WSE3701
Assignment 2
Exceptional Analysis
Due 16 July 2025
,WSE3701
Assessment 2: Comprehensive Analysis
Due date: 16 July 2025
Design of a Sustainable Sewered Sanitation System for 200 Houses in Lepelle
Nkumpi Local Municipality: A Water and Sanitation Engineering Solution
, Site Selection and Problem Identification
The Lepelle Nkumpi Local Municipality in Limpopo, South Africa, faces significant
sanitation challenges, with existing facilities in deplorable condition and pollution from
agrochemicals, waste systems, mining, sewerage, and industrial effluence affecting
sanitation systems. Poor sanitation contributes to waterborne infections, impacting
residents' health. This rural area, with a population density suitable for 200 houses,
presents an opportunity for a comprehensive sanitation redesign to address these
issues.
Sanitation Solution and Design Approach
For 200 houses, a sewered system is proposed, given the assessment's focus on
designing sewage collection and conveyance systems. The design includes:
• Sewage Collection System: A grid layout with collector pipes for each block of 20
houses, connecting to main sewers leading to the treatment plant.
• Treatment Method: Oxidation ponds, suitable for rural settings, with a rough
estimate of 3,000 m² area and 1.5 m depth, based on a 25-day retention time for
an average daily flow of 180,000 L/day.
• Hydraulic Analysis: Using SANS 10252-2, average flow is 900 L/day per 3-
bedroom house, with a peak factor of 2.5 for maximum daily flow, and peak dry
weather flow (PDWF) calculated at approximately 9.79 L/s for the entire system,
ensuring minimum velocities for self-cleaning.
Environmental and Sustainability Considerations
The design assesses impacts on local water resources, proposing oxidation ponds to
minimize groundwater contamination. Solutions align with public health requirements,
ensuring treated effluent meets standards like SANS 241, and include
recommendations for long-term maintenance to prevent environmental degradation.
Assignment 2
Exceptional Analysis
Due 16 July 2025
,WSE3701
Assessment 2: Comprehensive Analysis
Due date: 16 July 2025
Design of a Sustainable Sewered Sanitation System for 200 Houses in Lepelle
Nkumpi Local Municipality: A Water and Sanitation Engineering Solution
, Site Selection and Problem Identification
The Lepelle Nkumpi Local Municipality in Limpopo, South Africa, faces significant
sanitation challenges, with existing facilities in deplorable condition and pollution from
agrochemicals, waste systems, mining, sewerage, and industrial effluence affecting
sanitation systems. Poor sanitation contributes to waterborne infections, impacting
residents' health. This rural area, with a population density suitable for 200 houses,
presents an opportunity for a comprehensive sanitation redesign to address these
issues.
Sanitation Solution and Design Approach
For 200 houses, a sewered system is proposed, given the assessment's focus on
designing sewage collection and conveyance systems. The design includes:
• Sewage Collection System: A grid layout with collector pipes for each block of 20
houses, connecting to main sewers leading to the treatment plant.
• Treatment Method: Oxidation ponds, suitable for rural settings, with a rough
estimate of 3,000 m² area and 1.5 m depth, based on a 25-day retention time for
an average daily flow of 180,000 L/day.
• Hydraulic Analysis: Using SANS 10252-2, average flow is 900 L/day per 3-
bedroom house, with a peak factor of 2.5 for maximum daily flow, and peak dry
weather flow (PDWF) calculated at approximately 9.79 L/s for the entire system,
ensuring minimum velocities for self-cleaning.
Environmental and Sustainability Considerations
The design assesses impacts on local water resources, proposing oxidation ponds to
minimize groundwater contamination. Solutions align with public health requirements,
ensuring treated effluent meets standards like SANS 241, and include
recommendations for long-term maintenance to prevent environmental degradation.
