By replacing the natural ground with an impermeable surface (such as a tarmac or block paving driveway), large amounts of rainwater have nowhere to go which increases the risk of flooding. The water can’t soak into the ground as it would have done previously, if the driveway can't be built at an angle to enable the water to run into the road drainage system you may find your driveway collecting puddles of water causing numerous problems, including flooding in extreme cases.
Trench drains are a popular solution for Driveways across the UK and can be installed where the driveway meets the garage. Trench Drains are long and narrow and usually run the entire width of the driveway. They are then covered by a grate (available in a range of colors and materials to suit your driveway) to keep it free of debris that could clog the drainage pipe. Decorative grates are available for trench drains that can be used as a unique design element.