Hydrologic Year

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Hydrologic Year

 

the year-long cycle of the development of hydrologic processes. Where the climate is temperate (in the USSR), October 1 or November 1 is conventionally taken as the beginning of this cycle, in contrast to the ordinary calendar year; the hydrologic winter half-year is counted from October 1 (or November 1) to March 31 (or April 30), and the summer half-year from April 1 (or May 1) to September 30 (or October 31). The hydrologic year has been introduced in order to obtain a better correspondence between runoff and precipitation, since under calendar time runoff and precipitation do not correspond to each other. Groundwater resources in most of the USSR are smaller at the end of the winter, and at this time the snow supply is substantial. Standard processing and publication of hydro-logic materials in the USSR is done by calendar years.

A. I. CHEBOTAREV

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
1: Streamflow availability rating for recharge (STARR) for the Sacramento River Basin, San Joaquin River Basin and Tulare Lake Basin during December to February (A), November to April (B) and the hydrologic year (C).
Timing is the day of the hydrologic year (DOHY) of the center of mass (COM) of flows above the 90th percentile; COM is defined by the day when 50% of the total flow volume above the 90th percentile in a given time period (e.g., winter) has passed.
For the watersheds of the 93 stream gauges analyzed by Kocis and Dahlke (2017), STARR was determined for three time periods: the hydrologic year, November to April, and December to February.
STARR shows distinct patterns for the high-magnitude flow availability in winter and during the hydrologic year (fig.
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