Map Llifogydd a Ddiweddarwyd ar gyfer Pecyn Sylfaenol Dŵr Arwyneb
The surface water flood maps give an indication of the broad areas likely to be at risk of surface water flooding. This includes flooding that takes place from the surface runoff generated by rainwater (including snow and other precipitation) that: (a) is on the surface of the ground (whether or not it is moving), and (b) has not yet entered a watercourse, drainage system or public sewer. The Flood Map for Surface Water pick out natural drainage channels, rivers, low areas in floodplains, and flow paths between buildings. But it does not indicate flooding caused by local rainfall. It does not show flooding that occurs from overflowing watercourses, drainage systems or public sewers caused by catchment-wide rainfall events or river flow. A national model has been run for 1 in 30, 1 in 100 and 1 in 1000 year rainfall events. It has been modelled on a 2 metre square grid. Lead Local Flood Authorities were consulted and where available locally held model outputs have been incorporated into the maps. This dataset has been superseded by the new National Flood Hazard Maps 2019 - NRW_DS124790
- Dull adnabod
- Rhychwant
- Dosbarthiad
- Ansawdd
- Allweddeiriau
- System Cyfeirio Gofodol
- Cynnwys
- Cyfyngiadau
- Cynnal a chadw
- Metadata
Dull adnabod
- Dynodydd
- NRW_DS116273
- Teitl Amgen
-
- Surface Water Flood Risk 1000.LYR
- Surface Water Flood Risk 100.LYR
- Surface Water Flood Risk 30.LYR
- Risk of Flooding from Surface Water
- AfA375 Updated Flood Map for Surface Water Complex Package
- Laith Metadata
- English
- Datganiad
-
The Flood Map for Surface Water is in vector (polygon) format and includes the following component layers: 1. EXTENTS - three layers showing extent of flooding for three separate probabilities : 1 in 30 (high risk), 1 in 100 (medium risk) and 1 in 1000 (low risk) chance of flooding in one year, 2. DEPTHS - three banded layers showing depth of flooding for three separate probabilities: 1 in 30 (high risk), 1 in 100 (medium risk) and 1 in 1000 (low risk) chance of flooding in one year, 3. VELOCITY - three banded layers showing flooding velocity for three separate probabilities: 1 in 30 (high risk), 1 in 100 (medium risk) and 1 in 1000 (low risk) chance of flooding in one year, 4. HAZARDS - is the Hazard rating and is a function of depth and velocity for the particular scenario using the Hazard Rating formula HR = d x (v + 0.5) + DF where HR is hazard rating, d is depth, v is velocity and DF is a debris factor. 5. FLOW DIRECTION (25m) - three banded layers showing flood flow direction (at maximum velocity) for three separate probabilities: 1 in 30, 1 in 100 and 1 in 1000 (created from resampled 25m raster grid) 6. SUITABILITY - one layer showing basic confidence information from the modelling which gives an indication of the scale at which is it generally appropriate to use this information to assess flood risk and parameters used. This dataset is not suitable for identifying whether an individual property will flood. Because of the way they have been produced and the fact that they are indicative, the maps are not appropriate to act as the sole evidence for any specific planning or regulatory decision or assessment of risk in relation to flooding at any scale without further supporting studies or evidence.
- Gwybodaeth ychwanegol
-
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/297432/LIT_8988_0bf634.pdf
- Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
- 2016-10-17
Rhychwant
Rhychwant
- Hyd
- Wales (WLS)
))
Dosbarthiad
- Fformat - Math a Disgrifiad
-
-
Geographic Information System
(
)
- Math
-
ESRI Geodatabase
-
Geographic Information System
(
)
Ansawdd
Ansawdd Data
- Cwmpas Ansawdd
- Dataset
- Cydymffurfiad
- Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
- Eglurhad
-
This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
- Gradd
- false
- Datganiad
-
The Flood Map for Surface Water is in vector (polygon) format and includes the following component layers: 1. EXTENTS - three layers showing extent of flooding for three separate probabilities : 1 in 30 (high risk), 1 in 100 (medium risk) and 1 in 1000 (low risk) chance of flooding in one year, 2. DEPTHS - three banded layers showing depth of flooding for three separate probabilities: 1 in 30 (high risk), 1 in 100 (medium risk) and 1 in 1000 (low risk) chance of flooding in one year, 3. VELOCITY - three banded layers showing flooding velocity for three separate probabilities: 1 in 30 (high risk), 1 in 100 (medium risk) and 1 in 1000 (low risk) chance of flooding in one year, 4. HAZARDS - is the Hazard rating and is a function of depth and velocity for the particular scenario using the Hazard Rating formula HR = d x (v + 0.5) + DF where HR is hazard rating, d is depth, v is velocity and DF is a debris factor. 5. FLOW DIRECTION (25m) - three banded layers showing flood flow direction (at maximum velocity) for three separate probabilities: 1 in 30, 1 in 100 and 1 in 1000 (created from resampled 25m raster grid) 6. SUITABILITY - one layer showing basic confidence information from the modelling which gives an indication of the scale at which is it generally appropriate to use this information to assess flood risk and parameters used. This dataset is not suitable for identifying whether an individual property will flood. Because of the way they have been produced and the fact that they are indicative, the maps are not appropriate to act as the sole evidence for any specific planning or regulatory decision or assessment of risk in relation to flooding at any scale without further supporting studies or evidence.
Allweddeiriau
Allweddair
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2008-06-01
Allweddair
-
NRW Thesaurus
-
- flood modelling
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2024-06-19
Allweddair
-
IPSV Subjects List
-
- Risk management
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2020-11-18
Allweddair
-
NRW SMNR Keywords
-
- Natural Resources (Incl. Features and Processes) (SMNR)
- Freshwater and Wetlands (SMNR)
- Sustainable Management of Natural Resources (SMNR)
- Management Areas (SMNR)
- Hydrological Processes (SMNR)
- Ecosystem (SMNR)
- Physical Geography (Physiography) (SMNR)
- Flooding (SMNR)
- Soil and Land (SMNR)
- Sea and Coast (SMNR)
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2024-06-26
System Cyfeirio Gofodol
Cynnwys
Gwybodaeth Cynnwys
Proffil CNC
Elfennau CNC
- Teitlau cysylltiedig CNC
-
National Flood Hazard Maps 2019
Cyfyngiadau
Cyfyngiadau
Cyfyngiadau ar Fynediad a Defnydd Cyhoeddus
- Math o Gyfyngiad
- Other restrictions
Cyfarwyddeb Cyfyngiadau Mynediad
- Cyfyngiadau
- no limitations
Testun cyfyngiadau mynediad
- Cyfyngiadau eraill
-
There are no access restrictions on this data. NRW may release, publish or disseminate it freely.
Defnyddiwch gyfyngiadau
- Cyfyngiadau Defnyddio
- Other restrictions
- Cyfyngiadau eraill
-
© CNC/NRW and Centre for Ecology and Hydrology © NERC (CEH) Some features of this information are based on digital spatial data licensed from the Centre for Ecology and Hydrology © NERC (CEH). Defra, Met Office and DARD Rivers Agency © Crown copyright. © Cranfield University. © James Hutton Institute. Contains OS data © Crown copyright and database right 2015. Land and Property Services © Crown copyright and database right. Data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and copyright of the owners. It is the recipient's responsibility to ensure the data is fit for the intended purpose.
Metadata
Metadata
- Dynodydd Ffeil
- 4f4c4942-4343-5764-6473-313136323733 XML
- Laith Metadata
- English
- Math o adnodd
- Dataset
- Dyddiad Metadata
- 2025-02-04T10:44:13.148Z
- Enw Safonol Metadata
- NRW
- Fersiwn Metadata
-
1.0