Pump with precast concrete dual volute

A method of providing a dual channel concrete CVP volute at an application site, the method comprising:

• pre-casting, at a location that is remote from the application site, a concrete volute upper portion comprising a top panel, a sidewall, and a cutwater, the sidewall and cutwater being joined at upper edges thereof to the top panel, the sidewall and cutwater extending downward from the top panel and forming, in combination, an impeller chamber and two volute channels extending from opposing sides of the impeller chamber to a volute outlet;
• locating, at the application site, a concrete volute base comprising a cutwater recess into which a lower edge of the cutwater extends when the volute upper portion is placed onto the volute base and sealed thereto, the cutwater recess comprising cutwater recess sides that provide lateral support and bracing to the lower edge of the cutwater;
• transporting the precast volute upper portion to the application site;
• placing the volute upper portion onto the volute base at the application site, such that the lower edge of the cutwater of the volute upper portion extends into the cutwater recess provided in the volute base;
• and sealing the volute upper portion to the volute base, the cutwater recess sides of the cutwater recess thereby providing lateral support and bracing to the lower edge of the cutwater, wherein locating the concrete volute base comprises casting a slab of concrete and forming the cutwater recess into the slab of concrete at the application site, thereby forming the concrete volute base.