The Neckartal Dam is the largest dam in Namibia, with a full supply volume of 853 Mm³, exceeding the volume of the existing largest dam¬‒Hardap Dam, by a factor of three. Projects of this magnitude need innovative construction technology in order to be executed successfully, all the more Neckartal Dam, due to its desolate location in the arid climate of southern Namibia with irregular, high peak runoffs. During the design of Neckartal Dam, two physical models of the dam wall structure were performed. Physical models were constructed to scales of 1:60 and 1:120. The results from the physical models were used to improve the safety of the spillway and reduce potential scour erosion downstream. Throughout the construction of the dam, innovative techniques were implemented to ensure that high accuracy of the finished concrete works was achieved. These techniques included the construction of trial spillway crests and the three-dimensional surveying of the dam wall and spillway crest during construction with the use of unmanned aerial vehicles and photogrammetry.