Rainwater Harvesting Landscape Installation in Ojai

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Rainwater Harvest Project 1100 square foot residence on 1/3 acre lot Ojai, CA - 2009: 

Rainwater Harvest Project 1100 square foot residence on 1/3 acre lot Ojai, CA - 2009 Copyright, 2009 Dub

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1100 square foot weekend home on 1/3 acre outside Ojai, CA Average water use 30,000 gallons per year last three years. This project should capture an average of 14,000 gallons. Copyright, 2009 Dub

Goals: 

Goals Harvest 100% of the water that falls Turn the soil back into a sponge Hold the moisture in the dry season Create an oasis in the arid land of Ojai Copyright, 2009 Dub

Roof calculations: 

Roof calculations Entire roof is 2100 sq. feet, the plan will harvest from only 1790 sq. feet Average Ojai rainfall = 13” 1790 sq foot roof gets 1075 gallons per inch of rain 1075 gallons X 13” = 14,000 gallons of water Projected to capture per year Copyright, 2009 Dub

Wind, Sun and Soil: 

Wind, Sun and Soil The site is wind protected by the trees There is dappled shade most of the day. This natural air conditioning cools the house up to 15 degrees The soil has some clay content. There is no top soil—which is the water absorbing living soil. Copyright, 2009 Dub

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BEFORE- Upper terrace drains away from viewer toward RV access and into the street Copyright, 2009 Dub

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BEFORE- Kitchen patio with Augustine grass, soil in poor condition, adjacent horseshoe pit Copyright, 2009 Dub

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BEFORE- Side utility area for trash and ac unit Copyright, 2009 Dub

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DESIGNING THE SWALE NETWORK - The owners consult with landscaper and perma-culture consultant, gypsum outlines the swales Copyright, 2009 Dub

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The swales were dug by hand to an original depth of 18 inches as recommended by the experts Copyright, 2009 Dub

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As the swales are dug to the recommended depths the owner’s grew concerned from both aesthetic and safety perspectives d Copyright, 2009 Di Copyright, 2009 Dub

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Underground trench is dug from the side utility area to the highest swale Copyright, 2009 Dub

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The underground trench connects at the highest swale to direct rooftop rain into the swale network

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All rooftop rain gutters feed to the side utility area. Here we see one of two downspouts that tie into the underground pipes

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Another view of how the rainwater will be directed underground. Rain is carried away from the house, but kept on the property

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The swale network with 4 inches of mulch and gravel patio.A stone retaining wall was built with two stepped entries to the footpath.

The Value of Mulch: 

The Value of Mulch Large amounts of mulch will quickly turn soil into a sponge and create a microclimate. Increases water infiltration Reduces water loss due to evaporation Allows the soil to ”percolate” Copyright, 2009 Dub

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The footpath will be more clearly delineated once succulents, CA natives and other drought tolerant plants are in the swales. Copyright, 2009 Dub

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Looking back toward the pergola which may provide support for drought tolerant vines or fruits like kiwi or lemons. Copyright, 2009 Dub

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Swales will be accented with rocks to provide visual interest and help define the swale contours. Copyright, 2009 Dub

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In the final stages the swales were filled in to only an 8”-10” in depth rather than 18” recommended. Copyright, 2009 Dub

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BEFORE-Kitchen patio with poor soil condition Copyright, 2009 Dub

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BEFORE- Kitchen patio with adjacent horseshoe pit. The water captured in this area is not included in the 14,000 gallon calculation. Copyright, 2009 Dub

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Dirt removed from the swales is used To fill the horseshoe pit. Copyright, 2009 Dub

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The landscaper surveyed the grade and created a berm at this corner to prevent run-off to the street. Copyright, 2009 Dub

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A small grader was used to level and prep the area. Copyright, 2009 Dub

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A crew laid down fabric liner to prevent weed growth under the gravel . Copyright, 2009 Dub

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Three inches of gravel were spread over the patio dining area outside the kitchen. Copyright, 2009 Dub

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The kitchen patio with only mulch and gravel. Copyright, 2009 Dub

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With a rock border, a few succulents in pots and a bird feeding station the patio is already a pleasant low maintenance dining spot. The permeable surface allows more water to be retained in the soil. Copyright, 2009 Dub

January 2010 Storm : 

January 2010 Storm

Overview of the swales: 

Overview of the swales

All rainwater diverted to swales: 

All rainwater diverted to swales

Runoff from next cul de sac: 

Runoff from next cul de sac

No runoff from the property: 

No runoff from the property

Drought tolerant doesn’t have to be cactus : 

Drought tolerant doesn’t have to be cactus

Drought Tolerant Can Be Beautiful: 

Drought Tolerant Can Be Beautiful California is one of 5 Mediteranean regions. Choose plants from any of them.

California Natives —Not Just Weeds: 

California Natives —Not Just Weeds Thoughtfully selected native plants can Add color, form and texture to your yard