of the house there is an elbow where the pipe goes up to the vacuum breaker. if this elbow has a small brass cap proceed to step 5 otherwise proceed to step 6.
5. unscrew the brass cap to drain the pipe from the house. replace the cap after the water stops flowing. proceed to step 7.
6. if you do not have the brass cap, your drain is located inside the house. there is a valve or faucet connected to the sprinkler pipe. follow the pipe from the inside wall until you find this valve. note this is a different valve than the one used to shut off the water. open 