INTRODUCTION TO
PROPOSED DEMOSTRATIONBASIN, NEPAL

Presented By:
Shiv Kumar Sharma
DOI, Nepal

NEPAL’S PRIORITY ON WATER SECTOR••••

Most Important natural resources that can beutilized for Nepal’s development
Have a potential to irrigate all agriculture land
and generate 43,000 Mw of hydropower
If regulated can significantly contribute toenhance lean season flow in Ganges
Can contribute flood disaster mitigation andimproved navigation in a regional scale

NEPAL’S PRIORITY….
• Nepal has approved National Water Plan
• The Plan has– Identified 10 key areas for development.
– Set targets for 25 yrs to each of these areasstarting 2002
– Recognized Integrated Water Resources
Management as the key guiding principle fordevelopment.

National Water Plan

• Three areas of development– Security: Disaster Management, Environment
Protection– Uses: Drinking Water, Irrigation, Hydropower,
Tourism & Industries– Institutional Mechanism

Institutional Mechanism• Functional Enhanced water-related
information systems• Appropriate legal system• Regional cooperation for mutual benefits• Appropriate institutional mechanism forwater sector management

DEMONSTRATION BASIN• Demonstration Project is perfectly in linewith the Government’s policy and supports
achieving the targets.
• Initially we have considered taking twobasins for demo projects- Bagmati andNarayani• Considering available human, financial anddata resources and the socio-economic
benefits, only one basin- Bagmati isproposed for demo project.

BAGMATI BASIN• Area : 3,700 sq.km• Agriculture Area : 639 sq. km• Population : 2 Million• One of the middle sized rivers in Nepal• Originates from lower mountain and passes
through the two lower physiographic regions• Important from the view point of water
resources development, controlling pollution
and flood damage mitigation• Creates two of the most flood affecteddistricts of Nepal- Sarlahi & RautahatLocation Map : Bagmati BasinAVAILABLE DATA••••••••

Basin map- topographic, Transportation,
Administrative boundaries,Settlement
Stream Flow data (3)River Networks Map
Land use and Vegetable Characteristics
Soil Characteristics
Soil Temperature (2)Precipitation(25), Air Temp, Humidity (4), Wind(4), Pressure(4), Evaporation (2)Water Use Inventory

AVAILABLE DATA

Some works are already done in linewith AWCI objectives:•••

Integration of GIS data
Inventory of Water uses
Flood hazard maps for various return
periods
Land slide hazard maps
With support from JAXA’s Miniproject

•
•
–––

Rainfall runoff modeling
Direct flood damage assessment /loss
estimation
Prelimanary Flood forecasting and early
warning system based on Historical data

Methodology of Flood Forecasting
Satellite image

Rainfall data

(1. TRMM and 2. Rain gauge data)

1. DEM
2. Flood map
3. Landuse map

Hydrologicalmodel(1. HEC HMS and 2. Statistical)

Topographical
Data

Flood hydrographHydraulic model(HEC RAS)

Flood maps

Comparison &Improvement

Communitysurvey

Rating curve
Flood maps for
Diff. Return periods

Flood hazard
Direct flood
Flood maps formaps
damage assessment Diff. Water levels
Populationdata

Flood risk maps

Flood Early
War ning System

Need for Further Actions:• Establish a network of real-time datatransmission using CDMA commerciallyavailable;• Integrate this network to the central
processing system;• Develop tools to automate processing• Integrate Techniques of downscaling global
met info to the rainfall runoff model• Constantly validate the flood warning to theobserved data
• Extend this system Appropriate for IWRMP