compute the gradient (expressed as a percentage) of the intermittent stream running from the headwaters at 4 62400 3687370 to where it joins another stream at 4 58720 3684900 . note: calculate the ‘run’ (the horizontal distance) as ‘the crow flies’. note: calculate the ‘run’ (the horizontal distance) as ‘the crow flies’. i.e. calculate the distance as straight line, not the longer meandering line of the stream's length.