These include avalanches, mudflows, debris flows, earth flow, lahars and sturzstroms. Large mudflows called lahars were also common during that period. Repeated eruptions built lava domes and produced lava flows, ash plumes, and mudflows. Pyroclastic flows and mudflows were deposited on the lower slopes of the cone simultaneously. Lahars (from a Javanese term for volcanic mudflows) are mixtures of volcanic debris and water. It unleashed floodwaters and mudflows from Mount Pinatubo into the town. Sturzstroms have similarities to the flow of glaciers, mudflows, and lava flows. Earthflows occur on heavily saturated slopes like mudflows or a debris flow. The extreme amount of rain triggered enormous mudflows and severe flooding throughout southern Taiwan. This design allows the bridge to remain intact even during heavy mudflows and floods. If the ash mixes with rainfall then it could become dangerous mudflows. A majority of the mudflows coursed to Cook Inlet, about from the volcano. Lahars (mudflows) have reached the Colca River valley. A total of of material was transported south into the Columbia River by the mudflows. They have however produced significant historic mudflows.