Eastern Samar sits on the open Pacific with no island in front of it. Here is what to screen at an exact address, from Guiuan to Borongan to the interior.
Eastern Samar has a geography that explains most of its hazard picture in one sentence: it faces the open Pacific with nothing in front of it.
Storms that form in the Pacific and track west often reach Eastern Samar before they reach anywhere else in the Philippines. Guiuan was the first landfall of Yolanda in 2013. That is not a historical footnote, it is the reason the coastal screening here deserves more attention than the flood screening for most addresses.
Storm surge is seawater pushed inland by a storm's wind and low pressure. It is not rain. It is not river flooding. It is mapped separately because it behaves differently, and a lot can be completely dry in the heaviest monsoon and still be exposed.
For a coastal address in Guiuan, Salcedo, Mercedes, Balangiga, Balangkayan, Borongan, Dolores, or any of the shoreline barangays, read these two together:
The post on storm surge advisory levels explains what the mapped levels mean and how far inland each one is modelled to reach.
Eastern Samar does not have a dry season in the way western Luzon does. The eastern seaboard receives rain through much of the year, and the wettest months are when much of the rest of the country is drying out.
That matters for two reasons. First, ground here is often already saturated when a storm arrives, so it takes less additional rain to cause flooding or a slope failure. Second, a dry-season viewing is not available to you the way it is elsewhere. Take the rain as an opportunity, not an obstacle; the list is in visit the lot in the rain.
Screen flood susceptibility and the distance to the nearest mapped waterway for any address, coastal or not.
Behind the coastal strip the land rises quickly. Interior barangays and the towns along the river valleys sit on or below sloping ground, and the combination of steep terrain and persistent rain is the classic landslide setting.
For any address with slope, read slope and mapped landslide susceptibility together, and check the debris flow and alluvial fan flags at valley mouths. Flat ground where a steep valley opens out is flat for a reason.
Roads along this coast are long, narrow, and exposed. A single damaged bridge or a slope failure can cut a town off. When you evaluate a property, evaluate the route to it: how many crossings, how many cut slopes, and whether there is a second way in.
Ask people who drive it daily which section fails first. They will answer immediately and precisely. The wider version of this check is in the house is fine, the road is not.
A large share of the housing stock along this coast was rebuilt or repaired after 2013. Some of it was done to a good standard with engineering input. Some of it was done fast, with whatever was available, by people who needed a roof that month.
Both look similar once painted. Ask directly: was this structure damaged in 2013, what exactly was rebuilt, who did it, and are there plans or permits. Then have a licensed structural engineer look at it. On this coast that visit is the best money in the whole transaction.
A hazard screening reads public national datasets at a point and reports mapped susceptibility, elevation, slope, and distances. It does not assess a rebuilt structure, the condition of a seawall, or the soil at depth. On an exposed Pacific coast those are the decisive questions and they belong to licensed professionals. The screening tells you which properties are worth paying them for.
CheckHazard does not replace a professional geotechnical or engineering survey.