Alligator Lake is one of four salt water lakes through which the Suez Canal passes in the north-east of Egypt (the lakes in order from North to South are: Manzala Lake, Alligator Lake, Great Bitter Lake and little bitter lake), most of the lake is shallow, no more than one meter deep, and its area is about 14 km2.
Geography
Many beaches overlook the lake, including the Muslim Youth Beach, Turquoise Beach, Navigation Beach, Sea Beach, Cooperation Beach, and a few beaches of the Suez Canal Authority.
History
The first canal that passed through the lake was the one dug during the reign of King Senusret III in the Middle Kingdom, approximately 4000 years ago, known as the Sesostris Canal. It was re-dug and expanded multiple times, including in 600 BC. During the reign of King Nacho II, its last excavation was conducted on the days of the Abbasid caliph Al-Mansur.
In November 1854, the French politician Ferdinand de Lespes received a firman from the Khedive allowing him to dig the Suez Canal to also pass through the lake, and in 1862, the lake was filled with the waters of the Red Sea and became part of the Suez Canal.
Ecological characteristics of the lake
Crocodile Lake is considered a brackish lake; however, it suffers from significant differences in salinity ratios. Human engineering projects have affected the salinity of the lake, which has led to changes in the biological life of the lake, as with other construction projects.
The Gemayel outlet is the main source of saltwater in the Crocodile Lake. The main source of fresh water in the lake was the annual flooding of the Nile until the construction of the High Dam in Aswan and the interruption of the flood in 1966, and although groundwater also accounts for much of the lake's fresh water supply, Crocodile Lake suffers from stratified variations in salinity degrees, seasonal surface changes in salinity, and recent decades, the varieties of organisms living in fresh water in the lake have exceeded those varieties living in brackish water.
Pollution
Crocodile Lake suffers from remarkably high rates of water pollution, which makes its waters very dangerous to human health, even becoming unfit for swimming due to the severe pollution resulting from the disposal of sewage, agricultural and industrial without treatment, including pesticides, chemicals, hormones in the navigation of the Suez Canal, and in the bitter, Manzala and crocodile lakes, which are the main sources of fishing, which led to a decrease in fish wealth in addition to the waste of 3 million cubic meters of water per day.
The Egyptian General Authority for drainage projects in Ismailia monitored a statement of the banks that receive their waste in the waters of the lakes and the Suez Canal, which amounted to about 20 banks, including: 10 banks flowing into the navigable course of the Suez Canal, 3 banks flowing into the Crocodile Lake, and 7 banks flowing into the bitter and Manzala lakes.
A recent report by the joint laboratory in Ismailia also revealed the existence of non-final dual-treatment wastewater treatment plants in the governorate, which prohibit the use of water resulting from them for irrigation of fruit trees, including: the serapium treatment plant, which pours into the AL-mahsama Bank, which ends at the fishermen's Lake and from there to the Crocodile Lake.
In 2002, a study was conducted to check the concentrations of polycyclic aromatic hydrocarbons (PAHs) in fish and shellfish species consumed by residents from the lake. The samples included cichlids, crabs, bivalves, oysters, and gastropods. The results showed that crabs contained " significantly higher concentrations of total and carcinogenic polycyclic aromatic hydrocarbons compared to other species, while oysters contained significantly lower levels of polycyclic aromatic hydrocarbons.
In 2003, a number of community bodies tried to mitigate the pollution of the lake, and it was an important event for the local community, as the lake is of economic importance for the city and for its fishermen.