3 men

It Takes 3

/in , ,

Man-made stormwater ponds are attractive enhancements to many residential communities and businesses within the Lake Worth Drainage District (LWDD). More importantly, these waterbodies serve an important public safety purpose as they are part of the overall flood control system.

When it rains, stormwater flows into the retention pond and, if needed for flood control, out through the pond’s discharge control structure into the LWDD canal. Most of the time this drainage occurs unnoticed by the average individual. However, during a severe storm, flooding in streets, sidewalks, and driveways may occur. This nuisance flooding may cause concern, but it is important to note these low-lying areas are designed as secondary detention areas to protect buildings and homes from flooding.

Within LWDD, flood control is a shared responsibility and achieved through an interconnected, 3-tiered drainage system governed by 3 unique groups of people. Through communication and coordination, these 3 groups can provide effective flood control. The groups are identified as:

  • Neighborhood drainage systems operated by property owners or residential associations
  • Secondary drainage systems operated by LWDD or municipalities
  • Primary drainage system operated by the South Florida Water Management District

Water managers in charge of primary and secondary systems are continually monitoring the weather and canal levels to proactively respond to changes in canal elevations. In anticipation of a heavy rainfall event, water managers will make operational adjustments to maintain appropriate water elevations for flood control. Additionally, throughout the year routine canal maintenance is conducted to provide unobstructed flow in the canal channel and access along the canal rights-of-way. The inspection of control structures, pumps and other infrastructure is also conducted, and repairs or replacements are made.

Property owners and residential associations have a similar role regarding their neighborhood drainage system. They must maintain their drainage infrastructure to ensure that inlets, storm drains, pipes, and discharge control structures are free of potential blockages and working as designed, thus maintaining the flow of stormwater away from their property. An annual inspection of the drainage infrastructure should be made, and repairs should be completed before the start of the storm season on June 1.

Neighborhood drainage systems with operable discharge control structures can request permission from LWDD to open their structure prior to a severe storm. This will provide additional onsite storage capacity within the stormwater pond. Additionally, this group should register with LWDD the individuals who are responsible for the maintenance of the neighborhood drainage system and control structure operation. It is recommended that communities update this registration at least once a year to verify the contact information is current. This will ensure that important weather alerts and instructions are being sent to the appropriate designated individuals. A registration form can be found on LWDD’s website at https://lwddnet.wpengine.com/2296-2.

Girl

Hurricane Season Is Almost Here!

/in , ,

Florida’s hurricane season begins on June 1 and ends November 30. Based on historical weather records dating back to the 1950s, a typical season will average 12 tropical storms with sustained winds of at least 39 miles per hour, of which six may turn into hurricanes with winds of 74 miles per hour or more. In addition to high winds, hurricanes and tropical storms can bring torrential rainfall. These severe weather events can produce localized flooding that can be exacerbated by improperly maintained drainage systems.

Residential communities and businesses can help mitigate the impacts of severe storms with a few simple steps. One of the most important steps is the regular inspection and maintenance of drainage infrastructure. Drainage infrastructure can include inlets, discharge control structures, connecting pipes, and ponds. Proper maintenance of these facilities will ensure the unobstructed flow of stormwater and fully operational equipment.

Secondly, residential communities and businesses with operable discharge control structures can request authorization from the Lake Worth Drainage District (LWDD) to open these structures prior to the storm. Lowering pond levels provides additional storage for excess stormwater.

LWDD recommends establishing a Drainage Committee whose role is to provide for the maintenance and operation of the community or business’s drainage system. Drainage Committees may consist of board members, residents, and/or property managers. All members of the Drainage Committee should register with LWDD on its website at www.lwdd.net. This registration process ensures LWDD water managers know who to contact and where to send important weather alerts and instructions.

While weather predictions are becoming more sophisticated, forecasters are still unable to predict exactly where a storm will make landfall. The likelihood of flooding depends on several variables such as rainfall volume, ground moisture, and local terrain. No system, no matter how well designed, is 100% flood-proof. However, good maintenance practices are the first step to protecting you from potential flooding. Find more information about community flood control on our website https://lwddnet.wpengine.com/property-managers-hoa.

Inspector Gunther using tablet for data collection

LWDD Return to Normal Operations

/in ,

The Lake Worth Drainage District (LWDD) will return to regular business hours tomorrow, Wednesday, September 4. Business hours are Monday through Friday, 8:00 a.m. to 5:00 p.m.

The Board of Supervisors Workshop will be held Wednesday, September 4 as previously scheduled; however, the meeting will begin at 9:00 am instead of 8:30 am.

LWDD Storm Crews will begin conducting immediate post-storm assessments. Work is prioritized to first remove any debris in canals and near structures which are a direct threat to drainage efforts. Any additional vegetation and debris removal will take place in the following weeks by first addressing vegetation blocking the canal rights-of-way or significantly leaning over the waterway.

Property owners are asked to remove and dispose of vegetation and debris properly. It is unlawful to place trimmings on canal rights-of-way, and illegal dumping will be reported to authorities.

Thank you for your cooperation during Hurricane Dorian and as we all return to normal activities.

Control Structure

Technology Enhances Flood Control

/in , , ,

South Florida’s tropical weather events can be intense and seriously threaten property and life. In response, the Lake Worth Drainage District (LWDD) monitors canal elevations and makes necessary operational adjustments to its water control structures to provide flood control for the 200 square miles of land within its boundary.

Water control structures act like dams, allowing stormwater to be released or held back depending on weather conditions. The technology used to operate LWDD’s water control structures is called Supervisory Control and Data Acquisition (SCADA). As the water rises in the canal and reaches a pre-determined elevation, SCADA will slowly open control structures releasing water for flood control. Similarly, as water elevations return to normal levels the control structure gates will close, holding back water for conservation and water supply demands.

This response to changes in the canal system happens automatically and can be monitored remotely by staff using mobile devices. However, in anticipation of severe weather, staff can override the automated SCADA system and make manual adjustments as needed. The remote monitoring and operating functions of SCADA eliminates the need for LWDD staff to venture out during dangerous weather conditions to operate control structures, as well as significantly reduces response time.

Another advantage to SCADA is the capture of operational data by the system which can be used to evaluate future water supply needs and historical flood control responses. This data can be shared with regional water management partners for enhanced flood control coordination and water conservation measures.

LWDD is proud to provide the residents and businesses within our boundary this advanced flood control technology.

Rain flows down from a roof down

The Probability of Flood Risk

/in ,

In some places, homes and businesses constructed in areas known as the 1-in-100-year flood plain have been hit by multiple floods in the same year. The assumption that if their area has experienced a 1-in-100-year flood, then for the next 99 years they do not have to worry about flooding is not correct.  While it’s unlikely that two large storms will happen in close succession, history has demonstrated that it is not impossible.

Confused by the term 1-in-100-year flood, many people begin to wonder what their flood risk really is. The definition of a 1-in-100-year flood is a flood that has a 1% chance of occurring in any given year. Understanding the probability of your flood risk can be a complex process, but the hydrologists at the U.S. Geological Survey (USGS) are striving to communicate risk more effectively, in part by transitioning away from the term 1-in-100-year flood and instead referencing multiple year flooding probabilities. For example, a home in the 1-in-100-year flood plain can be better understood as a home with a 26% chance it will flood over the course of a 30-year mortgage.

Providing residents and community leaders with a clearer understanding of the probability of flood risk for a location is important. It allows decisions to be made that will better protect themselves and the community. For more information on flood risk probability, visit the USGS website at https://www.usgs.gov/special-topic/water-science-school/science/floods-and-recurrence-intervals.