Harris County will need a completed residential application and an accurate and detailed site plan. Table 1 from the HIRL's TechNote outlines the elevation requirements for each FEMA Flood Zone for the city of Houston and Harris County.Interactive Mapping Tools keep the residents of Harris County and the City of Houston informed, help Flood Control District employees do their jobs. The Canyon is an elegant and spacious home. A large kitchen with a curved island and eating bar overlooks the adjacent family room and dining room. Example: Fire Code As-Built Certificate, Harris County Foundation Certificate or Elevation Certificate.