HSPF

HSPF is like a special calculator that helps people figure out how dirty water might get if it went through different places, like a field or a factory, and then went into a river or stream. It can also help figure out how much water there might be in a river or stream at different times of the year. It's important to use HSPF because we want to make sure our rivers and streams are clean for plants and animals that live there, and so people can use the water too. Think of HSPF as a detective that helps solve the mystery of how water quality and quantity change as it travels through different places.