| |
30-Year
Sequences |
20-Year
Sequences |
11-Year
Sequences |
7-Year
Sequences |
| 1500s |
30-yr-a
(1566-1595)
Extreme sustained low flow
 |
20-yr-a
(1573-1592)
Extreme low flow period
 |
11-yr-a
(1575-1585)
Sustained below average flow
 |
7-yr-a
(1579-1585)
Most extreme 7-year low flow run in record
 |
| 1600s |
30-yr-b
(1657-1686)
Clustered run of low flow years during low-to-average period
 |
20-yr-b
(1660-1679)
Clustered run of flow years during below average period
 |
------------- |
7-yr-b
(1666-1672)
Most extreme continuously dry sequence
 |
| early 1700s |
------------- |
------------- |
11-yr-b
(1728-1738)
Nearly continuous below average flow
 |
7-yr-c
(1724-1730)
7-yr sequence of high flow followed by low
 |
| late 1700s |
30-yr-c
(1762 - 1792)
High amplitude inter-annual variability
 |
------------- |
------------- |
------------ |
| early 1800s |
30-yr-d
(1813-1842)
6-year low flow run broken by wet year
 |
------------- |
------------- |
7-yr-d
(1817-1823)
Extremely dry 6-year run with intervening wet year
 |
| mid 1800s |
30-yr-e
(1842-1871)
Extreme high amplitude variability
|
------------- |
------------- |
------------ |
| late 1800s |
30-yr-f
(1875-1904)
Sustained below average low flow
 |
20-yr-c
(1875-1904)
Long dry period with below average flow
 |
11-yr-c
(1893-1903)
Below average with extreme low flow years
 |
------------ |
| early 1900s |
30-yr-g
(1904-1934)
Sustained above average high flow
 |
------------- |
------------- |
------------ |
