Seite - 1317 - in Book of Full Papers - Symposium Hydro Engineering

3. LARGE INSPECTION DAM 3.1. KEULILING DAM INSPECTION The regular and large inspection is part of the dam safety evaluation and monitoring process, which purposed to comprehend the condition of a dam related to the security of its structure, hydraulics and operations, identifying the existing problems and establishing suggestions for improving dam security. Large inspection, ie thorough inspection of technical and non-technical aspects supposed to evaluate the dam safety and emergency preparedness. This inspection was led by an expert team who is experienced in the field of dams and at least assisted by Geologists and Hydromechanists.The main work of the large dam inspection executed in five of scope works; a. Inventoring and reviewing the existing data b. Field inspection work c. Instrumentation and interpretation monitoring program d. Analysis of inspection result e. Report compiling Three main surveillance conducted in the large inspection of Keuliling Dam were visual inspection, underwater inpsection and major inspection. Visual inspection was for ground and water investigating objects, such as dam surfaces, auxiliary buildings, ridges and reservoir cliffs, hydro-mechanical equipment including dam and supplementary buildings. The investigation was for cracks, sub-drainage, crushing, dissolving, leaking, indication of deterioration of quality or chemical reaction, and damage caused by erosion and cavitations. Also, it is aimed to check the contraction joints for water resistance, as well as large signs of expansion or contraction, and the difference in motion of adjacent concrete blocks, the connection of the construction of either vertical or horizontal joints. Elevation of dam crest, cantilever, supporting wall, column, or other wall examined by using previous results as a benchmark to determine the movement of construction. The aeration holes and other openings on the overflow launcher or on the door must be free from mud and other deposits. This action was directed to problems related to scouring and abrasion. Further, the construction alsoinvestigated for: cracks, leaks, basins, springs, evaporating holes, incidence of reed erosion, scouring, abrasion, excessive cultivation of plants, crest straigthness, bumps and slopes, animal holes, deterioration of riprap quality as well as other slope protective materials and so forth. Underwater inspection is an investigation of objects under water that executed by beaming or diving method. The objects explored in the upper slope surface of the dam in order to determine the possibility of embankment, avalanches, deterioration of slope protective quality and so on. Upper face of a dam inspected to determine the possibility of cracks, material degradation or openings resulting in increased seepage and leakage. 1317