Projects aim to increase run-off water to dams

2017-05-18 06:02
Teams employed by Gamtoos Irrigation Board construct concrete weirs and other structures to conserve degraded peat wetlands in the Kromme River system.            Photo:SUPPLIED

Teams employed by Gamtoos Irrigation Board construct concrete weirs and other structures to conserve degraded peat wetlands in the Kromme River system. Photo:SUPPLIED

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AS the water crisis in Kouga and the surrounding region deepens, various Working for Water (WfW) projects are playing an increasingly critical role in squeezing out precious run-off to swell the rivers that feed the major supply dams.

Now, the additional water being harvested thanks to the various projects, is proving a lifeline to the Eastern Cape’s major cities and towns as their supply dam levels dwindle fast.

Implemented across the Eastern Cape by the Gamtoos Irrigation Board (GIB) and funded by the national Department of Environmental Affairs (DEA), the WfW projects focus chiefly on alien vegetation clearance and wetlands rehabilitation, while providing much-needed employment opportunities in rural communities.

According to GIB’s Area Manager for the western region, Edwill Moore, although there is not enough scientifically verifiable data to support claims of increased water flow, anecdotal evidence suggests a major improvement as a result of clearing activities.

“Numerous landowners will testify that af-ter their property was cleared and maintained, the water flow increased dramatically, even during very dry periods,” says Moore.

First rolled out by GIB in 1999, the Kouga and Kromme River projects in particular are among the oldest in the DEA’s Working for Water programme. However, their role in increasing the flow to the Kouga, Churchill and Impofu dams has become even more critical as water levels reach crisis point.

Kouga catchment area

In the Kouga catchment area, Moore said their primary focus was on alien vegetation clearing, with 12 teams from local communities – comprising 14 members each – working to clear mainly Black Wattle (90% of the workload), Pine, Eucalyptus, Hakea and other less common species.

The 282 000-hectare project extends from Haarlem in the west to Kouga Dam in the east, with the Kouga and Tsitsikamma mountains forming the northern and southern boundary respectively.

“To put it in perspective, that’s around 564 000 rugby fields,” explained Moore.

“The water from this catchment area flows into the Kouga Dam, which supplies irrigation water to farmers in the Gamtoos Valley and is also the main water supply dam to the Nelson Mandela Bay Municipality.”

Kromme River project area

Running parallel to the Kouga project, from The Heights in the west to Churchill Dam in the east, is the 40 000-hectare Kromme River project area, where GIB manages both alien vegetation clearing and wetlands rehabilitation projects.

The water from this catchment flows into the Churchill and Impofu dams, which also supply Nelson Mandela Bay.

Although significantly smaller in area than Kouga, the Kromme workload was higher, with 13 teams of 14 working to clear vegetation, said Moore.

“The vision of the wetlands project is to facilitate the protection, conservation and rehabilitation of the degraded peat wetlands in the Kromme River System. Peat has the capacity to store up to 20 times its weight in water, which allows water to remain in the wetlands system for longer.”

Moore explains that a slower release of water and consequent slow-down of run-off would allow sediment to settle more effectively, leading to a cleaner in-flow of water into the Churchill Dam.

“If the wetlands aren’t functioning properly, the water will just flow at a high rate, cost a lot more to purify and there will not be a constant flow of water into the dam,” he adds.

Degradation and erosion

Moore: “To this end, three wetlands teams made it their priority to stop ongoing degradation and erosion by constructing various structures, such as gabions and concrete weirs, to prevent active head cuts from affecting the course and flow of the river.

“During a major flood in 1996, 1.5km of wetland was destroyed due to an active head cut. In 2000, we constructed a combined concrete and gabion weir to stop the head cut and prevent further erosion. Since then, there have been two major floods, and not even a metre of wetland was lost.”

Moore says it had initially been challenging to get buy-in from local landowners, but that the long-term successes and benefits had instilled confidence and opened the door to greater co-operation.

“Over the past year, in both the Kouga and Kromme projects, it has been exciting to see these landowners being prepared to contribute to the cost of clearing operations, and we plan to build on this.”

“The drought has naturally played a role. Currently, we can’t address all the requests we get for clearing, but we are pleased to be working together.”

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