WMOD00595

• Title: Lake Oroville Runoff Enhancement Project - Final Report
• Date: 9/1/1995
• Weather Modification - Doc Type: Report

the location of all gauges within the target area. The project gauges at PLH and MP2 were
moved to ING (lVlt. Ingalls) and BAG (Bagley Pass), respectively, prior to the 1993-94 wint.er
season to obtain better measurements of precipitation within the target area.

Table 2.3.- Precipitation gauge locations.

Station
Kame

3- Letter DCP ID Transit Data Elev. Lat. L-ong.
ID Time Avg. lm, (N) ,Wi
(mini Int. {min;
PLS 34244708 33 15 1575 39.77< 120.70c
BHL 342449DA 34 15 1692 39.830 120.71"
JCC 3424547E 35 15 1951 39.86" 120.63"
WLL 34245AAC 36 15 1966 39.85" 120.53"
BO~ 342461E4 37 15 1585 39.81 c 120.64"
Pl\IP 34247292 39 15 1783 39.82" 120.58"
PLH 34247C40 40 15 1646 39.73" 120.52"
::I.IP2 34248216 41 15 1707 39.71c 120.58<
AGR 34249160 43 15 2122 39.96" 120.76"
BAG 1963 39.94" 120.55"
I:\"G 2243 39.96< 120.62"

Project Gauges

Plumas Eureka
Big Hill
Jackson Creek
Willow Creek
Bonta Ridge
Penman Peak
Pilot Hill
Mills Peak 2
Argentine Rock
Bagley Pass
1\It. Ingalls

DWR Gauges

Gold Lake
Grizzly Ridge
Lake Da'l.is
Pilot Peak

GOL 2058 39.670 120.620
GRZ 2104 39.92" 120.65"
DAY 1759 39.88" 120.47"
PLP 2073 39.79" 120.87"

c-r'
C- j !
The nine project gauges were fully automated weighing gauges (2.2-kg load cell) with 12-in.
orifices. The catchcan was mounted on 11- or 14-ft standpipes and equipped with wind
screens. All gauges provide 0.25-mm resolution. Figure 2.7 shows the gauge site.

.=-----'

Using an auto siphon drain-and-fill system and an antifreeze recharge reservoir, the gauge
was automatically drained when full (requiring about 120 s to drain and fill) and was
recharged with a 20-pct glycerin, SO-pet denatured alcohol nonhazardous antifreeze. The
drain-and-fill cycle occurred when 50 to 135 rom (2 to 5 in.) of precipitation had accumulat.ed.
The exact amount depends on ambient air temperature. The antifreeze reservoir holds 10,
20, or 30 gal depending on the site. The antifreeze-precipitation mix-rure was drained
periodically into a waste reservoir. For those gauges ,\lith a 10-gal antifreeze reservoir, the
waste compartment would oyerflow after 20 in. of water equivalent precipitation had fallen.

The precipitation data were collected on site by a Handar 560A or 540 DCP (data collection
platform>. Precipitation data were collected at 15-min intervals and transmitted hourly via
the GOES satellite to the California Data Exchange Cent.er downlink in Sacramento and the
Reclamation downlink in Denver. Two existing DWR gauges were retrofitted with the same
load-cell technology as the nine project gauges. These sites are located at DA V (Lake Davis)
and GRZ fGrizzly Ridge!.

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