Grendon Underwood water level

What this means

The River Ray at Grendon Underwood is running below normal at 0.03 m.

That puts it 0.03 m below the median of 0.05 m for mid-October, based on 21 years of readings. A year ago it stood at 0.01 m (+0.02 m).

The level has held steady over the past 24 hours. Without real rain upstream, that is unlikely to change quickly. In the last month it has stayed between 0.02 m and 0.04 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

0.05 m0.03 m below the median for this date

Normal for this date

0.01 m – 0.13 m8 years in 10 fall in this range (21 years of records)

Normal range

0.01 m – 0.94 m

Same day last year

0.01 m+0.02 m

Lowest and highest in 30 days

0.02 m – 0.04 m

Lowest and highest in 12 months

−0.19 m – 0.61 m

Highest on record

1.86 mJune 3, 2008

Lowest on record

−0.21 mNovember 16, 1990