Hydraulic jumps are used as energy dampers that cover part or all of the pool called the olak pool. The study of this can be done through a study of the flow in small open channels that pass through the shedding with a model of vlughter type of abundant building. The purpose of this study is to find out the different influences of upstream and downstream height on the length of the water jumping pool in vlughter type buildings with variations in discharge and to find out the effect of changes in the height of the olak pond on the length of the water jumping pool in vlughter type buildings with a fixed discharge. The different influence of height in the temperature and downstream on the length of the spring jumping pool is influenced by the varying height of the lighthouse. The results of the study for the length of the water jumping pool at the lighthouse 0.08 m discharge 0.0015 m3 / etc. obtained 1.19 m while for theoretical at a discharge of 0.0015 m3 / stk lighthouse 0.08 m obtained 0.2203 m shows the difference between research in the laboratory with the calculation in theory this is due to the absence of endsill in the olak pool in the laboratory then the length of the water loncar pool that occurs very far.

Keywords : High of Lighthouse, Pool of Olak Vlughter, Water Jumping Pool.