North Mymms water level

What this means

Mimmshall Brook at North Mymms is well above normal at 0.36 m.

The median for mid-October is 0.27 m, based on 21 years of readings, so the river level is 0.10 m above typical. On the same day last year the reading was 0.30 m, a difference of +0.07 m. The record high is 2.35 m, set on February 10, 2009.

It has dropped 0.01 m over the past 24 hours. In the last month it has stayed between 0.34 m and 0.44 m.

Autumn rain usually starts to lift rivers again after the summer low.

Compared with 21 years of daily readings for this time of year. How to read levels

Key numbers

Median for this date

0.27 m0.10 m above the median for this date

Normal for this date

0.18 m – 0.35 m8 years in 10 fall in this range (21 years of records)

Normal range

0.05 m – 1.50 m

Same day last year

0.30 m+0.07 m

Lowest and highest in 30 days

0.34 m – 0.44 m

Lowest and highest in 12 months

0.28 m – 0.90 m

Highest on record

2.35 mFebruary 10, 2009

Lowest on record

−0.17 mMay 22, 1998