Use electric timers to turn the system on and off. Battery operated units that screw onto outdoor faucets are inexpensive and simple to use. Plug-in timers that control electric valves are more economical for multiple zone systems. The system parts fit together without special tools and can be hooked up to any outdoor faucet. A. Not exactly.
Soaker hoses use the same concept, but they are generally much less efficient.
Their flow rates vary widely and result in uneven watering. Not if you use inexpensive filters and new types of emitters that flush out debris and resist plugging. Not if the system is well-planned and the garden tended by someone who knows about the system. Since a drip system can be installed above ground, it's cheaper to put in than sprinkler systems. Once installed, it can pay for itself in time and water savings.