How Swales Work: Guiding Rainwater Through Neighborhood Landscapes

HCMUD 0712026-08-12T11:34:20-05:00August 12, 2026|

After a heavy rain, water does not simply disappear from streets, yards, and common areas. It must be directed safely through the neighborhood and into the drainage system. One way this happens is through swales, which are shallow, gently sloped drainage features designed to guide rainwater across the landscape.

A swale is not a ditch in the traditional sense. It is usually a wide, shallow depression in the ground that allows stormwater to move slowly and naturally from one area to another. In residential neighborhoods, swales may be located along property lines, behind homes, near common areas, or within landscaped areas where water needs to be directed toward storm drains, detention ponds, or other drainage facilities.

Swales are designed to move water without causing erosion or concentrating flow. Their gentle slope allows runoff to spread out and travel at a controlled pace. Grass or other vegetation within the swale helps slow the water, filter sediment, and reduce soil movement during rainfall. When properly maintained, a swale can help manage stormwater while blending into the surrounding landscape.

In areas with clay soil, such as the Katy area, swales are especially important. Clay soil absorbs water slowly, which means runoff often needs a clear path to move away from low areas. A properly functioning swale helps guide that water without requiring a concrete channel or underground pipe in every location.

You may notice that swales hold water briefly after a rain. This can be normal, especially after heavy storms. However, water should generally continue moving or drain within a reasonable period of time. Standing water that remains for an extended period may indicate compacted soil, sediment buildup, overgrown vegetation, or changes to the original grading.

Homeowners should not fill, block, or alter swales on their property without seeking professional assistance. Adding soil, landscape edging, fences, raised beds, or other obstructions can change how water moves and may cause drainage problems for homeowners and nearby properties. Any grading or landscape changes must be planned carefully to ensure runoff does not pool, shift onto neighboring lots, or interfere with established drainage patterns.

Routine maintenance can help swales continue working properly. Residents with swales on their property should keep grass trimmed, remove leaves and debris, and avoid placing mulch or yard waste in drainage paths in order to keep water moving as intended.

If a swale on HCMUD 71 property is blocked, eroded, or holding water for a prolonged period, please contact the HCMUD 71’s operator, Regional Water Corporation, at (281) 897-9100.

Swales may look like ordinary grassy areas, but they serve an important drainage purpose. By understanding how they work and keeping drainage paths clear, residents can help support proper stormwater flow throughout the neighborhood.

Backflow Prevention: Why It Matters for Drinking Water Safety

HCMUD 0712026-08-07T11:46:03-05:00August 7, 2026|

Clean, reliable drinking water depends on keeping public water systems protected from possible sources of contamination. One important way this is done is through backflow prevention devices. Backflow occurs when water flows in the opposite direction from what is intended. Under normal conditions, water moves in pressurized lines from the District’s water system into homes and businesses. However, changes in pressure can sometimes cause water from a private plumbing system, irrigation system, pool, hose, or other source to flow backward into the public water supply. This can happen during disruptive events such as a water main break, firefighting activity, or other sudden changes in system pressure.

Backflow prevention devices are designed to stop this from happening. These devices create a physical barrier that prevents water from flowing back into the drinking water system. They are commonly used and, to ensure the security of the public water supply, are required for irrigation systems, commercial properties, certain plumbing connections, and other locations where a cross-connection could exist.

For many homeowners, the most common potential backflow concern is from their irrigation system. Lawn sprinkler systems may be connected to fertilizer injectors, exposed to standing water, or include sprinkler heads that sit below grade. Without proper protection, changes in pressure could potentially allow water from the irrigation system to be pulled back toward or into the drinking water supply. A properly installed and maintained backflow prevention device helps protect both the homeowner and the community.

HCMUD 71 requires backflow prevention devices on all sprinkler systems, spas, pools, and certain commercial properties. HCMUD 71 may also require other users to install backflow prevention devices per its Rate Order.

Residents can help by making sure any required backflow prevention devices on their property are installed, maintained, and tested as needed. Homeowners should also avoid creating potentially unsafe connections, such as leaving hoses submerged in pools, buckets, or chemical containers. Hose-end sprayers used for fertilizers, cleaners, or pesticides should be disconnected after use and never left attached in a way that could potentially allow chemicals to be drawn back into the public water system.

HCMUD 71 and its operator, Regional Water Corporation, work to protect the District’s drinking water system through monitoring, maintenance, and compliance with State requirements. Backflow prevention is one part of that larger effort. By understanding how backflow happens and taking basic precautions at home, residents can help protect the safety and quality of the drinking water supply

If you have questions on backflow detection devices and when/where they are required, please contact HCMUD 71’s operator, Regional Water Corporation, at (281) 897-9100.