Keywords: Mahmoudia canal, oxygen sag curve, dissolved oxygen deficit, natural self–purification, Egypt, water self–restoration, drainage discharge, water quality, simulation, water reuse
Prediction and evaluation of natural self–restoration of the water of Mahmoudiya canal, western part of Nile Delta, Egypt
The objectives of this paper are to study the effect of discharge of Zarqun drain into Mahmoudiya canal on the natural self–purification along the canal stream and to suggest and simulate different scenarios to improve the water quality of the Mahmoudia canal system to safely discharge water of Zarqun drain into it. Natural self–purification model based on oxygen sag curve introduced by Streeter and Phelps has been applied in two cases; the first is the current situation case, where no drainage water is discharging into the canal because of Edko Irrigation Pumping Station stops lifting drainage water from Zarqundrain into the canal. The second case provides additional safe reuse water through lifting drainage water from Zarqundrain into the canal using Edko Irrigation Pumping Station. The result of this case will determine the required canal length to achieve self–purification. Different scenarios will be designed to simulate different conditions of the water quality system improvement. The best scenario has been stated and detailed and recommendations have been done.