# With what unit are river flow speeds indicated on the Genshtab Soviet military maps?

On the Genshtab (Генштаб) Soviet military maps, I can read that this ford through the stream Вертный has a stony bottom, a depth of at most 4 dm, and a width of 29 m (under typical circumstances)¹. That is indeed fordable. It also indicates that the flow velocity is 0.6, but I can't find anywhere what unit the velocity is in. I've found an English language legend as well as a more detailed Russian language legend — screenshot below — but neither appears to describe the units. I would expect it to be km/h, but it might be m/s, which is a factor 3.6 different. What unit is it in? I'm starting to learn Russian but I don't understand enough yet to find this information.

I'm sure the quantity is speed and not total flow, because this small mountain stream (15 metre wide, 0.5 metre deep) has 2.5 speed units, whereas this river downstream (1310 metre wide, 10 metre deep) has 0.4 speed units.

¹These maps are awesome… where else in the world can you find such detail on topographic maps? Sorry, that's not my question here but I just wanted to say that :)

• I read no Russian but a further possibility is the volume flow in cubic metres per second - this is how river flows are often measured elsewhere Jan 19, 2019 at 20:04
• @ChrisH No, it must be speed: this small stream in the mountains has 2.5, whereas far downstream near the mouth of the main river the value is 0.4. Jan 19, 2019 at 21:25
• good, that helps. Your example in the question just happened to be plausible in those units. Of course depth and speed matter directly for fording, in a way that total flow doesn't - but total flow matters for other things. Jan 19, 2019 at 21:45
• @ChrisH I've edited the information into the question. Jan 19, 2019 at 21:55
• @gerrit I don't see any fords on the map link you've provided - 29/0.4K does describe the river, but it doesn't mean there's any ford. Fords it's a "бр." supplied with details. Jan 20, 2019 at 9:52