Category: water

Chemical Oxygen Demand (C.O.D) And Their Test

Chemical Oxygen Demand (C.O.D) The amount of oxygen required to carry out the chemical decomposition of organic matters in sewage is known as chemical oxygen demand (C.O.D).  It indicates the amount of biologically active as well as biologically inactive organic matter present in the sewage. In general, chemical oxygen demand(C.O.D) of sewage is higher than Biochemical … Continue reading Chemical Oxygen Demand (C.O.D) And Their Test

Effect of Impurities in Water on Properties of Concrete

Effect of Impurities in Water on Properties of Concrete

Effect of Impurities in Water on Properties of Concrete The impurities in water used for the preparation of concrete may affect the properties of concrete in the following way:   a) The strength & durability of concrete may be reduced due to the presence of impurities in the mixing water. Experiments show that water containing an … Continue reading Effect of Impurities in Water on Properties of Concrete

What is Sanitary and Storm Sewage, Dry And Wet Weather Flow

Sanitary Sewage Sanitary sewage includes liquid wastes of domestic and industrial places.  Storm Sewage Storm sewage includes surface runoff developed during and immediately after the rainfall over the concerned area. Dry Weather Flow(D.W.F) The sanitary sewage which flows in dry season is known as dry weather flow.It consists of two types of sewage:a) Domestic sewage.b) Industrial … Continue reading What is Sanitary and Storm Sewage, Dry And Wet Weather Flow

What is Infiltration – Infiltration Rate and Capacity

WHAT IS  INFILTRATION When water falls on a given formation, a small part of it is, first of all, absorbed by the top thin layer of soil, so as to replenish the soil moisture deficiency. Thereafter, any excess water moves downward where it is trapped in the voids and becomes groundwater. This process, whereby, water enters … Continue reading What is Infiltration – Infiltration Rate and Capacity