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Climate Resilient City Wide Inclusive Sanitation Plan, Mozambique

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Climate Resilient City Wide Inclusive Sanitation Plan, Mozambique

Introduction

The four municipalities—Mocuba, Angoche, Alto Molocue, and Namialo—span diverse landscapes across Zambezia and Nampula provinces, covering mixed coastal, riverine, and inland geographies. Together, these towns host more than 300,000 residents, with varying densities shaped by agriculture, fishing, trade, and expanding peri-urban growth. Annual rainfall ranges between 1,100–1,300 mm, and temperatures often exceed 29–35°C, creating conditions that heavily influence sanitation performance.

All four towns rely predominantly on on-site sanitation, with 62–81% of households using individual latrines, while open defecation persists in vulnerable pockets. Flooding, waterlogging, and proximity to rivers or wetlands affect up to 12–27% of buildings, causing regular containment failures and environmental contamination. Economically vulnerable settlements—representing 70–87% of the population—are often located in these high-risk clusters, increasing health and service-access disparities. These challenges highlight the need for climate-responsive planning to ensure safe, equitable sanitation across all four municipalities.

Project Info

Client

USAID / SNV / N’weti / CESC / Planet Partnerships

Date

2023–2025

Location

Mocuba, Angoche, Alto Molocue & Namialo, Mozambique

Scope

The project focuses on developing a coordinated CWIS Plan for the four towns by assessing existing sanitation conditions, identifying risk-prone settlements, and proposing safe, climate-resilient containment solutions. The work includes analysing desludging access, strengthening conveyance infrastructure, evaluating and upgrading FSTPs, and designing suitable greywater management systems.

The initiative integrates spatial analysis, risk modelling, and water-sensitive strategies to guide regulatory improvements, service delivery mechanisms, and financial planning. Its objective is to build resilient, inclusive sanitation systems that address environmental vulnerabilities while remaining feasible for municipal implementation.

Did You Know?

  • Cyclone Freddy (2023) disrupted sanitation services across the region, damaging water points and heightening cholera risks.
  • Angoche and Mocuba have the highest percentage of buildings in flood or waterlogging zones, increasing containment failures.
  • Alto Molocue records up to 16% open defecation, one of the highest levels among the studied towns.

Services Delivered

Comprehensive Solution

A robust GIS-based assessment was conducted across all towns, integrating building footprints, risk layers, drainage networks, and economic vulnerability mapping to produce accurate, actionable sanitation profiles.

Flood Modelling and Risk Mitigation

Risk modelling incorporated elevation, slope, precipitation, waterbody proximity, and drainage density to identify areas vulnerable to flooding and waterlogging. These insights informed safe containment recommendations and resilient infrastructure placement.

Wastewater Management Expertise

Town-wide wastewater assessments guided improvements to existing containment, desludging systems, and FSTP operations. Recommendations highlighted safe treatment pathways and strengthened conveyance chains to reduce environmental contamination.

Greywater Management as Pilot Solutions

Greywater catchments were delineated using watershed and density patterns. Pilot Dry Weather Flow Interceptor (DWFI) systems were proposed in high-density neighbourhoods to intercept and treat polluted greywater before discharge.

Cost Estimates and Phased Plans

Structured investment plans outline phased implementation—from containment upgrades to desludging improvements and treatment expansion—ensuring financial feasibility and operational readiness.

Regulatory Reform Recommendations

Actionable regulatory reforms were recommended to improve municipal by-laws, desludging service rules, tariff structures, and monitoring systems, helping strengthen long-term sanitation governance.

Work Illustration

A multi-parameter vulnerability assessment—evaluating elevation, drainage density, flood exposure, waterbody proximity, and settlement accessibility—revealed that 9–12% of buildings across the towns fall within high-risk flooding or waterlogging zones. These areas frequently experience toilet backflow, collapsed pits, and greywater stagnation.

The geospatial analysis also showed significant risk overlap within economically vulnerable settlements, where containment failures and desludging limitations compound public health risks. These findings informed the prioritisation of settlement clusters for immediate interventions, forming a core component of the Mozambique four-town CWIS planning framework.