* Create an abstraction point.
* Fill the remaining volume with sand.
* Add a coarse mesh after the silt trap before inlet to prevent large debris from entering the tank.
====Tank modifications and maintenance====
* In case of cracked linings, the following could be tried to salvage the tanks:
**If the crack is only at the base, covering the tank base with clay and compacting it might work. Addition of powdered anthills or lime is said to make this lining more robust. If the cracks are also found in the walls, then rehabilitation or an alternative lining might be a solution. Taking the example of berkeds in Somaliland, many remain unused due to previous poor workmanship, yet rehabilitation is expensive ($8 per m3), requires skill and is not always successful. In some cases it is also not even possible to rehabilitate – some cracked berkeds can be rehabilitated if the original walls were made solidly enough, but otherwise there are many berkeds that can never be rehabilitated. In such cases, plastic linings might be worth trying.
====Tank modifications and maintenance====
* Add a coarse mesh after the silt trap before inlet to prevent large debris from entering the tank.
* Where catchments have low runoff coefficients, this can be increased by modifying the existing surface or creating an artificial surface:
# In China, soils with reasonable infiltration capacity had a runoff coefficient of 2%, which was increased to 20% after the soil was compacted.