How to convert patio under the deck into a she shed?

The patio floor to deck is 8-9 ft. We just had the deck replaced with cedar. The patio underneath deck is open on 2 sides. I want to convert it to a 'She-shed' but worry about things getting wet when it rains/ snows, from the deck flooring. The floor is concrete but some water pools on one side when it rains or when I use the hose. I'm open to suggestions. Thanks.

New wrap around deck. Under that is the patio.

The left side patio is where I plan a project.

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