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<br /> D 3385
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<br /> volume infiltrated during timed intervals is converted to an
<br /> incremental infiltration velocity, usually expressed in centime- `
<br /> tre per hour ori inch per hour and plotted versus elapsed time.
<br /> € The maximumisteady state or average incremental infiltration x
<br /> velocity, depending on the purpose/application of the test is 30 or 60 cm. din.
<br /> equivalent to the infiltration rate. 112 or 24
<br /> 5. Significance and Use
<br /> 5.1 This test method is useful for field measurement of the
<br /> infiltration rate of soils. Infiltration rates have application to
<br /> Welded butt
<br /> such studies as liquid waste disposal, evaluation of potential joint
<br /> septic-tank disposal fields, leaching and drainage efficiencies, T__
<br /> Aluminum orioy reinlorting Lona
<br /> minimum dimensions of 19mm 13/4 in.l
<br /> irrigation requirements, water spreading and recharge, and height b1 3 mm 11/8 in.1 trio.
<br /> canal or reservoir leakage, among other applications.5-2 Although the units of infiltration rate and hydraulic S0 fm
<br /> conductivity of soils are similar, there is a distinct difference 120 in.)1 l
<br /> between these two quantities. They cannot be directly related E welded
<br /> unless the hydraulic boundary conditions are known, such as
<br /> hydraulic gradient and the extent of lateral flow of water,or can
<br /> i-
<br /> be reliably estimated.
<br /> Moterials: 3 mm (1/Q in.l aluminum-
<br /> purpose The.purpose of the outer ring is to promote one- alloy sheet or materiel
<br /> dimensional, vertical flow beneath the inner ring. of similar strength
<br /> 5.4 Many factors affect the infiltration rate,for example the FIG.t Infiiltrometer Construction
<br /> soil structure, 'soil layering, condition of the soil surface,
<br /> degree of saturation of the soil,chemical and physical nature of 50 by 100 mm or 100 by 100 mm(2 by 4 in.or 4 by 4 in.),or
<br /> the soil and of Ithe applied liquid, head of the applied liquid, a jack and reaction of suitable size. .
<br /> temperature of,the liquid, and diameter and depth of embed- 6.4 Depth Gage—A hook gage, steel tape or rule, or length
<br /> ment of rings.3 Thus, tests made at the same site are not likely of steel or plastic rod pointed on one end,for use in measuring
<br /> to give identical results and the rate measured by the test and controlling the depth of liquid (head) in the infiltrometer
<br /> method described in this standard is primarily for comparative ring, when either a graduated Mariotte tube or automatic flow
<br /> use. control system is not used.
<br /> 5.5 Some aspects of the test, such as the length of time the 6.5 Splash Guard—Several pieces of rubber sheet or burlap.
<br /> tests should be conducted and the head of liquid to be applied, 150 rum(6 in.) square.
<br /> must depend upon the experience of the user, the purpose for 6:6 Rule or Tape—Two-metre (6-ft) steel tape or 300-mm
<br /> testing, and the'kind of information that is sought. (1-ft) steel rule.
<br /> 6.7 Tamp--Any device that is basically rigid, has a handle
<br /> 6. Apparatus not less than 550 mm(22 in.)in length,and has a tamping foot
<br /> 6.1 Infiltrometer Rings—Cylinders approximately 500 mm with an area ranging from 650 to 4000 mmZ(i to 6 in.2)and a
<br /> (20 in.) high and having diameters of about 300 and 600 mm maximum dimension of 150 mm (6 in.).
<br /> (12 and 24 in.)f Larger cylinders may be used, providing the 6.8 Shovels—One long-handled shovel and one trenching
<br /> ratio of the outer to inner cylinders is about two.Cylinders can spade.
<br /> be made of 3-mm(1/8-in-),hard-alloy,aluminum sheet or other 6.9 Liquid Containers:
<br /> material sufficiently strong to withstand hard driving, with the 6.9.1 One 200-L(55-gal) barrel for the main liquid supply,
<br /> bottom edge bevelled(see Fig. 1).The bevelled edges shall be along with a length of rubber hose to siphon liquid from the
<br /> kept sharp. Stainless steel or strong plastic rings may have to barrel to fill the calibrated head tanks (see 6.9.3).
<br /> be used when working with corrosive-fluids. 6.9.2 A 13-L (12-qt) pail for initial filling of the infiltrom-
<br /> 6.2 Driving Caps—Disks of 13-mm('/z-in.)thick hard-alloy eters.
<br /> aluminum with:centering pins around the edge,.or preferably 6.93.Two calibrated head tanks for measurement of liquid
<br /> having a recessed groove about 5 mm (0.2 in.) deep with a flow during the test.These may be either graduated cylinders or
<br /> ' width about lmm (0.05 in.) wider than the thickness of the Mariotte tubes having a minimum volume capacity of about
<br /> ring. The diameters of the disks should be slightly larger than 3000�-(see Note i and Note 2 and Fig. 2).
<br /> those of the infiltrometer rings. NoTF. 1—It is useful to have one head tank with a capacity of three
<br /> 6.3 Driving Equipment—A 5.5-kg (12-1b) mall or sledge times that of the other because the area of the annular space between the
<br /> and a 600 or 900-mm(2 or 3-ft)length of wood approximately rings is about three times that of the inner ring.
<br /> Non 2—In many cases,the volume capacity of these calibrated head
<br /> '. tanks must be significantly larger than 3000 mL,especially if the test has
<br /> to continue overnight. Capacities of about 50 L(13 gal) would not be
<br /> 3 Discussion of factors affecting infiltration rate is contained in the following uncDtr1n10n.
<br /> reference: Johnson,A. L,A Field Method for Measurement of Infiltration, U.S. ,
<br /> Geological Survey Watcr-Supply Paper 1544-F 1963,pp.4--9. 6.10 Liquid Supply--Water, or preferably, liquid of the '
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