Results, calculations, and assumptions of the WASH sector in GAMA – GTG Webinar – March 10th 2016

GAMA Technical Group Meeting Report


  1. The debut of the prototype WASH sector model will be during the second half of June 2016.  We will be holding select sub-group results workshops with key institutions before the main event.  The objectives for the debut are:
  • Model is functional and has benefits for urban planning, policy and decision-making in GAMA
  • There is municipal interest in using WASH findings for decision making
  • There is a strong desire to expand the model development to full city scale incorporating all sectors

  1. Ghana was well represented by MLGRD, AMA, TMA at the UNSDSN Thematic Network 09 Workshop at Rockefeller Foundation Bellagio Centre March 2-4th.  The outcome of the conference was the Roadmap 2030 document which is currently out for your consultation, review and amend.  The aim of the Roadmap 2030 is to provide a practical, step by step action plan to support the World Urban Campaign and Habitat III process, that will show how municipal and city governments, citizens, civil society and the private sector can work in partnership, at the required speed and effectiveness, to mobilise the finance and expertise to deliver sustainable development objectives in urban areas and build the New Urban Agenda. It also provides an action plan for National Governments to create the enabling environment for the plan to succeed.


  1. GCF Readiness Funding proposal to develop proposal to continuation of model is being developed with MLGRD, AMA, TMA and AfDB.

Activities this month

  • Developing communications and media engagement in the run up to the June debut with  Daily Graphic and Ghanaian Times, radio and television – watch this space!
  • 121 meetings with technical staff at MMA level – water and sanitation directorate, budget and planning offices.

Modelling update by the ICL/IIER team in London

We are developing a simulation of the GAMA population to examine WASH demand now and in the future.  There are two steps in the model to 1) Simulate 2) Optimize infrastructure


The GTG discussed the level of confidence in the prototype modelling assumptions


Among others looking at:

  • Average water demand per low, middle and high income household
  • Impact of water rationing on % reduction in use
  • Waste water generation as a % of residential use
  • Assumed pipe leaks 27% flow
  • Upper bound on flows (Qmax) ~1800m3/ha

Calculation method:

  1. Characterise population by socio-economic characteristics
  2. Estimation of water use based on time dependent activities
  3. Multiply across the population
  4. Set desired objectives to meet demand and achieve waste water treatment at lowest cost and emissions
  5. Calculate how to meet demand based on existing infrastructure, cost of electricity, labour, new pipes and treatment infrastructure etc., and how to link districts most effectively

We shared the results from:

  1. Total residential demand profile per MMDA over 24 hrs.
  2. Drinking water demand profile per MMDA over 24 hrs and annually

The model will minimize aggregated CAPEX-OPEX and CO2 emissions WHILE meeting demands.


E.g. Optimal flows on potable water in thousands of m3 per district


E.g. Optimal flows on waste water in thousands of m3 per district

Toilet use and waste produced per district over a 24 hour period has also been calculated

Presentation by Eric K Afornorpe, MLGRD

Presentation of the level of WASH facilities in GAMA and challenges ahead in planning for the increasingly urbanised population.  The model has taken account of increasing complexity and used all available data.  The approach will reduce human errors and ease projection of WASH requirements for long term economic scenarios.  The following organisations have inputted to the model development MLGRD, MWRWH, MESTI, CERGIS, GWC, GRCC, MMDAs.


Despite the National Environmental Sanitation Policy 2009; National environmental sanitation action and investment plan and National urban policy 2012, the Accra Sewerage Improve Project, WB GH Ghana sanitation and water project, DANIDA sludge treatment project and Bolah-Bondeh project challenges in this sector remain.

Presentation by Dr George Rockson, Director of Research, Zoomlion helps to use integrated and appropriate knowledge and information for informed planning which is essential for effective delivery of holistic WASH systems:


Key messages:

  • Zoomlion will be able to use the model to better evaluate resilient initiatives and work in PPP to deliver new mobile and fixed toilet facilities and new waste treatment plants around GAMA.  
  • Knowledge sharing is crucial as Ghana seeks to improve resilience and the approach will permit Ghanaians to utilize their established knowledge institutions for long term benefit.
  • The private sector will play a major role in the timely achievement of the SDGs for Ghana to 2030 and access to this data and information will accelerate this role.

Enthusiastic discussion was had around the table throughout the meeting.  

Date of next meeting

Thursday 12th May 2016, 11:00- 12:30 at the Large Conference Room at the German Development Corporation House, Airport Residential Area, 7th Volta Street, Accra.


Webinar slides download – pdf


Webinar audio download – mp3