Money by Watershed
The bonds will raise $2.5 billion to be repaid by Harris County property tax. Many projects are in partnership with federal agencies, which will cover around 75% of a given project's cost. With bond and federal money together, the total money for projects is $5,512,455,000. Here that money is broken down by watershed. Not shown is $921 million for "countywide" projects.
Money per Harvey-Damaged Structure by Watershed
According to HCFCD, 154,180 structures were damaged by Harvey. If flooding were strictly a local issue, I would expect the money per damaged structure to be roughly equal for all watersheds. But flooding is a regional issue: every watershed drains into one neighboring watershed. All water flows towards Galveston Bay.
An excess of funding is going to watersheds at the edges of Harris County, particularly in the Northwest. I think this makes sense: deal with water flowing from neighboring counties by building infrastructure in the least-developed parts of Harris County. Though we may be a little over-invested in Cypress and Spring.