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Weekly Watering Times
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Northern Zone
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(Terra Linda, warmer areas of San Rafael, San Anselmo, Fairfax and West Marin)
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Spray Irrigation - Total Minutes per Week
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Apr
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May
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Jun
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Jul
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Aug
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Sep
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Oct
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Weekly ETo
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1.01
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1.24
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1.47
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1.54
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1.4
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1.06
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0.73
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turf
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33
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40
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47
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50
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45
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34
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23
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high h2o
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24
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29
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34
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36
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33
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25
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17
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low h2o
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10
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12
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15
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15
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14
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11
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7
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Note: The above runtimes are based on a 2" per hour precipitation rate and use the historical ETo for the
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Northern climate zone of Marin. These run times should be adjusted for your system, taking into account your
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microclimate, sun exposure and wind.
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Water Budgeting - % of Summer Peak Schedule
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Apr
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May
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Jun
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Jul
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Aug
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Sep
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Oct
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40%
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60%
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90%
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100%
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90%
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65%
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40%
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The above percentages can be used as a guide to change the watering schedule programmed into your
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automatic irrigation controller by either:
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(1) using the "water budget" feature to increase/decrease all of your stations' run-times by simply changing
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the water budget percentage, or
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(2) using the above percentages as a guide to manually reset your irrigation run-times.
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Drip Irrigation - Total Minutes per Week
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weekly
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High-water-use plants
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Low-water-use plants
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Eto
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1 ft diameter
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2 ft diameter
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3 ft diameter
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1 ft diameter
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2 ft diameter
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3 ft diameter
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Mar
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0.69
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18
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72
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162
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8
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31
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69
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Apr
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1.01
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26
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104
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234
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11
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44
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100
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May
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1.24
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32
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127
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287
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14
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55
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123
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Jun
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1.47
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38
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151
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340
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16
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65
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146
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Jul
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1.54
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40
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158
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356
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17
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68
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153
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Aug
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1.4
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36
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144
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324
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15
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62
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139
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Sep
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1.06
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27
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109
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245
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12
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47
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105
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Oct
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0.73
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19
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75
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169
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8
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32
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72
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Nov
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0.39
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10
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41
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92
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4
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18
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40
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Note: The above run-times are based on using one 1 gallon-per-hour (gph) drip emitter per plant. If using a
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2 gph emitter (or two 1 gph emitters) per plant, cut runtimes in half.
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91 - 98 Totals
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100%
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90%
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60%
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Month
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Rain
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ET
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Northern
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Central
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Southern
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January
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11.16
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0.62
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1.03
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0.92
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0.62
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February
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9.07
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0.96
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1.60
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1.44
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0.96
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March
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4.86
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1.73
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2.88
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2.59
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1.73
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April
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1.74
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2.60
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4.33
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3.90
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2.60
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May
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1.20
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3.16
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5.26
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4.74
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3.16
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June
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0.37
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3.68
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6.13
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5.52
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3.68
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July
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0.00
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3.94
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6.57
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5.91
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3.94
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August
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0.16
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3.51
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5.85
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5.27
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3.51
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September
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0.04
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2.68
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4.46
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4.02
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2.68
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October
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1.14
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1.66
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2.77
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2.49
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1.66
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November
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5.15
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0.76
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1.27
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1.15
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0.76
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December
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6.59
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0.50
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0.83
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0.75
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0.50
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42.97
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38.68
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25.78
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