Spui bụ a? N'iburu ajụjụ nke mbụ n'uche, dee ihe gbara ya gburugburu bụ́ nke ga-enye azịza ya. Ọ nwere ike ịbụ 1 - 20 ahịrịokwu. Ihe ndị gbara ya gburugburu:
Hydrography nke ugbu a delta na-chara site delta isi ogwe aka, disconnected ogwe aka (Hollandse IJssel, Linge, Vecht, wdg) na nta osimiri na iyi. E mechiwo ọtụtụ osimiri ("dammed") ma na-eje ozi ugbu a dị ka ọwa mmiri maka ọtụtụ polders. Iwu nke Delta Works gbanwere Delta na ọkara nke abụọ nke narị afọ nke 20 kpamkpam. Ugbu a mmiri Rhine na-asọba n'oké osimiri, ma ọ bụ banye n'ọnụ mmiri mmiri ndị dịbu adị ugbu a site n'oké osimiri, n'ebe ise, ya bụ n'ọnụ mmiri nke Nieuwe Merwede, Nieuwe Waterway (Nieuwe Maas), Dordtse Kil, Spui na IJssel.