'Flash flooding' inundates Tortola 'trouble spots'
The rains and flooding lasted into the night, a result of the lingering weather system.
This was the case along the James Walter Francis Drive, in the vicinities of the Road Town Festival Ground and Delta Petroleum at Pasea Estate.
In the case of the Delta Petroleum at Pasea Estate, reporters from Virgin Islands News Online documented the constant rise and fall of flood waters.
The flood waters at times, caused the eastward bound double lane roadway, to be transformed into a single lane as drivers attempted to avoid the higher sections of the flooded road.
“This is giving me the creeps,” one driver who gave his name only as Sorrentino, as he got out his vehicle to examine the scene.
“This is not as bad as what happened here last year, they did a very good job with that ghut but mehson, the water is way too much,” he added.
Keep Rising
Echoing Mr Sorrentino, another motorist said, “…this could have been a whole lot worst…I been out here observing it (the water), as the rain pours it keep rising, it flooded that road in there (Purcell access road) but the water kept running off into the culvert.”
The onlooker who declined to be named, further explained, “as the rain keeps getting heavier and the gushes keep pouring out from the mountains, that culvert became a needle eye and so the road start flood, but is good thing they did that massive work after the hurricane because as the pressure eases the water recedes but by good God the rains just not stopping and that’s a problem again.”
Up to late last night (August 30, 2018) there were reports of flood waters posing a threat to several businesses especially in Pockwood Pond in the vicinity of the R and R Malone Complex, a major section of Waterfront Drive, Road Town, West End and East End Tortola.
7 Responses to “'Flash flooding' inundates Tortola 'trouble spots' ”
We seen yesterday how quick the place got flooded out. We see Irma garbage floating in the roads etc | we also saw the little man made hole (water drains) not big enough to filter the water through without over flowing the roads etc.
Now it’s good time for the minister of communications and works to read between the lines and get it sorted out ASAP. It will also help if humans can stop throwing TV’s / mattress/ strove etc into our guts so the drains could be cleaned.
A simple way to answer what is causing the flooding and how to mitigate it is following a rain drop or rain drops. When rain falls, some of it falls on leaves and evaporates, on roofs and typically runs off to the ground, infiltrates into the ground and runoff . It is the portion that runoff that causes flooding.
Rain moves from a higher elevation to a lower elevation, ie, from up hill down hill. In a drainage basin (watershed), runoff is channeled into ghuts, ditches, creeks, streams, rivers ........etc created by nature on its way generally out to sea. Interruption of this flow can result in flooding, ie, blocking ghuts, poorly maintained ghuts.......etc. Further, growth produces more hard surfaces, resulting in less runoff infiltrating into the ground, larger volume running off at a greater velocity. Poor drainage planning results in areas that didn’t flood before development flooding after development.
Moreover, to mitigate the increasing flooding, a drainage system (ghuts, pipes, ditches, inlets, manholes, catch basins, culverts, bridges....etc) must be designed and constructed to collect and convey runoff safely out to sea. The system should be designed to handle frequent rain events, ie, 2-year, 5-year, 10-year.......etc, along with less frequent rain events, ie, a 100- year rain event. What does a 100-year event means? It theoretically means that a 100-year rain has a 1% chance of occuring every year; nonetheless, the reality is that a 100-year rain can occur at any time. Will a well-designed and constructed drainage system solve the flooding problem?
No. A well-designed and constructed system that is poorly maintained could result in flooding. The drainage system should have a maintenance plan; the system should be continuously inspected and maintained periodically, ie, monthly, quarterly or more frequently as needed. Flood-prone areas should be inspected and maintained more frequently; they should be inspected and maintained as needed with the 1) forecast of heavy rainfall and 2)after a heavy rainfall.
Further, an engineering evaluation should be conducted on Wickhams Cay and other low lying areas on Tortola and outlying islands to ascertain if a drainage pump station(s) may be needed.
For the most part, growth and development, coupled with poor drainage infrastructure planning, design, construction and maintenance, contribute to flooding. Like water and wastewater, stormwater is the third leg of the water triangle. As such, it must be treated as a utility with the same attention, investment, care and feeding .......etc as its brethren water and wastewater. In the VI, the only precipitation that has to be concerned about is rain.
Thus, it must be effectively managed from the time the first drop hits the watershed to the last drop that is discharged into the sea. In big countries, surface runoff can take days, weeks, months or even years to reach the sea. However, in a small territory like the BVI, it takes less than an 60 minutes for runoff to roar down Great Mountain Ghut, Long Bush Ghut, Johnson Ghut......etc. These ghuts must be kept clean and unobstructed. A permit should be required to fill in any ghut; this is to ensure there are proper work around or diversion of flow.
Moreover, in low lying city(s) and residential areas, a drainage system must be designed and constructed to collect, convey and discharge surface runoff out to sea. Additionally, the system must be designed and constructed to prevent and/or minimize the “spread” on two lane roads (one lane in each direction) that are standard in the BVI; minimizing the spread is essential for smooth traffic flow. Further, roads must be designed and constructed to prevent “ponding” on roads; ponding accelerates road deterioration, increasing ownership cost.