National Dam Safety Program. Indian Hills Dam (MO 30075), Mississippi - Kaskaskia - St. Louis Basin, Crawford County, Missouri. Phase I Inspection Report.
ANDERSON ENGINEERING INC SPRINGFIELD MO
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Indian Hills Dam was inspected to make an assessment of the general condition of the dam with respect to safety, based upon available data and visual inspection, in order to determine if the dam poses hazards to human life or property. Our inspection and evaluation indicates that the combined spillways do not meet the criteria set forth in the guidelines for a dam having the above size and hazard potential. The combined spillways will pass 16 percent of the Probable Maximum Flood without overtopping. The Probable Maximum Flood is defined as the flood discharge that may be expected from the most severe combination of critical meteorologic and hydrologic conditions that are reasonably possible in the region. The guidelines require that a dam of intermediate size with a high downstream hazard potential pass the PMF. Deficiencies visually observed by the inspection team were large seepage area at toe and lower 15 ft. of embankment severe erosion of berm separating the primary spillway discharges from the downstream flood plain severe erosion of the berm separating the emergency spillway channel from the primary spillway pipe seepage and undermining under the emergency spillway slab numerous small erosion gullies along the downstream face scattered tree and brush growth with dense trees and brush on the downstream face near the west abutment and a deep erosion gully at the west downstream abutment-embankment contact.
- Hydrology, Limnology and Potamology
- Civil Engineering