Many spillways have floodgates designed to control the flow through the spillway. The dam's two spillways are on the auxiliary dams rather than the main dam. The dam had two uncontrolled earthen spillways. Four spillways to dams flooded, causing damage, though none of them failed. Hydraulic jumps are commonly used as energy dissipators downstream of dam spillways. The engineers decided to raise the floodgates controlling the tunnel spillways. Two concrete-lined flip bucket spillways would abut both sides of the dam. The earth embankment is long with two submersible spillways, long and long. The spillways and outlet works (jet-flow gates) are rarely used. There are 52 spillways present in different Barangays. There are two main types of spillways&colon; controlled and uncontrolled. The steps on stepped spillways can be used for energy dissipation. Another problem is the invasion of the canal by weeds in the levels and spillways. All spillways afford a maximum discharge of . In addition, they are not always intended to dissipate energy like stepped spillways.