Chapter 15 — The First Real Storm
TAMSIN
Rain reached Alder Street from the south-west, hard enough to erase the opposite river wall.
Tamsin stood beneath the number-six stairwell with a gauge clipped to the rail and watched the first runoff darken the paving.
Water travelled along the repaired fall, crossed the dye-test marks and entered the shallow channel.
The willow panels bent in the wind but allowed it through. None of their straps moved.
“Upper inlet taking flow,” Maeve said through the radio.
“Outlet clear,” Mr Bell answered from the lower bed.
He had purchased his own radio and labelled it RESERVE DRAINAGE.
Farah moved between the ground-floor flats checking thresholds and keeping children inside.
Four resident volunteers waited in the community room with gloves, drain hooks and the maintenance map taped to the wall.
Tamsin had divided the site into observable points rather than giving everyone the same instruction.
If the system failed, she needed to know where the water stopped first.
The gauge passed its first mark. The planted channel filled, darkening the clean substrate while the sealed base held the contaminated soil below it. The outlet released into the old surface drain.
“Number six dry,” Farah called.
Then Maeve’s voice changed. “Debris at the upper inlet. More coming.”
Leaves and food wrappers washed from the access lane. Maeve cleared the first grate, and Tamsin sent Celia up with a second hook. Water spread across the raised bed until the sedges flattened and the channel reached its designed storage depth.
Then the outlet stopped.
Mr Bell lifted the grate. “Nothing on top.”
Tamsin ran downhill. Water stood motionless beneath the open section. A blockage had formed inside the short connection to the old drain, beyond the reach of the hand hook.
“Number six?” she called.
Farah checked. “Water at the step. Not over.”
The trial had storage for another six minutes at the current intensity. The old drain connection could be cleared with rods, but the rods were in the shop van across the courtyard. Opening the service cap would release water onto a bare corner where petroleum contamination sat below cracked paving.
Tamsin looked at the maintenance map. The raised bed’s eastern end had twelve centimetres of spare wall height. Beyond it, the paved route fell towards the centre courtyard and away from all thresholds. Her planting plan placed three iris clumps across that edge.
“Maeve, leave Celia at the inlet. Bring the flat shovel and two channel boards.”
“What are we opening?”
“The east end of the bed.”
“That’s outside the trial outlet.”
“It is now the overflow.”
Maeve arrived in less than a minute. Tamsin lifted the iris clumps while Maeve cut a narrow notch through the clean substrate. They did not break the marker layer or dig into old ground. Two removable boards formed a lined chute from the notch across the paving.
“This will scour the bed,” Maeve said.
“Yes.”
“And drown the iris.”
“They are already out.”
Tamsin removed the last edging section. Stored water found the lower opening and moved through it with enough force to pull loose substrate behind. Maeve dropped a mesh bag of washed stone into the notch to slow the flow. The chute carried the overflow towards the central low point.
“Number six falling,” Farah called.
Tamsin watched the direction, not the speed. The water crossed the paving, missed the bare contaminated corners and spread below the unused bicycle rack. It had somewhere to stand without entering a home.
“Volunteers to the centre,” she said. “Keep the route free. Nobody lifts paving. Nobody digs.”
Mr Bell brought his broom.
The system now operated in a form that had never appeared on a drawing. Maeve and Celia kept the upper grates clear. Mr Bell pushed litter away from the chute. Farah checked thresholds while Tamsin moved between the blocked outlet and the new opening.
The centre courtyard became a broad shallow pool.
When an upper downpipe separated, roof water began cutting towards bare contaminated ground.
Celia brought the spare board; Mr Bell braced it beneath the pipe, and they sent the jet back through the planted bed and out by the sacrificed iris.
Tamsin added the broken joint to the permanent defects.
The blockage inside the old connection shifted once, released a dark surge and caught again. Tamsin did not depend on it.
The willow screens bowed lower. One rod snapped, but the short panel remained fixed and no part fell towards the channel.
At fifty-seven minutes, the rain weakened.
The central pool began to shrink. Water continued through the improvised overflow until the bed dropped below the notch. Number six remained dry behind the step. No basement alarm had sounded.
Tamsin waited another ten minutes before saying the immediate risk had passed.
Nobody cheered. The volunteers were wet, cold and occupied with lifting litter from water that smelled of diesel and leaves. Success required another hour of cleaning, measurements and checking that contaminated soil had not been exposed.
Maeve found the blockage with the rods. A plastic carrier bag had wrapped around a rough joint inside the old connection, trapping leaves behind it. She pulled the mass free and laid it on the waste sheet.
“Not our drain,” Mr Bell said.
“Our water reaches it,” Tamsin replied.
She recorded the failure without reducing responsibility to ownership.
The full design would need a larger inspection chamber before the old connection, a permanent safe overflow and greater storage at the central low point.
The three iris clumps could return elsewhere.
The trial bed edge would not be rebuilt as drawn.
Maeve downloaded the gauge readings. The improvised route had carried the excess, but the central pool drained too slowly even after the old connection cleared. That delay belonged in the next phase; a dry threshold did not make standing water harmless.
Farah joined her beneath the stairwell. Rain ran from the edge of her hood.
“Did it work?”
“The bed stored water. The outlet connection failed. The improvised overflow protected the thresholds.”
“That sounds like three answers.”
“It is.”
“The committee will want one.”
Tamsin looked across the courtyard. Mr Bell and Maeve were lifting the final grate while Celia counted used waste bags.
“The trial protected the homes because people changed it when the outlet failed.”
Farah nodded. “Use that one.”
Back at Leith Groundworks, Tamsin hung wet coats above trays to keep dripping away from the cuttings. Of the six cestrum cuttings, two remained firm. The layered branch had dropped every leaf but showed green beneath the bark. It was alive, which did not mean it would establish.
Maeve entered the storm figures while Tamsin priced the permanent changes.
Inspection chamber. Overflow route. Central storage.
Replacement substrate at the scoured notch.
Resident training hours. Twice-yearly contamination check.
The full riverbank scheme would require phased work across three courtyards and a budget far beyond the trial.
At six, Farah asked them to return to Alder Street.
The resident committee sat around pushed-together tables. Wet gloves dried on the radiator. Mr Bell had drawn the improvised overflow on a photocopy of the maintenance map and labelled it THE PART THAT WASN’T THERE.
“Accurate,” Tamsin said.
Farah placed a draft commission letter on the table. “The city fund will release one hundred and eighty-six thousand pounds across two phases. The committee recommends Leith Groundworks, subject to three conditions.”
Tamsin read them.
Resident maintenance hours had to be paid within the project budget.
Maeve had to remain a named site lead or be replaced by someone approved through the same process.
Every design change affecting contaminated ground or threshold protection required a plain-language site session before installation.
No condition mentioned Calder Meridian, her marriage or the heritage award.
“The fee schedule assumes two employees,” Tamsin said.
“Can you staff it?” Farah asked.
Tamsin calculated wages, insurance, equipment and the cash gap before the first phase payment. The commission could support Maeve for six months and one additional technician during installation if Tamsin did not take the full director draw in month one. After that, the margin became real.
“Yes,” she said. “With the first phase paid on appointment, not thirty days after.”
Farah looked to the committee. Mr Bell raised one hand.
“Half on appointment,” he said. “The rest on the agreed milestones. We have also learned not to ask small companies for free credit.”
Tamsin altered the payment line. Farah initialled it. The committee chair signed, then passed the letter across the table.
Tamsin signed for Leith Groundworks.
Maeve leaned close enough to read the final figure. “Do I still have thirty-two hours?”
“No.”
Maeve’s face closed for half a second.
“You have a six-month contract if you want it,” Tamsin said. “Paid mapping included.”
“You could lead with that.”
“I am learning to delegate suspense.”
Maeve laughed, and the residents began stacking chairs.
Outside, water still moved along the temporary chute in a thin clear ribbon. Tamsin checked number six before leaving. The threshold was dry. Mr Bell’s two towels remained folded on the inside sill, unused.
She did not take them as proof that the design had been right. The design had been incomplete. What held was the network of people able to see the failure and change the route before the water entered a home.
Tamsin folded the signed commission letter into her waterproof folder and carried it back to her own address.