8 Supplies for Harvesting and Storing Rainwater at Home

Watching hundreds of gallons of clean rain run down the driveway during a sudden downpour is painful when gardens are parched. Tapping into roof runoff turns free precipitation into a reliable water source for vegetables, orchard trees, and livestock pens. Building an efficient setup requires selecting durable components that direct clean water into storage while keeping organic debris out.

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Planning Your Home Rainwater Catchment System

Calculating collection potential is the logical starting point for any catchment setup. A basic rule of thumb is that one inch of rain falling on a 1,000-square-foot roof section yields approximately 600 gallons of usable water. Factoring in local rainfall patterns helps determine whether a small collection barrel or a multi-hundred-gallon cistern system makes sense for your property.

Siting storage units requires balancing gravity with convenience. Placing barrels near high-need areas like greenhouse beds or vegetable plots eliminates long hose runs and tedious bucket carries. Keep in mind that full water tanks are exceptionally heavy, so foundations must be perfectly flat, level, and structurally sound before the first rain event arrives.

The quality of captured water directly depends on the filtering stages placed between the roof and the storage container. Roofs collect dust, bird droppings, and leaf litter between storms, making pre-filtration necessary to protect pumps and keep water smelling fresh. Designing a modular system allows easy upgrades as storage needs expand over time.

Rain Barrel – RTS 50-Gallon Eco Rain Barrel

A rain barrel serves as the primary collection point for localized roof runoff, capturing water right at the downspout for immediate garden use. It eliminates the need to run long hoses from household spigots for basic hand-watering tasks around outbuildings and raised beds.

The RTS 50-Gallon Eco Rain Barrel stands out due to its rotomolded, heavy-duty recycled polyethylene construction that will not crack or fade under relentless summer sun. Its smart flat-back design allows it to sit completely flush against barn or house walls, saving precious walkway space. Unlike cheaper models with flimsy plastic valves, this barrel includes a durable solid brass spigot that accepts standard garden hose threads without leaking or stripping.

• Key Features: 50-gallon capacity, 100% recycled plastic, built-in brass spigot, flat-back footprint.
• Compatible Uses: Hand-watering garden beds, filling watering cans, flushing outdoor wash stations.
• Sizing & Fit: High-capacity flow for standard residential downspouts.

Elevating this barrel on cinder blocks or a timber frame is necessary to gain sufficient gravity pressure for hose draining. Regular cleaning of the top debris screen keeps mosquitoes from breeding inside during high-humidity months.

This unit is ideal for backyard gardeners and small homesteads needing direct water access near raised beds. It is not suitable for large-scale crop production that demands thousands of gallons of pressurized storage.

Downspout Diverter – EarthMinded Universal Kit

Downspout diverters channel water directly into collection barrels while automatically bypassing overflow back down the regular drain pipe once the container fills up. This prevents foundation flooding and keeps water from spilling over the top edge of the barrel.

The EarthMinded Universal Kit is a superior choice because it installs directly into existing downspouts without requiring full structural cuts or complex elbows. The kit includes a specialized hole saw and rubber diverter boot that flexes to seal tightly inside standard downspout materials. Its patented design automatically redirects rainwater to the barrel until full, then passes excess water safely down the main drain.

• Specs & Options: Fits standard 2×3 inch and 3×4 inch rectangular downspouts, as well as round spouts.
• Included Tools: Hole saw bit, rubber diverter sleeve, connection hose, and winterizing plug.

Proper placement is critical during installation, as the diverter hole must align perfectly level with the barrel intake port for the automatic bypass mechanism to function correctly. Removing the internal rubber boot each autumn takes less than five minutes and prevents ice accumulation inside the line.

This diverter is perfect for DIY homesteaders looking for a clean, automated setup without altering permanent metal downspouts. It is not recommended for smooth-walled custom copper downspouts where drilling holes damages high-end architectural finishes.

Gutter Guard – A-M Aluminum Gutter Screen

Gutter screens act as the first line of defense in a catchment setup, keeping pine needles, broad leaves, and large debris from clogging downspouts and entering water tanks. Capturing clean water starts at the roofline before organic matter begins decaying in standing water.

The A-M Aluminum Gutter Screen earns its spot through high-grade mill-finish aluminum construction that never rusts, sags, or brittle-cracks like vinyl alternatives. Its heavy-duty bubble pattern promotes high-volume water flow directly into the gutter channel while elevated ridges allow wind to blow dry leaves off the top surface naturally.

• Materials: Heavy-gauge 0.018 mill-finish aluminum.
• Maintenance: Virtually zero maintenance; snap-in design stays secure under heavy ice loads.
• Size Options: Standard 5-inch and 6-inch gutter widths.

Installing these screens requires tucking the back edge under the bottom row of roof shingles and fastening the front lip to the gutter edge with enclosed stainless steel screws. Ensure gutters are thoroughly cleaned and flushed before securing the screens permanently in place.

This guard is a must-have for properties situated under heavy tree canopies or near pine stands. It is unnecessary for outbuildings standing completely clear of overhanging branches, though it still provides value by keeping nesting birds out of open gutters.

First Flush Diverter – Rain Harvesting Kit

The first few minutes of a storm wash dust, pollen, bird droppings, and heavy debris off the roof surface. A first flush diverter captures and isolates this initial dirty water volume, ensuring only clear, polished water enters your main storage containers.

The Rain Harvesting First Flush Kit uses a reliable float ball mechanism that systematically closes off the diverter chamber once filled with dirty water, routing all subsequent clean water directly into your storage tank. As the chamber fills, an internal floating ball rises until it seals against a top rubber seat, keeping contaminated water isolated until the storm passes.

• System Function: Isolates initial high-contamination roof washings automatically.
• Included Parts: T-junction socket, ball seat, internal float ball, slow-release drain valve, filter screen.
• System Requirement: Requires standard 3-inch or 4-inch PVC pipe (sold separately) to form the diversion chamber.

The length of pipe attached to the kit dictates how many gallons of initial dirty water are diverted before clean water enters storage. A slow-drip drain valve at the base slowly empties the chamber between rain events, resetting the system automatically for the next storm.

This component is essential for growers using stored water for overhead crop spraying or washing harvested produce. It is unnecessary if captured water is strictly used for ornamental lawns or non-edible landscaping.

Water Storage Tank – Bushman Slimline Cistern

When small rain barrels prove insufficient for dry summer stretches, bulk water storage tanks provide the capacity needed to keep crops alive through extended droughts. A high-capacity cistern secures hundreds of gallons in a single compact footprint.

The Bushman Slimline Cistern is designed specifically for small-scale agricultural sites and homesteads where space is at a premium. Constructed from UV-stabilized, food-grade polyethylene, this tank withstands harsh outdoor exposure without leaching chemicals or degrading under direct sunlight. Its narrow profile allows high-volume storage directly alongside barn walls, shed foundations, or fence lines without blocking access pathways.

• Capacity Options: Ranging from 305 to 620 gallons.
• Construction: Virgin, food-grade UV-stabilized poly resin with built-in brass outlet bulkheads.
• Dimensions: Extremely narrow depth for close-wall placement.

A full 500-gallon cistern weighs over 4,000 pounds, requiring a dead-level base made of compacted crushed stone or poured concrete. Skipping base preparation leads to settling, structural tipping, and cracked bottom fittings over time.

This cistern is perfect for serious vegetable growers, small orchards, and livestock owners who need reliable water reserves. It is not suitable for temporary setups or renters who require portable equipment that can be moved easily.

Utility Pump – Wayne VIP50 Submersible Pump

Gravity provides low pressure out of storage tank spigots, which works fine for filling buckets but falls short when pushing water through long hoses, sprinklers, or overhead spray nozzles. A dependable utility pump adds the pressure needed to move water across a homestead efficiently.

The Wayne VIP50 Submersible Pump features a robust 1/2-horsepower motor housed in a corrosion-resistant thermoplastic body designed for continuous water transfer. Its bottom-suction design draws water down to 1/8 inch from the tank floor, allowing growers to maximize usable storage capacity. Capable of pumping up to 2,500 gallons per hour, it easily delivers the force necessary to run standard garden sprinklers from rainwater tanks.

• Performance: 1/2 HP motor, maximum flow rate of 2,500 GPH.
• Discharge Size: 1-1/4 inch NPT discharge with a 3/4-inch garden hose adapter included.
• Debris Handling: Passes up to 1/2-inch suspended solids without clogging.

Submersing the pump directly inside open-top cisterns or large barrels provides quiet, self-priming operation without requiring external suction hoses. Always run the pump on a GFCI-protected circuit to ensure electrical safety around wet agricultural zones.

This pump is indispensable for growers who need to push water uphill or operate standard garden sprinklers from remote storage tanks. It is unnecessary for small gardens where simple gravity feed to a single hand-held hose works fine.

Tank Strainer – Rain Harvesting Steel Screen

Storage tanks require a wide inlet opening to accept high-volume flow from downspouts, but open top ports invite mosquitoes, frogs, rodents, and leaves into stored water. A high-grade tank strainer seals off the inlet while maintaining rapid intake capabilities.

The Rain Harvesting Tank Screen utilizes ultra-fine, corrosion-resistant stainless steel mesh mounted inside a durable polypropylene rim. The 955-micron steel mesh is fine enough to prevent mosquito entry entirely while allowing heavy rainwater downpours to pass through without splashing over the sides. Unlike nylon mesh covers that tear and break down under solar heat, this rigid stainless screen withstands heavy sun exposure and falling debris.

• Screen Spec: 955-micron stainless steel mesh.
• Compatibility: Fits standard 12-inch and 16-inch tank entry cutouts.
• Resistance: UV-resistant frame, pest-proof mesh density.

Leaves and windblown soil accumulate on the screen surface over time, requiring periodic brushing to keep water flowing freely during severe storms. Securing the screen to the tank lid with screws prevents small animals from dislodging it.

This component is essential for any open-top collection drum or large storage cistern with an exposed top portal. It is unnecessary for fully sealed inline systems where water enters exclusively through closed PVC plumbing pipes.

Linking Kit – RTS Rain Barrel Connector Hose

Connecting multiple rain barrels together creates an expanded, interconnected storage network without needing to tap extra downspouts around outbuildings. Water fills the main barrel first and automatically flows into adjacent barrels as storage levels rise.

The RTS Rain Barrel Connector Hose features heavy-duty corrugated flexible tubing paired with tight-sealing rubber grommets that prevent leaks at connection ports. The broad inner diameter allows rapid liquid transfer between tanks, ensuring secondary barrels fill at the same pace as primary intake barrels during intense downpours.

• Components: Flexible corrugated hose, two rubber sealing grommets.
• Hole Size Required: Requires a standard 1-1/4 inch drill hole in container walls.
• Expandability: Allows infinite chain connections across multiple barrels.

All linked barrels must sit on a completely flat, level plane so water fills evenly across the entire series. Installing the connector hose near the top rims of the barrels preserves maximum holding capacity before water levels equalize.

This kit is ideal for growers expanding storage capacity gradually along long outbuilding walls. It is unnecessary for operations utilizing a single large cistern for bulk storage.

How to Keep Stored Rainwater Clean and Safe

Maintaining clean harvested water requires controlling light exposure, organic inputs, and insect access. Storing water in opaque, UV-stabilized containers blocks light penetration, preventing nuisance algae from growing inside tanks and clogging downstream drip emitters.

Regularly inspecting and emptying first flush diverters keeps decaying organic material out of long-term storage tanks. Adding biological controls like Bacillus thuringiensis israelensis (BTI) dunks to open barrels safely eliminates mosquito larvae without harming crops, soil biology, or livestock.

Preparing Your Rainwater System for Winter

Freezing temperatures pose a severe threat to rainwater harvesting equipment, as expanding ice quickly cracks plastic fittings, splits poly barrels, and destroys pump housings. Winterization must occur well before the first hard freeze hits your region.

Start by draining all collection barrels, cisterns, and above-ground plumbing lines completely. Disconnect downspout diverters and insert winterizing plugs to route seasonal snowmelt through main drain pipes, then store submersible pumps and flexible connector hoses inside frost-free outbuildings until spring.

Essential Safety Tips for Home Water Reuse

Harvested rainwater collected off residential roofs is non-potable and should never be consumed by humans or farm animals without specialized filtration and chemical treatment. Clearly label all storage tanks, spigots, and dedicated hoses with "Non-Potable Water – Do Not Drink" signs to prevent accidental ingestion by farm hands or visitors.

When applying harvested water to vegetable gardens, direct flow to the soil around root bases rather than spraying directly onto edible leaves. Avoid harvesting water off roofs constructed with treated wood shakes, old copper flashing, or lead-based paints to prevent heavy metals from leaching into your garden soil.

Investing in dependable catchment equipment transforms unpredictable rainfall into a reliable, manageable resource for your land. A thoughtfully designed system saves time, protects crops through seasonal dry spells, and keeps your homestead self-sufficient year after year. Focus on solid filtration, durable storage, and simple routine maintenance to make every drop count.