The devastating soil erosion and human suffering caused by the 1930s
Dust Bowl prompted Congress to create the USDA Soil Conservation
Service and to encourage state conservation departments to form
resource conservation districts (RCDs). As subdivisions of state
governments, RCDs educate landowners to care for natural resources to
assure the long-term sustainability of their own farms and ranches and
to prevent threats to soil stability, water quality, fish, wildlife,
and public health.
Under the authority of the California
State Department of Conservation and with the help of the Soil
Conservation Service, the Westside Resource Conservation District was
established in 1984 as a non-profit organization to conserve not only
soil in western Fresno and Kings Counties but water, air quality, and
energy as well. The district reaches from mid-Fresno County on
the east to the crest of the Coastal Range on the west and from
Kettleman City in the south to Mendota in the north. (See the map of
California RCDs.) One million acres of the district lie in Fresno
County, and 52,000 acres are in Kings County. The programs the Westside
RCD is currently implementing are explained below.
Watershed Management
The marine and continental shelf soils of the Westside Resource
Conservation District contain naturally occurring salts, selenium, and
boron. Additionally, streams flowing from the Coastal Range transport
and deposit selenium, boron, asbestos fibers, and salts on the plains
of the westside during storm events. By forming stream groups for
Coastal Range streams and developing ranch plans, the Westside RCD has
been able to organize landowners and operators and find grants to
install water lines and troughs to water livestock away from easily
eroded stream banks. This has reduced the amount of harmful sediment
that west hills streams carry to the valley floor. The Westside RCD has
also encouraged farmers to vegetate stream banks in the plains.
Together these measures keep Coastal Range storm waters from carrying
selenium, asbestos fibers and other contaminants to the California
Aqueduct, where they could pollute the drinking water of millions of
Southern Californians. Checking the flow of storm water also prevents
flood damage to Interstate 5 and the entry of contaminants into the San
Joaquin River on the east flank of the Westside RCD.
Drainage Management
Over 400,000 acres in the Westside RCD are irrigated. Because of the
naturally occurring salts in west side soils and salts brought to the
soil in surface and well water, a certain fraction of the water applied
to irrigate crops is used to flush the salts below crop root zones.
This saline, subsurface water percolates down until it reaches an
impermeable layer of clay, usually 6 to 10 feet below the surface. Once
this drain water encounters impermeable clay, it flows laterally
northeasterly to the eastern edge of the Westlands Water District.
Approximately 200,000 acres of farmland in the eastern half of the
Westlands Water District has become too water-logged and saline to grow
crops. Westside farmer and Westside RCD board member John Diener has
successfully drained damaged crop land and rehabilitated the soil, and
the Westside RCD has published a manual to show how to do this.
The drainage and rehabilitation process is called Integrated On-farm
Drainage Management (IFDM) and starts with installing perforated pipes
3 to 6 feet below the surface of the land about 100 feet apart to
capture the drain water carrying salts away from the crop root zone.
This drain water is typically 3,000 to 4,000 parts per million (ppm)
salt and is diluted with surface or well water to irrigate Jose tall
wheat grass, a forage grass that removes selenium from the drain water
and soil to produce a preferred selenium-rich forage for cattle whose
diet is selenium deficient. The drain water from the forage field has a
higher concentration of salts than the initial drain water. That water
is diluted and used to irrigate a salt-tolerant crop like cotton. The
drain water from the cotton field is higher in salts than the forage
drain water and is diluted to irrigate salt-loving plants called
halophytes. The drain water from the halophytes has a very high
concentration of salts. This water goes to a solar evaporator where the
salts are separated from the water as it evaporates to the atmosphere.
The salts are collected and sold commercially. Using this IFDM method
of drainage and soil rehabilitation, 98% of drainage impacted crop land
can cleaned to the point that it can grow high value, salt-sensitive
crops like lettuce. The remaining 2% of the land is dedicated to
growing a small acreage of Jose tall wheat grass, salt-tolerant crops
and halophytes. IFDM can be scaled up to treat tens of thousands of
acres of drainage challenged Westlands Water District land. The
Westside RCD will guide the implementation of this immense
drainage management project.
Habitat Development
In
response to the drainage problem in the lower-lying part of the
Westlands Water District, the District has purchased over 70,000 acres
of water-logged, saline, unproductive crop land that it has retired.
Upland habitat consisting of native grasses and shrubs can help the
Westlands Water District control weeds on its retired land, provide
habitat for endangered species like the San Joaquin kit fox, and create
strategically located insectaries to build populations of beneficial
insects. Riparian habitat in the lower parts of west side streams can
become wildlife corridors, insectaries for beneficial insects, and
refuges to build biodiversity. Both riparian and upland habitat can
supply pollen and nectar for native pollinators, offer naturalists
places to watch birds and other animals, and eventually become centers
for eco-tourism. By growing insectaries, wildlife habitat can enhance
Integrated Pest Management on nearby farms; and by growing native
plants it can reduce the pressure of noxious weeds on adjacent farm
land. The Westside RCD will oversee the development of tens of
thousands of acres of upland and riparian habitat in the next 10 to 15
years.
Clean Energy Project
A new and growing activity
of the Westside RCD is getting farmers and agricultural processors to
implement energy efficiency projects and to follow on with renewable
energy projects as they become cost-effective. Three-fourths of the
electricity for pumping water in west side orchards and vineyards could
be supplied by solar photovoltaic panels. Lettuce and melon coolers
could use solar thermal and absorption chilling technologies to
refrigerate their cooling facilities. Almond and pistachio hullers
could convert tree wood and nut shells into synthetic diesel fuel using
advanced gasification technology. Over the next 20 years the Westside
Resource Conservation District will play a major role in converting
agricultural operations in our district to renewable fuels and
energy.