Correspondences Related to CREST and Funding of CREST Program

• Description: Correspondences Related to CREST and Funding of CREST Program
• State: CO
• Title: Correspondences Related to CREST and Funding of CREST Program
• Water Supply Pro - Doc Type: Correspondence

the other objectives. Production of
of increased snowpack, if any, will
water and confirmation of the
be thoroughly studied as the
resulting increases will help in
demonstration progresses. Suspension
deciding on the best use and
criteria will be used and revised
distribution of the additional water.
during all phases of the program as a
supplies. ,,..
safeguard against potential flooding,
percent of the available moisture in -
avalanche or other hazards.
Environmental and social impacts, as.
surface as snow.
well as the reduction of any -risks
Public Involvement and understanding
associated with cloud seeding, will
of the CREST program and its
be considered throughout the
objectives are vital to the success
demonstration. These factors will
of the demonstration. Public
influence the use of the technology,
acceptance and support are important
and will.help in the evaluation of
to the realization of a fully
the results and benefits of the CREST
..operational weather modification
program. . The enxi ronmental effects
program in the Colorado River Basin.
percent, or another 1 percent-of the- -,--
causes ice crystals to farm because
The principles involved in seeding
winter (orographic) clouds are
relatively simple. The flow of moi s
air over mountain barriers produces
liquid water droplets through
condensation as the air is forced
into colder temperatures at higher
elevations. These droplets tend to
remain in the liquid state without
freezing at temperatures lower than
0oC (32 °F) because of the purity of
the water and the absence of foreign
particles in the free atmosphere;
they are referred to as "supercooled
droplets" and the clouds they form
and silver iodide, which has a
physical-structure similar to that of
natural Ice crystals. ice crystals
t formed by seeding can convert more
supercooled water to snow, and
thereby increase the "efficiency" of
the clouds.
The technology of modifying winter
cloud systems to increase mountain
snowpack has been developing over the
past 30 years. Evidence about the
potential for snowpack augmentation
in the high mountains of the Colordo
River Basin is largely based on
statistical data from past projects
y �_
SEEDING. WINTER STORMS t. _ . �. ;
JF are called supercooled clouds. If
ice particles occur naturally, or are
In the high country of- "the Colorado,.
introduced artifically into these
River Basin, as in all other winter
supercooled clouds, the ice particles
storm areas, only an estimated 10
will grow at the expense of the
percent of the available moisture in -
droplets, and begin to reach the
seasonal-storms falls to the surface
surface as snow.
as snow. The remaining moisture. -
stays in the atmosphere and disperses
,If the concentration of natural ice
without ever changing to snow or
..., particles is too low for
rain. Cloud seeding can improve the
precipitation to form and fallout to
efficiency of the natural - :; _:.
:s : occur, the ice particle concentration
precipitation process. and, under.
_. can be i ncreased through the use of
favorable conditions, increase
seedi ng material . The - most common
seasonal precipitation by 10 to 15
seeding agents -are dry ice, which
percent, or another 1 percent-of the- -,--
causes ice crystals to farm because
available moisture.
of its extremely cold temperature,
The principles involved in seeding
winter (orographic) clouds are
relatively simple. The flow of moi s
air over mountain barriers produces
liquid water droplets through
condensation as the air is forced
into colder temperatures at higher
elevations. These droplets tend to
remain in the liquid state without
freezing at temperatures lower than
0oC (32 °F) because of the purity of
the water and the absence of foreign
particles in the free atmosphere;
they are referred to as "supercooled
droplets" and the clouds they form
and silver iodide, which has a
physical-structure similar to that of
natural Ice crystals. ice crystals
t formed by seeding can convert more
supercooled water to snow, and
thereby increase the "efficiency" of
the clouds.
The technology of modifying winter
cloud systems to increase mountain
snowpack has been developing over the
past 30 years. Evidence about the
potential for snowpack augmentation
in the high mountains of the Colordo
River Basin is largely based on
statistical data from past projects
y �_