TESTING THE HOMOGENEITY OF RAINFALL RECORDS FOR SOME STATIONS IN IRAQ

In this study three homogeneity tests were used: Pe ttitt, Buishand and double mass curve tests. These tests were applied to thirteen Iraqi stations of monthly rainfall observations: Mosul, Kirkuk, Khanaqin, Ramadi, Baghdad, Karbala, Hilla, Najaf, Diwaniya, Samawa,Nasiriyah, Amara and Basrah for the period (1970-2010) for all stati ons except Ramadi (1981-2010) and Hilla (1980- 2010). Pettitt test indicated that there was no bre ak point at any station, while Buishand test indicated that there was a break point only in Karbala station on March-1998 and double mass curve indicated that there was a break point at Karbala on March-19 98 station and Samawstation on December-1991 so, they were corrected with double mass curve and retested by each of Pettitt and Buishand tests and they showed no break point.