The winter flood has begun!
The cranberry growing season lasts from April to November; the fruiting buds mature during the winter dormancy period. During the dormant season, severe winter weather could harm or even kill cranberry vines, which is why growers must take preventative measures to protect their crop. Under normal conditions, the temperature steadily drops post-harvest; it is important to wait until the vines go dormant before starting to put the water on. When vines go dormant, they turn burgundy in color:
Our winter flood program starts with making sure the water in the reservoirs is at the level we need. If there has no been significant rain to get the reservoirs to flooding level, we start our wells. We will continue to use the wells to maintain the reservoirs and the stream needed to get the bogs flooded.
The next step is placing boards in the gates to start bringing the water level up in the bogs, much like we do to prep for the flooding at harvest in the fall. “There’s a lot to know. How the water works, where it’s coming from, where it has to go, how to move it the most efficient way,” says Matt Giberson. “It’s not something you learn overnight.” In practice, this means constant awareness and monitoring of where the water is coming from, where it is going, and how much stream is coming down.
Flooding starts by letting in streams from the reservoirs to canals and bogs. Strategic board placement (more boards in the southernmost bogs to catch the water) will get the ditches high and running down to start flooding from the bottom up.
As the water level in the bogs begins to rise, our team begins adjusting the water level in the bogs by adding boards where they are needed. Once the vines are covered and the stream has settled, we adjust the level of the reservoirs to maintain the stream and keep the bogs flooded for the winter. Wells are shut down once bogs are flooded, and only turned on again if it is dry and reservoir levels are dropping.
It is also necessary to make sure we are not losing water anywhere. “Sometimes you can hear the water coming through a gate that’s supposed to hold it,” Matt says. “It’s the same as running diesel fuel; it’s a big waste, and we need to try to stop it or slow it down.” He does this by adding sand or even grass in front of the leaking boards, as sometimes the sand can wash away too quickly.
Once we are flooded, our team needs to constantly monitor the bogs to make sure there are no leaks, that the water level remains steady, and that the stream remains constant. The weather is also a factor: no rain for a long period of time will shrink the reservoirs and wells may need to be started to maintain the water level in the bogs. Matt says, “If it gets cold enough for the water to freeze, I also need to check to see if I have to break any ice to keep the stream flowing, especially on the southeast gates.”
Team communication is crucial to the process, adds Jeremy Fenstermaker, because “an action in one section will have a huge effect somewhere else. It’s important to learn the whole process but it’s even more important to know how it all ties together.”