A water drainage device adapted to be inserted into a circular water pipe, said water drainage device comprising a main body comprising: - a first surface adapted to face the flow of water in said circular water pipe; - a pipe contacting section having an edge with a shape adapted to lie substantially flush with the inner profile of said circular water pipe to prohibit water from flowing past said pipe contacting section; - a water inlet arranged in said pipe contacting section and adapted to face the water flow in said circular water pipe; - a water outlet adapted to be connected to a water removal means; - a first part, connecting to a first end of a second part, said second part further comprising a second end connecting to a first end of a third part comprising said pipe contacting section, said second part having a curved shape whereby the second end of said second part is adapted to be arranged further upstream of said water flow than said first end upon inserting said water drainage device; wherein said first part and said third part comprises substantially planar surfaces arranged to face the direction of the flow of water; wherein said first part and said third part are adapted to face the flow of water in said circular water pipe and their length extensions are adapted to be arranged substantially perpendicular to said water flow and/or circular water pipe; - a water drainage channel, extending through the main body from the water inlet to the water outlet, adapted to enable water to be drained from said circular water pipe, said main body further comprising a width dimension, between the first surface and a second surface arranged on the opposite side of the first surface, with respect to intended direction of the water flow, that enables the device to be inserted into the circular water pipe through open seams or open joints in said circular water pipe. - a first surface adapted to face the flow of water in said circular water pipe; - a pipe contacting section having an edge with a shape adapted to lie substantially flush with the inner profile of said circular water pipe to prohibit water from flowing past said pipe contacting section; - a water inlet arranged in said pipe contacting section and adapted to face the water flow in said circular water pipe; - a water outlet adapted to be connected to a water removal means; - a first part, connecting to a first end of a second part, said second part further comprising a second end connecting to a first end of a third part comprising said pipe contacting section, said second part having a curved shape whereby the second end of said second part is adapted to be arranged further upstream of said water flow than said first end upon inserting said water drainage device; wherein said first part and said third part comprises substantially planar surfaces arranged to face the direction of the flow of water; wherein said first part and said third part are adapted to face the flow of water in said circular water pipe and their length extensions are adapted to be arranged substantially perpendicular to said water flow and/or circular water pipe; - a water drainage channel, extending through the main body from the water inlet to the water outlet, adapted to enable water to be drained from said circular water pipe, said main body further comprising a width dimension, between the first surface and a second surface arranged on the opposite side of the first surface, with respect to intended direction of the water flow, that enables the device to be inserted into the circular water pipe through open seams or open joints in said circular water pipe.