Summit Engineering Corporation conducted a detailed floodplain study for the Reese River Valley suitable for submission to FEMA for the LOMR process. The hydrological study of the 2,200 square mile basin implemented the most current rainfall data combined with the HEC-s model to estimate the 10, 25, 50, 100, and 500-year peak flows based on the most current soils data to delineate the corresponding base flood elevations. The Hydraulic analysis included the associated peak flow events using the flood hydrograph model HEC-1. The hydraulic model FLO-2D was used to provide a two-dimensional system to accurately model this complex system using Summit topo and USGS data. A digital terrain model (DTM) was developed with 100-foot spacing. Roughness coefficients were assigned to each of the 1,743 elements that were generated.
Summit Engineering personnel conducted extensive geotechnical field investigations, laboratory analysis, and a technical report with recommendations on this project which included approximately two miles of existing levee and two miles of proposed new levee. The project included slope stability analysis which incorporated analyzing the existing and proposed levee slope under several different storm events with the corresponding soil properties under those conditions. Seepage analysis and settlement calculations were also completed. The survey department developed a flight and control plan in support of topographic mapping at a 2’ and 1’ contour interval which covered approximately 7,500 acres. Summit surveying personnel also conducted GPS surveys of photo control, storm drain infrastructure throughout the majority of Battle Mountain, and monument ties with final boundary determination being made along the entire levee alignment.