Why grading and drainage is needed in Newman
On ground this flat, water spreads instead of running, so the fall has to be built into it. The city and its surroundings sit at about eighty to a hundred feet on alluvial sediment, and much of the flooding here is shallow sheetflow from Orestimba Creek, generally less than two feet deep. On a private lot that means a measured fall and a swale keep the water moving past the walls, while the creek channel and its embankments are the City's work. The California Building Code sets the fall at the foundation.
Most of the town's storm water reaches one pump station through irrigation ditches, not a city pipe network. Runoff is collected in pipes and CCID ditches and taken to the pump station at Canal School Road and Inyo Avenue, with a handful of lift stations moving the rest, and in 2006 the Inyo Avenue trunk was recorded as the main bottleneck. Storm water is not treated here; it drains to the Newman Wasteway and on to the river, so a private drain discharges to an approved point the district or the City accepts.
Some of the ground swells with the water in it, and the rain arrives in one band. Several soils in Newman's sphere of influence rate moderate to high for expansion, and the NOAA Newman station puts the year's 11.71 inches mostly between December and March. Water left standing against a footing on expansive soil moves it, so the fall the code asks for is there to carry that winter water off the clay.
A dairy or a warehouse sheds acres of water to very few openings. The industrial ground east of Highway 33, from mini-storage to the F&A Dairy tanks, drains wide roofs and truck yards to a few inlets and dock trench drains, and a pad or lot expansion can reach the acre at which the owner needs state stormwater coverage. Where a grate sits on a walking route, the 2010 ADA Standards allow no opening wider than half an inch across the line of travel.
Digging is regulated before the first bucket. Government Code 4216.2 has the dig area marked in white and the notification centre given at least two working days, with nothing opened until every operator has answered and the ticket renewed by its twenty-eighth day. Grading is excavation under that article, and the CCID ditches and drainage-district tile drains crossing the town make the wait worth having.
In March 1995 Orestimba Creek peaked at 12,000 cubic feet a second and left buildings in Newman under more than two feet of sediment-laden water, the worst flood in the town's history. On ground this flat, the fall and swales a lot is graded with are what keep sheetflow moving past the walls.
Grading and drainage, as delivered in Newman
Newman is 26 road miles from the Modesto base, mostly on Highway 33. Every job leaves the same record: levels before and after, photographs of each drain before backfill, and the water test.
The contractor assigned to the request walks the property, and a wet day tells more than a dry one. Site visit scheduled at a time that suits you. Start date set in the written estimate. Where water spreads, the fall at each wall, the state of the inlets and ditches, and the approved point the site drains to are recorded.
The dig area is marked in white and the notification centre is given at least two working days before anything is opened, and the crew waits for every operator to mark its line or report none. A high priority installation within ten feet brings the operator on site first, and the ticket is renewed by its twenty-eighth day.
A grading permit comes from the City of Newman Building Department at City Hall on Fresno Street, or, for a parcel outside the city limits, from the office confirmed for that address, with the owner's approved plans and any soil report in hand before work starts.
Any trench of five feet or more takes a protective system, spoil is kept two feet back from the edge, no walk or slab is undermined without support, and a competent person inspects the excavation after every rain.
Unsuitable ground is stripped, fill is placed in lifts and compacted without organics or oversize rock, and the backfill at a foundation is set high for later settlement. On expansive ground the finished grade is cut to a fall that carries water off the slab rather than toward it.
French drains on clean gravel and filter fabric, trench drains set in concrete, and pipe or a swale that discharges by gravity or pump to an approved point in a CCID ditch or an inlet, decided by the district or the City.
The finished falls are surveyed, the new drains are run with water to prove they take it, bare ground is stabilised, and the City of Newman building official signs the work off for the owner's file.
Where grading and drainage is needed in Newman
Newman is a flat grid town where subdivisions drain through irrigation ditches to one pump station, and the ground and its history differ block by block.
Downtown and Main Street
A grid of about six by six blocks with the commercial core and the oldest homes, the town's unreinforced masonry buildings mostly downtown, and most of Main Street in the FEMA 100-year flood zone. On old, flat lots the fall a building was set with has usually gone, and the correction resets the levels and gives sheetflow a way past the walls.
Central Residential District
The blocks between Yolo, T, Inyo and P streets that the City names among its highest concentrations of homes needing repair, from roofing to plumbing. On ground this old and level, a settled yard or a blocked inlet holds water where it should be running off.
Highway 33 corridor and the Westside Marketplace
The highway strip of service commercial and, at the south end, the Westside Marketplace shopping center. Acres of parking drain to a few inlets, and a settled bay or a choked inlet leaves water at a storefront threshold, corrected on the parcel.
Industrial zone east of Highway 33
Mini-storage, the F&A Dairy tanks and other industry from Kern Street to the county line, described in the 2006 general plan as a mix of new and older buildings. Wide roofs and truck yards drain to a few inlets and dock trench drains, and a pad or expansion can cross the acre threshold for state stormwater coverage.
Sherman Ranch and Lucas Ranch
North-east subdivisions where the Newman Drainage District's tile drains, laid to lower high groundwater under old farmland, cannot be built over and are kept as greenbelt. The northeast drains by the open channel along Sherman Parkway, and a private lot works around those easements.
Creekbridge, Stephens Ranch and Creek Canyon
Subdivisions drained by CCID ditches rather than city pipe: the Clery Ditch takes the Creekbridge runoff, and the Miller Ditch drains the Stephens Ranch and Creek Canyon areas near Shiells Road. Discharge to a ditch goes to an approved point the district accepts, never a connection a private site can promise itself.
Inyo Avenue and Canal School Road
The city's storm-drain pump station sits at Canal School Road and Inyo Avenue, where most of the urban area drains; in 2006 the Inyo Avenue trunk pipe was the main bottleneck. On a lot upstream of that, holding and metering the site's own water matters when the trunk is full.
Northwest Newman and the Orestimba Road fringe
The 362-acre plan area just outside the city and the rural fringe around Orestimba Road, with historic orchards, old barns and farmhouses; parts lie in a mapped flood hazard zone. Grading and fill in a flood hazard area follow rules of their own, so the scope starts with the mapped zone.
Grading and drainage sub-services available in Newman
Questions from Newman property owners and managers
It can keep the site's own water moving and steer sheetflow past the walls. A measured fall away from the foundation, a swale where there is no room for the fall, and inlets that reach an approved point are what a lot can control; the creek channel and its embankments are the City's. Water that has already come inside a building, carrying the creek's sediment, is a different job and runs on the water damage restoration line.
Not as a matter of course. The Creekbridge, Stephens Ranch and Creek Canyon areas drain through the Clery and Miller ditches, and a private site's water goes to an approved point that the district or the City accepts, never a connection the property can grant itself. Where no approved point can be reached by gravity, the site holds its water and meters it out at the rate the system allows.
Several soils in the town's sphere of influence rate moderate to high for expansion, and expansive clay swells when wet and shrinks as it dries, so ground left wet against a footing moves. Keeping that water off the foundation is the point of the grade: a fall that runs, and a swale where the fall cannot be had. Repair of a slab that has already cracked is work for the concrete and ADA trade.
The trunk pipe and the pump station are the City's to upsize; a private lot protects itself by holding and metering its own water. That means a fall that carries surface water off the building line to an inlet or a small on-site basin, so that when the trunk is full the lot is not adding to the backup. What the site sends out still goes to the point the City or the district accepts.
Enough for water to leave the wall rather than pool against it. The building code puts the fall over the first ten feet from the foundation, with gentler minimums for a swale and for paving in that band, and for houses it looks for six inches of fall in the first ten feet. Where a lot line or an obstruction leaves no room, a swale or another approved way of diverting the water is accepted in its place.
Inside the city limits the permit comes from the City of Newman Building Department at City Hall on Fresno Street; for a parcel outside the limits, the permitting office is confirmed for that address before the scope is written. Whether a grading plan or a soil report is required is the building official's decision, both documents are the owner's, and the work is built to those approved plans and to what the official requires.
Grading and drainage near Newman
