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Een groot deel van ons land ligt onder de zeespiegel en dat maakt ons kwetsbaar voor overstromingen. Om overstromingen te voorkomen, hebben we in Nederland vele kilometers aan primaire en regionale waterkeringen om het land te beschermen. Zo ook in de provincie Noord-Holland. Bij het falen van een kering zoals een dijk langs een kleine rivier kan de weg onder water komen te staan. Hierdoor worden deze wegen onbegaanbaar. Ook kan de weg opdrijven of zelfs verzakken. De draagkracht van de wegfundering neemt af als deze is verzadigd met water. Als de (grond)waterstand hoog wordt en de weg zwaar belast wordt, kan dit permanente schade toebrengen aan de (vaar)wegen. Het overstromingsbeeld van de Provincie Noord-Holland is een T-100 situatie, dat wil zeggen een overstroming die gemiddeld eens in de 100 jaar voorkomt. Of een plek in het achterland nat wordt en hoe snel dit gebeurt na de dijkdoorbraak, is afhankelijk van de ligging, hoogte en inrichting van het gebied. De kans op een overstroming op een gegeven locatie is niet af te leiden met behulp van deze kaarten. Deze kans is (naast de inrichting van het achterland) ook afhankelijk van de doorbraakkans van de waterkeringen. 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