UGT IL-2700, Руководство пользователя, Страница: 11 / 32

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The effective hydraulic pressure head on the soil surface is determined from the height of the
water table in the standpipe [4] and from the negative pressure at the U-tube manometer [8].
For this, the zero point of the scale on the standpipe is at soil surface level.
Attention!
For an exact measurement of the water tension in the soil the bottom edge of the hood
needs to be exactly on the same level as the soil surface. For unstable soils the rest of
the hood needs to be supported additionally (ring with bearing).
Fig. 2: Schematic setup of the Hood Infiltrometer
1 Fine sand sealing
2 Plastic hood
3 Buffer vessel
4 Standpipe
5 Infiltration reservoir
6 Bubble Tower
7 Air intake pipe
8 U-tube manometer
9 Hose connection 1
10 Vent pipe
11 Hose connection 2
12 Stand
B Filling level of the bubble tower
Hk Distance between soil surface and air outlet
Hs Water level in the standpipe
I Maximum filling level of the infiltration reservoir
K Valve for cutting off the pipette ball
P Pipette ball
T Immersion depth of the air intake pipe
Us height difference at the U-tube manometer
V1 Valve for separating the water volumes
V2 Valve for separating the air volumes
V3 Valve for pressure adjustment
Z Filling height of the infiltration reservoir