Welcome to my new blog series. Normally I take notes all day long on my design process. For this project, that has now gone on for more than a year and 3 months of endless reviews, and complete redesign after redesign, I will make documenting this project a hobby. I am hopeful that this blog can serve as a tome, a warning, and dare I say, educational for other engineers in Jackson County. This is what I did today, these are my online notes about the comments from Chris Jenkins, Public Works Engineer at Jackson County
- Per Jenkins 3-15-19
- Add sister CI @ 31+00 (All inlets have to have a ‘sister’ inlet across the street, because, cupcakes)
- Add sister CI @ 41+50 (All inlets have to have a ‘sister’ inlet across the street, because, marshmellows)
- All box must be 6×4 (The county no longer allows for inlets over 6×4) —- wonder what one does if they need a pipe larger than 36″ going into the side of the inlet? or at an angle? or a pipe larger than 60″ in the back and front, or any of the other reasons to use a larger box.
- Use new CI detail
- Add inlets 8-1 (41+50) and 2-2 (31+00)
- changed all inlets to 10″ opening
- Change all inlets to 6×4 in hydroflow
- CI 1-3 spread is too high
- Changed 1-3 to 6×4
- Add inlets North and South 10′ seperation (line 2 and line 7)
- need to rename 7-1 everywhere and 2-1 everywhere
- erased angle deflection to aide drafting ( will have to create detail to show all the angles
- query road profile for instantaneous slope at 2-1 32+38.84 -0.41% and 7-1 32+70.84 +0.45%
- Establish new drainage after adding 2 additional inlets north and south of 1-3
- North1 inlet gets
0.78ac .04 ac - South1 inlet gets
0.33 ac.01 ac - middle inlet gets 0.51 ac
- Add inlets to storm sewer model
- CI 1-3 spread still equals 19 feet, spread is too high
- Add 2 additional inlets North and South
- North2 inlet gets .77ac
- South2 inlet gets .33ac
- query road profile for instantaneous slope at North2 and south2 32+22.83 -0.83% and 7-1 32+86.83 +0.88%
- re-input the drainage areas around so that the most uphill inlets intercept
- CI 1-3 Spread = 14 feet, spread is too high, depth of 0.34 feet
- We are allowed for extra spread within 50′ of a sump condition, so, calculating the difference between the low point and the elevation of points 50′ either way of the low point gives us a depth limit. For low point at 1-3 (sta 32+54.02) we have a depth limit of 0.33 feet.
- Added note on street profile indicating 50′ sump spread limit, this can be used to quickly calculate the available depth on my gutter at the low point.
- storm sewer model indicates we have 0.34 feet of depth at the supmp, so, I am within .01 feet now of a solution to this. The placement of the inlets based on the minimum seperation (waiting to hear from jenkins) will get me to the 0.33 requirement no problem.
- drainage Area 4 will need modified for adding CI 2-2
No additional progress can be made until I hear the minimum seperation on these inlets from chris jenkins. I have 5 inlets within 70 feet of each other. This is the stupidest thing I have ever drawn. In my life.
