Irrigation Head, Overspray, Irrigation Repair, Watering, Lawns, Grass, Rain Bird, Hunter, Toro, Irrigation Company
To figure how much water is coming out of your garden hose.  Put a coffle can under the sprinkler for a 1/2 hour, then measure the amount of water in the can.  Then divide by 7 days and you will know how long you need to keep the water on for each area to be covered to reach 1-2" per week.  So if the can measures 1/4" of water for every 1/2 hour you would need to water that area 4 days per week at 1/2 hour rate would give you 1" of water, and can adjust from that point. 
There are many ways to water your landscape.  Manual watering with a garden hose can be an effective way but time consuming.  A Home Depot or Lowes  sell a wide variety of water timers that can be easily attached to the outdoor faucet.  Drip hoses also work well for gardens or large plantings and help conserve water.

Underground Automatic irrigation systems are the most efficient.  Rotary Head, Spray Head, Mister Heads and Drip Irrigation can all be programmed.  Companies Like Rain Bird, and Hunter are two manufactures of irrigation products. 

Installation of a complete irrigation system requires many special tools and equipment and is not considered a DIY project and is best left to the professionals, however, it would be money well spent as maintenance on an installed system is healthily low after the install.

Hose Clamp
Clamp Crimper
Irrigation Adjusting Wrench
Repairing Irrigation Heads, or Adjusting Irrigation Heads requires a hose clamp, Clamp Crimper and Adjusting Wrench.
Other ways of watering include water collection systems that use roof run off or another source of rain water collection and can be used as a source of irrigation, and is a great DIY Project.
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Water is one of our most basic elements and is the most important factor when tying to fix or maintain a landscape.  Without consistent watering practices it would be impossible to grow or maintain grasses and other plants.  Most plants require 1"-2" of water per week during the growing season.  To maintain grass successfully water must be available to the plant as a delicate balance must be established between amount, frequency and type of application.  Too much water is just as bad as too little water.