Global Surface Water Source.

A surface water source includes all tributary streams and rivers, natural lakes and artificial reservoirs or impound.

1. Quantity of Water

The quantity of water at the source shall be:

• Adequate to supply the treatment of water demand of the town or city.

• Reasonable surplus for anticipated growth over a design period of 20 to 30 years.

• Adequate to compensate for all losses.

• Evaluated for quantity of treatment water dependability during drought.

• Evaluated for impacts on downstream uses due to abstraction for the project.

2. Quality of Water

A sanitary survey and study should be made of factors, both natural and man made, which will affect quality. such survey and study shall include, but shall not be limited to:

• Obtaining samples over a sufficient period of times to assess the biological, physical, chemical and radiological characteristics of the treatment water.

• Assessing degree of hazard to the supply from upstream discharges and by accidental spillage of materials that may be toxic, harmful or detrimental to water  treatment process.