Mir scheint backwater passend.

Vgl.

.This contribution presents the development, implementation and evaluation of a method for modelling backwater effects based on a hydrological flood routing approach and a backwater volume routing according to the water level slope. The developed method computes the backwater effects in two steps. First, the inflow from sub-catchments and the non-backwater affected flood routing processes are computed. Secondly, the afflux conditions are calculated which cause backwater effects in upstream direction. Afflux conditions occur mainly at tributary inlets or control structures (for example, tide gates, weirs, retention ponds or sluices).

Computation of backwater effects in low lying (marshland) catchments - a re-usable and efficient method in an open source hydrological model - NASA/ADS (harvard.edu)

I'm not an expert in these matters but "backwater" sounds rather strange to me. I know that it's the name given to the increase in water depth upstream of a weir or other obstacle but this is a very technical usage that would not be immediately understood by lay people. I note that it's also more commonly used as an adjective, as in backwater effects in #2.

Depending on context, I therefore feel that I'd be tempted to translate Rückstau differently, as in:

The closure of sluice gates leads to water backing up in the tributaries

Floods result from the backing up of water at sluice gates

https://www.collinsdictionary.com/dictionary/...

Collins erklärt backwater so:

1. A backwater is a place that is isolated.

...a quiet rural backwater.

Synonyms: isolated place, backwoods, remote place, sleepy town

2.If you refer to a place or institution as a backwater, you think it is not developing properly because it is isolated from ideas and events in other places and institutions.

in British English:

1. a body of stagnant water connected to a river

2. water held or driven back, as by a dam, flood, or tide

3. an isolated, backward, or intellectually stagnant place or condition

in American English:

1. water moved backward or held back by a dam, tide, etc.

2. stagnant water in a small stream or inlet

3. a place or condition regarded as stagnant, backward, etc.

Collins übersetzt backwater mit "(lit) Stauwasser nt, totes Wasser; (fig) rückständiges Nest"

Thanks a lot for all the replies.

#4 in American English:

1. water moved backward or held back by a dam, tide, etc.

That is it.

But I agree with FernSchreiber, The closure of sluice gates leads to water backing up in the tributaries, makes a much better translation.

Vielen Dank, das ist wirklich hilfreich.

Und Sorry fuer die spaete Antwort.