the dwafDEPARTMENT OF WATER AFFAIRS AND FORESTRY

A hydrological information- & data-base

HYDSTRA: Background................ • Commercial off-the-shelf product

• Originally an Australian company,

• Now merged with Kisters, Germany

• Both specialising in Hydrology

• HYDSTRA used in 22 countries

• More than 150 installations

HYDSTRA: Distribution in SA…. • DWAF Head Office 3x

• DWAF regions 12x

• DWAF laptops 10x

• KOBWA

• Namibia

• Botswana??

HYDSTRA: Supporting............... • Data Acquisition from multi-sources

• Integrated data management

• Managing long time-series

• Graphic user interfacing & editing

• Analysis, modeling & simulation

• Archiving with quick access

• Data & information dissemination

HYDSTRA: Basic Components.... • Archive Structures

• Workbench

• Displays

• Calculations & Conversions

• Data Dissemination

• Advanced Functions

HYDSTRA: Archive Structures......

• Multiple Versions of Records

• Compressed Time Series

• Database Tables

HYDSTRA: Archive Structures......

• Multiple versions of records:– Infinite number of sites

– Up to 250 variables per site

– Up to 100 versions per variable

– Can store temporary versions in other directories, on server & PC.

HYDSTRA: Archive Structures......

• Compressed Time Series:– Water levels

– Reservoir components

– DWAF evaporation and rainfall

– Weather Bureau rainfall

– Dam balances

– Comments per data item

– Up to 100 quality flags per data item

HYDSTRA: Archive Structures......

• Database Tables:

– Site details

– Ratings

– Basin surveys

– Site History

– Statistics on records

HYDSTRA: Workbench......

• Used for data editing / archiving• Functions:

– Cut and Paste– Time adjustment– Free hand drawing– Reference trace– Zoom– Edit to control readings– etc

Graphical View in Workbench

HYDSTRA: Displays...... • Customising to:

– Specify period per page/s– Combined records– Type of plot– Statistical plots– Different periods on one plot– Destination of output

HYDSTRA: Displays………. •Box and Whiskers Plot:

HYDSTRA: Conversions………. • Variable / version

• Quality codes

• Rating tables / equations

• Powerful tools for data conversion– Convert to another variable

– In a string of steps

– Define once, re-use

HYDSTRA: Dissemination…… • Many flexible retrieval options

• Define groups of stations

• Graphical / text / electronic output

• Output can be customised

• DLL for external retrieval of data

• Data on W W W - refreshed daily

HYDSTRA: Dissemination…… • Can select station numbers from:

–group

–file

–directory

–database or defined table

–combination / filters (and, or / not)

HYDSTRA: Dissemination…… • HYCSV:

–useful facility

–extract data in CSV format

–multiple columns

–with variable conversion

–open in Excel

HYDSTRA: Dissemination W W W www.dwaf.gov.za/hydrology/cgi-bin/his/cgihis.exe/station

or

On DWAF website:– HYDROLOGY: Dams Flows and Floods –Access Data (new)

HYDSTRA: Dissemination W W W

HYDSTRA: Dissemination W W W

HYDSTRA: Dissemination W W W

Mapping Interface

HYDSTRA: Advanced………… • HYCRSUM:

–combine two time series

–add, subtract, multiply or divide

–time shift

–variable conversion

–create new time series

HYDSTRA: Advanced………… HYCRSUM - Input screen

HYDSTRA: Advanced………… HYCRSUM - plot of result

HYDSTRA: Advanced………… • MODSYN:

–powerful modeling language

–based on vector algebra

–uses time series as vectors

–specify time steps

–do variable conversions

MODSYN - example script

HYDSTRA: Conclusion

• Data readily available

• Easily accessible

• Multiple formats

• Multiple media

• Powerful data manipulation

• W W W Convenience

HYDSTRA: Conclusion……

• For more information, please try:

WWW.hydstra.com

Thank You