This video demonstrates how to construct a chimney drain and a blanket drain which begins where the chimney drain intersects existing ground and ends at a set distance back from the fill slope interception.
An example of the template can be downloaded here.
Click the video below to play it. To view in fullscreen mode, first click the YouTube link at the bottom of the video to launch the video on the YouTube site. Then, click the fullscreen button (rightmost button at bottom of video).
Recorded in 1280 X 720 resolution.