gjeppesen
Civil/Environmental
- Jun 12, 2003
- 47
I'm designing a 90 acre industrial park with a maximum impervious for each lot at 83.3%, obviously very high. The project will discharge to one large wet pond and outfall to an adjacent off-site ditch.
The roads will be private rural section with 2.25 deep swales to accomodate both road runoff and lot runoff. These shallow swales will then discharge into ditch bottom inlets, into the storm sewer system and into pond.
Now, the question. In Florida we typically design the storm sewer/roadside swales for local roads to the 10 year storm. I'm used to designing curb inlets such that the grates need to be at or above the HGL to elimate spread. But with these inlets being 2.25' below the edge of pavement, this doesn't apply.
How should I determine the minimum bottom elevation of the roadside swale, and as a result, the road elevation?
FYI the 25 yr, 24 hr storm stage is 35.22 and the 10 yr, 24 hr storm stage is 34.90.
The roads will be private rural section with 2.25 deep swales to accomodate both road runoff and lot runoff. These shallow swales will then discharge into ditch bottom inlets, into the storm sewer system and into pond.
Now, the question. In Florida we typically design the storm sewer/roadside swales for local roads to the 10 year storm. I'm used to designing curb inlets such that the grates need to be at or above the HGL to elimate spread. But with these inlets being 2.25' below the edge of pavement, this doesn't apply.
How should I determine the minimum bottom elevation of the roadside swale, and as a result, the road elevation?
FYI the 25 yr, 24 hr storm stage is 35.22 and the 10 yr, 24 hr storm stage is 34.90.