Consents suspended on residential development in Whangārei over slip risk 17 Dec, 2020 05:00 PM 5 minutes to read Slumped land just off Manuka Pl prompted a geotech investigation on the adjacent Kotātā Heights subdivision that found some houses were at risk of land slip. Photo / John Stone Slumped land just off Manuka Pl prompted a geotech investigation on the adjacent Kotātā Heights subdivision that found some houses were at risk of land slip. Photo / John Stone Just-built homes in Whangarei s newest suburb are at risk from slips, fresh geotech evidence shows. Geotech engineers say more than a dozen houses on Stage 2 at Kotātā Heights in Morningside may become unstable if