Een 1D hydraulisch model werd opgesteld van (een gedeelte van) de Nyemba rivier om een aantal scenario’s voor deze geplande doorsteek door te rekenen, i.e. verschillende doorsteekbreedtes en verschillende debieten. Het uitgraven van een doorsteek verandert de hydraulische condities (bijv. het waterpeil) onder de spoorwegbrug niet. Een doorsteek met een breedte B = 10 m leidt evenwel reeds 35% van het debiet af via de doorsteek; bij een grotere breedte zal slechts bij was een redelijk debiet doorheen de meander stromen.
Aan de hand van de berekende sectiegemiddelde stroomsnelheden is de dimensionering van de oeverbescherming uitgevoerd. Uit deze dimensionering volgt dat in de meander geen bijkomende oeverbescherming dient te worden voorzien. Ter hoogte van de splitsing van de rivier in de doorsteek en de meander en ter hoogte van de samenvloeiing van de doorsteek en de meander dient wel een oeverbescherming aangebracht te worden over een minimale totale lengte van 88 m, i.e. 35 m opwaarts en 53 m afwaarts van de splitsing of de samenvloeiing. Ter bescherming van de fundering van de brugpijler dient een bodembescherming aangebracht te worden. Deze bodembescherming dient vormgegeven te worden volgens de nieuwe hoofdstroomrichting, i.e. via de doorsteek. Bijkomend dient een bodembescherming voorzien te worden over een lengte van zo’n 7.5 m opwaarts van de pijler en zo’n 13 m afwaarts van de pijler, met een totale breedte van 17 m (inclusief de breedte van de pijler). 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