Running dry

6 07 2025
Replacing a borehole motor in a borehole that ran dry

That the borehole motor was burnt was obvious. The metal casing was blue, there was oil in the water and it wasn’t pumping water. But the reason? The borehole in question has given me endless trouble. It has gone through more than a few motors over the years. We thought we’d finally got it solved last year when it became evident that the old steel borehole casing had rusted away and was collapsing and dumping mud into the pump. It was re-lined with a PVC liner, the pump and motor replaced and I thought our worries were over for the foreseeable future. I was wrong.

Marianne suggested I try contacting Allan, listed on my phone as “Borehole Repair Recommended”. When I described the problem he was straight forward – “Is the pump protected against running dry?” When I answered in the negative he said “That’s your problem. The pump controller you have installed does recognize when the pump is dry but it doesn’t work that well and the pump inevitably cooks. At this time of year (it’s winter and the dry season) the water levels drop and the pumps inevitably run dry. Get yourself a smart controller with liquid level detection and your problems will be over”.

There’s a irrigation equipment supplier close to my business so I paid them a visit to get a new motor and whilst there asked if they had an intelligent controller. Whilst perusing the manual I noticed Nathan, a plumber, who’d done the plumbing on our new on-suite bathroom, was also there. When he heard what I was looking for he recommended going to a nearby hardware store for the controller – “I have personal experience with them and I know they work” he added. I took his advice and installed the new pump and controller and, after decoding the bad Chinese English in the manual, managed to get everything working.

A mere two weeks later Fabian (one of the foremen who does the maintenance amongst other tasks) came to me with a long face and reported that another borehole had stopped working. I told him to get the pump and motor up and sure enough, the motor had all of the characteristics of being burnt. Another trip to the supplier, more cash changed hands, and this time I came away with a replacement motor and two intelligent controllers – including one for the third borehole that I was hoping to preempt the motor burning out.

It all seemed straight forward at first – after all we’ve had plenty of practice at getting borehole pumps and motors up and changed. This one was no different but the intelligent controller just wouldn’t cooperate. The motor drew current like it was working but nothing else happened. Allan was mystified – “I’ve never had a problem like that” so I just had to take a deep breath and book one of his teams to come out this Friday and have a look.

Driving back from work at lunch time I took a more scenic route than usual past the old Mount Pleasant golf course. It hasn’t been used for that purpose for many years now and is largely over grown. It’s not prime development land being low lying and very wet in the rainy season so is untouched – for now. Houses adjoining the area seem to have good ground water and sprinklers were merrily whirring over verdant verges oblivious to (or ignoring) the Harare City Council’s directive that it’s illegal to do so for, make no mistake, Harare is running dry.

Harare’s main water supply is Lake Chivero to the south-west of the city. It is downstream and it doesn’t take a lot of imagination to grasp the scale of the pollution. It’s nothing new, as an eight year-old child I attended a sailing school on the reservoir and can remember a deep revulsion of the state of the water. It recently made headlines when four rhino and various other animals at a lakeside national park were killed by the polluted water. Very little of the available water in the lake now makes it’s way into the Harare water supply. It requires pumping and there’s seldom power to do that and the water purification works have long ago fallen into disrepair. So in true Zimbabwean fashion we’ve had to “make a plan” – usually in the form of having a borehole drilled. That of course is no guarantee that it will not be dry (and most are) but for those of us lucky enough it can be a massive relief and money saver. The unlucky majority have to rely on the burgeoning water supply business and at US$50 for 5,000 litres it isn’t cheap. Water tankers are ubiquitous on the streets and come in all shapes and sizes. Some are made for the purpose but most are just plastic tanks strapped onto disheveled trucks. They source their water from outside the city limits.

Nathan is succinct – “Harare will run dry in five years at the most”. We are luckier than most in having a working borehole but it is not prolific. Tested at 1,000 litres per hour we don’t push our luck and the lawn dies off in the dry season. This year we’ve pumped the swimming pool dry (it’s filled with rainwater runoff collected off the roof) so that we can get the leaks fixed and the pool tiled. Grey water from the kitchen and shower is collected and used on the garden too. We keep our fingers crossed and try to balance having a nice garden without having to recourse to buying in water.

That there is no interest on the part of the government in changing the situation is best summarized in a conversation I had with Anton, my personal trainer, at a nearby gym. His wife, also a person trainer, used to have the Egyptian ambassador as a client. She, the ambassador, told Anton’s wife that Egypt had offered to completely rebuild the water treatment works at Lake Chivero. It would have been a gift from Egypt to Zimbabwe. The Zimbabwean government turned it down; there was nothing in it for them. The ambassador commented that she’d worked in a number of African countries but had never encountered one in which the government cared less for it’s people.


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5 responses

6 07 2025
Tuppit's avatar serene62e84f843a

It is getting serious!

7 07 2025
donmerredinwirelessnetau's avatar donmerredinwirelessnetau

Hi Andy,

You are an amazing bloke ,well done. When I was doing bores we had flow switches on the outlet of the pump , so no water, switched off straight away, I don’t know if that’s any help to you. Also in drought conditions we had variable speed pumps and when was levels were bad , we had them running on low rpms to conserve the water and replenish at the same time , diesels we slowed down the rpms. Maybe you need to go deeper with your bore.?

Thanks for your blog very interesting. Donald Munroe oz.

7 07 2025
gonexc's avatar gonexc

Hi Don, I’d rather have something that stopped the motor before it could run dry at all. There’s also the issue of cost as I rent the property and am responsible for the maintenance of the boreholes i.e. I don’t want to spend a lot of money on something that isn’t mine. The controllers I put in cost between $56 and $81 each. Not too bad if they work as advertised. There’s also an issue in that half the property has been sold to a developer and I will lose about half of my production area which will likely make the business nonviable. Not an incentive to do too much development!

7 07 2025
sweetsselflessc33699cce8's avatar sweetsselflessc33699cce8

Andy,

Say hello to your Medem from me. Nice and toasty up here, but it’s been a wet summer, which happens from time to time. It’s always great to hear news of the old country. May she be worthy of her name.

Eugene

20 07 2025
judy thompson's avatar judy thompson

suggestion for the garden: gather your grass clippings or find some old hay and mulch the hell out of it. You will never have to weed again, or feed the soil, and what water is there will stay there. No more watering.

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