Zimar
stream has become since the 1950's a sewage drain. stream extends over
27 km from the west of Nablus City to Tulkarem City northwest of West
Bank. are lost opportunities for streams' water bene use, and nature
conservation principals have been severely violated for the Zimar
watershed, in addition to public health and biodiversity threats. paper
was prepared to predict the water quality of the Zimar's stream under
current and proposed future conditions, and under di scenarios.
Dissolved Oxygen was taken as the main quality parameter, and depending
on steady state solutions of Streeter-Phelp's equation. QUAL2Kw model
was used to predict the behavior of the stream. Water samples were
collected, and measurements were conducted for eight di critical
locations along the stream, and during the wet and dry seasons of
2011–2012. Several scenarios were simulated, taking in consideration the
in of the under-construction wastewater treatment plant in the western
area of Nablus city, proposing additional wastewater treatment plant at
Anabta village, and proposing constructing of three arti weirs. It was
found that the stream has signi self-puri capacity as the dissolved
oxygen concentration doubled from Nablus city to Anabta village; midway
to Tulkarem. Biological oxygen demand between those two points decreased
to values up to 11% from the original value. paper supports proposed
solutions of the stream to improve its water quality, and enhance
aesthetic views in the catchment.