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A method for forming a hopper in a storage structure includes mounting a form to a storage structure which bounds a compartment. The form can be flexible or rigid. A layer of cementitious material is applied over an exterior surface of the form so as to produce a rigid side wall. The rigid side wall

A method for forming a hopper in a storage structure includes mounting a form to a storage structure which bounds a compartment. The form can be flexible or rigid. A layer of cementitious material is applied over an exterior surface of the form so as to produce a rigid side wall. The rigid side wall has an interior surface bounding a progressively constricting flow channel that communicates with the compartment of the storage structure. In one embodiment, the layer of cementitious material is applied by spraying.

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1. A hopper for dispensing bulk material from a storage structure, the hopper comprising:a side wall having an interior surface that bounds a progressively constricting flow channel extending from an enlarged first end to a constricted second end, the side wall being comprised of:a flexible form;a c

1. A hopper for dispensing bulk material from a storage structure, the hopper comprising:a side wall having an interior surface that bounds a progressively constricting flow channel extending from an enlarged first end to a constricted second end, the side wall being comprised of:a flexible form;a cementitious material disposed on the flexible form; andreinforcing embedded within the cementitious material.2. A hopper as recited in claim 1, wherein the flexible form is comprised of two or more flexible panels that are secured together.3. A hopper as recited in claim 1, wherein the flexible form is comprised of a flexible sheet.4. A hopper as recited in claim 3, wherein the flexible sheet is comprised of a polymeric material, fabric, woven material, mesh, chain link, composite material, or combinations thereof.5. A hopper as recited in claim 1, wherein the interior surface inwardly curves in a convex configuration.6. A storage structure assembly comprising:a hopper as recited in claim 1;a storage structure bounding a compartment, the enlarged first end of the hopper being secured to the storage structure so that the flow channel communicates with the compartment; anda bulky feeder coupled with the constricted second end of the hopper.7. A storage structure assembly as recited in claim 6, further comprising a tubular conduit extending between the constricted second end of the hopper and the bulky feeder.8. A storage structure assembly as recited in claim 6, further comprising a support member mounted to the storage structure, the support member being comprised of a cementitious material and be integrally formed with the first end of the hopper so as to support the hopper.9. A hopper as recited in claim 3, wherein the flexible sheet is comprised of a cross laminated plastic or a reinforced plastic coated fabric.10. A hopper as recited in claim 1, wherein the flexible form has an exterior surface on which the cementitious material is disposed and an interior surface which bounds the flow channel.11. A hopper as recited in claim 10, wherein the interior surface of the flexible form and the exterior surface of the flexible form have complementary configurations.12. A hopper as recited in claim 10, wherein the interior surface of the flexible form and the exterior surface of the flexible form each have a substantially frustoconical configuration.13. A hopper as recited in claim 10, wherein the interior surface of the flexible form and the exterior surface of the flexible form each have a substantially hyperbolic curvature.14. A hopper as recited in claim 10, wherein the cementitious material comprises a sprayable concrete that has been sprayed onto the flexible form in multiple layers.15. A hopper as recited in claim 10, wherein the flow channel bounded by the flexible form has a volume greater than 5 cubic meters.16. A hopper as recited in claim 10, wherein the flow channel bounded by the flexible form has a volume greater than 40 cubic meters.17. A storage structure assembly as recited in claim 6, wherein the flexible form is secured directly to the storage structure.18. A storage structure assembly as recited in claim 7, wherein flexible form is secured directly to the tubular conduit and the cementitious material is disposed on the flexible form and at least a portion of the tubular conduit.19. A storage structure assembly as recited in claim 6, wherein the bulky feed communicates through a side of the storage structure.