From FEMA regulations: "Riverine levees must provide a minimum freeboard of three feet above the water-surface level of the base flood. An additional one foot above the minimum is required within 100 feet in either side of structures (such as bridges) riverward of the levee or wherever the flow...
We have an old (35+ yr) system that spins a cone gear at very slow speeds: input rotation needs to be as slow as about 2.5e-4 rpm, i.e. 4000 minutes per rev. The old system we had involved an AC synchronous motor running at 15 rpm, a 4:1 reducer, a multigear reducer (ranging from 2:1 to 1000:1...
I have a culvert that drains under a roadway embankment. The culvert inlet (15-foot section of 16-inch RCCP) has settled about 6 inches at the inlet and is now sloped in the opposite direction (away from the embankment, so water pools around the inlet). The downstream side has not settled...
Does anyone have a rough idea of the increases in cost of installing sheet piles from a barge as opposed to from land? Installing about 20,000 sqft of wall, and it is possible to install either from land or water. We're exploring whether avoiding impacts to the landside is worth the money.
