Question

write about cleanliness of wells​

Answer 1

Question

write about cleanliness of wells​ .

Answer

1) Protect the top

Build a wall around the top of the well, with a reinforced concrete drainage apron around it. This will prevent surface water running into the well; particularly important where there are animal droppings around.

2) Cover it

install a reinforced concrete cover over the top of the well to keep anything from falling in and polluting the water.

3Inventory of existing wells

The disaster may have contaminated

or damaged a large number of wells.

The first step must be to select which

wells should be repaired first.

Answer 2

Answer:

The outlines of a four-step

approach to cleaning and disinfecting

wells after natural or man-made

disasters. It is an emergency

approach designed to rehabilitate

wells so that they produce water of a

similar quality to that supplied before

the disaster (see Box 1.1). Technical

Note 15 gives further information on

wells contaminated by seawater.

Explanation:

Rehabilitation and

cleaning of wells

The amount of rehabilitation and

cleaning required will depend on the

amount of damage caused by the

disaster. Typically it will include the

following steps:

1. Remove and repair/replace the

pumping mechanism or lifting

device.

2. Remove polluted water and

debris from the well using either

buckets or pumps. Special care

must be taken when using a

pump to remove water from wells

contaminated with seawater.

3. Repair/reline the well walls to

reduce sub-surface contamination.

4. Clean the well lining using a brush

and chlorinated water

5. Place a 150mm layer of gravel in

the base of the well to protect it

from disturbance.

6. Seal the top of the well using a

clay sanitary seal.

7. Construct a drainage apron and

head wall around the well to

prevent surface water, insects and

rodents from entering the well.

Provide a cover for the well.