The department is authorized and directed to work with public and private institutions and agencies or persons to insure that special services will be available in all regions of the state, both rural and metropolitan. Whenever services or special services required for the purposes of sections 189.010 to 189.085 are not available, the department is authorized to use up to ten percent of the funds appropriated for the purposes of sections 189.010 to 189.085 to assist in establishing the facilities and professional staff required. For the purposes of implementing this section, the department and the advisory committees shall give special consideration to those areas of the state or population groups which demonstrate the highest incidence of developmental disability or where accessibility to services or special services may be limited because of distance.