Rainflow Direction near Riga using GRASS 6.4.1

  This map was created using the GRASS 6.4.1 Hydrology program and used the elevation file to calculate rain water flow and direction.  The short black colored lines both straight and curved shows the direction and strength of rainwater flow.  The map also shows railroads in red and roads in black.  City streets in light blue.  Luckily for Riga, there are not many strong rainwater flow marks in its' region.