The IUWM diagnostic phase includes:
- Data analysis and harmonization;
- Water supply, wastewater and solid waste systems analysis;
- Institutional framework analysis;
- Environmental analysis;
- Project web portal implementation;
- Topographic analysis;
- GIS implementation.
Marondera relies on raw water supplied by dams, two of which are owned by ZINWA (Rufaro and Wenimbi) while the other two are owned by the Municipality (Nyambuya and Nyakambiri – the last one decommissioned). All dams are located at a lower elevation than the town, therefore all the water needs to be pumped.
The occasional use of boreholes and shallow wells is a strong indicator of the unsustainability of underground water as a reliable source of drinking water for the town.
The existing water treatment plant (WTP) has an average capacity of 13,500 m3/d, although it is currently treating only about 8,600 m3/d due to plant and pumping limitations. Apart from the aged infrastructure, the intermittent power supply is one of the main causes limiting the production, treatment, pumping and distribution capability of the plant.
The main shortcomings of the WATER SUPPLY SYSTEM are:
– Most of the pumps do not work properly, causing frequent breaks and energy waste;
– No “inverter” is installed at the pumping stations;
– Most of the air valves along the main pipes are leaking;
– The pipes and fittings are subject to frequent burst;
– Major pipe bursts and air valve leaks are mostly due to “water hammer”;
– No flow or pressure meters are in place at the Pumping Stations.
– The WATER TREATMENT PLANT units that provide the preliminary and final disinfection processes are not functioning in a proper way due to their poor condition;
– One of the dosing systems ;
– the filtration process is not working efficiently;
– Only two of the dry well pumps are connected and operating, the third one is out of order
The main shortcomings of the WATER DISTRIBUTION SYSTEM are:
– high percentage of leakage;
– many components are underdimensioned, while others are overexploited and damaged;
– Frequent contamination ;
– Frequent wear and tear on valves, water meters malfunction;
– High capital cost of making the system stronger compared to a continuous water supply system;
– Often, no immediate supply and pressure is available in case of fire.
The SEWER NETWORK is suffering from overloading and lack of maintenance.
Most part of the major wastewater line is in very bad conditions : many trunks are either broken, missing or clogged.
The elevation and morphology of the study area mean that:
– the sewage of the northern part of Marondera flows by gravity towards Rufaro lake, one of the main raw water sources for Marondera;
– the southern part of Marondera flows to Elmswood ponds.
The pumping stations are not working.
– Elmswood wastewater treatment ponds can be used but they need some cleaning with heavy equipment. The inlet works need to be fixed.
– In the late 90’s, a 4,000 m³/d capacity BNR sewage treatment plant was undergoing construction in Rufaro in order to treat the sewers discharging into the lake but was later abandoned, when almost completed, due to lack of funds.
The coverage of solid waste collection through door-to-door collection is very high at 90% whilst about 60% of the generated solid waste in the town is collected. The rest is either burnt at source or disposed in undesignated areas in the town.
The solid waste collected is dumped in a wooded area about 8 km from the town centre.
There is no separation of the waste.