Flood damage repair to Mambedi?Lower Dam Spillway

摘要

Mambedi Lower Dam, located 40 km east of Makhado (Louis Trichardt) in Limpopo, is a key water source for use in the production of macadamia nuts. The dam suffered large-scale damage during an extreme rainfall event in February 2000 when water discharge nearly reached the regional maximum flood (RMF) peak. This event damaged the existing concrete overflow structure and spillway channel on the right bank, leaving in its wake a donga nearly 80 m wide and 15 m deep, through which water flowed freely, drastically reducing the dam’s overall capacity. EPESA (the Client) appointed PG Consulting Engineers as the main consultant for the repair of the dam’s spillway, based on a design for discharge just higher than the RMF.