The phrase "allow it to flow" is correct and usable in written English.
You can use it when encouraging something to proceed naturally or without obstruction, often in creative or emotional contexts.
Example: "When writing, it's important to allow it to flow, letting your thoughts and ideas come out freely."
Alternatives: "let it unfold" or "permit it to stream".
The aim is to divert the river by a few metres and then allow it to flow on its natural course".
Its high viscosity will not allow it to flow as far as a water flow.
Allow it to flow downhill past the blades of a turbine, turning them as it rushes by.
Like Keystone XL, the Northern Gateway project would carry tarlike bitumen from the oil sands, which is diluted with solvents to allow it to flow through pipes.
The blood is temporarily trapped in the penis by the constriction of blood vessels that would normally allow it to flow out.
The dam stores water to allow it to flow outward for a greater duration during low tides, to shove more sediment out to sea.
At some point in the coming weeks, the city plans to run its inaugural tests on water from Lake Washington, allowing it to flow through the screens of the shed-sized brick intake building that juts out on a dirt peninsula into the middle of the reservoir and, with the pull of gravity, gush through pipes into the new filtration system tanks.
Allowing it to flow opens us to our connection to source, to the ever-flowing stream of "mother energy" in the universe.
Basaltic lava, the type that erupts out of Hawaiian volcanoes, contains relatively low amounts of silicate minerals, allowing it to flow quickly and smoothly over long distances.
Stair treads, for example, are suspended within a steel lattice that looks like a veil, defining space but allowing it to flow through.
A privacy-industrial complex has sprung up from this — technology, services, and policies all aimed at trying to protect data while allowing it to flow freely enough to keep the modern electronic bazaar thriving.
