System Supply Type | Water Supply Alert Conservation Level 1 | Water Supply Warning Conservation Level 2 | Mandatory Conservation Level 3 | Emergency Conservation Level 4 |
U.S. Drought Monitor indicates abnormally dry in our area | U.S. Drought Monitor indicates severe drought in our area | U.S. Drought Monitor indicates extreme drought in our area | U.S. Drought Monitor indicates exceptional drought in our area | |
Run-of-River
(Measure stream flow daily and inventory watershed for upstream water users during a water shortage situation.) | (A) Steam Flow less than 180 cubic feet per second (B) Water demand does not exceed gravity flow at the intake (C) Gravity flow into the intake screens is adequate to meet pumping demand (D) 6 Days of normal demand remaining in Presettling Impoundment (E) Average daily use greater than 11 MGD for 5 consecutive days (F) Withdrawing 10% of flow past the intake (G) Presettling Impoundment is 5 feet down from full pond. 61 MGD supply remaining* | (A) Steam flow less than 100 cubic feet per second (B) Water demand exceeds gravity flow at the intake (C) Supplemental pumps are put into operation with some gravity flow in intake (D) 6 Days of normal supply remaining in Presettling Impoundment (E) Average daily use greater than 10 MGD for 5 consecutive days (F) Withdrawing 17% of flow past the intake (G) Presettling Impoundment is 9 feet down from full pond. 48 MGD supply remaining* | (A) Steam flow less than 75 cubic feet per second (B) Water demand exceeds gravity flow at the intake. Intake screens more than 12 inches out of water (C) Supplemental pumps are in operation with limited gravity flow in intake (D) Less than 6 Days of normal supply remaining in Presettling Impoundment (E) Average daily use greater than 7 MGD for 5 consecutive days (F) Withdrawing 20% of flow past the intake (G) Presettling Impoundment is 13 feet down from full pond. 36 MGD supply remaining* | (A) Steam flow less than 40 cubic feet per second (B) Water demand exceeds gravity flow at the intake. Intake more than 24 inches out of water (C) Only supplemental pumping will get water into wetwells (D) Less than 6 Days of normal supply remaining in Presettling Impoundment (E) Average daily use greater than 2 MGD for 5 consecutive days (F) Withdrawing 5% of flow past the intake (G) Presettling impoundment is 17 feet down from full pond. 25 MGD supply remaining* |
Notes:
* Presettling Impoundment volumes based on September 2003 Dewberry Davis Study. | ||||
(A) Triggers in the table above are to be used as guidelines and actual conditions may dictate some variations from the guidelines listed above. Any one or more of the trigger guidelines may be sufficient to implement conservation stages if an immediate situation threatens public health, public safety, or has potentially severe economical impacts.
(B) Triggers for conditions such as operational difficulties at the water plant, contamination, water line breaks, and power failures may lead to Emergency Level 3 by the instant severity of the situation creating nearly instantaneous water shortage.
(Ord. passed 5-18-10)