Basin Information Management

The Information Management Directorate administer the information related to the Knowledge function for the Rift valley Lakes Basin Authority. Also, Defining and identifying the information needed required to develop IWRM in the Basin. Information Management Directorate coordinate the activities of the two divisions of the team: Hydrometry Division and Basin Information team. The Major Activities performed by basin information management Directorate are collect, compile, analyse and disseminate information for proper planning, administration and direction-finding of water resources in the basin. Hydro-meteorological and bio physical data collection and supply to the users is the primary task of the directorate and still now water level, discharge in river, water level in lakes are observed parameters in were collected analysed, and compiled. Directorate also Ensure that the basin information system regular within the Authority and within Regional State and Federal organisations and for major stakeholders use of information for planning, studies and for making decision.

The Information Management Directorate has comprised two divisions, Basin Information System (BIS) and Hydrometric Information System (HIS)

 Hydrology is the study of the movement, distribution, and quality of water on Earth and other planets, including the hydrologic cycle, water resources and environmental watershed sustainability. The hydrologic cycle, is a continuous process by which water is purified by evaporation and transported from the earth’s surface and oceans to the atmosphere and back to the land and ocean’s Surface and ground water resources of a country estimates about 122 and 36BM3 respectively. In order to monitor and manage the resources the hydrology and Water Quality Directorate is organized under the ministry of water and Energy.

Use of Hydrological data and Information

Determining the water balance of a region and the agricultural water balance

Mitigating and predicting flood, landslide and drought risk

Real-time flood forecasting and flood warning

Designing irrigation schemes and managing agricultural productivity

Part of the hazard module in catastrophe modelling

Designing dams for water supply or hydroelectric power generation,

Designing bridges, sewers and urban drainage system

Predicting geo-morphological changes, such as erosion or sedimentation

Assessing the impacts of natural and anthropogenic environmental change on water resources

Assessing contaminant transport risk and establishing environmental policy guidelines

Hydrological Data Collection

Currently the Directorate is collecting surface water data from 47 stations in the Basin. Data collection mechanism varies from manual to automatic. The data collected with the required instruments are presented as follows:

Water Level  Measuring Device

Staff gauge

Automatic Water  level recorder

Chart plotter

Surf float with data logger

Pressure sensor

Rader sensor with Telemetric system

Discharge Measuring Device

Conventional Current meter with accessories such as wading rod, Bank Operating cable way (BOC), Crane, overhead cable etc..

ADCP ( Acoustic  Depth Current profile)

Cross-sectional Profile

Levelling instrument

Echo-sounder

Standard Sediment Sampler

Water Quality Kits and Samplers

Dip meter  and Data Loggers, GPS

Bathymetric Instruments such as echo-sounder, GPS, Boat and its accessories

The main data collected by the Directorate are:

Water Level data

Water level data is collected both from streams/ rivers, lakes and reservoirs using automatic and manual data collection techniques. The Automatic data is collected in an interval varying from 15 minutes to one hour intervals where as manual data is collected  twice per day, that is, in 12 hours interval.  The main objective of collecting is to know or determine the flow in the streams/rivers and outflow from reservoirs and lakes. Water level data is measured in all existing stations in the country.

Discharge measurement   

Discharge or flow measurement is conducted for different water resources development activities.

Sediment sampling

Currently Suspended sediment sampling is collected from Rivers. The main objective of measuring sediment is to determine the sediment flow through the river to estimate sediment inflow into reservoir, for the purpose of designing dead storage and fixing the bottom outlet of hydraulic structures.

Cross sectional profile

The cross sectional profile is taken at river gauging station to revise rating curve and to know the stability of the section.  Moreover, it also uses to study the scouring and silt deposition in the river system.

Bathymetric Survey

 Bathymetric survey is conducted on lakes and reservoirs to evaluate the change in Volume. It also uses to estimate the volume of silt deposited.

Ground water data

 Currently the Directorate collects and stores secondary data.  Ground water data is collected from wells (shallow wells and bore holes) and springs, the collected data is stored in the ENGDA database.  The data collected from these sources are site information, borehole details, water levels and water quality, the borehole details include: construction, drilling, borehole description, water struck, casing, and packing, well development, lithology, pump test, yield, water levels, pump and networks.

Water quality information stored in the data base includes: information about the sample collection history as well as analytical results. Results can be stored for physical, organic, inorganic, isotopic, biologic, and minor elements analysis as well as others water quality characteristics such as toxicity

A key element of the BIS is an upgraded Hydrological Information System (HIS) that monitors

surface and ground water,

meteorology,

Water quality and environment.

 The BIS integrates

Spatial Data System (SDS),

Information Management System (IMS),

Knowledge Management System (KMS),

Data Dissemination System (DDS).

Types of data in basin information

Biophysical characteristics

soils

topography

water yield

wetlands;

Climate and hydrology

the water that run on the surface or stored in the form of lakes

Hydro meteorological network monitoring;

land use/ land cover;

anticipated changes in land use;

best management practices;

water quantity and quality data;

ecosystems;

point and non-point sources of pollution;

demography;

population;

social and economic indicators