Any guides on new sluice?

[Keeper Of Insanity]

I really want to use new sluice, butcant figure out in which case I should use it instead of floodgates.

[Amazingdeath]

Its basically an automated floodgate that you can use to control water levels downstream as well as prevent badwater contamination

[Alcator]

Primary use of floodgates NOW is if you want water to flow through a river, but to be above a certain height. For instance, you have a very weak water source pouring into a wide river. Normally, the water would only be 0.1 height in the river, but floodgates across the entire with towards the end of that 'river', all of them synchronized and set to 0.7 height, will ensure you get 0.7 (or up to 0.8) of water.

Sluicegates, thanks to their AUTOMATIC nature, allow you to handle badtides and droughts without having to be laser-focused on the mechanism during the transitions from normal season to drought/badtide.

The general idea is that you have an incoming "river" which you want to flow into your settlement / fields, but when a badtide comes, you want to redirect it away from your settlement or fields.
For this purpose, you need to establish a 'side channel' into which you will be redirecting it. Most common way to do this is to unlock and produce dynamite, and blow a channel out of a map or at least away/around your precious lands.

Schematically (# = land, W = water flowing from top to bottom, _ = empty channel)

##WWWWW## <-- this is the incoming water


#WWWWW#_____# <-- at a suitable spot, you create the 'redirect channel'

and then you place two lines of sluice gates (marked as "[]") -- one across the normal channel, and one across the empty redirect channel:

#[]##[]#
#WWWWW#________#

And you set them up as follows:

1: CLOSE above Contamination 5% (no other checkboxes filled)
2: CLOSE below Contamination 4% (no other checkboxes filled)

What this will do is that once badwater comes during badtide, the side channel will open and the badwater will start flowing into it, and almost immediately after that, the 'normal' channel will close, saving your fields and town. Then, when normal water returns and dilutes the contamination enough, first the normal channel will open and then the side channel will close. You could of course also use values "above 3%" and "below 1%", if you are super afraid of badwater, but usually the 5% threshold is quite safe.

[Arcadaeus]

when you want it to be on the bottom of the dam or you want to automate things
they can close when a certain badwater percentage is reached without player input.
they can also be set to close at a height downstream
and water cant flow through them from the grill direction

setting them to 1% or 100% badwater is the most useful
close at 1% closes when contermination happens and protects your water storage
Open at 1% will lead bad and mixed water out your system
Open at 100% is only useful to store pure badwater for your Industry

You can also set them to a waterheight below them so they close at that height
They can manage your drought and badtide automaticly, but with iron cost are mid to late game.

in many cases you can replace floodgates with them later.

[oyssoyss]

you want to

keep water level upstream, use floodgates.
keep water level downstream, use sluice

[LotR[Henchman]]

Want to keep a water-farm irrigated? - Use a sluice gate on the bottom of a water reservoir, set to under 1 heigth.
Redirection of bad-water was already shown.
Want to have water reservoir feeding into power gen? Sluice Gate at bottom + dam on top, with the sluice gate set to let less water through than is feeding into the reservoir. Though to be honest, i don't think the concept really works, with how fast a reservoirs empty.
Want to priotise water distribution? Sluice Gates on different heights of a dam, draining less than is flowing in.
Want "deeper" reservoirs you can drain? Sluice Gates at the bottom.