#In Somaliland it cost between $39 - $43 per m3 of storage for a new berked and $8 per per m3 for a rehabilitated berked, excluding about 30-45% of local contribution (e.g. 493m3 new berked = $19,550; rehabilitated existing berked = 4,000 USD). In India, stone masonry sub-surface tanks cost $28 per m3 of storage (35m3 tank cost $990). <br>
#Floor to be made from concrete which needs to be laid with vibration in order to be sure they are leak-proof.
#In clay areas, be sure to build the tank robustly enough to resist cracking. Sample dimensions & mixtures for walls and floor for stone masonry tanks in an area of swelling clay are: '''Walls''': 0.4m wide, 2 blocks thick. '''Floor leveling mixture''': 0.05m thick, ratio 1:4:6 (not used in rehabilitated berkeds as level floor foundation already exists). '''Floor''': 0.16m thick, unreinforced concrete, ratio 1:21⁄2:4.* Bricks/cement:#In Kenya, brick/cement tanks cost $37 per m of storage (21m3 tank cost $780).#In Sri Lanka, brick tanks cost 28 per m3 of storage (5m3 tank cost $140).#In clay areas, be sure to build the tank robustly enough to resist cracking.* Ferrocement:#Ferrocement tanks in other areas seem to cost in the range of US$30.5 (60m3 tank cost US$1,830) to US$32 per m3 storage (60m3 tank cost US$1,900) including all costs.* Anthill/lime/cement – in Kenya, anthill material and lime has been added to reduce cost of lining. The lower capitalcost though does mean more maintenance work. However there does not seem to be too much field data on how these function in the longer term.#The following plaster mixture proved to work better: 4 parts anthill soil, 1 part cement, 2 parts lime, 6 parts river sand.* Plastic/rubber:#Choosing a plastic/rubber lining is not an option in most circumstances due to combinations of fragility, expense and feasibility for welding together sheets for larger ponds. Below the pros and cons of various liners are discussed: #There are five main types of liner constructions: Polyethylene, Polythylene, PVC liners, EPDM/rubber, and polypropylene. As an indication of costs, an EPDM/rubber sourced in the UK is around $6.5 per square metre not including shipping costs. Choice of lining needs further consideration: • Needs to be food grade since the water it stores is for drinking. • Cost: Polyethylene and Polythylene liners typically cost half that of Polypropylene and EPDM. PVC and PVC-E liners are the next step up from Polyethylene and polyethylene in terms of cost. Compared to other liners, PVC is somewhat more affordable, while being somewhat puncture resistant at the same time but in terms of durability, the typical 20-mil (i.e. 0.020") thick PVC is somewhat mediocre in terms of durability. EPDM is more expensive than Polyethylene, polyethylene, and PVC liners, but can last for up to 20 years. Polypropylene is an expensive material but can last for up to 40 years.
