Gauge Hagestein beneden — current water level and draft
Lek · km 947.11
Measurement—cm
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Gauge Hagestein beneden is on the Lek at kilometre 947.11, on the km 949.1–971.6 stretch. The OLW is -49 cm and the fairway depth maintained below it (TuOLW) is 315 cm; after deducting 30 cm of safety margin the official rule of thumb comes out at Hagestein beneden +334. In practice Hagestein beneden +350 is used here, +16 cm against the official rule. This gauge has one forecast source: the 7-day forecast from Rijkswaterstaat RWsOS (red). Upstream lies Hagestein boven, downstream Schoonhoven.
OLR and MGD at Hagestein-Beneden
According to the report 'RUIMTE VOOR DE LEK', the guaranteed depth at OLR is 315 cm. In 2012, the OLR at Hagestein Beneden was set at −0.47 m + NAP. This corresponds to a maximum draft of 315 + 47 − 30 (safety margin) = 332 cm at NAP 0. Rijkswaterstaat also guarantees the following: 'In the river reach Hagestein – Krimpen aan de Lek kmr. 946.850 – kmr. 989.200, at a water level Hagestein Beneden NAP +0.30 m, the MGD is 350 cm.' This implies a guaranteed MGD of about 320 cm at NAP 0. Because it is permitted to assume the same draft as the published MGD (without an extra safety margin), one can infer that Rijkswaterstaat effectively includes a safety margin of around 40 cm in the MGD. Both approaches therefore converge to a similar maximum draft when using the same safety margin.