In 2022, the Littlerock Creek Irrigation District (LCID) in California began developing a new GIS program that would allow the district to comply with new state requirements while building an asset locations database and sharing location information with its operations staff.
Located in northern Los Angeles County, LCID is a special district that serves approximately 1,400 customer connections. It was formed nearly 170 years ago to provide irrigation ditch water to orchards in Littlerock, known as the fruit basket of the Antelope Valley. Today, most LCID customers are served with potable water delivered through a network of distribution mainlines. Most of this network was constructed in the mid-1900s.
Because the LCID service area is in the western Mojave Desert, there is a constant accumulation of sand and dirt on and along unpaved roads. Distribution system components, particularly valve boxes, quickly become buried. During routine valve exercising or in an emergency, distribution system operators often must use a metal detector to locate valve covers.
Historically, it has been a time-consuming process for district operators to locate and uncover buried valves and related pipelines for repair and maintenance. District operations staff have relied on prior system knowledge and paper as-built record drawings from various mainline construction projects to locate distribution system assets.
On January 1, 2022, a bill (CA Government Code 4216) was passed in California that required all water utilities to leverage a geographic information system to record the location of newly constructed distribution system assets. LCID did not have any GIS data at the time. In response to this new bill, LCID general manager James Chaisson led the district to invest in the development of a system-wide GIS program.
The district needed a central repository for editing and reviewing information, capturing historical institutional knowledge regarding the system, and recording new asset locations and maintenance information.
LCID retained MC Engineering, Inc., an Esri partner, to develop an initial system-wide asset database and an interface for district staff to access GIS on an iPad. MC Engineering is a civil engineering firm in California that focuses on serving municipal water and wastewater systems and specializes in supporting small and midsize utilities. The MC Engineering GIS team serves as an extension of LCID water and wastewater utility staff in the development and maintenance of GIS programs. MC Engineering also provides engineering design, construction management, and grant acquisition services.
LCID worked with MC Engineering to develop a utility GIS program that would become the authoritative source of system-wide asset information. In addition, GIS-based applications were configured to provide staff access to GIS via their iPads. The company began this project by scanning all available LCID distribution system record drawings and saving the PDF images in a geographically rectified format in ArcGIS Online.
A web application was developed to enable district staff to access the record drawings. Staff can open the web map and click a polygon (rectangle) in the vicinity of interest to open the related record drawing. The app allows district staff to carry all related record drawings on their iPad and quickly access the drawings in a specific area.
In tandem with this effort, MC Engineering conducted a high-resolution (3 cm) fixed-wing aerial survey over nearly the entire 5,000-acre LCID service area. Aerial targets were strategically placed by a licensed land surveyor throughout the vicinity to allow the aerial images to be georectified.
The high-resolution aerial photos were processed with ArcGIS software to capture the location of aboveground distribution system assets at accuracies within inches of deviation. Mainline locations were estimated by comparing information shown on record drawings to geographic features shown in the aerial images. The resultant distribution system asset database was saved in ArcGIS Online, which was configured to allow district staff to access the asset locations on a mobile device in the field.
The LCID purchased an Eos Positioning Systems Arrow Gold Global Navigation Satellite System (GNSS) receiver for recording the location of assets that were not visible during the initial aerial survey. This high-accuracy receiver enables staff to locate assets within one centimeter. The LCID distribution operations team was eager to provide feedback and fill in areas of the district that were missed in the initial aerial survey.
MC Engineering staff conducted several one-day workshops with LCID staff to introduce the Eos GNSS receiver and Esri’s ArcGIS Field Maps, and a final two-day workshop to correct upgrades and improvements to the system that were not documented. Discrepancies between the GIS database and old and outdated district prints were resolved based on staff knowledge.
LCID staff now have access to asset locations and related information both in Esri Field Maps on a mobile device and through web applications that are accessed through a central website. Staff can view record drawings and asset locations, and add new asset locations to the GIS.
Steven Rafferty, the LCID distribution operations foreman, said that the new tools and asset database have simplified his work. He now uses the record drawing organization tool many times per week, and he often uses the asset viewing tool to get a quick look at what he is working on or looking for. The GIS program comes in handy to find valves that were mapped with the aerial survey and are now buried. The Eos GNSS receiver enables staff to find a place to dig for pipeline repairs with near perfect accuracy. This typically saves the operators time—from five minutes to several hours—when locating repair locations.
The district has completed an aerial survey as well as initial mapping of system gate valves, hydrants, hydrant valves, and mainlines. The new GIS mapping database is leveraged to record asset locations and information, monitor asset maintenance such as valve exercising, and plan for long-term asset management activities. This asset database has enabled the district to both comply with state requirements and improve operational efficiencies. Staff spend less time locating and relocating assets and more time maintaining the system.
The district plans on expanding the GIS to include water meters and blow-off points. The GIS database will be continuously used to record new construction projects. The district will also continue to refine the recorded locations of select assets that were constructed more than 100 years ago and have no plans on record.
“The experience working with MC Engineering was top-notch. MC Engineering was always there to answer any questions with professional answers. MC Engineering was helpful with gathering the information needed for the implementation of the GIS system,” Chaisson said.
The GIS information gathered will inform current and future district staff members and streamline operator training. LCID team members take great pride in learning more about their system, and see this process as a journey. Even after years of working at the district, new information about the system is continuously being discovered.
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