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t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />tt <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />DEL <br />NORTE <br />PLUMAS <br />MODOC <br />SHASTA <br />TEHAMA <br />TRINITY <br />HUMBOLDT <br />SISKIYOU <br />LASSEN <br />BUTTEMENDOCINOGLENN <br />SOLANO <br />LAKE <br />YUBA <br />SIERRA <br />NEVADA <br />EL DORADO <br />AMADOR <br />ALPINE <br />STANISLAUS <br />MERCED <br />PLACERCOLUSA <br />CALAVERAS <br />SONOMA <br />NAPA <br />SAN <br />JOAQUIN <br />SANTA <br />CLARASANTA <br />C <br />R <br />U <br />ZSANMATEOCONTRA <br />COSTA <br />MARIN SAC R A M E N T OSUTTER <br />TUOLUMNE <br />ALAMEDA <br />MARIPOSA <br />YOLO <br />MONO <br />MADERA <br />SAN <br />BENITO <br />MONTEREY <br />FRESNO <br />TULARE <br />KINGS <br />SAN LUIS <br />OBISPO <br />KERN <br />INYO <br />SANTA BARBARA <br />VENTURA LOS <br />ANGELES <br />SAN BERNARDINO <br />RIVERSIDE <br />ORANGE <br />IMPERIALSAN DIEGO <br />Goose <br />Lake <br />Clear <br />Lake Res. <br />Eagle Lake <br />Lake <br />Almanor <br />Lake Shasta <br />Clair Engle <br />Lake <br />ClearLake <br />LakeBerryessa <br />LakeTahoe <br />Folsom <br />Lake <br />Mono <br />Lake <br />San LuisReservoir <br />Pine Flat <br />Lake <br />Lake <br />Crowley <br />New Don <br />Pedro Res. <br />MillertonLake <br />SuisinBay <br />San Antonio <br />Res. <br />Nacimiento <br />Res. <br />Isabella Reservoir <br />Lake Elsinore <br />Castaic Lake <br />Lake <br />Cachuma <br />LakeHenshaw <br />Tule Lake <br />Sump <br />Lake <br />Oroville <br />Salton Sea <br />P it R i ver <br />P i t River <br />Sa <br />cram <br />e <br />nt <br />oRi <br />verYubaRiverFeatherRiverCacheCr <br />eekA m e ric anRiver <br />Putah CreekRussianRiver <br />Tuolumne R i v e rSanJ <br />oaq <br />uin <br />River <br />Mer c e d R i verSa <br />cr <br />a <br />ment <br />oRi <br />v <br />er <br />Cosum ne sR ive rM o k e lu m n e <br />R iv erStanisla <br />u <br />s <br />RiverMadRiverKlamathKlamathRiverTr <br />i <br />ni <br />tyRiver <br />Tu l e R i v e r <br />K a w e a h R iv e rKingsRiver <br />KernRiver <br />K e rn R iv e r <br />PosoCreek SourthForkKernR.OwensRi <br />verSalinasRiver <br />P a ja r o R. <br />Sisquoc River <br />Santa MariaR. <br />Calaveras R. <br />N <br />a <br />p <br />a <br />Riv <br />e <br />r <br />Thoma <br />s <br /> <br />C <br />r <br />e <br />e <br />k <br />E <br />elRiver <br />S a n L u is R e y R iv e r <br />San D iego R iv er <br />Santa YnezRiver <br />LosAngeles River <br />S a n t a Cl a ra R . <br />S a n t a A n a R i v e rBearRiverRiv <br />e <br />r <br />Owens Lake <br />Honey Lake <br />Buena Vista <br />Lake Bed <br />Tulare <br />Lake <br />Rogers <br />Lake <br />Rosamond <br />Lake <br />Searles Lake <br />Danby Lake <br />Cadiz Lake <br />Bristol Lake <br />Soda Lake <br />Dry Lake <br />Upper <br />Alkali <br />Lake <br />Middle <br />Alkali <br />Lake <br />Lower <br />Alkali <br />Lake <br />FAIRFIELD JACKSON NAPA <br />OAKLAND <br />PLACERVILLE <br />SAN ANDREAS <br />SAN FRANCISCO <br />SAN <br />RAFAEL <br />MARKLEEVILLE <br />YUBA CITY <br />ALTURAS <br />AUBURN <br />COLUSA <br />DOWNIEVILLE <br />NEVADA CITY <br />OROVILLE <br />QUINCY <br />REDDING <br />SACRAMENTO <br />SANTA ROSA <br />SUSANVILLE <br />WILLOWS <br />WOODLAND <br />YREKA <br />MARYSVILLE <br />RED BLUFF <br />EL CENTRO <br />WEAVERVILLE <br />CRESCENT CITY <br />EUREKA <br />UKIAH <br />LAKEPORT <br />REDWOOD CITY <br />SAN JOSE <br />STOCKTON <br />MODESTO <br />SONORA <br />BRIDGEPORT <br />MARIPOSA <br />MERCED <br />SALINAS <br />HOLLISTER <br />MADERA <br />FRESNO <br />VISALIA <br />INDEPENDENCE <br />HANFORD <br />BAKERSFIELD <br />SAN LUIS OBISPO <br />SANTA BARBARA <br />VENTURA <br />LOS ANGELES <br />SANTA ANA <br />RIVERSIDE <br />SAN BERNARDINO <br />SAN DIEGO <br />MARTINEZ <br />SANTA CRUZ <br />14 <br />12 <br />12 <br />11 <br />13 <br />10 <br />713 <br />3 <br />1 <br />4 <br />5 <br />8 <br />6 <br />14 <br />16 <br />16 <br />15 <br />15 <br />6 <br />2 <br />3 <br />10 <br />18 <br />17 <br />17 <br />14 <br />18 <br />18 <br />16 <br />16 <br />9 <br />6 <br />4 <br />1 <br />2 <br />1 <br />3 <br />1 <br />1 <br />1 <br />3 <br />12 <br />1 <br />2 <br />1 <br />1 <br />14 <br />14 <br />14 <br />14 <br />2 <br />39∫ <br />120∫ <br />42∫ <br />41∫ <br />40∫ <br />39∫ <br />119∫ <br />38∫ <br />118∫ <br />37∫ <br />117∫ <br />116∫ <br />36∫ <br />115∫ <br />35∫ <br />34∫ <br />33∫ <br />115∫ <br />116∫ <br />118∫ <br />33∫ <br />117∫ <br />119∫ <br />34∫ <br />120∫ <br />35∫ <br />121∫ <br />36∫ <br />122∫ <br />37∫ <br />123∫ <br />38∫ <br />121∫122∫123∫124∫ <br />42∫ <br />41∫ <br />40∫ <br />124∫ <br />COASTAL PLAINS HEAVY FOG BELT <br />Lowest ETo in California. Characterized by dense fog <br />COASTAL MIXED FOG AREA <br />Less fog and higher ETo than zone 1 <br />COASTAL VALLEYS AND PLAINS AND NORTH COAST MOUNTAINS <br />More sunlight than zone 2 <br />SOUTH COAST INLAND PLAINS AND MOUNTAINS NORTH OF <br />SAN FRANCISCO <br />More sunlight and higher summer ETo than zone 3 <br />NORTHERN INLAND VALLEYS <br />Valleys north of San Francisco <br />UPLAND CENTRAL COAST AND LOS ANGELES BASIN <br />Higher elevation coastal areas <br />NORTHEASTERN PLAINS <br />INLAND SAN FRANCISCO BAY AREA <br />Inland area near San Francisco with some marine influence <br />SOUTH COAST MARINE TO DESERT TRANSITION <br />Inland area between marine and desert climates <br />NORTH CENTRAL PLATEAU & CENTRAL COAST RANGE <br />Cool, high elevation areas with strong summer sunlight. <br />This zone has limited climate data and the zones <br />selection is somewhat subjective <br />CENTRAL SIERRA NEVADA <br />Sierra Nevada Mountain valleys east of Sacramento <br />with some influence from the delta breeze in summer <br />EAST SIDE SACRAMENTO-SAN JOAQUIN VALLEY <br />Low winter and high summer ETo with slightly <br />lower ETo than zone 14 <br />NORTHERN SIERRA NEVADA <br />Northern Sierra Nevada mountain valleys with less <br />marine influence than zone 11 <br />MID-CENTRAL VALLEY, SOUTHERN SIERRA NEVADA, <br />TEHACHAPI & HIGH DESERT MOUNTAINS <br />High summer sunshine and wind in some locations. <br />NORTHERN & SOUTHERN SAN JOAQUIN VALLEY <br />Slightly lower winter ETo due to fog and slightly higher <br />summer ETo than zones 12 & 14 <br /> WESTSIDE SAN JOAQUIN VALLEY & MOUNTAINS EAST <br /> & WEST OF IMPERIAL VALLEY <br />HIGH DESERT VALLEYS <br />Valleys in the high desert near Nevada and Arizona <br />IMPERIAL VALLEY, DEATH VALLEY AND PALO VERDE <br />Low desert areas with high sunlight and considerable <br />heat advection <br />Reference EvapoTranspiration (ETo) Zones <br />1 <br />2 <br />3 <br />4 <br />5 <br />6 <br />7 <br />8 <br />9 <br />10 <br />11 <br />12 <br />13 <br />14 <br />15 <br />16 <br />17 <br />18 <br />Zone Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec <br />1 <br />2 <br />3 <br />4 <br />5 <br />6 <br />7 <br />8 <br />9 <br />10 <br />11 <br />12 <br />13 <br />14 <br />15 <br />16 <br />17 <br />18 <br />0.93 1.40 <br />1.24 <br />1.86 <br />1.86 <br />0.93 <br />1.86 <br />0.62 <br />1.24 <br />2.17 <br />0.93 <br />1.55 <br />1.24 <br />1.24 <br />1.55 <br />1.24 <br />1.55 <br />1.86 <br />2.48 <br />1.68 <br />2.24 <br />2.24 <br />1.68 <br />2.24 <br />1.40 <br />1.68 <br />2.80 <br />1.68 <br />2.24 <br />1.96 <br />1.96 <br />2.24 <br />2.24 <br />2.52 <br />2.80 <br />3.36 <br />2.48 <br />5.27 <br />4.65 <br />6.90 8.68 9.60 9.61 <br />9.929.008.066.00 <br />4.03 <br />3.72 <br />3.72 <br />3.10 <br />3.41 <br />3.10 <br />3.10 <br />4.03 <br />3.41 <br />2.48 <br />3.41 <br />3.72 <br />3.10 <br />3.41 <br />2.79 <br />5.70 <br />5.70 <br />5.10 <br />4.80 <br />5.10 <br />4.50 <br />4.50 <br />5.10 <br />4.80 <br />3.90 <br />4.80 <br />4.20 <br />4.50 <br />4.80 <br />3.90 <br />3.30 4.03 <br />4.65 <br />5.27 <br />5.27 <br />5.58 <br />5.58 <br />5.27 <br />6.20 <br />5.89 <br />5.89 <br />5.89 <br />6.82 <br />6.51 <br />6.82 <br />7.44 <br />7.75 <br />4.50 4.65 4.03 3.30 2.48 1.20 0.62 <br />5.10 4.96 4.65 3.90 2.79 1.80 1.24 <br />1.862.403.414.205.275.585.70 <br />5.70 <br />6.30 <br />6.30 <br />6.30 <br />6.90 <br />6.60 <br />7.20 <br />7.80 <br />7.80 <br />7.80 <br />8.10 <br />7.20 <br />8.70 9.30 <br />8.68 <br />8.68 <br />8.99 <br />8.06 <br />8.06 <br />8.06 <br />7.44 <br />7.44 <br />7.44 <br />6.51 <br />6.51 <br />5.89 5.58 <br />5.89 <br />6.20 <br />6.51 <br />6.51 <br />6.82 <br />7.13 <br />7.44 <br />7.13 <br />7.75 <br />7.75 <br />7.75 <br />8.37 <br />8.68 <br />8.68 6.90 4.96 3.00 2.17 <br />1.86 <br />1.552.40 <br />2.704.34 <br />4.34 <br />6.60 <br />6.30 <br />5.70 <br />5.70 <br />5.70 <br />5.40 <br />5.70 <br />5.10 <br />5.70 <br />5.10 <br />4.80 <br />4.80 <br />4.50 <br />4.50 3.41 2.40 1.86 <br />0.931.503.10 <br />3.72 2.40 1.86 <br />2.79 1.20 0.62 <br />0.93 <br />1.862.70 <br />1.803.41 <br />4.03 <br />3.10 <br />3.72 <br />3.72 <br />3.72 <br />4.03 <br />4.03 <br />1.50 <br />2.10 <br />1.80 <br />1.80 <br />2.10 <br />2.10 <br />0.93 <br />1.55 <br />0.93 <br />0.93 <br />1.55 <br />1.24 <br />Monthly Average Reference Evapotranspiration by ETo Zone (inches/month) <br />Total <br />32.9 <br />39.0 <br />46.3 <br />46.6 <br />43.9 <br />49.7 <br />43.3 <br />49.4 <br />55.1 <br />49.1 <br />53.1 <br />53.4 <br />54.3 <br />57.0 <br />57.9 <br />62.5 <br />66.5 <br />71.6 <br />California Irrigation Management Information System (CIMIS) <br />REFERENCE EVAPOTRANSPIRATION <br />Developed as a cooperative project between the <br />Department of Land, Air and Water Resources <br />University of California, Davis <br />And <br />Water Use Efficiency Office <br />California Department of Water Resources <br />Map Prepared by David W. Jones. 1999 <br />Data developed by Richard L. Snyder, Simon Eching, and Helena Gomez-MacPherson <br />Background Data from Teale and USGS Sources <br />Lambert Conformal Conic Projection <br />1927 North American DatumDEPARTMENTOFWATER <br />R <br />E <br />SOURCESST <br />A <br />TEOF CA L I F O R N IALAND,A IR &WATERRE <br />S <br />O <br />URCESUNI <br />VERS <br />ITY <br />OF CALI F O R N IA -DAVISVariablity between stations within single zones is as high as 0.02 inches per day for <br />zone 1 and during winter months in zone 13. The average standard deviation of the <br />ETo between estimation sites within a zone for all months is about 0.01 inches per <br />day for all 200 sites. <br />CALIFORNIA IRRIGATION MANAGEMENT INFORMATION SYSTEM (CIMIS) <br />REFERENCE EVAPOTRANSPIRATION ZONES <br />STATE OF CALIFORNIA <br />ARNOLD SCHWARZENEGGER, GOVERNOR <br />DEPARTMENT OF WATER RESOURCES <br />LESTER A. SNOW, DIRECTOR <br />Lambert Conformal Conic Projection <br />1927 North American Datum <br />DEPARTMENT OF <br />WATER RESOURCES <br />UNIVERSITY OF <br />CALIFORNIA, DAVIS