Translate
Resources
The Wilderness Project - Middle Zambezi Expedition
| Author: | Various TWP |
| Language: | |
| Topic: | Water and River Basins |
| Type: | Research |
| Last updated: | 14 April 2026 |
This document provides an overview of a conservation-focused research expedition along the Middle Zambezi River, highlighting ecological, hydrological, and human activity data to support sustainable management and protection of the region's wilderness.
Expedition Overview and Objectives
The Wilderness Project conducted a 9-day research transect along the Middle Zambezi River from Kariba Dam to Luangwa Town to collect baseline data on hydrology, water quality, biodiversity, and human activity to support sustainable river management.
267 km traveled from Kariba Dam to Luangwa Town
12 team members from four African countries
31 research sites established
Data collected included water quality, biodiversity, and river flow
The expedition aimed to inform future monitoring and conservation efforts
Middle Zambezi River and Surrounding Ecosystems
The Middle Zambezi River flows through a UNESCO World Heritage Site, supporting high biodiversity and significant cultural history, with key features like Mana Pools National Park and the impact of Lake Kariba.
Located between Lake Kariba and Cahora Bassa
Part of the Mana Pools UNESCO World Heritage Site
Supports high densities of large game, including over 6,000 hippos
The landscape features mahogany, wild fig, acacia, and baobab trees
Historically significant with evidence of stone age tools dating back 10,000 BC
Mana Pools became a National Park in 1975 after elephant populations were nearly extirpated in the 1800s
The natural landscape is maintained through local communities and conservation efforts
Hydrology and Water Flow Dynamics
The river's flow is heavily influenced by upstream dams, especially Lake Kariba and the Kafue River, with flow measurements indicating significant impacts from dam operations and drought conditions.
Total flow below Kariba Dam was 466 m³/s during the survey
Kafue River contributed approximately 380 m³/s, raising total flow to 849 m³/s downstream of confluence
River flow declines between sites likely due to dam releases and evaporation
Hydrological alterations affect erosion, sediment load, and aquatic biodiversity
Water Quality and Environmental Conditions
Water quality monitoring shows generally acceptable conditions but highlights issues like turbidity spikes and elevated pH linked to dam releases and natural processes.
Water quality mostly within guidelines; turbidity spikes observed
Elevated pH levels require further investigation
Specific conductivity increased after the Kafue River confluence
Water quality influenced by upstream activities, including dam operations and natural weathering
Fluctuations in river levels impact erosion and sediment dynamics
Located between Lake Kariba and Cahora Bassa
Part of the Mana Pools UNESCO World Heritage Site
Supports high densities of large game, including over 6,000 hippos
The landscape features mahogany, wild fig, acacia, and baobab trees
Historically significant with evidence of stone age tools dating back 10,000 BC
Mana Pools became a National Park in 1975 after elephant populations were nearly extirpated in the 1800s
The natural landscape is maintained through local communities and conservation efforts
Hydrology and Water Flow Dynamics
The river's flow is heavily influenced by upstream dams, especially Lake Kariba and the Kafue River, with flow measurements indicating significant impacts from dam operations and drought conditions.
Total flow below Kariba Dam was 466 m³/s during the survey
Kafue River contributed approximately 380 m³/s, raising total flow to 849 m³/s downstream of confluence
River flow declines between sites likely due to dam releases and evaporation
Hydrological alterations affect erosion, sediment load, and aquatic biodiversity
Water Quality and Environmental Conditions
Water quality monitoring shows generally acceptable conditions but highlights issues like turbidity spikes and elevated pH linked to dam releases and natural processes.
Water quality mostly within guidelines; turbidity spikes observed
Elevated pH levels require further investigation
Specific conductivity increased after the Kafue River confluence
Water quality influenced by upstream activities, including dam operations and natural weathering
Fluctuations in river levels impact erosion and sediment dynamics
Biodiversity and Wildlife Populations
The region supports a high density of large mammals, birds, and aquatic species, with notable populations of hippos, elephants, and wetland birds, including rare sightings like Moloney’s Monkey.
6,388 large animals documented; possibly up to 6,500 hippos
Hippo density estimated at over 24 per km, stable compared to past surveys
Other large mammals: impala, buffalo, crocodiles, waterbuck, and elephants
Rare sighting of Moloney’s Monkey in a rocky gorge
Over 400 bird species, including vultures, eagles, and the southern ground-hornbill
Wetland birds like Egyptian geese and reed cormorants are abundant
Invasive Species and Ecological Threats
Invasive plants, crayfish, and other species threaten native ecosystems, with water hyacinth, spongeplant, giant milkweed, and redclaw crayfish being prominent concerns.
Invasive plants like water hyacinth and spongeplant widespread along the river
Giant milkweed found in Sapi Safari Area; removal recommended
Redclaw crayfish detected at two sites, likely spreading from Lake Kariba and Kafue River
Crayfish impact fisheries and biodiversity, causing post-harvest losses estimated at US$500,000 annually
Continuous monitoring essential for early detection and management
Human Activity and River Use
Communities along the river rely on its resources for water, food, and transport, with human presence concentrated near Luangwa Town and the Zimbabwean border.
Human activity indicators show higher presence near Luangwa Town and the Hurungwe Safari Area
Most people are on the Zambian bank
Human livelihoods are directly tied to river health, emphasizing the need for targeted interventions
Conservation and Management Recommendations
Key strategies include invasive species control, water quality monitoring, biodiversity surveys, and impact assessments of mining activities.
Ongoing monitoring of invasive species and targeted removal efforts
Regular water quality assessments focusing on physiochemical parameters
Expanded wildlife surveys incorporating community data and eDNA tools
Monitoring mining impacts, including pollution and water abstraction
Emphasis on early detection and integrated management to preserve ecosystem integrity
Part of the Mana Pools UNESCO World Heritage Site
Supports high densities of large game, including over 6,000 hippos
The landscape features mahogany, wild fig, acacia, and baobab trees
Historically significant with evidence of stone age tools dating back 10,000 BC
Mana Pools became a National Park in 1975 after elephant populations were nearly extirpated in the 1800s
The natural landscape is maintained through local communities and conservation efforts
Hydrology and Water Flow Dynamics
The river's flow is heavily influenced by upstream dams, especially Lake Kariba and the Kafue River, with flow measurements indicating significant impacts from dam operations and drought conditions.
Total flow below Kariba Dam was 466 m³/s during the survey
Kafue River contributed approximately 380 m³/s, raising total flow to 849 m³/s downstream of confluence
River flow declines between sites likely due to dam releases and evaporation
Hydrological alterations affect erosion, sediment load, and aquatic biodiversity
Water Quality and Environmental Conditions
Water quality monitoring shows generally acceptable conditions but highlights issues like turbidity spikes and elevated pH linked to dam releases and natural processes.
Water quality mostly within guidelines; turbidity spikes observed
Elevated pH levels require further investigation
Specific conductivity increased after the Kafue River confluence
Water quality influenced by upstream activities, including dam operations and natural weathering
Fluctuations in river levels impact erosion and sediment dynamics
Biodiversity and Wildlife Populations
The region supports a high density of large mammals, birds, and aquatic species, with notable populations of hippos, elephants, and wetland birds, including rare sightings like Moloney’s Monkey.
6,388 large animals documented; possibly up to 6,500 hippos
Hippo density estimated at over 24 per km, stable compared to past surveys
Other large mammals: impala, buffalo, crocodiles, waterbuck, and elephants
Rare sighting of Moloney’s Monkey in a rocky gorge
Over 400 bird species, including vultures, eagles, and the southern ground-hornbill
Wetland birds like Egyptian geese and reed cormorants are abundant
Invasive Species and Ecological Threats
Invasive plants, crayfish, and other species threaten native ecosystems, with water hyacinth, spongeplant, giant milkweed, and redclaw crayfish being prominent concerns.
Invasive plants like water hyacinth and spongeplant widespread along the river
Giant milkweed found in Sapi Safari Area; removal recommended
Redclaw crayfish detected at two sites, likely spreading from Lake Kariba and Kafue River
Crayfish impact fisheries and biodiversity, causing post-harvest losses estimated at US$500,000 annually
Continuous monitoring essential for early detection and management
Human Activity and River Use
Communities along the river rely on its resources for water, food, and transport, with human presence concentrated near Luangwa Town and the Zimbabwean border.
Human activity indicators show higher presence near Luangwa Town and the Hurungwe Safari Area
Most people are on the Zambian bank
Human livelihoods are directly tied to river health, emphasizing the need for targeted interventions
Conservation and Management Recommendations
Key strategies include invasive species control, water quality monitoring, biodiversity surveys, and impact assessments of mining activities.
Ongoing monitoring of invasive species and targeted removal efforts
Regular water quality assessments focusing on physiochemical parameters
Expanded wildlife surveys incorporating community data and eDNA tools
Monitoring mining impacts, including pollution and water abstraction
Emphasis on early detection and integrated management to preserve ecosystem integrity
