How did you estimate the amount of material (sand, sewage, silt, etc.) that was deposited in Mill Creek, how far it traveled, and where it was deposited in the Creek?
Bayland performed a sediment mass balance calculation, which estimated the amount of material that was washed from the sinkhole and predicted where this material may have been deposited. The amount of material that was washed into the pump station wet well was estimated based on the size of the wet well. The amount of material that was deposited in the floodplain area in front of the bypass outfall was estimated from actual field measurements. Estimates on the amounts deposited in the other areas were based on visual observations of the stream and adjoining floodplain and use of best engineering judgment. It was assumed that the gravel and sand fractions of the sinkhole material were deposited in the floodplain and upper tidal area. It was also assumed that a limited quantity of sand was deposited in the non-tidal stream channel (i.e. 100 cubic yards) but that most of it was transported to the tidal delta. The silt, loam, and other soil particles, which settle out at slower rates, were
Related Questions
- How did you estimate the amount of material (sand, sewage, silt, etc.) that was deposited in Mill Creek, how far it traveled, and where it was deposited in the Creek?
- Were the mineral beds destroyed by a flood of the Colorado River during the 1980’s that deposited a foot of silt over the deposits?
- Can I get an estimate using different types of material including Azek?
