I've got a similar spot, flow looks pretty close. I put in a 36 inch with 2 feet of top fill and 6 inches of crushed stone on top. Did great until a 20 year rainfall event sent the whole mess a quarter mile down stream. Now I've got the 36 with a 24 beside it, aligned top to top so the 24 only kicks in at high flow. The whole thing is capped with a 10 foot wide 22 foot long 8 inch concrete slab. Slab is 3500 psi, fiber reinforces with 4 inch pipe 6 inches apart with welded bracing to hold it in place for rebar. At each corner I dug 36 by 36 inch bell holes and let the concrete fill them too as anchors. Bridge has a v in the center and slopes toward down stream to allow for overflows. Water has been over it 3 times in 10 years.
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Today's Featured Article - Measuring with Calipers - by Staff. The legs of inside calipers are curved outward at the extremities to facilitate measuring small holes, while outside caliper legs have a large curve inward to increase their capacity for large work. Firm-joint calipers are adjusted approximately by the hands and then set to the feel of the work by tapping them on a metal surface. It is a common practice when opening calipers by this means to tap the top of the joint. It is better, if possible, to tap the inside of the legs, as repeated blo
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