Your irrigation controller may regulate the sprinkler system, but if it's programmed incorrectly, it can use about 1,500-2,500 gallons every time it runs. Not to mention drown your plants, promote disease and drain your wallet.

Most controllers use the same basic tools: programs, days, run times and start times. (Refer to the online manuals of some common brand-name systems for additional information.)

A quick irrigation audit will often reveal common problems that are easily solved:

• Too many days. During drought restrictions, the last number of your street address determines your watering day. Outside of drought, there is no need to water more than twice a week.
• Long run times. For pop-up sprayers in our clay soils, the recommended setting for proper coverage is eight to 15 minutes, depending on whether the zone is in sun or shade. For rotor heads, 25-30 minutes is recommended.
• Too many start times. One start time initiates the entire cycle (running every zone with a run time). Occasionally, splitting the total run time per zone into two start times may be beneficial for steep slopes.
• Multiple programs. For most residential landscapes, a single program (A, B or C) is sufficient. The rest should be off with days and times zeroed out. Note: Check all programs to make sure no extras are lurking.

SAWS offers free irrigation consultations. Call 704-SAVE (7283) for an appointment. Remember, your controller may manage the sprinkler system, but you are the brains of the operation!

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Brad Wier is a conservation consultant for San Antonio Water System.