Main characteristics of the 14 watercress beds studied in 2016–2018 in northern Haute Vienne, with indication of the number of Fasciola hepatica metacercariae.
|Type of watercress bed||Length of the macrophyte-free zone (m)||Number of beds||Length of the bed in m (area in m2)||Flow speed (cm/s)*||Number of cysts over 3 years
|With a slow-flow spring||0.13–0.24||3||6.6–9.2 (2.9–4.1)||0.5–1.7||89||29.6 (17.3)|
|1.1–1.8||2||6.3–7.9 (2.8–3.5)||0.9–2.1||81||40.5 (27.5)|
|3.1–3.5||2||7.8–9.5 (3.5–4.2)||0.7–1.6||50||25.0 (12.5)|
|With a faster-flow spring||0.15–0.29||2||6.4–6.9 (2.8–3.1)||5.2–6.7||93||46.5 (15.2)|
|1.3–1.6||2||8.1–11.2 (3.6–5.0)||4.3–7.2||51||25.5 (8.4)|
|3.0–3.2||3||9.3–12.2 (4.1–5.4)||5.4–8.2||4||1.3 (0.4)|
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