Agricultural Expansion-Induced Infiltration Rate Change in a West African Tropical Catchment

Figure 2

Schematic setup of the Hood infiltrometer [34]. (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: the 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.