Mark specific intervals along your imaginary line. The closer the interval, the more accurate your calculations. As you measure across the pond, continue to mark your intervals. Place a marker at each end of your line. Transfer your distance to a sketch or piece of graph paper.
Transfer distances to sketch or a piece of paper.
STEP 3 Select the longest width line that is perpendicular to your base line and mark off your selected intervals beginning from your base line and working outward. Measure and transfer to sketch. You should now have a scale drawing of your pond. To compute area, simply multiply your interval by itself to determine square feet per box, count the number of boxes and multiply that number with your square feet per box. Divide by 43,560 sq.