I was there in spring-time, and was then able to see what a wonder-worker water is in Persia.
The pressing need of more water for Tehran has now drawn attention to the proposals of some years ago for increasing the supply.

One of these was to divert to the south an affluent of the Upper Lar, which rises in the Elburz range, and flows into the Caspian.

It was seen that this could be done by cutting a new channel and tunnelling from a point sufficiently high, where the stream runs in an elevated valley between the double ridge of the range.

The work would have been similar, but simpler, to what was completed last year in Madras, where the upper Periyar stream was changed from a western to an eastern flow.

The execution of the Lar project would be easy, and it would not practically affect the volume of water in the main stream, which receives many tributaries below the proposed point of piercing the watershed.