Geographical specificity of the river’s regime in Bulgaria

This paper presents the types of river regime based on the three characteristics and two categories. The types are isolated from the number of cases with a high water and low water phases. The subtypes were detached from the duration of a high water and low water phases. There are three types (and seven subtypes) of river regime in Bulgaria. Mildness-Continental type is with spring high water phase, summer-autumn low water phase and transitional water during winter. Continental-Mediterranean type is with winter-spring high water phase and summer-autumn phase of low flow. Transitional type is with spring-summer high water phase and increase in flow during November and December, steady low water phase from July (August) until October and with the winter low water phase.