Hydraulic ram pumps and Sling Pumps

OP-32-EAnnex 1: Example of tariff calculation for a handpump (flat rate)a) Brief descriptionIn this example, the handpump can reach a depth of between 15-45 m. Water delivery yield is 0.30 l/sand the handpump is used by a rural community of 250 inhabitants. The majority of beneficiaries arepoor and they have a water committee to manage the service. The handpump is operated by users andmaintained by a caretaker. When necessary, the water committee hires a mechanic to perform majorrepairs.The costs are the following: Investment costs include construction costs, equipment, tools, spare partsand the drilling of the well. The main parts of the handpump are the cylinder, plunger, footvalve andpumping head (construction costs). All of these parts have a life cycle of about 10 years with propermaintenance. The equipment, tools and spare parts include: buckets, broom, brush, lubricator, spanner,screwdriver, wrench, knife, pipe threader, tackle, trowel. These tools have to be replaced every year. Aprivate contractor does the drilling of the well.Investment cost for a deep well handpumpType of costValue in US$Construction costs 2000Equipment, tools and spare parts 500Drilling 1000Total investment costs cost 3500Recurrent costs include the maintenance of the handpump and the administrative tasks for themanagement of the system. The former includes payment of caretaker wages, the purchase of tools(bucket, spanners, wrench, trowel, screwdriver, etc), materials (grease, paint, uniform, gravel sand,cement) and spare parts (nuts, bolts, cupseals, bearings, main tubing, threads, pipe threads), andpayments for a mechanic to perform major repairs. Once a year a private contractor does amaintenance service on the well to keep it functioning in a proper manner. The treasurer of the watercommittee manages the system. He does not receive a salary, but receive a commission. Expenditureon administrative tasks is low because bills are written by the treasurer on a simple sheet and hecollects the money at his home. The treasurer delivers bills at the handpump site and does thebookkeeping every week. The total time the treasurer allocates to the system is four hours every day.Recurrent cost for one yearType of costValueMaintenanceWage (caretaker) 150Tools 10Materials 40Spare parts 100Mechanic (big repairs) 150Private contractors (maintenance of the well) 50Total Maintenance 500ManagementCommission (treasurer) 100Paper 50Unforeseen expenses 50Total Management 200Total recurrent cost 700Future investment costs. In order to increase the capacity of the system for the growing number ofusers, an additional well will need to be drilled in ten years time. The main parts of the well willrequire replacement, also in ten years.52