Control Structure

LWDD’s Role In Water Conservation

Florida is fortunate to receive over 50 inches of rainfall a year on average. Most of that amount is concentrated during the six-month rainy season (May through October). While some of the runoff from these rains is discharged to the ocean to avoid flooding, a significant amount soaks into the ground and recharges the freshwater aquifers that supply our drinking water wellfields, lakes and wetlands.

For large populations of people to live safely in south Florida, a massive regional water management system is required to balance the water supply needs of urban areas and water uses of agriculture against the requirement to maintain flood protection. If we did not provide adequate drainage to the region, human health and safety would be jeopardized and extensive property damage could occur. Similarly, if regional groundwater levels were not properly maintained, wellfields would be unable to deliver water to our homes and businesses, or worse yet, the underground inland migration of salt water from the ocean could permanently contaminate the drinking water supply rendering it unsafe for potable uses.

Water conservation efforts by the LWDD help mitigate some of the water supply issues our region experiences. The large network of LWDD canals plays a critical role in conservation by maintaining groundwater levels which in turn supports the water levels in lakes, ponds and wetlands across the region. During dry periods, groundwater levels tend to slowly fall in response to low rain and high evaporation. When this occurs, water managers in the region look to large regional storage areas like the Water Conservation Areas in the Everglades or to Lake Okeechobee as a source of supplemental water. Water from these sources is released into the canal network to raise the level of water in the canals. This water in turn seeps through the sandy soils to recharge the groundwater and returns the water table to its normal elevation thus helping to protect drinking water supplies.

The LWDD’s efforts, to manage drainage canals at appropriate elevations to balance water supply needs and avoid ocean discharges when possible, plays a key role in comprehensive water conservation for South Florida.

Stormwater graphic

Managing Residential Water Pollution

If it falls on the ground, it can end up in the water

Water is made available to us through a process called the water cycle. The process begins with the evaporation of water from the earth’s surface. The sun heats the water creating a moisture vapor that rises into the atmosphere. When the atmosphere cools, the vapor condenses to form clouds. Eventually, the clouds will release moisture in the form of rain or snow depending on your location. When the rain hits the ground, some of this surface water will infiltrate, helping to recharge the underground aquifer. Some of the surface water will run off into canals. Finally, some of the surface water will be reheated by the sun and the water cycle will continue.

In our area of south Florida, we get our drinking water from surface water supplies. Surface water will runoff roof tops, over lawns and roadways into the storm drains or inlets. As this water travels across the surface it picks up sediment, trash, fertilizers, pesticides and oils washed off streets and lawns. Surface water will eventually flow through underground pipes making its way into the canal system which recharges the surficial aquifer and some municipal wellfields.

Residents can take simple steps to reduce or eliminate residential water pollution. Do not over apply fertilizers or pesticides on lawns and use specific spot treatments rather than general broadcast application methods. Spray on windless days and not before or during rain events. Dispose of unused paint and household chemicals correctly. Never dump them into toilets, sinks, storm drains or canals. Chemicals such as chlorine are very toxic to fish and animals. When draining hot tubs or pools, direct the water away from the canal. Wash cars with a minimum of detergent and wash on gravel or lawns to avoid runoff entering storm drains and canals. Sweep your walks and driveways instead of using a garden hose which can wash litter and pollutants into storm drains and canals. Remember, if it falls on the ground, it can end up in the water.