WMOD00595

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

REPORT DOCUMENTATION PAGE F~_
01,18 No. 070UJf88
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1. AGENCY use ONLY (Le.ve BI.nk) I ~. REPORT DATE 13. REPORT TYPE AND DATES COVERED
September 1995 Final
4. TITLE AND SUBnne 5. FUNDING NUMBERS
Lake Oroville Runoff Enhancement Project
PR
6. AUTHOR(S)
David W. Reynolds and Curtis L. Hartz.ell
7. PERFORMING ORGANIZATION N"ME(S) AND ADORESS(ES) 8. PERFORMING ORGANIZATION
Bureau of Reclamation REPORT NUMBER
Technical Service Center R.95.12
DC'llver CO 80225
lit SPONSORINGlMONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. $PONSOR1NGlMONITORING
Bureau of Redamation AGENCY REPORT NUMBER
Denver Federal Center DlBR
PO Box 25007
Denver CO 80225-0007
11. SUPPLEMENTARY NOTES
Microfiche and hard copy availablt! at the Technical Service Center, Denver, Colorado
12.. DISTRIBUnONlAYAILABllITY STATEMENT 12b. DISTRIBunON CODE
Available from the National Technical Information Service,
Operations Division, 5285 Port Royal Road,
Springfield, Virginia 22161
13. ABSTRACT {M../mum 200 worda}
Burl'au of Reclamation cooperated with California Department ofWnter Resources to design and implement a
snowpack augmentation program to increase runoff to Oroville Reservoir. The program involves collection of
data to document physical processes leading to increased precipitation. This report summarizes main results
from 3 yr of in-situ physical studies and statistical analysis of precipitation data collected during 87 randomized
seeding cases. Liquid propane released from high elevation sites has proven to be a viable, reliable method of
8et.!().ing wintertime clouds in the Sierra Nevada. Targeting of seeded crystals produced from the propane
dispenser has proven difficult. Based on these findings, project suspension is appropriate after 3 yr and project
rede!lign is nt.'Ccssary. Propane seeding can increase snowfall when excess supercooled water is available. The
questions yet to be answered are: what propane release rate is required to produce significant snowfall, is 8uch a
release rate economical, and can dispenser sites be located that will allow upward transport of ice crystals and
adequate time for particle growth and fallout in the target area? The potential importance of being able to seed
slightly supercooled clouds, which are found in abundance during the winlt~r in northern California, ill too great
to ignore these questions.
14. SUBJECT TERMs--atmol'lpheric research! metCQrologyl weather modification! cloud 15. NUMBER OF PAGES
seeding! precipitation augmentation! meteorological instruments! Sierra Nevada! 133
Middle Fork Feather River Watershed! Lake OrovilleJ Plumas County, CN Wmmtch Hi. PRICE CODE
Plateau, UTI
11. SECURITY CLASSIFICATION 18. SECURITY CLASSIFICAnON 19. SECURITY CLASSIFICATION 20. LIMITATION OF ABSTRACT
OF REPORT OF THIS PAGE OF ABSTRACT
UL UL UL UL

NSN 1540.01.2110-5500

St.nd.rd Form 298 (R.v. 2-89)
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