New Construction in Pasadena, With Water Caught Above the House
New houses in Pasadena with uphill runoff caught before it reaches the walls, roof water piped clear, and ember-ready gutters where parcels are mapped.
Water comes at a new Pasadena house from 2 directions when the lot has fall: down onto the roof, and across the ground from uphill. The roof's share runs to gutters and closed pipe. The uphill share has to be stopped before it reaches the back wall, with a lined swale at the surface and an interceptor drain below it, both carried around the house to a discharge point that will not wash out the slope underneath.
Interceptor drains and the discharge point
An interceptor is a trench across the uphill side, lined with filter fabric, filled with clean gravel around a perforated pipe, and capped with soil or a concrete swale. It catches water moving through the upper soil before it can soak the ground beside the foundation. The pipe falls steadily to solid pipe at each end, with cleanouts where it turns. Where it finally lets go, the outlet sits on a rock pad or a splash structure that slows the flow, and the drainage plan shows that point so the reviewer can confirm it does not send water onto a neighbor or a slope face.
Gutters and roof edges on mapped parcels
Parts of Pasadena lie in mapped fire hazard zones, and a new house on one of those lots meets the state's ember rules at the roof edge as much as anywhere. Gutters there must have a way to keep leaves and needles from collecting, so a metal mesh guard is fitted, and we build the gutter itself in metal. The roof covering is a Class A assembly, eave and attic vents are listed for ember resistance, and any open ends under tile at the eave are closed so embers cannot slip under the roofing. On a parcel off the maps, the same guard still keeps downspouts clear for the drainage plan.
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Drainage design needs to know where water already goes, so the topographic survey maps contours on the uphill neighbor's side of the line as far as access allows. The soils report adds any seepage or perched water seen in the borings and says whether infiltration is safe on the lot. The parcel's fire hazard status is looked up at the same time, since it changes the roof edge.
On a mapped Pasadena parcel, the fire department reviews how its engines would reach a new house, and the answer can add to the build: a wider or stronger driveway, a turnaround at the top, or a hydrant brought within reach. Those items are site work, priced with grading, and they are agreed with the fire department before the site plan is fixed.
Pricing works once the civil engineer's grading and drainage plan travels with the architect's set. Architectural sheets often show downspouts and leave the rest to the civil sheet, and that sheet holds the interceptor, the pipe runs, the outlet and any retaining wall drains. Without it, drainage goes in as a named allowance sized from the roof area and the uphill ground.
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