WMOD00306

• Project Name: Sierra Cooperative Pilot Project
• Title: Sierra Cooperative Pilot Project - Operations Plan - 1986-1987
• Date: 10/1/1986
• Weather Modification - Doc Type: Report

The laboratory analyses will be conducted continually throughout the project
to ensure a timely reporting of the results. This is expected to be consis-
tent with other field activities projected for the ScPP.

The trace chemical analyses to be performed wi 11 be conducted in the clean
room laboratories at the DRI in Reno. The analytical procedures used produce
concentration values which have typical calculated uncertainties of 10 to 20
percent in the case of silver.

For stable oxygen isotope analyses, all samples are specially prepared using
existing sample preparation lines in the Reno laboratories. They are then
analyzed for 018/016 contents using the DRI mass spectrometer in Las Vegas.
.~

E. PRECIPITATION GAUGE NETWORK

The precipitation gauge network for 1986-87 will consist of 17 SCPP gauges.

-""'-'""-~-:::..::::::::;..:.

Table 3-5 is a tabulation of the gauges used, siting, elevation and tower
structure. Figure 3-8 shows the location of these gauges within the ARB.

Gauges have been equipped with a load cell and interfaced to a HANDAR 524 DCP.
d.OOL( ,?l 7
The modified gauges have a digital resolution of one part in 4096 ('\10.10 mm
water equivalent for a gauge with an 8-inch orifice). All network gauge con-
figurations have been standardized, with each gauge using a 10 kg capacity
load cell and an 8-inch gauge orifice. A self-duml"l. auto-refi 11 procedure'
will be implemented a~~~ following its proven success during the last field
season.

Digital data will be radio-transmitted and relayed through a GOES satellite to
the Bureau 1 s Denver down 1 ink. Data are then logged onto the Bureau 1 s PROBE
data base resident on the Denver Perkin-Elmer computer. Data are easily
recovered using Bureau-supported PROBE data access routines.

111-28

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