Grouping of wastewater discharges from three population centres in El Saucejo, Seville

The municipality of El Saucejo is made up of three population centres: El Saucejo as the main town, the village of Navarredonda and La Mezquitilla. The works to combine the wastewater discharges are divided into two actions: the first concentrates the discharges from El Saucejo and Navarredonda up to the El Saucejo WWTP. The second independently covers the discharges from the small village of La Mezquitilla and reaches the La Mezquitilla WWTP.

The new pipe is divided into sections called shafts:

- Saucejo Shaft 0: It is 39,386 metres long and collects the flow of the new SAU-0 discharge point, which runs along the road located to the north of the riverbed where SAU-1 discharges. For the grouping of this discharge, a new section of pipe will be built from the existing well in the current pipeline to the spillway planned at the start of the Saucejo 1 shaft.
- Saucejo Shaft 1. It measures 1,384.019 m and along its route it incorporates the discharges of the pipes from the SAU-2 (k.p. 633+359) and NAV-1 (k.p. 1+024.068) discharge points, in addition to the SAU-0 discharge point (k.p. 000+000). 

- Saucejo 2 Shaft: It originates at discharge point SAU-2 and collects the discharges from part of the centre of El Saucejo. Its 266.640 m run parallel to a stream tributary to the La Parra river until it connects with the Saucejo 1 shaft. 
- Navarredonda Shaft: It starts at an existing well in the current pipe network in the town of Navarredonda, where a spillway is planned to evacuate the flow of rainwater. The first section of the pipe is fitted between the houses of the village and the Navarredonda stream, then its route enters the centre before passing along a rural road in its last section and incorporating its discharges into the Saucejo 1 shaft. 
- Mezquitilla Shaft: The Mezquitilla shaft is independent of the pipes described above, due to the isolated location of this small town. It starts at an existing well in the pipe that discharges at discharge point MEZ-1 and, after relieving the rainwater flow, it flows by gravity along a rural road to the La Mezquitilla WWTP. Its total length is 25.60 m.