Question NW35 to the Minister of Human Settlements

Reply:

a) The South African National Standards (SANS) 1936-1: Development of Dolomite Land, which was developed by South African Bureau of Standards (SABS) sets out requirements for the development of dolomitic land. The SANS 1936-1thus ensures that people live and work in an environment that is understood by society to be acceptably safe, where loss of assets is within tolerable limits, and where cost-effective and sustainable land usage is achieved. The said standards are applicable to all the three spheres of government to avoid hazards associated with dolomite, especially in areas where the building of residential properties should be prohibited to eliminate the loss of life. In areas where the building of residential units is permitted, mitigation measures are put in place in the form of land use permitted in the Municipal Zoning Scheme. With this consideration, the Department provides guidance through the National Housing Code of 2009, which is based on the classification identified in SANS 1936-1: Development of Dolomite Land. Additionally, site rehabilitation measures have been introduced to ensure that houses are built on stable ground and the appropriate foundation is put in place. Moreover, the National Housing Code of 2009 entails maps of various provinces which designate dolomitic areas, to ensure that careful consideration is given during development, and that appropriate studies are conducted before actual construction can occur, to ensure safe environments.

b) To ensure the safety and well-being of citizens located in the dolomitic areas, a stringent process is followed. Part of this process is that prior to any housing project development, a feasibility study has to be undertaken to ascertain that the land can be developed. Once the feasibility study has been undertaken, a Geotech study is conducted to gather the physical characteristics of the soil and rocks on a site to ensure that if dolomitic rock is found, the site is rehabilitated where necessary, and proper foundations are designed. For projects that are developed in the dolomitic areas, conventional foundations such as strip or spot footings are often used in the building of houses where the risk of sinkhole forming is found to be adequate. Moreover, compacted soil mattresses that serve as a flexible reinforcement are used to strengthen structures on areas underlain by dolomite. In areas where sinkhole formation poses an immediate danger to the inhabitants of houses, the relevant municipalities (in consultation with the provincial departments of human settlements and all relevant stakeholders) are to consider the upgrading of aging or affected infrastructure or the identification and preparation of well-located and suitable land for the resettlement of affected households. The National Department of Human Settlements monitors compliance with technical specifications through analysis of business plans of Provinces and Metros, wherein the geotechnical reports should form part of the supporting evidence prior to development in dolomitic areas.