Water Management Guide: Dams, Reservoirs, and Drought Survival

Water is the single most important resource in Timberborn. It drives every aspect of your colony: drinking water for beavers, irrigation for crops and trees, power generation from Water Wheels, and even late-game Badwater processing. Mastering water management separates thriving colonies from dead ones. This guide covers the complete water system, from basic physics to advanced reservoir engineering, giving you the knowledge to build colonies that survive even the longest droughts.

How Water Physics Work in Timberborn

Timberborn uses a hybrid 2D/3D water simulation system. Water is modeled as a sheet laid over the terrain, with its height determined by ground elevation and water depth at each tile. This creates realistic-looking rivers, lakes, and floods while remaining computationally manageable.

Water flows from higher elevations to lower elevations following the path of least resistance. Flow speed depends on the height differential: a shallow river encountering a Dam spills slowly over the top, while releasing a massive reservoir onto a plain below creates rapid flooding. Water cannot pass underneath other water. This means you cannot open a Floodgate from the bottom and have water flow out beneath the surface; it would cause the physics simulation to break. All water release happens from the top of a structure downward.

Water evaporates at a constant rate of 0.045 units per exposed tile per day. This means shallow, wide bodies of water lose volume much faster than deep, narrow channels. A reservoir that is 2 tiles wide and 10 tiles deep loses far less water to evaporation than one that is 20 tiles wide and 1 tile deep, even if they hold the same total volume. Understanding this principle is fundamental to efficient reservoir design.

Irrigation spreads outward from water sources, turning dry brown terrain into green irrigated land where crops can grow. The irrigation range depends on water depth and terrain. Deeper water irrigates a larger radius. During droughts, irrigation recedes as water levels drop, which means crops furthest from your reservoir will die first.

Dam Types and Their Uses

Timberborn provides three primary water-blocking structures, each serving a distinct purpose. Understanding when to use each type is critical for effective water control.

The Dam is a 1x1 structure that blocks fluid flow at a height of 0.65 blocks. Water that rises above this height spills over the top. Dams are cheap, requiring only 2 Logs to construct, and are the first water control structure available. Their spillover behavior makes them ideal for creating shallow reservoirs and regulating downstream flow during temperate weather. Stack multiple Dams vertically (by building on terrain or platforms) to increase the effective holding height. A common early-game strategy is placing a single row of Dams across a narrow river point to create your first reservoir.

The Levee is a 1x1 structure that completely blocks all water at any height. Unlike Dams, water never spills over a Levee. This makes Levees essential for building tall reservoir walls and preventing overflow. Levees cost 4 Logs each and must be unlocked through research. They are your primary tool for creating deep storage reservoirs. Place Levees on top of Dams to create a hybrid wall where the Dam handles the base water level and the Levee seals the top.

The Floodgate is the most versatile water control structure. It functions as a solid water blocker (like a Levee) that can be manually adjusted to allow water through. You control the opening height, letting you regulate exactly how much water passes through. Floodgates are more expensive, requiring Planks and Gears, but they are indispensable for advanced water management. Use Floodgates as the controlled release point in your reservoir walls, keeping them closed during temperate weather to fill the reservoir, then opening them during drought to slowly feed water to your Water Pumps.

Designing Effective Reservoirs

A well-designed reservoir is the difference between a colony that barely survives droughts and one that thrives through them. Several principles guide optimal reservoir design.

Depth over breadth is the most important principle. Because evaporation occurs per exposed surface tile, deep reservoirs lose proportionally less water than shallow ones. A reservoir that is 5 tiles long, 2 tiles wide, and 4 tiles deep holds 40 cubic units of water but only exposes 10 surface tiles to evaporation. Compare that to a 20x2x1 reservoir that also holds 40 units but exposes all 40 tiles. The deep reservoir loses roughly 0.45 units per day to evaporation, while the shallow one loses roughly 1.8 units per day.

Natural terrain features are your best friends for reservoir placement. Look for narrow canyons, valleys between cliffs, or natural depressions in the landscape. Damming a narrow canyon requires fewer blocks than creating walls in open terrain. Many maps include natural reservoir sites that only need a small Dam wall to hold large quantities of water.

Use Dynamite (unlocked through research) to excavate deeper reservoir basins. Removing terrain blocks below the water line dramatically increases your storage capacity. A reservoir dug 3 blocks below the riverbed holds significantly more water than one at the natural surface level. Combine excavation with tall Levee walls for maximum capacity.

Consider building multiple smaller reservoirs rather than one massive one. Distributed water storage provides redundancy: if one reservoir fails or is contaminated by Badwater, others remain clean. Place reservoirs at different elevations to create a gravity-fed cascade system, where higher reservoirs drain into lower ones through Floodgates, extending the time water remains available during drought.

Water Storage Calculations and Planning

Precise water storage planning prevents unexpected shortages. Here are the key numbers you need to plan effectively.

Each beaver consumes approximately 2 units of water per day for drinking. Additional water is consumed by certain buildings and processes. A safe planning figure is 3 units of water per beaver per day to account for all uses. For a colony of 20 beavers facing a 10-day drought, you need at minimum 600 units of stored water (20 beavers multiplied by 3 units multiplied by 10 days).

Small Water Tanks hold 30 units each and cost 20 Logs. Large Water Tanks hold 100 units each and require Planks and Gears. In the early game, build 3 to 4 Small Water Tanks as soon as possible. By mid-game, transition to Large Water Tanks for more efficient storage. Tank water does not evaporate, making tanks the most reliable form of drought insurance.

Reservoir water is calculated as width times length times depth in tiles. One tile of water depth equals roughly 1 unit of stored water per surface tile. A 10x5 reservoir filled to 3 tiles deep holds approximately 150 units. Factor in evaporation losses: at 0.045 per tile per day, that 50-tile surface loses about 2.25 units per day. Over a 10-day drought, evaporation claims roughly 22.5 units, leaving you with 127.5 usable units from the reservoir alone.

Always plan for droughts 50% longer than the longest you have survived. Drought duration increases progressively each cycle: on normal difficulty, early droughts last 2 to 3 days, but later droughts can stretch well beyond 10 days. On hard difficulty, droughts start at 3 to 6 days and can eventually exceed 20 days. Build your water infrastructure for the droughts ahead, not just the ones behind you.

Water Pumps and Distribution

Getting water from your reservoir into your tanks and to your beavers requires pumps. Each faction has different pump options with distinct capabilities.

The basic Water Pump (Folktails) draws water from an adjacent water source up to 2 tiles deep. It requires no power and operates as long as a worker is assigned. Place Water Pumps directly next to your reservoir or river, ensuring the water adjacent to the pump is at least 1 tile deep. The Mechanical Water Pump (Iron Teeth) functions similarly at game start.

The Deep Water Pump (Iron Teeth exclusive) can draw water from up to 6 tiles deep, making it far superior for accessing deep reservoirs and wells. This is one of the Iron Teeth faction's greatest advantages. Folktails can unlock a deeper pump through research but it never matches the Iron Teeth version's depth.

Water distribution uses Water Dumps, which release stored water into the environment, and direct tank-to-consumer pathways. Beavers automatically visit the nearest Water Tank or Water Pump output to drink. Place water access points near housing clusters to minimize travel time. During drought, consolidate your active Water Pumps to the deepest part of your reservoir where water will remain longest.

Water Flow Control and Floodgate Management

Floodgates are the most powerful tool in your water management arsenal. Mastering their use transforms your colony from reactive drought survival to proactive water planning.

During temperate weather, keep all Floodgates closed to fill reservoirs to maximum capacity. The river flows continuously during temperate seasons, so every tile of reservoir depth you fill is water banked for the next drought. Only open Floodgates if you need to maintain downstream irrigation for farms that sit below your dam.

When drought begins, open Floodgates partially to release water slowly. The goal is to maintain a minimal but consistent water level downstream of your dam, keeping your Water Pumps supplied and maintaining irrigation for as long as possible. A fully open Floodgate dumps water quickly, wasting it; a barely open Floodgate releases a trickle that can extend your water supply by days.

Create a cascade system with multiple Floodgates at different elevations. A high reservoir feeds into a mid-level holding pool through one Floodgate, and the mid-level pool feeds your main colony area through another. This two-stage system gives you finer control over water release rates and ensures a more consistent water level at your pump stations.

An advanced technique is the water battery: a sealed reservoir (all Levee walls) with Floodgates as the only exit. During temperate weather, fill it completely. During drought, open the Floodgate a tiny amount to release water at a controlled rate. Combined with deep excavation, a single well-designed water battery can sustain a district of 30 to 40 beavers through droughts lasting 15 or more days.

Advanced Water Techniques

Once you master the basics, several advanced techniques can dramatically improve your water efficiency.

Aqueducts and water channels let you redirect water from distant sources to your colony. Build elevated channels using Platforms with Levee walls to move water across terrain that would otherwise be impassable. This is especially useful on maps where your colony is far from the main river. Water channels follow the same physics as natural rivers: water flows downhill, so maintain a slight elevation gradient in your aqueduct.

Water recycling through Fluid Dumps lets you release stored water back into the environment to maintain irrigation during drought. Place a Fluid Dump at the upstream end of your farm area and release small amounts of tank water to keep crops irrigated even when the river is dry. This consumes your stored water but can save critical food production during extended droughts.

Stacked reservoirs at multiple elevations maximize storage on maps with varying terrain. Build a high reservoir at the source, a mid-level reservoir in the middle of your colony, and a low reservoir at the bottom. Each level catches water released from above, giving you three chances to use every unit of water before it flows off the map.

For Iron Teeth players, the Badwater Discharge combined with a Large Water Wheel creates a drought-proof power source. During badtides, contaminated water flows continuously, powering your water wheels even when clean water is unavailable. Pair this with Centrifuges to convert the Badwater into useful Extract while generating power simultaneously.

Drought Preparation Checklist

Before every drought, run through this checklist to ensure your colony is prepared. These steps apply regardless of faction, difficulty, or map.

Verify water storage: Calculate your total stored water (tanks plus reservoir volume) and divide by your population times 3. The result is the number of drought days you can survive. If this number is less than 150% of your expected drought length, build more Water Tanks immediately.

Check Floodgate positions: All Floodgates should be closed to maximize reservoir levels. Verify that no water is flowing out of your storage system unnecessarily. Check food reserves: Ensure you have at least 10 days of food stockpiled. Crops will die during drought if irrigation fails, so you cannot count on fresh harvests.

Pause non-essential buildings: During drought, shut down buildings that consume water or power unnecessarily. Focus your workforce on water distribution and essential services. If you run the Campfire or other comfort buildings, those workers might be better reassigned to critical infrastructure during severe droughts.

Position Water Pumps optimally: Move or build Water Pumps at the deepest point of your reservoir where water will persist longest. Pumps placed at shallow edges become useless once the water level drops below their intake depth. Having a backup pump at maximum depth is cheap insurance.

Common Water Management Mistakes

Avoid these frequent errors that plague even intermediate players. Building Dams too far downstream wastes potential reservoir capacity. Place your Dam at the narrowest point upstream that still provides enough basin area behind it. Every block of elevation you gain translates to significantly more stored water.

Forgetting to seal reservoir edges is a common and costly mistake. Water finds every gap in your Levee walls. A single missing block at ground level drains your entire reservoir. Always walk the perimeter of your dam walls to verify there are no gaps, especially where walls meet natural terrain. Use the water overlay to spot leaks.

Relying solely on reservoir water without building Water Tanks is risky. Reservoirs lose water to evaporation, and their levels are hard to monitor precisely. Water Tanks provide guaranteed, evaporation-free storage with clear capacity indicators. Use both systems together: reservoirs for bulk storage and irrigation, tanks for guaranteed drinking water.

Opening Floodgates too wide during drought is a classic beginner error. Players panic when they see the river drying up and release too much water at once. This wastes your reservoir in days instead of weeks. Practice opening Floodgates to the minimum setting that keeps your pumps supplied and adjust only as needed.