UBCNews - Business - Mechanical Aquatic Harvesting: Clearing CA Waterways Without Restrictions

Episode Date: February 24, 2026

So, have you ever wondered why some California waterways can't be used for days, sometimes weeks, after vegetation treatment? Today we're tackling a solution that's changing the way water infrastructure managers across the state handle aquatic vegetation. Welcome to the show! DK Aquatic, Inc. City: Yountville Address: DK Aquatic, Inc. Website: https://dkaquatic.com

So have you ever wondered why some California waterways can't be used for days, sometimes weeks, after vegetation treatment? Today, we're tackling a solution that's changing the way water infrastructure managers across the state handle aquatic vegetation. Welcome to the show. Thanks for having me. Yeah, this is a huge issue. Traditional chemical treatments come with these mandatory water use restrictions that can really disrupt operations. but mechanical aquatic harvesting provides a completely different approach. Right, and that's the key difference we're looking at today. Let's start broad.

What exactly is mechanical aquatic harvesting, and why should water infrastructure managers care? Fundamentally, mechanical harvesting is direct biomass removal. Instead of treating plants in place with chemicals, specialized equipment physically cuts and extracts aquatic vegetation from the water body, submerged plants, floating mats, emergent species like tool and cattail. The harvested material is offloaded to an excavator on shore and then trucked to a designated spoils area for disposal. So you're literally taking the problem out of the water entirely.

That sounds straightforward, but I imagine the benefits go deeper than just removing weeds? Exactly. When you remove biomass entirely, you restore hydraulic capacity immediately. Think about stormwater basins, wastewater treatment ponds, flood control channels. These systems need to move water efficiently. Dense vegetation obstructs flow paths, threatens intake structures, and can cause serious operational headaches. And you mentioned wastewater ponds. I'm curious.

How does mechanical harvesting help in those regulated environments specifically? Great question. In wastewater treatment facilities, inspection access is critical. Overgrown vegetation can block operators from performing routine maintenance and compliance checks. Mechanical removal clears those access points without introducing chemicals into an already sensitive treatment process. Plus, there's no waiting period. You can resume normal operations right away. I remember one facility manager telling me they'd been scheduling treatments around holiday weekends just to minimize operational disruption. With mechanical harvesting, that juggling act disappeared.

Mm-hmm. Interesting. So to everyone listening who manages water infrastructure, think about the downtime you face with traditional methods. This approach eliminates that bottleneck. Definitely. And there's another angle here, nutrient cycling. When plants are treated chemically, they die and decompose in the water. That decomposition consumes dissolved oxygen and recycles nutrients back into the system, which can fuel more algae and vegetation growth. Mechanical harvesting removes that organic material entirely, so you're breaking the nutrient recycling loop. Right. So you're not just treating the symptom. You're actually removing the source material before it can contribute to future problems. Exactly right. And, I mean, California has some pretty strict regulations around aquatic pesticide use. Back in 2002, the state began regulating aquatic pesticides with NPD's permits. By 2013, a statewide general permit for residual aquatic pesticide discharges became effective. So any point source discharge from a boom or nozzle requires permitting. For many agencies, that's a lot of administrative overhead. So less red tape, faster action.

That point about administrative simplification sets up our next piece, how equipment ownership factors in. But first, a quick word from our sponsor. Managing aquatic vegetation in California's regulated water systems requires reliable infrastructure-focused solutions. mechanical aquatic harvesting services remove submerged, floating, and emergent plants from stormwater basins, wastewater ponds, reservoirs, and flood control channels statewide. With company-owned equipment and direct biomass extraction, operations restore hydraulic capacity, improve circulation, and avoid water use restrictions. Find mechanical aquatic harvesting evaluation and site-specific strategies at dequotic.com. Picking up on administrative simplification, how does a mechanical aquatic? equipment ownership impact reliability and project execution.

That's where operational control becomes crucial. Specialized aquatic harvesting equipment is designed to operate in shallow water, restricted access environments, and heavily vegetated systems. When you own that equipment outright, you ensure scheduling reliability and consistent field execution. You're not waiting on third-party rentals or dealing with unfamiliar operators who might not understand your site's specific challenges. Makes sense, so it's really about having the right tool ready when you need it. Now, let's talk integration. How does mechanical harvesting fit into broader, long-term aquatic vegetation management strategies?

That's where the real value shows up. Mechanical harvesting delivers immediate operational improvement. You clear targeted vegetation and restore flow paths right away. But for sustained performance, it's often combined with other methods. The key is treating mechanical removal as part of a toolkit, not a one-time fix. California has a history with this approach. The Department of Parks and Recreation integrated mechanical harvesting into its invasive floating vegetation control program in the Sacramento-San-Walkeen Delta starting in 2013.

Programs at locations like the Tahoe Keys Lagoones have used mechanical harvesting since the 1980s. So there's proven track record across different types of water systems. That's reassuring. Now, you mentioned invasive species earlier. What are the most common targets? And, I got to ask, is there one species that's particularly stubborn? Oh, Lidwiga takes the prize for stubborn. It forms these dense surface mats that choke out native plants and restrict boat navigation.

Tool and cat tail are emergent species that encroach on shorelines and reduce storage capacity in reservoirs and irrigation ponds. Then you've got submerged vegetation beds that accelerate organic sediment, accumulation, and reduce dissolved oxygen circulation. Each species presents unique challenges, but mechanical harvesting is effective across the board. I see, go on. And it's area selective, too. You can target nuisance species without affecting the entire ecosystem. That's a level of control you just don't get with broadcast treatments.

mechanical harvesting sidesteps those permitting hurdles because you're not discharging chemicals. So we've established that mechanical harvesting brings immediate results, avoids water use restrictions, and reduces nutrient loading. How should water infrastructure managers prioritize this in their planning? Think about your facility's core needs. If you're managing a flood control channel and hydraulic capacity is mission critical, mechanical removal should be your first consideration. If you're operating a stormwater basin that feeds into drinking water supplies, avoiding chemical exposure is paramount.

The beauty of this approach is that it aligns infrastructure performance with environmental stewardship. You're protecting intake and conveyance structures, maintaining compliance and restoring circulation, all without the downtime that comes with chemical treatments. That's a practical framework. And for anyone listening who manages municipalities, water districts, or flood control agencies. How do you even start evaluating whether mechanical harvesting fits your site? Schedule a site evaluation, walk the perimeter, assess vegetation density, identify access points for equipment, look at your operational calendar. When do you need full water availability? That'll

tell you whether avoiding water use restrictions is a deal breaker. And honestly, most managers are surprised by how quickly mechanical harvesting can restore function. I love that. I love that. practical, measurable, and fast. Together, we're seeing a shift toward infrastructure-focused solutions that don't compromise water access. Any final thoughts for our listeners? Just this. California's water resources are under constant pressure. Whether you're dealing with invasive plants, regulatory compliance, or aging infrastructure, direct biomass removal is a proven strategy. Mechanical harvesting works because it addresses the root problem. literally pulling it out of the water, and it does so without the operational restrictions

that slow everything else down. Well said. Thanks so much for breaking this down with us today. To everyone listening, if you manage water infrastructure in California, this is definitely a strategy worth considering. Until next...