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[[Image:Tyrolean_weir_icon.png|right]]
[[Image:Tyrolean weir.JPG|thumb|right|250px200px|Tyrolean weir|Man checking the grid at a Tyrolean Weir. Tanzania. Photo: D. Bourman, Aqua for All.]]
A Tyrolean weir is a water inlet structure in which water is abstracted from the main flow through a screen over a gutter. The gutter is usually made of concrete and built into the river bed. The screen on the crest should slope downstream (15-30 degrees), to increase flow velocities and prevent sediment carried by the stream from blocking it. From the gutter, water enters a pipeline, which drains into a sedimentation tank and then flows by gravity into the rest of the system.
==Construction, operations and maintenance==
[[Image:Tyro weir.jpg|thumb|right|250px200px|Tyrolian weirs are meant to intake water from mountain rivers that are very turbulent. Photo: [http://www.iahr.org/membersonly/grazproceedings99/doc/000/000/080.htm Vienna University of Technology]]]
A Tyrolean weir can either consist of parallel rods or a perforated plate, installed in the flow direction over the width of the stream with a 15-30 degree downward slope. Large stones, branches and large leaves cannot pass between the rods, and are prevented from entering the gutter. Because the rods / plate slopes downward, the material in the stream is pushed downstream, until it drops over the end of the weir.
* Material (excluding the pipe and sedimentation tank): US$ 300 - 600.
* Labour (if site is easily accessible): 30 - 50 man days.
==Field experiences==
==Manuals, videos, and links==
==Acknowledgements==
* CARE Nederland, Desk Study: [[Resilient WASH systems in drought-prone areas]]. October 2010.