WMOD00301 ‎(2)‎

• Title: Conceptual Plan to Develop Water Augmentation by Weather Modification in the Colorado River
• Date: 5/14/1979
• Weather Modification - Doc Type: Report

ORA F T

~

fallout of the precipitation is within a range which allows it to
fall into the target area. The statistical postexperimental stratifi-
cat 'ion 'of phys ica 1 parameters by Vardiman and Moore defined a
"window" which indicates when seeding would produce positive results.
However, routine identification of the indices requires further
devE!lopment for practical field use. These bounds should be refined
considering the specific conditions encountered at each site. This
redefined "window" can then be used to develop a site-specific
climatology of seeding opportunities.

~'

c. Treatment of Opportunity

After identifying a seeding window, it is essential that the window
be treated effectively to produce optimum results. Since the bounds
of (I seeding window are finite in both time and space, it is critical
that: any seeding system be able to introduce an effective seeding
material into the cloud at the appropriate time and position. There
are presently two categories of seeding materials and two delivery
techniques that have the most potential for being effective with
orographic clouds.

"

Seed: i ng mater i a 1 s can be categor i zed accord i ng to the method by wh i ch
they create ice crystals, either by heterogeneous or homogeneous
nucleation. Both types of seeding materials have been shown to be

'::1"

43