Through experience in Kenya, one pond of 100 m2 will take 15 people about 8 days to complete, working 8 hours a day.
This will cost 15 x 8 x KShs X (X = agreed wage per day)
Ponds should be fitted with screens at inflow and outflow structures to prevent invasion by wild stock.
NB: It is always very important to consult an aquaculture farm planning and pond construction experts for assistance.
Steps in pond construction:
1. Mark out the area that the pond will occupy using wooden pegs and strings and then remove all the vegetation.
2. Remove the top soil and keep it in a good location close to the site. It will be used to cover the pond bottom and the dyke tops to enhance fertility. Remember that if the soil is kept far away, this will increase the cost of pond construction since the soil will need to be brought back
4. Establish a Temporary Bench Mark (TBM). This will allow you to determine and check by use of levelling equipment (e.g. spirit level) the elevations of the dykes, canals and other structures. The TBM should be set and permanently fixed in a protected location during the whole construction period.
5. Using level equipments (e.g. spirit level), measuring tape, pegs and strings, mark out:
- The dykes
- Dyke slopes
- Inner and outer toes
- The pond bottom
6. Using the determined pond depths and the actual elevations of the site, determine which areas need digging and which need filling. This is very important because it eliminates unnecessary movements of soil and thus keeps the construction cost at a minimum.
7. Dig out the soil from the ‘dig’ areas and place it on the ‘fill’ areas. Most of the fill areas will be on the dyke position.
8. Once the soil is placed on the fill area, make sure that this soil is properly compacted. To achieve good compaction, place soil in layers not exceeding 15 cm in height and compact back to at least 10 cm. When constructing dykes, soil layers are place 20 cm inside on top of each other to reduce amount of work during dyke cutting.