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No official flood warning is active nearby and the closest river stations are within normal ranges.
Updated 2026-10-09 15:10:55 UTC · Official GOV.UK warnings · Flood preparation & help guide
Diss is a market town and civil parish in the district of South Norfolk in Norfolk, England. It is near to the boundary with Suffolk. It had a population of 7,572 in 2011. It lies in the valley of the river Waveney, around a mere covering 6 acres (2.4 ha) and up to 18 feet (5.5 m) deep, although there is another 51 feet (16 m) of mud.
The nearest watercourse on the river map is the River Waveney, about 10 m from the middle of Diss's gauges. It flows into the River Yare about 82 km downstream.
A gauge downstream shows water that has already passed this point; one upstream sees it first. Distances along the river are from the point on the River Waveney nearest the middle of Diss's gauges. From Ordnance Survey’s river map (OS Open Rivers), which leaves out small streams, ditches and culverts, so a nearer one may exist. This describes where water goes on the map; it says nothing about flooding at any address. Contains OS data © Crown copyright and database rights 2026.
Diss is monitored by 1 Environment Agency river level station on the River Waveney, in Suffolk. Water levels are updated every 15 minutes, providing real-time flood monitoring for the area.
The River Waveney is monitored by 1 station (Diss). Each station records water levels continuously, with data synced to FloodRadar every 5 minutes.
No Environment Agency flood warning area is mapped within 10km of Diss. That means the EA has not defined a warning target area here, which is not evidence the town cannot flood: warning areas exist where the EA runs a warning service, and surface-water and groundwater flooding have no warning areas at all.
There are 7 storm overflows within 5km of Diss. None of the 7 with a reporting monitor are currently discharging. Enable "Sewage" on the map above to see their locations.
6 of them, nearest first, with their own page of live status and past discharges:
If flooding is forecast in Diss, call Floodline on 0345 988 1188 for the latest information. Move valuables upstairs, turn off gas and electricity if safe to do so, and avoid walking or driving through flood water. Sign up for flood warnings on any station page above to receive email alerts when water levels rise. For emergency numbers, a preparation checklist and insurance guidance, see our flood help & preparation guide.
Diss gets about 617 mm of rain a year on average (wettest month August, 67 mm; driest April, 36 mm). That is 47% drier than the UK as a whole, which averages 1,163 mm a year. See the rain gauges →
A thirty-year average for the area, not a forecast and not a flood risk on its own. Source: Met Office HadUK-Grid 1991–2020 (5 km grid), 2.4 km away. Average rainfall: HadUK-Grid v1.3.2, Met Office. Contains public sector information licensed under the Open Government Licence v3.0.
Floods whose mapped extent (EA Recorded Flood Outlines) reached within ~5 km of the town centre — most recent first. These are records of mapped extents, not a full list of floods. See them on the map →
Records, not floods: no outline on the record is not evidence a place has not flooded.
Current verdict: Normal. No official flood warning is active nearby and the closest river stations are within normal ranges.
Diss has river level monitoring on River Waveney — 1 monitoring station in total.
Use the GOV.UK Check for Flooding service (check-for-flooding.service.gov.uk) or call Floodline on 0345 988 1188 (24 hours). You can also set up free FloodRadar email or browser alerts from any station page above.
Follow official advice: move valuables and vehicles to safety, never walk or drive through flood water, turn off gas and electricity if safe, and check on vulnerable neighbours. See our flood preparation guide at floodradar.co.uk/flood-help.
Yes — the Environment Agency's Recorded Flood Outlines dataset shows 5 recorded flood extents around the town centre since 1703, most recently in 2020. That is a count of mapped extents, not of separate floods. Records, not floods: no outline on the record is not evidence a place has not flooded. See the flood history link below.
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