The main part of a Delft-FEWS configuration is defined in sets of XML files. In this section the different parts of the configuration are introduced. An understanding of these different parts of the configuration is required before attempting configuration of a Delft-FEWS system.

Stand alone client with configuration on local filesystem

Typically, a new Delft-FEWS configuration is first setup in a Stand alone application, using a configuration setup on the local file system. In this case, the configuration is defined by a fixed set of directories, each containing different parts of the configuration. These directories are all contained under the Config directory.

Operator client configuration in local datastore and central database

When distributing the application, the configuration files are instead shared via a local datastore or the central database. The local datastore or the central database, stores the same local filesystem configuration directory structure in dedicated SQL tables, each table containing different configuration directory. The configuration in the central database belongs to a dedicated Delft-FEWS implementation of a particular forecasting system. In the live system situation the contents of the database will be shared between all operator clients and forecasting shell servers in the system, and is therefore expected to be identical in all parts of the system. In the central database active versions of configuration items have synchLevel 11 whereas inactive configuration files have synchLevel 0. The ConfigRevisionSets table defines the active configuration.

When initiating the Delft-FEWS application, it will look for configuration stored in the local datastore or in the filesystem. If both are found, then the system might ask the user to choose which to use. If neither is found then an appropriate error message is issued and the system will stop.

RootConfig files

A small set of XML files referred to as the root configuration files. This root configuration is required to identify for example if the particular instance of Delft-FEWS is operating in stand-alone mode or as an operator client, or on windows or linux. Some configuration files may differ between operator client and/or forecasting shell server. These  files have a filename with a meaningful prefix such as 'oc_windows_' or 'fss_linux_'.

Elements of the configuration

The two tables below provide an overview of the configuration elements of Delft-FEWS. Table 1 Overview of different configuration items contained either in the config directory or in the database:

Configuration Item

Directory on filesystem

Table name in database


Transformation coefficient sets for specifying ranges or conditions in locations in specific time periods.CoefficientSetsFilesCoefficientSets

Cold states for modules. Zip file containing model specific data exported by GA usually before running a model.




CorrelationEvents describing discharges, levels or other obtained observations for historical floods.CorrelationEventSetsFilesCorrelationEventSets

Definition of layout of user displays, including What-if scenarios, Grid Display, etc.




07 Display Configuration

Flag conversions between external sources (e.g. telemetry, modules) and flags used in Delft-FEWS internally.




08 Mapping Id's flags and units

Icons used in main map display and button bar




Mapping definition of ID's between external sources (e.g. telemetry, modules) and ID's used in Delft-FEWS internally.




Map layers (shape files) used in main map display and spatial interpolation




Module configuration for handling data and running forecasting models




Zipped files containing datasets for modules used by the forecasting system.




09 Module datasets and Module Parameters

Definition of module parameters stored in Delft-FEWS




09 Module datasets and Module Parameters
Files for the PiClient.PiClientConfigFilesPiClientConfigurationsMultiple
Triggers export/import for modules.PiServiceConfigFilesPiServiceConfigurationsMultiple

Regional configuration, including all locations, location sets, parameters, several types of descriptors, etc..




04 Regional Configuration

Images used in reports.




09 Report Module

HTML, css, js template files used in creating HTML reports for use on the web server.




09 Report Module
Operating system configuration, clientConfiguration, global properties and patch.jar for supporting automated updates.RootConfigFilesRootConfigFilesMultiple01 Root Configuration Files

System configuration items, including the plug-ins available to the system, definition, icons etc.




03 System Configuration
CorrelationEvent travel times describing  travel time for events from location to location.TravelTimesFilesCorrelationTravelTimes

Unit conversions between external sources (e.g. telemetry, modules) and units used in Delft-FEWS internally.




08 Mapping Id's flags and units

Workflow configuration for running sequences of modules.




06 Workflow Configuration

Naming conventions for defining module config files

For complex forecasting systems the number of configuration files can be very large. This is particularly the case for the module config files, and because the names of these are used in TimeSeriesSets for storing and retrieving data, the names given should be chosen logically. Before configuring large numbers of XML files it is wise to:

  1. define a naming convention and use this throughout.  An example of such a convention is where a number of steps are used to process data prior to running a model. For instance, a forecast model run for the HBV model in the Rhine may be defined in a module called HBV_Rhine_Forecast.xml. Data processing steps such as an interpolation module may then be called HBV_Rhine_ForecastInterpolate.xml and a data merge module HBV_Rhine_ForecastMergeInputs.xml. This clearly indicates the association between modules and brings structure to the configuration.

  2. when multiple almost identifcal configuration files would be required, it is recommended wherever possible to use template configuration files. These template configuration files contain $ tagged variables that can be filled in as as properties when referred to by other XML files.

XML Schemas and schema validation

Each configuration item contained in an XML file must be formatted as specified in an appropriate XML schema (XSD file). Validating against the schemas is an important step in configuring Delft-FEWS, as the XML validation makes sure the syntax of the configuration made is correct. There are two types of configuration in Delft-FEWS. In the first set, for each different schema type, only one default configuration file may be used and the name of the configuration file is unique. For the second set of configuration, multiple configuration types may be available for a specific schema. The names of these may be defined by the user. An XML file contained in the regional configuration element is then used to register these XML files with a user specified name to the system, and identify the type of configuration. This file is referred to as a descriptor file. Table1 identifies for which type of configuration a single files per type is allowed and for which multiple instances for each type of configuration may exist.

Configuration versioning file naming conventions  (now obsolete)

NB. The "default" versioning name convention described here is not required / recommend anymore for new configurations. In general it is good practice to manage config versioning using SVN tooling, see

For each of the configurations managed by Delft-FEWS in either the database or on the file system as described above, various versions of configuration may exist. Configurations that are active and used as a default can be identified both in the file system and in the database. On the file system an optional  naming convention is introduced to identify which of the possible multiple versions are used as a default. The naming convention for the default version:

<Name of XML configuration file>SPACE<Version number>SPACE<default>.xml

Another version of configuration will have a different version number. The <default> item is omitted. Examples:

Explorer 1.00 default.xmlA "default" version of the configuration settings for the FEWS Explorer
Explorer 2.00.xmlA second version that is not made active, since it has not the "default" tag.
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