Patios are wonderful things to have outside the home to relax in nice weather, have dinner under the stars or get a tan in the sun. They are usually made of concrete, brick or stone---all reliable materials. However, proper drainage is important, because rain water runs off into it and flood or erode the patio if it doesn't have anywhere to flow.
Patios should be constructed so that they are angled ever so slightly so that when water hits them, it flows to the edge of the patio where drains can be set up. These drains can consist of circular drains dotting the edges of the patio or long troughlike drains such as the narrow ones around a pool that efficiently collects water but doesn't stand out aesthetically. These drains can also feed the water directly into a surrounding yard or flower bed, so that they can be watered, or run the water into a gutter that disperses elsewhere on the property.
The patio can also be constructed in a way in which all the water flows to the middle but can't be felt by anyone who is actually standing or sitting on the patio itself. A drain can be installed at the very centre of the patio so that when it rains all the water flows naturally to that central drain. This drain can be covered with a table, so that the water can still reach it but people won't have to look at it. The drain can distribute the water to the yard or garden around the patio.
For larger patios or patios that are built entirely flat, build numerous drains along the surface of the patio or along the side of any kind of wall or border around the patio. These drains can be small and nondescript so that they do not stand out as much to people. One of the main ways to do this is make the drains the same colour as the surface of the patio itself and put them in areas that aren't necessarily walkways. Drains that are evenly spaced out across the surface area of the patio itself are also a good way to hide this series of smaller drains.