Water information what are the warning signs? _ News
Water warning signals are divided into two types of flooding, low water, according to the flood-level, low level and development trend, from low to high is divided into four levels, followed by blue, yellow, Orange, red.
Water warning signals by the warning level, icon, the standard is composed of three parts.
, Flood warning
1 Blue flood early warning signals
Standard: meets one of the following conditions.
(1) water (flow) close to the danger level (flow);
(2) the elements of flood return period of almost 5 years.
2 Flood-a yellow warning signal
Standard: meets one of the following conditions.
(1) water (flow) met or exceeded the warning level (flow);
(2) the elements of flood return period of 5 or more years.
3 Floods Orange warning signal
Standard: meets one of the following conditions.
(1) water (flow) meet or exceed the guarantee level (flow);
(2) the elements of flood return period of 20 or more years.
4 The flood red alert signal
Standard: meets one of the following conditions.
(1) water (flow) meet or exceed the highest water level in history (maximum flow);
(2) the elements of flood return period of 50 or more years.
Second, low water warning signals
1 Dry blue warning signal
Standard: meets one of the following conditions.
(1) water (flow) near the upland police (limited) level (flow);
(2) 30 days of water is more than 40% less than the same period of normal years.
2 Dry yellow warning signal
Standard: meets one of the following conditions.
(1) water (flow) fell to or below the upland police (limited) level (flow);
(2) 30 days of water is more than 60% less than the same period of normal years.
3 Dry Orange warning signal
Standard: meets one of the following conditions.
(1) water (flow) down to or less than the same period of normal years minimum (small);
(2) 30 days water is 7.5 per cent less than the same period of normal years.
4 Dry red warning signal
Standard: meets one of the following conditions.
(1) water (flow) fell to or below its minimum (small);
(2) 30 days of water is more than 90% less than the same period of normal years.
Note: in this standard return periods return period design return period or experience, data length should generally be more than 30.
Responsible editor: Sun Ailin SN146
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