influx / inlet
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influx
The appearance of many people who are interested in an event, place, or organization; great popularity or demand.
Der neue Verein hat einen enormen Zulauf an Mitgliedern.
The new club has seen an enormous influx of members.
'Der Zulauf' is the nominalization of the verb 'zulaufen' (to run/flow toward). It is made up of 'zu' (toward) and 'laufen' (to run) and describes movement toward something — either of people or of liquids.
Der Zulauf von frischem Wasser in den Teich ist wichtig für die Fische.
The inflow of fresh water into the pond is important for the fish.
You can easily distinguish the two meanings from context. If people, members, or customers are being discussed, it refers to popularity. If the context is technology, pipes, or containers, it refers to the inflow of a liquid.
Der Tag der offenen Tür hatte einen großen Zulauf.
The open house had a large turnout.
When describing who or what makes up the influx, the preposition 'an' with the dative is often used. Typical verbs are 'haben' (to have), 'erleben' (to experience), or 'verzeichnen' (to record/register).
Die Universität verzeichnet einen starken Zulauf an internationalen Studierenden.
The university is recording a strong influx of international students.
demand / inquiry
'die Nachfrage' and 'der Zulauf' can both express that many people are interested in something. 'Nachfrage' fits especially with products, services, and prices. So you are asking how many people want to buy or book something. 'Zulauf' is used more when many people come to a place, an event, or an organization. It focuses more on people showing up or taking part. Learners may confuse the words because both can show popularity. For goods and offers, 'Nachfrage' is often more precise; for clubs, courses, or events, 'Zulauf' sounds more natural.
Der Sportverein hat seit dem Sommer viel Zulauf von neuen Mitgliedern.
The sports club has had a large influx of new members since the summer.
Nach der Preissenkung war die Nachfrage nach dem Handy wieder größer.
After the price reduction, demand for the phone increased again.