PERENCANAAN DRAINASE BAWAH PERMUKAAN (SUBSURFACE DRAINAGE) STADION REJOAGUNG TULUNGAGUNG

Rejoagung Stadium Tulungagung is one of the fields located in Tulungagung City. Comfort when using the football field is important. One of them is that there is no puddle when it rains. The Puddles will cause players discomfort when competing and blocked the ball's pace. The purpose of this planning is to determine how much discharge flows in the field and the discharge that will be absorbed by the subsurface drainage so it can be known that the infiltration time needed to make the soil dry again. In this final project planning used some analysis, among others, analysis of hydrology, soil and hydraulics. In the hydraulic analysis it is used to get the discharge in the plan channel, soil analysis is used to determine the layers of soil composing the field as well as the infiltration and permeability of the soil layer, while in the hydraulic analysis it is used to determine the capacity and dimensions of the planned drainage channel. Based on the results of the analysis carried out, the planned rainfall in R10 = 116,384 mm. Soil porosity = 0.31, permeability = 134.9114 mm / hour and infiltration rate 100mm / hour. The time needed for dry soil as before is 125,66 minutes, pipe diameter is 100 mm with a distance of 3.5 m, the cross-sectional dimension of the surface channel is 30 cm x 30 cm with concentration time = 0,7 hours, rain intensity = 51.179 mm / hour .