It may differ from 20 m to 100 m. Closer intervals are demanded if floor level varies abruptly. The cross- sectional line need not be usually be at proper angles to the leading line. This process is ideally fitted to road and railway initiatives. Radial Line Strategy An isohyet or https://contour-survey-in-banglad91111.blog5star.com/32943866/the-5-second-trick-for-contour-survey-in-dhaka