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Tag: water levels

Thursday 21 January 2016

A Miracle of Nature – the Okavango Delta and its changing water levels

Buffalos in the Okavango Delta

Buffalos in the Okavango Delta

As you may be aware the water levels in the Delta are dropping fast and furiously this season. Boating and mekoro activities are being stopped in most areas as either there is no more water left, or it’s packed with crocodiles and hippos who are holding on to the last bit of wet that is available out there, which means: we really don’t want to place our guests in the middle of it all on a boat or mokoro.

The Okavango has gone through wet and dry spells as long as time. Local rainfall, Angolan rainfall, small seismic shifts in the underlying tectonics, it all makes for a rather involved and very unpredictable miracle of nature. For the past years, we could all lean back, almost guarantee water activities for most of the year in lots of areas and have our clients looking forward to gliding across the delta on a mokoro and zooming through the papyrus lined channels.

Okavango Delta

Okavango Delta

Currently we are looking at a totally different scenario, the Okavango is at its driest since a long time. I’m sure some clients will be a bit disappointed about missing out on their water experience. Did the Okavango cheat us? Maybe we have to change our approach in how we present it? The Okavango Delta is one of Africa’s last wildernesses. There is no regulating its flows, it’s left to nature, the water comes and goes and the animals adjust to whatever comes along. The delta has hundreds of different faces. Wetter ones, drier ones, and lots and lots in between. Every single season has its very unique upsides. Sure the bush is thick and rather impenetrable in the rains, but it also makes for wonderful lush background, for happy and relaxed animals, lots of babies everywhere, for dramatic skies, and it is all dotted by the summer migrants who come visit.

The dry months are more dramatic, the animals are bound to being close to water, there is high competition for food and the air vibrates around the hot spots. The lines between dry and wet months have started becoming rather blurry, climate definitely has changed. So maybe we should wave good bye to trying to predict the next season as clearly as possible and prepare our travellers as meticulously as we can on what exactly to expect. Let’s rather convey a message of being open minded for anything that nature and the Okavango have up their sleeves for us. In average years it might be this and that, but we cannot know exactly, we can only guarantee that it will be wild, untamed, untampered with, that it will be “the real thing”.

We need to focus on that Miracle of Nature and understand that change brings new opportunities in the Delta. The game is more concentrated as the water levels drop, and the sightings can be more varied and exclusive. This is the reality of our “Backyard” and rather than missing a water experience, you are part of one of Wildest Africa’s greatest natural events.

Andrea Reumerman

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Andrea Reumerman

Sunday 6 January 2013

The Okavango Delta – some true insider information about the water levels

THE OKAVANGO DELTA 

“Unfortunately there is not enough water in the Okavango Delta during the rainy season for boat excursions”

“The water levels of the Okavango Delta are the highest during dry season”

Have you also read one of those before and wondered?

The Okavango Delta is a very unique part of the world. Looking at a satellite image you can easily see a few blue lines meandering from the Angolan highlands all the way to Botswana, forming a magnificent river that spreads into an alluvial fan and then simply disappears. It creates an amazing oasis in the middle of the World’s biggest stretch of sand, the Kalahari, reaching from Congo to South Africa. Magic. But the true magic is in the timing of the flood!

Rainy season in the catchment area and around the Okavango usually begins in November, with the majority of rain falling in January and February. The local rainfall only contributes to between 2 and 25% of the delta waters, the majority of water is coming down from the Angolan highlands.

If we traveled with a little drop of water from the source of one of the main contributories, the Cubango and Cuito River in Angola, the start of our journey would be quite exciting, through the Angolan highlands and then down to Botswana, but even before we’d cross over the border we’d already travel at a rather leisurely pace simply due to the lack of gradient. It takes this little drop of water average 8-9 weeks to reach Botswana and the panhandle of the Okavango Delta. From here onwards the journey slows down even more: the Northern part of the Okavango is 250km away from the Thamalakane fault line – the delta’s Southern border – but there is only a difference of 50 meters in altitude! The main waters reach Botswana in April and start to spread throughout the alluvial fan slowly filling up the channels, backflows and floodplains, with the delta being at its fullest in July/August. From August onwards the water levels start going down again due to evapotranspiration now exceeding the input by rain waters. The driest period in the delta is in October and November, when food is scarce and animals are found around the remaining water sources and rivers. Many channels have dried up, avid birders can’t get enough of all the bird life gathering around fish traps as the water keeps receding and cars can be used where just a few months ago boats were necessary to get around. Just then the first rains fall again, the shades of brown start turning into shades of green once more, impala and other antilope drop their young and the cycle starts over – the Okavango becoming a place of plenty. The water levels in the heart of the delta though will only rise significantly once the rains have long gone.

Eagle Island Camp - sunset (December)

Eagle Island Camp Sunset in December

So what does this mean for us selling the destination?

This region is highly dynamic. Each year presents a varying amount of flood water in winter and a varying amount of rain falls in summer. Being nature, this provides a certain amount of unpredictability and nobody knows what will happen from one year to the next.

A well rounded Botswana Safari consists of game drives in drier areas and also water activities, be it by boat or mokoro. Mekoro are ideal to travel over floodplains in shallow water, gliding through reeds, discovering the little hidden gems of the area. Once the floodplains have fallen dry it becomes difficult to offer mokoro excursions due to safety concerns in deeper waters of permanent channels and rivers. Even if those deeper waters are actually not that deep anymore, they are considered prime real estate amongst hippos in not that great a mood as their territories are shrinking with the receding water and they are now very much up close and personal with their competitor and neighbor….

It is far easier on the nerves to observe those dynamics from a motor boat, but be aware that cruises can be a lot shorter due to a lack of either depth or river altogether! Eagle Island Camp for example, a camp that often has been sold as typical water-based delta experience, may not be able to offer mokoro during very low flood levels. The camps shift their focus. The floodplains may not be ideal for mokoro anymore, but they provide wonderful grazing for herds of buffalo as around Duba Plains; around Jao Camp the floodplains fill up with big herds of lechwe, enjoying the greenery. Other camps might not be that heavily affected and still happily take their guests on mokoro excursions and motor boat activities.

Here in Maun the flood levels of the Okavango Delta are an everyday topic and we never get tired of it. When did “the wave” come past Nxamaseri, has the water already moved towards Vumbura, when will it reach Sandibe… There is no end to it!

The delta is a truly wild place, it is alive and offers mind-blowing experiences on land and water year round. For next year: Let’s just keep the waterlevels in mind and choose the camps that offer water-based activities wisely.

Lechwe - Jao Camp (copyright Wilderness Safaris)

Jao Camp – Lechwe in the Okavango Delta

 

Andrea Reumerman

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Andrea Reumerman

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