The SEAS team was contracted by the USACE Louisville District for the flowage easement survey around Rough River Lake in Breckinridge, Hardin, & Grayson Counties, Kentucky. The project consisted of 46 maps containing over 300 tracts with an approximate length of 181 miles of flowage easement to survey. The survey effort consisted of the following tasks:
- Control recovery control point at Dam (CM1) & set Primary control for each map. GNSS static observations to create an intricate GPS network relative to CM1.
- Establish pairs of horizontal and vertical control points at the beginning and ends of each traverse area and at intermediate areas along the traverse route as needed
- Recover and survey the existing “fee line” monuments by running a conventional field traverse through the monuments beginning and ending each field traverse with the recently established pairs of horizontal and vertical control points.
SCHEDULE: Notice to proceed was given September 5, 2017. SEAS deployed two-man & three-man GPS & Traverse crews to complete the project. Some of the recorded deeds for the flowage easements were faint and hard to read. Because of this, some maps required additional research at the County Property Valuation Administrator’s office and court house. Additional deeds and recorded plats were gathered to better situate the flowage easements in their geographic location.
GPS CONTROL & CONVENTIONAL TRAVERSES: SEAS used Topcon GR3 and GR5 dual frequency GPS receivers to establish primary and traverse control for each map. SEAS used Topcon Robotic Total Stations to survey the “fee line” monuments around the lake in the heavily wooded areas and utilized Topcon GPS receivers during the winter/fall months when the leaves were off the trees to survey the fee line. Note: SEAS crews also located Creeks that were collateral calls in the deeds to help better place each tract as well as locating any signs of possession (fences, etc..) to ensure the tracts were best placed.
DATA PROCESSING: GPS data was processed using Topcon Magnet Tools. STAR*NET-STD Version 8 was used to perform a least squares adjustment on the horizontal traverses. Once the data was processed, the location of the “Fee Line” monumentation & other property locations were input into CADD. The deeds were input into the drawing and the Flowage Easement was best fit to the existing “fee line” monumentation. A map for each individual flowage easement that indicates the deeded flowage easement lines and corners, US tract number, elevation 534’ MSL contour, subdivision names, and normal summer pool was produced. In addition to the map, a geodatabase of the required features was produced and delivered.