The following uses of water shall be regulated or prohibited as follows:
Watering yards. The day and time for sprinkling, watering, or irrigating of yards and grass by any method shall be regulated or prohibited as follows:
(a) Municipal water users are prohibited from watering lawns during the hours of 12 noon to 5 p.m. except pursuant to an exception granted under § 52.009.
(b) Municipal water users having even- numbered addresses may water lawns on even- numbered calendar dates. Municipal water users having odd-numbered addresses may water lawns on odd-numbered calendar dates. This annual lawn watering schedule is in effect when the water flow rate in the Big Sioux River is at 50 cubic feet per second (cfs) or more as measured at the United States Geological Survey (USGS) Cliff Avenue gauging station except pursuant to an exception granted under § 52.009.
(c) (1) Municipal water users may water lawns one day of each week when the water flow rate in the Big Sioux River as measured at the USGS Cliff Avenue gauging station is at 49 cfs or less for a period of ten consecutive days and greater than 20 cfs and the daily demand for water exceeds 42 million gallons per day (mgd). Each municipal water user will have a designated lawn watering day as determined by the manager that will best protect the water supply except pursuant to an exception granted under § 52.009.
(2) To move from one day of each week back to odd/even lawn watering restrictions, the water flow rate in the Big Sioux River as measured at the USGS Cliff Avenue gauging station will have to reach 75 cfs or greater for a period of 20 consecutive days.
(d) (1) Municipal water users will be prohibited from watering lawns when the water flow rate in the Big Sioux River as measured at the USGS Cliff Avenue gauging station is at 20 cfs or less for five consecutive days and stays below 20 cfs and the daily demand for water exceeds 34 mgd except pursuant to an exception granted under § 52.009.
(2) To move from lawn watering prohibition, the water flow rate in the Big Sioux River as measured at the USGS Cliff Avenue gauging station will have to reach 40 cfs or greater for a period of 20 consecutive days.
(e) During periods of extended dry weather, severe drought conditions, or other man-made or natural disaster conditions, the mayor at the recommendation of the manager may enact additional restrictions necessary to protect the local water supply for a period of up to 30 days.
(f) Each stage of lawn watering restriction will stay in effect until such time it is deemed safe by the manager to remove and change the status of the restrictions.
(Ord. 23-13, passed 4-16-2013)