I completely and enthusiastically agree with basher519’s comments. Add gallons/minute (or hour) flow parameter in Zone definition. In addition, define a drip nozzle type which allows you to define gallons/minute (or hour) flow rate. If this nozzle is selected for zone, display a parameter for emitters per zone. Then if flow rate parameter is undefined in zone, use emitter flow rate times no. of emitters to calculate zone flow rate. Use these zone flow rates to calculate water usages.
Forcing your customers to to do manual gallons/minute to precipitation/area conversions is unnecessary when this is precisely what your software should be doing. Every nozzle in my irrigation system has gallons/hour rating. I also know the exact flow rate of each of my zones by reading our water meter. Please let me easily incorporate this information into your software so that I can get accurate water usage numbers. I live in a small California city which is in a Stage 3 Water Rationing–we are limited to about 46 gallons per person per day. Exceeding this amount results in severe fines and penalties. Most people here now use drip irrigation. For us, water usage is critical, and it appears that the Rachio could provide this information easily and with minimal changes to your software.
Please make incorporation of these features a high priority for your next release. Thanks.