Buyers pay a premium for a corner lot and rarely ask what it does to water. Here is what position actually changes, and what it does not.
Corner lots cost more. The reasons given are usually space, light, and two street frontages. Nobody mentions drainage, and drainage is the thing position actually affects.
Here is what changes with position, and what does not.
The mapped hazard layers describe the ground, and a corner lot and the lot beside it usually sit on the same ground. Flood susceptibility, elevation, slope, storm surge exposure, and distance to a mapped fault will typically be the same or near identical across one block.
So position is not a hazard rating question. Screen the coordinates and you will find the block's answer. Position is about how water behaves once it is there, which is the local drainage question covered in your street is the problem.
Corner lots receive water from two streets. Runoff from two directions converges near a corner. If the drainage inlet is on the corner, that is fine and by design. If it is not, the corner is a collecting point.
Corner lots often sit at a low point. Road crowns fall toward intersections in many layouts, which means the intersection is where water gathers before it enters the drain.
Interior lots depend on their neighbours. A mid-block lot is sheltered from street convergence but exposed to what the lots on either side do. Someone raising their ground by a metre sends their water sideways.
End units in a townhouse row take the runoff of the whole row. Shared roofs and shared drainage discharge somewhere, and it is often the end.
Lots at the bottom of a sloping street receive the entire street. This is the most underrated one. On any street with a gradient, the last few lots before the low point handle everything the street collects.
A corner lot buys you access, light, and resale appeal. It can also buy you two streets of runoff and an intersection low point. Neither of those makes it a bad purchase. They make it a purchase where the drainage inspection matters more than usual.
If the block's hazard screening comes back clean and the corner is well drained, the premium is buying what it says it is buying. If the block screens as flood exposed and the corner is the low point, you are paying extra for the worst position on the block.
Ask the seller or the association one question directly: when the intersection floods, how deep does it get and how long does it take to clear? People who live on a corner know the answer, because they watch it from the window.
If the answer is that it never floods, ask how long they have lived there. As with all local memory, the length of the record matters. The point is made at length in Ondoy, 2009.
A hazard screening reports mapped susceptibility, elevation, slope, and distances at a point. It has no visibility into street gradients, drain condition, or how neighbouring lots have been graded. Those are visible only on site, and anything structural belongs to a licensed engineer.
CheckHazard does not replace a professional geotechnical or engineering survey.