Water Climate Tool From Meteo-RwandaName of location (approximately): Rwamagana, RwandaLatitude: -1.95141 (decimal degrees)Longitude: 30.43093 (decimal degrees)Altitude: (m above mean sea level)

Average precipitation (in mm or liter per m) for this location is listed in the table below.MonthRainfall(mm)

1January78

2February92

3March124

4April164

5May99

6June16

7July7

8August28

9September64

10October87

11November130

12December97

Year983mm

Fig. Rainfall Hyetograph for Rwamagana station

So according to the data we have and the rainfall intensity obtained from metheo-website then, total rainwater is calculated by using Rational formula. We assume that the total area is to be equal to 40% percent of the total catchment area, then here we calculated the area for each categories of industry. The following table helped us to select the runoff coefficient over roof surface.

Water distribution According to the industries that we have in our country, we categorized industry according to the daily water consumption ,We concluded that: All these industries consumes great than one hundred cubic meter day (100m3 /day) are classified into large industries. All these industries consumes great than forty cubic meter day (40m3 /day) are classified into to medium industries. All these industries consumes less than forty cubic meter day (40m3 /day) are classified into to medium industries.