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Earlier editions: 2026-09

Title 13 — UTILITIES›Chapter 13.40 — WATER-EFFICIENT LANDSCAPE

Portola Municipal Code Appendix A Reference Evapotranspiration (eto) Table

Portola Municipal Code · 2026-10 edition · updated 2026-10-04 · Portola

Cite as: Portola Municipal Code Appendix A · Text as of 2026-10-04

Appendix A - Reference Evapotranspiration (ETo) Table*

County and City Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual Eto
PLUMAS
Portola 0.7 0.9 1.9 3.5 4.9 5.9 7.3 5.9 4.3 2.7 0.9 0.5 39.4
Quincy 0.7 0.9 2.2 3.5 4.9 5.9 7.3 5.9 4.4 2.8 1.2 0.5 40.2

* The values in this table were derived from:

  1. California Irrigation Management Information System (CIMIS);

  2. Reference EvapoTranspiration Zones Map, UC Dept. of Land, Air & Water Resources and California Dept of Water Resources 1999;

  3. Reference Evapotranspiration for California, University of California, Department of Agriculture and Natural Resources (1987) Bulletin 1922; and

  4. Determining Daily Reference Evapotranspiration, Cooperative Extension UC Division of Agriculture and Natural Resources (1987), Publication Leaflet 21426

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Portola Municipal Code

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