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Direct most of the water to open areas rather than those containing plants you’re worried about protecting. The smell of moist soil will help attract snails to your garden, where you’ll have traps waiting for them. You want your trap to be deep enough to make it tough for snails to escape once they’re inside, but not so large they’re difficult to put in place. Bowls and saucers with steep sides make good bases, as do the kinds of plastic containers that products like yogurt and ice cream are sold in.  For example, you could use a tuna or catfood can, both of which are great options for traps. If you’re interested in a heavier-duty solution, you can buy lidded snail traps from most gardening centers for as little as $10. Use a hand trowel to make a depression in the soil deep enough to anchor your makeshift trap. That way, when a snail comes along, it will tumble right into the container rather than being forced to climb the side.  Shallow containers will obviously be easier to bury, and won’t be as disturbing to the soil in your garden. Avoid sinking the edging of the container flush with the soil. This can cause other beneficial insects like beetles and lacewings to fall in by accident. Pour the beer to just below the top of the trap. Then, leave the trap to sit in one of the central areas of your garden overnight. Snails that come close to get a taste will find themselves swimming in the liquid with no way out.  Any type of beer will do the trick, but cheaper varieties will probably be best, since you’ll just be throwing it away when you’re done. You can also use a mixture of yeast and honey if you don’t happen to have any beer on hand. It’s actually the yeast that snails find so alluring, rather than anything in the beer itself. Each trap will only be effective for luring snails from a distance of about 3 feet (0.91 m). It may therefore be necessary to use more than one if you’re combating an extensive infestation, or your garden is spread out and covers a lot of ground. Be sure to empty and refill your trap every day or every few days until you’ve got the problem under control. After polishing off a grapefruit with your breakfast, leave half of the hollowed-out fruit in an open area near your prized plants. Snails love citrus, and will clamor inside to get a taste. Once enough snails have collected inside the rinds, you can then simply remove them from you garden and dispose of them. This easy trapping method will also work with other types of citrus, but grapefruits tend to work best because of their large size.

Summary:
Hose down your garden in the afternoon or evening. Select a shallow container to serve as a trap. Bury the container so that the lip sits just about soil level. Fill the container with beer. Place several individual traps throughout your garden to trap them. Deposit grapefruit rinds throughout your garden.