The bar chart compares length of water quality by dividing into 3 different categories (good, fair and poor) in rivers in England from 1993 to 2003. Units are measured in 1000s km.
Overall, rivers with all 3 quality types of water were fluctuated throughout the period and good quality water had rose in contrast other two which were reduced. Although starting of the period all categories were close to each other, between 9 and 12, the last year they were very distinct.
Beginning of the decade good and fair quality water’s length were almost the same 12 and 12.5 respectively. Throughout the period length of rivers with good water saw an upward trend with a fluctuation and rose to 21. Though, fair water rivers’ length went up minimally rose to 12.5, between 1993 and 1996, next 7 years this trend changed to revers fell by 4, at 9.
Length of poor quality rivers was the lowest over the given period. In 1993, this indicator was at its peak at 9.5 and next 3 years it saw five times decrease. From 1996 to 1998, this trend climbed sharply and reached to 4.5, since reminding years’, until 2002, dipped moderately low of 2. The last year the trend doubled that of in 2002.