A systematic ordering of the maps and plane has been led in the library of the Research Center in Natural Sciences of Lwiro. The methods used are the following: observation method and interpretation that consisted to the numbering of maps by domain and identification with numbering of the maps without scale and cards with scale. A total of 1.530 maps were classified: regional maps: 1 101 maps with 192 maps without scale; 159 geophysical maps in which 35 without scale; 64 geological maps in which 5 without scale; 32 maps of medical entomology in which 6 without scale and 175 maps without title (theme) and without scale; either a total of 413 maps without scale against 1.116 maps with scale that means having a domain and a scale (complete maps).

In any case of the natural risks or human risks, populations, ecosystems, flora and fauna are exposed to threats. The objective is to study the impact of intervening disasters in Bukavu city from 17 to January 26 2014. We preceded the interview of people met instead of the disaster victim. We have visit the damaged sites also (districts), through a transect walk as definite by Dery and al., (1999). The identification of the different disasters was done by free observation.
The disasters occurred in Bukavu are varied (crumbling, landslide, tornado). The consequences on the buildings are considerable (wall collapsed to Camp Zaire, house slipped to Muhungu, house swallowed in the mud at College Alfajiri basin. The reasons of the disasters are the anarchical constructions in Bukavu city. The human damages recorder from 19 to 28 January 2014 is 21 deaths.
For one housemaids management and prevention of the natural disasters in Bukavu city, the provincial government should push and improve the legal setting of assignment of the permits to build and fundamental titles taking into account the seismic norm.

The attenuation of the natural disasters supposes the reduction of the vulnerability concerning human lives, goods and activities. The objective is to inform the public on the nature, the consequences of the disasters on the man, the natural habitat and agricultural of the basin of the Lake Kivu of 2011 - 2013. It is beforehand about identifying the factors of vulnerability, of measures the range of it and to localize in the space the most sensitive sectors. The level of appreciation of the factors will make itself by free observation by one visit of the Neuman sites, (2011). Through a transverse walk (transect walk) for the identification of the different environmental problems, Dery and al., (1999). This method is going to permit to know the major environmental problems in the zones of intervention.

The analysis of the landscape can serve to value human actions on soil in the Lwiro region. The approach of the indicators bound to the management of soil in the region is not well stocked enough. These criteria had been verified by the direct observation of the intervention sites in relation with geology by simple and open questions to people of the village met for enlightenments on the state of soil by a transverse walk. The species indicator of infertile soil represents a negligible percentage (Imperate cylindrica 0,5% Guizotia scabra 0,6% Tagetes minuta 0,8% Rhychelytrum repent 1%) except Conyza sumantrensis 5%, Crassocephalum vitellinum 3%. broadly speaking the indicators bound to the management of soil in the region of Lwiro are represented better in Byalumba that in Muganzo and Tshibati. the agriculturists provide an effort to palliate to the difficulties bound to the management of the fields. The depth of soil is big in Byalumba 54cm follow-up of Muganzo 40cm and Tshibati, 38cm.