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Fig. 20 | Environmental Evidence

Fig. 20

From: Existing evidence related to soil retention of phosphorus from on-site wastewater treatment systems in boreal and temperate climate zones: a systematic map

Fig. 20

Number of studies using columns with soil package heights within given ranges (cm). Only the largest height in studies where several heights were used is included in the diagram. The ranges indicate flow lengths in most cases. However, this is not completely consistent for the following reasons: (1) it is not always clear whether package height or column height is reported, (2) sometimes there are ports at different heights which means that the flow length is shorter than package heights. ND: no data reported. (Three studies, using boxes instead of columns, are not included in the diagram.)

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Environmental Evidence

ISSN: 2047-2382