UPDATED: Monday April 18 at 10:31 AM
The District asked our Engineer, Jones & Carter, to explain the graph posted on our Website about the Brazos River. Jones & Carter tells us the graph is a projected water level of the Brazos River from a gauge in Richmond near the Highway 90A bridge. The blue line is the actual elevation the River is experiencing, and the purple is the projected level using the current level and expected rainfall within the Brazos River watershed. You can see there are several different action levels (moderate, severe, etc.). The minor flood stage is when the water level is expected to reach 45.
Pecan Grove MUD works closely with the Fort Bend Office of Emergency Preparedness in times like these. This River level alert is given to all of the surrounding areas to inform us that the water level in the Brazos River is elevated and they need to start preparing. All communities throughout the area have different levels of concern for the Brazos River flooding. Any time the level is expected to reach at least 45, the Pecan Grove MUD Emergency Action Plan goes into to action regardless of where the Brazos River actually is. What this means is that EDP is out at our storm water pump stations, operating them as necessary. EDP is currently dispatched all over the District, and for now the main focus is on the north storm pump station by the MUD’s Elevated Water Storage Tank. Oyster Creek is elevated and prohibiting gravity flow from Bullhead Bayou; this makes is necessary to operate the north end storm water pump station.
The biggest takeaway from this chart is that the Brazos River is not expected to peak until tomorrow. When the Brazos starts getting into the 48-49 range, portions of roadways in the Richmond area are blocked from the actual Brazos River flooding. This does not mean the local streets will not flood from local rainfall, which is already being experienced. Once the Brazos River increases in elevation, it will block our main storm water outfalls from draining by gravity and then all storm water pump stations will be required to operate. For reference, the last major flood the Brazos River experienced, the elevation reached around the 50 mark. This event is expected to be 7 inches below that. The overall elevation of the water will be 4-6 feet BELOW the toe of both of our Pecan Lakes and PGMUD levees.
This is the best prediction the National Weather Service, the Fort Bend Office of Emergency Management, and the Pecan Grove MUD can predict at this time; it can change as weather conditions change. The Board is monitoring the situation and has instructed Jones & Carter and EDP to update the website accordingly. We are working with closely with EDP during this event. Please refer back to the website for additional information as we can post it. Please keep in mind our first priority is taking care of the system for the flood protection of the District’s residents.