OASIS Water Management

Advanced ET Specifications

1. Advanced ET (evapotranspiration) is an add-on software module. The software shall be operational with the Evolution Central and Central-Lite software programs.
2. The Advanced ET software module shall provide an automated ET driven water management capability where all irrigation schedules are automatically generated based upon dynamic plant water needs. The software shall operate under the Evolution Central Software Program. The Advanced ET software module may be added to the central system program at any time.
3. The software shall allow the user to establish station parameters including precipitation rate, distribution uniformity, monthly plant crop coefficients, root zone depth, soil type, site microclimate, management allowable depletion, plant stress factor, and slope degrees.
4. The software shall allow the user to define satellite operating constraints including allowable water days, water windows, electrical constraints (maximum simultaneous stations on), and hydraulic constraints (maximum GPM).
5. The software shall allow any station to be programmed to utilize a pump and/or master valve. The master valve may be normally open or either of two normally closed master valves. A master valve time delay of 1-600 seconds may be selected. 
6. Based on established parameters, operating constraints, weather factors, and recent irrigation events, the software shall on a daily basis, automatically determine the water days, station runtimes, and frequency of application insuring that no water loss occurs due to runoff, or deep percolation.
7. The software shall account for all water entering the root zone including scheduled irrigation, manual irrigation/station testing, as well as effective rainfall.
8. The software shall account for all moisture leaving the root zone based upon daily ET, the specific plant type material taking into consideration seasonal plant water usage requirements.
9. The software shall account for any missed irrigation cycles (e.g. satellite power outages, mow days, no water windows, scheduled system shutdowns) and automatically "make-up" for lost irrigation needs.
10. The software shall display 'Current Values' for each station's water management status. Current Values shall display Total Run Time, Maximum Cycle Run Time, Water Today, and Percentage of Moisture Lost (in the root zone).
11. The software shall display a 'What-If Scheduling Analysis' showing projected water usage on a weekly and monthly basis. Projections are based upon either the last 30-day average ET or any user selected ET value. Analysis for each station includes cycles per day, runtime per day, maximum cycle before runoff, skip days, and weekly/monthly volumes and runtimes.
12. The software shall provide a 'Display Today's Irrigation' feature. This shows scheduled irrigation including station start times, total runtime, and cycle times.
13. The software shall provide safeguards to warn the operator for water window violations, excessive depletion of root zone moisture (station brownout), and operator entry errors resulting in scheduling inconsistencies or anomalies.