at which the soil supplies it. If the fabric restricts water flow, pressure can accumulate along its upstream surface. This buildup may lift canal linings, weaken embankment cores, and eventually cause soil movement. To prevent these conditions, engineers evaluate fabric permeability against the permeability of the retained soil, applying an appropriate safety margin. Consequently, the measured permeability coefficient serves as an important input for hydraulic filter design and safety assessments.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA fixed test area of 20 cm² helps maintain accuracy and consistency in permeability calculations. The permeability coefficient is determined using flow volume, elapsed time, hydraulic gradient, and the cross-sectional area through which water passes. Since the test area directly influences the calculation, any uncertainty in its dimensions carries through to the reported coefficient. The precisely machined specimen clamp establishes a consistent testing area, removing this variable from the measurement process. The equivalent circular test opening has an approximate diameter of 50.5 mm.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSpecimen clamping is equally important because it determines whether the measured water flow accurately represents the flow passing through the geosynthetic material. Water naturally follows the path of least resistance. If the specimen is not properly sealed around its perimeter, water may bypass the fabric through the edges instead of flowing through its structure. This edge leakage produces an artificially elevated permeability result, making the material appear more permeable than it actually is. Such an error can lead to unsafe conclusions during filter design. A rigid, dimensionally stable clamping surface maintains the specimen seal under hydraulic gradient conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAutomatic digital timing addresses another important challenge in vertical permeability testing. Fine filter fabrics may require extended periods to produce a measurable volume of water because of their low flow rates. Monitoring such lengthy tests manually can be impractical and may introduce timing inaccuracies. The QualiGTX™ GPT V automatically records the test duration, supporting consistent measurements throughout extended testing procedures.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003eVertical Geosynthetic Water Permeability Tester – QualiGTX™ GPT V Technical Specifications\u003c\/h2\u003e\n\u003ctable class=\"table table-style-align-center\" align=\"center\" border=\"1\" cellspacing=\"0\" cellpadding=\"0\" width=\"534\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTest Orientation\u003c\/td\u003e\n\u003ctd\u003eCross-plane (vertical) water flow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpecimen Test Area\u003c\/td\u003e\n\u003ctd\u003e20 cm² (equivalent to approximately ø50.5 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpecimen Clamp Construction\u003c\/td\u003e\n\u003ctd\u003eHigh-strength aluminum alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl System\u003c\/td\u003e\n\u003ctd\u003eLarge color touchscreen\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTiming\u003c\/td\u003e\n\u003ctd\u003eAutomatic, digital display\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (W × D × H)\u003c\/td\u003e\n\u003ctd\u003e720 × 700 × 1900 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e110 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Qualitest USA LC","offers":[{"title":"Default Title","offer_id":53459752812855,"sku":null,"price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0786\/1859\/1543\/files\/vertical-geosynthetic-water-perm.webp?v=1793364854","url":"https:\/\/qualitest.us\/pt\/products\/vertical-geosynthetic-water-permeability-tester","provider":"Qualitest USA LC","version":"1.0","type":"link"}