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1 2 3 4 5 6 <br />Jan 3.43 0.00 3.43 1.24 0.68 2.75 <br />Feb 2.94 0.00 2.94 1.96 1.08 1.86 <br />Mar 2.71 0.00 2.71 3.41 1.88 0.83 <br />Apr 1.31 0.00 1.31 5.10 2.81 0.00 <br />May 0.61 0.00 0.61 6.82 3.75 0.00 <br />Jun 0.15 0.00 0.15 7.80 4.29 0.00 <br />Jul 0.03 0.00 0.03 8.06 4.43 0.00 <br />Aug 0.04 0.00 0.04 7.13 3.92 0.00 <br />Sep 0.27 0.00 0.27 5.40 2.97 0.00 <br />Oct 0.93 0.00 0.93 3.72 2.05 0.00 <br />Nov 1.93 0.00 1.93 1.80 0.99 0.94 <br />Dec 2.92 0.00 2.92 0.93 0.51 2.41 <br />Total 17.27 17.27 53.37 29.35 8.79 <br />1. Ave monthly precip for Lodi, Western Regional Climate Center <br />3. "Available Precip" equal to ave monthly precip minus estimated runoff volume; <br />6. Net rainfall recharge ("deep percolation") equal to Available Precip (3) minus Actual ET (5); negative values set equal to zero <br />a. Key reference: University of Calif. Division of Agriculture and Natural Resources: Estimating Landscape Water Requirements (Table 1) Plant Type Plant Factor <br />https://ucanr.edu/sites/UrbanHort/Water_Use_of_Turfgrass_and_Landscape_Plant_Materials/SLIDE__Simplified_Irrigation_Demand_Estimation/Tree, Shrubs, Vines, Groundcovers 0.5 <br />(woody plants) <br />b. Site Development Conditions: Herbaceous Perennials 0.5 <br />Fraction of Total Plant Factor*Product Desert Adapted Plants 0.3 <br />0.25 0.1 0.1 Annual Flowers & Bedding Plants 0.8 <br />0.25 0.5 0.125 General Turfgrass Lawns, cool-season (tall fescue, Ky. <br />bluegrass, rye, bent)0.8 <br />0.25 0.8 0.2 General Turfgrass Lawns, warm-season (bermuda, zoysia, <br />St, Augustine, buffalo)0.6 <br />0.25 0.5 0.125 Home Fruit Crops, Deciduous 0.8 <br />1.00 0.55 Home Fruit Crops, Evergreen 1.0 <br />Home Vegetable Crops 1.0 <br />Notes: <br />Example Water Balance-Recharge Analysis - Lodi, California <br />(ETo Climate Zone 12) <br />Ave Precip. <br />(in/month) <br />Average Runoff <br />Volume <br />(fraction) <br />Available Precip. <br />(in/month) <br />Month Potential ETo <br />(in/month) <br />Actual ET <br />(in/month) <br />Net Rainfall <br />Recharge <br />(in/month) <br />* Per Table 1 for applicable landscape categories; for impervious areas assume nominal 0.05 to 0.10 to <br />account for evaporation of rainfall retained on paved surfaces, gutters, etc. <br />2. Estimated average monthly runoff volume; zero assumed for this example, with full onsite retention of rainfall on level <br />site. <br />4. Reference ETo obtained from CIMIS for Zone 12, Eastside Sacramento-San Joaquin Valley; represents value for lawns and other uniform turf <br />areas <br />5. Actual ET adjusted based on site specific landscape/plant cover factor (fractional multiplier); see below for calculating "composite" factor, <br />0.55 for this hypothetical example <br />1. From UC reference; note Plant Factors are annual average values; additional <br />refinement may be needed for seasonal crops <br />Herbacious Perrenials <br />Land Condition <br />Composite <br />Table 1. Plant Factors (PF) for established landscape plants, turfgrasses, and <br />garden crops to provide acceptable performance in California1.Example Calculation of Composite Eto Adjustment Factor for Hypothetical Residential Lot <br />Impervious Area <br />Trees, Shrubs Groundcovers <br />Lawns (cool season)