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Irrigation and Drainage in Folsom

Sprinkler and drip system work, controller programming, and winter runoff control.

Irrigation and drainage are the two systems in a Folsom yard that only get attention when they fail, which is usually in the second week of July or the first real storm in November. Irrigation work here covers valve and mainline repair, converting spray zones to drip, replacing controllers with models that hold a multi-program schedule, and pressure regulation on systems running above what the emitters are rated for. Drainage work covers surface grading, area drains, French drains, and downspout tie-ins that carry water past the foundation to daylight. Folsom's watering schedule assigns irrigation days by street address under the city's water conservation stage, and drip irrigation is exempt from the day restriction, which is one of the practical reasons drip conversions keep pace with the rules.

What the scope covers

  • Valve, mainline, and lateral repair, including tracing and locating buried valve boxes
  • Spray-to-drip conversion, with the head bodies retrofitted or the zone re-piped in emitter tubing
  • Controller replacement and programming to the current City of Folsom watering schedule
  • Pressure regulation and filtration on drip zones so emitters run at their rated pressure
  • Backflow prevention assembly inspection and replacement where the device has failed
  • Surface grading and swales to move winter runoff away from the house and off the patio
  • French drains, area drains, and channel drains piped to daylight or to an approved outlet
  • Downspout tie-ins so roof water leaves the foundation zone instead of soaking beside it

Why one long run wastes most of its water

Soil accepts water at a fixed rate. Once a sprinkler applies faster than that, the surplus runs off, and on the tight soils common around Folsom the crossover happens within a few minutes. Splitting the same total run time into shorter cycles with a gap between them puts the same volume into the root zone instead of into the gutter.

Single long irrigation cycle compared with three short cycle-and-soak runs Two bar charts. The upper one shows a single fifteen minute run in which water absorbed levels off after about five minutes and the rest becomes runoff. The lower one shows three five minute runs spaced an hour apart, each staying below the soil intake limit, with almost no runoff. One 15 minute run Three 5 minute runs, one hour apart Runoff to the gutter Water the soil accepts Cycle 1 Cycle 2 Cycle 3 Soil intake limit Soil intake limit
The same fifteen minutes of run time, applied two ways. A single continuous cycle spends most of its later minutes producing runoff. Three short cycles an hour apart stay under the soil intake rate and deliver almost all of the water to the root zone.

On irrigation and drainage work

What days can I water in Folsom?

Folsom assigns landscape irrigation days by street address, and the assignment depends on the water conservation stage the city is currently in. Under the Stage 2 rules the city has published, odd-numbered addresses irrigate Tuesday and Saturday, even-numbered addresses irrigate Wednesday and Sunday, and no landscape irrigation is permitted Monday, Thursday, or Friday. Drip irrigation and hand watering with a shut-off nozzle are treated differently from sprinkler irrigation. Because the stage moves with conditions, the City of Folsom water conservation page is the place to confirm what applies this month.

Why does my yard flood in winter and dry out in summer?

That combination usually points at soil and grade rather than the irrigation system. Much of the ground around Folsom drains slowly once winter rain saturates it, so water sits on the surface and runs toward whatever is downhill, which is often the house. In summer the same soil sheds water off the surface before it soaks in, so a short sprinkler cycle mostly runs off. The fixes are different for each: grading and drains for the winter problem, cycle-and-soak programming and mulch for the summer one.

How much does a drip conversion cost?

Converting an existing spray zone to drip typically runs $350 to $900 per zone, depending on whether the heads are retrofitted with bubbler or emitter conversion kits or the zone is re-piped in inline emitter tubing. A whole-yard conversion on a six to eight zone system generally lands between $2,500 and $6,000, including a pressure regulator, filter, and controller reprogramming.

What is cycle and soak, and why does it matter here?

Cycle and soak means splitting a station run time into two or three shorter cycles with a gap between them, instead of one long run. On the tight soils common around Folsom, a single fifteen minute run puts most of its water into the gutter, because the ground stops accepting water after a few minutes. Three five minute cycles an hour apart put the same volume into the root zone. Most controllers made in the last decade support it directly.

Do I need a backflow preventer on my irrigation system?

Any irrigation system connected to the potable supply needs backflow protection, and the device type depends on the system. Residential systems commonly use an anti-siphon valve or a pressure vacuum breaker. Where a testable assembly is installed, water agencies in this region typically require annual testing by a certified tester. The City of Folsom is the authority on what applies to a specific service connection.

Further Reading

More on this from the field notes

Landscaping a new-build lot south of Highway 50

What a builder hands over on a new Folsom lot, why compacted ground is the first real cost, the two clocks running, and the order to tackle a blank pad in.

The rock in your yard is probably from a gold dredge

Why parts of Folsom sit on washed cobble left by gold dredging, what that rock does to planting, digging, and irrigation, and how to work with it instead.

Two quotes, twenty thousand dollars apart, both honest

Why landscape quotes for the same Folsom yard vary by twenty thousand dollars, which buried line items explain the gap, and the seven questions to ask.

Adjacent Work

Scopes that usually travel together

Landscape scopes overlap more than most trades. Irrigation gets opened up whenever planting changes, and drainage gets decided the moment a patio goes in, so pricing the neighbouring scope at the same time normally costs less than coming back for it.

Landscape Design and Installation

Full yard design and build, from planting plan and grading through irrigation, lighting, and finish planting

Drought Tolerant Landscaping

Lawn conversions and low-water planting designed around Folsom watering rules and a rainless summer

Front Yard Landscaping

Curb appeal work for Folsom front yards, including HOA-friendly planting plans and entry walkways

Hardscaping, Patios and Retaining Walls

Patios, paver walkways, seat walls, and engineered retaining walls for Folsom slopes

Thinking about the yard this year?

Ring (916) 282-5150, or send the form, and a local landscaping company prices the work for nothing anywhere around Folsom.

Call (916) 282-5150 Get a free quote