Nepal Hazard Risk Assessment - Asia-Pacific Gateway for Disaster ...

Nepal Hazard Risk Assessment
3.4.7 RECOMMENDATIONS
• The profile of flood hazard maps for Babai, Bagmati, Rapti, Kamala, Kankai, Tinau and Narayani
rivers are presented in Figure 3.27 to Figure 3.33 respectively.
• The flood hazard maps have been developed at national level scale using secondary data. The data
used for the modeling is primarily from DMH, DWIDP and DOS. The current flood hazard maps
show a broader picture of area under flood inundation. However, it is imperative to carry out site
specific flood hazard mapping for local level planning.
• The hydrological and hydro-meteorological data for flood hazard assessment are scarce and requires
efforts from departments to collect and compile for precise flood hazard mapping.
• The current flood hazard maps have been developed for most important river basins that are
frequently flooded and affected life and properties. Though there are many rivers, which do not
expose life and properties much, it was felt that carrying out flood hazard maps for such basins are
also important.
Figure 3.25.Percentage of flood hazard area with respect to district area at 100 years return period
• Since Nepal is frequently affected by floods, it is necessary to develop detailed flood inundation
maps for the country. The inundation maps will help policy makers and decision makers to
understand the severity of floods. They will also help in damage and loss assessment, and relief
operations. The actual inundation maps will help the scientific community to validate the flood
hazard maps. UNOSAT supports the activities involved in the development of hazard and inundation
maps. The UNOSAT is the UN Institute for Training and Research (UNITAR) Operational Satellite
Applications Programme, implemented in co-operation with the European Organization for Nuclear
Research (CERN).
• DWIDP and DMH along with other agencies like ICIMOD have carried out several pilot based flood
hazard mapping for important rivers. An approach is required to integrate these maps at suitable
scale and used for disaster resilient development.
• The floods hazard map show that most developed districts like Lalitpur, Kathmandu, Bhaktapur and
other districts contributing to economy are coming under flood inundation. There is a dire need to
introduce disaster preparedness and mitigation policies for reducing the flood risk in most developed
but flood affected areas.
Figure 3.26.Percentage of flood hazard area with respect to district area at 500 years return period
59