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You probably need to model this as one bridge, 100 feet long, since you only have 30 feet between bridges. If the distance between the bridges was greater, you would want to model the partial expansion/contraction of flow between the two bridges. You also need to use the ineffective area...

If you have access to Haestad's PondPack program for stormwater management, the program will perform the calculations for you for one or more underground pipes on a slope. The only drawback is all the pipes have to be identical size and slope.

I don't know of a reference for plastic pipe "n" values, but the lower limit for n is 0.009 (glass tubing). When I worked with the Corps of Engineers, we replaced CMP culverts with 72" PVC pipe and used an n of 0.011. For a mitred entrance with no headwall, the entrance loss...

You can develop the i-d-f curves for the Richmond area from Bulletin 71, which gives depth-frequency and duration data for a nine state region including Kentucky. The publication is Rainfall Frequency Atlas of the Midwest by Huff and Angel, a combined publication of the Illinois State Water...