This paper presents topographic surveys for the road section starting from the crossroad of county roads DJ582 from Resita to Gărâna with DJ582D leading (after turning right from DJ582) to Lake Gozna, Caraş-Severin County, a lake covering 60 ha and measuring 3 km in length. Why this topographic survey? Simply because there are numerous videos, comments and TV programmes on the road section between DJ582 (leading to Slatina Timiș) and the road section DJ582D 4 km from the Village of Văliug and leading to Lake Gozna, along about 700 m, water “flows up the hill” as witnessed by people and videos. Topographic survey necessary to carry out this study was done with a total station Leica TC805 and with an equipment of the GPS Leica 1200 type. The elevation measured with the GPS Leica 1200 equipment at the crossroads of the two roads DJ582 and DJ582D is 605.63 m and that of Lake Gozna is 601.61 m; this points to a level difference of 4.02 m for the county road DJ582D with a slope of 0.6% and a level difference of 9,51‰ for the collecting basin furbished by covering the slopes and the bottom of the canal on the left side of the county road DJ582D when going to Lake Gozna (Văliug) and stretching between 605.63 m at the crossroads of the DJ582 with DJ582D and 599.38 m at the entrance of the collecting canal into Lake Gozna. The claim that on this road section of about 700 m water “flows up the hill” is false. Parallel with the DJ582D on the left along the entire road is a canal that “goes upwards” according to some, but the difference between the two elevations (start and finish) is 6.25 m, the lowest elevation being determined at the entrance of the canal water into the Lake Gozna and the highest elevation being determined at the crossroads of the two county roads. To carry out the topographic survey, we chose for the total station a road supported at both ends by known coordinates and orientations. The station points were determined with GPS Leica 1200 equipment through the RTK (Real Time Kinematic) method. Besides measurements with a total station, where possible, we used for the measurements a double frequency GPS Leica 1200 equipment to determine both the four station points GPS1, GPS2, GPS300 and GPS400, and to survey the land using the reference stations in Reșița and Făget. Downloading the apparatus was done with a Leica Geo Office Combined programme and turning raw coordinates from WGS 1984 into stereographic coordinates 1970 was done with a TransDatRO programme. In the case of the total station, land measurements were made in a local reference system using as starting coordinates for the station point GPS1 X(m)=20.000, Y(m)=10.000 and for the elevation Z(m)=100. Compensating raw data was done with a TopoSys programme, reporting compensated values and making situation plans was done with TopoLT, and AutoCAD programmes. Road and canal profiles were done with a LISP and a ProfLT programme.

Leica TC805, GPS, RTK, ETRS89, WGS 1984, Stereografic 1970, TopoLT, ProfLT, TransDatRO, Toposys, Leica Geo Office Combined

Presentation: oral