Institute for Environment and Sustainability 1

Sea outlet coding

Knowing to where the water flows to with 4 digits.

…a Structured basis to code hydrological features

Institute for Environment and Sustainability 2

Sea outlet coding

Purpose of coding

Level of detail

Hydrographic systems

Watershed coding inspired on Pfafstetter

CCM2 implementation

Transfer rules for non CCM2 features

Examples

Institute for Environment and Sustainability 3

Purpose of codingThe purpose of hydrological coding is to understand through the codingthe relations between rainfall and surface runoff in a landscape dominated by a surplus rainfall

To exchange geographic features an unique and shared identifier is needed for every feature

A coding system, in order to be successful must be short and comprehensive, anybody must be able to determinethe code for his part of the world

Institute for Environment and Sustainability 4

Hydrological systems definition

Institute for Environment and Sustainability 5

Seas

SYSTEM SEA NAMEA 1 Northern Atlantic OceanA 2 Norwegian SeaA 4 Celtic Sea and ChannelsA 5 North SeaA 6 Baltic SeaA 7 Western Mediterranean SeaA 8 Eastern Mediterranean SeaA 9 Black SeaN 7 Barentz Sea EastN 8 Barentz Sea WestN 9 White SeaC 1 Caspian SeaS 1 Southern Atlantic OceanT 9 Trasimeno LakeQ 9 Prespa LakeZ 9 Tuz Salt LakeV 9 Van LakeH 9 Orumiyeh Salt Lake

Institute for Environment and Sustainability 6

Commencement

Institute for Environment and Sustainability 7

Level of Detail

Primary catchments of ±10 km2

Institute for Environment and Sustainability 8

Transfer to WFD

Institute for Environment and Sustainability 9Ordering and aggregation

Institute for Environment and Sustainability 10

Ordering the Seaoutlets

Institute for Environment and Sustainability 11

Sea Aggregation

Institute for Environment and Sustainability 12

Island coding

• Procedure proposal– Find closest continental coastline

– Determine length along coastline to this point

– Order along the coast line• Example

– Ibiza

– Mallorca

– Menorca

– Corsica

– Sardinia

– Implementation for example a hexadecimal nr AA FF etc.

Institute for Environment and Sustainability 13

Island coding example

Institute for Environment and Sustainability 14

http://wise2.jrc.it

Full code:

Hydrological System Letter {A..Z}Sea Nr {1..9}

Island sequence {A0..F9}Commencement Code {1..99999}

Riversegment Pfaffstetter code {1..9999999999}

Rhine outlet: A500000081Rhine source: A500000089

Long river on Ibiza: A701000029Longest Riversegment code is 1985982445 in Dnepr