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Home My WebLink About02062025 BSC Agenda Item 3 City of West University Place Alternatives for Permeable Driveways 6/25/2024 Pervious Concrete General Description: Pervious concrete is a porous material that is made from a mixture of stones and concrete. It is a Portland cement-based, rigid permeable pavement that serves as the surface layer of a stormwater management system, acting as a water filtration system. Beneath the pervious concrete is the second layer of stormwater system,the base rock, which is an open-graded, stone layer that is used for temporary stormwater detention.When rain falls,the pervious concrete allows on-site infiltration of stormwater. It also filters sediments and pollution from stormwater deposited on the pavement surface. Pros: - Pervious concrete has a similar look and feel to concrete but water can easily permeate. - Surface is ADA-compliant and meets EPA stormwater regulations. Cons: - Requires maintenance to keep sediment from accumulating in the pores. Sediment accumulation will impact the permeability of the concrete. - Because this permeable surface is a filter, like any filter it must be cleaned periodically. Cleaning is performed by vacuuming to remove sediments that have accumulated.The frequency of the vacuuming is directly related to the amount of sediment that the surface receives over time. - Sometimes the accumulation of sediment can be too deep for repairs causing it to become impermeable and in need of replacement. Example: �} lir*" 111 Yi ''A�(k t� � d g Permeable Pavers General Description: Permeable pavers are interlocking pavement systems that allow water to flow into layers of aggregate underneath. Pavers are spaced with a gap between units which allows infiltration of water.The pavers can be made into any arrangement and include a wide range of possible material options. The permeable paver section typically includes base stabilization, 6"to 8" of clear open-graded stone, pavers set on top with an open graded stone chip material as jointing infill. Depending on paver type, an edge restraint or concrete curb would be placed on both sides of the driveway. Pros: - Easily made ADA compliant if pavers are less than 1/2-inch apart. - Large variety of paver options and patterns. - Ease of maintenance and repairs. Pavers can be easily removed and reinstated, utility cuts can be completed without affecting the pavement life (no patches), and surface cleaning can be completed with standard vacuuming equipment. Cons: - Could experience damage in freezing temperatures due to water expansion. - Because of the open nature of the surfaces, permeable pavements clog with sediment and debris over time,thereby decreasing the infiltration rate.The rate of decrease depends on sources of deposited sediment. Routine inspections should take place to document surface clogging. Maintenance includes vacuum-sweeping to remove sediment. Examples: ECO-OPTILOCT"Permeable Pavers I Unilock Ontario ECO-PRIORATM PREMIER Pavers, Permeable Pavers Ontario I Unilock Porous/Permeable Concrete Pavers&Pavement I PowerBlock I Ecoraster I Houston,Austin.San Antonio. Dallas, New Orleans I Construction EcoServices Permeable Pavers for Patio or Driveway I Belgard �i wn /J L -11 1111i r 1 . .,. '� 1\- Turf Pavers General Description: Concrete pavers which allow for natura grass to grow between the individual stones. Allows rainwater to filter through the bricks into the soil. Suitable for low-vehicular use areas that need structural strength but benefit from the appearance of green space.Typically include 40-percent open design. Turf pavers usually include an uncompacted subgrade soil, optional geofabric, underdrain (as required), open-graded subbase reservoir, open-graded bedding course, and concrete pavers(which can be infilled with grass or a permeable joint material) Pros: - The grid reinforces structural integrity of the grass and reduces mud accumulation. - Effectively reduces the heat island effect because the grass fully absorbs and uses the heat instead of reflecting it. - ADA compliant - Natural finish which increases green space - Helps with erosion and preserving the soil underneath Cons: - Requires regular maintenance such as weeding, mowing, and watering.This is not the best option for drought prone areas. - The grid increases the load bearing capacity of the grass, but this type of surface is not suitable for high-traffic areas. Examples: TURFSTONE1M Pavers, Permeable Pavers Ontario I Unilock TurfStone Pavers For Driveways&Patios I MutualMaterials.com J 4 * NM NM F = .: '�) " w" W �`.�� may '..r �ry t fi a S ,# ,..a r , - -.,- yg �y a a �' T * a DIY . F: .. �.x M' ; "•.», i . . I -, 4 i ilp ,ii. ,, ft ,,,, ..... i : , '. ' #E„ Gravel Pave-Permeable Plastic Grid with Gravel General Description: Gravel pave driveways include an even layer of gravel overlaid with 100% post-consumer recycled HDPE plastic grids that are filled and covered with more gravel. Gravel is typically 5/8"or 3 "fill rock. The type and amount of gravel is up to the customer, gravel can be layered on top of the grid to hide the look of the plastic grid. Plastic grid paver installation includes stabilized subgrade geofabric, base rock, plastic grid, and rock. Pros: - Robust surface for parking and driving while also effectively managing stormwater and runoff. - Variety of gravel options depending on desired finish look Cons: - The grids increase stability and prevent most erosion, but the top layer of gravel may need refilling over time. - Similar to the pervious concrete, sediment may accumulate which may impact the filtration of the water. Examples: Permeable Grass&Driveway Pavers I Gravel Pavers-TRUEGRID Pavers ,.., i ,. '4. 1 ,. i „ ,. trl s, 1 . , . 1 , , t, ill 4 , . ,, r y . ram' ' _ . ,. III'1 ms a.gY " ` �r+��`-an-s`.s "aw • c^ai '� " , �r �a.. ., . v PROPERTY LINE o J/4` RED I I'000 EXP. Jr. . I ACCESS STRIP OR APPROVED EQUAL WALK AT THIS AREA WILL WALK 00I1EL ED TO DRIVE CONCRETE WALK 4'-0" HAVE SAME THICKNESS AND ENTRANCE ON WIDE, *S QEC C cs al- AND REINFORCING AS APPROVED CENTERS 22CY' O C,. W i 120 :k(s DRIVE APPROACH hr•r5 c,� )/" ()J,, _ S` F—I—-T---I--f --T --I J/4` REDWOOD EXP. JT. II I I I II I I OR APPROVED EQUAL ILA-1---_I-- 1---I --I-----} _ 5„ AUN. SLAG THICK. 1 1 1 1 { _1_J__ L _J __L_ L_la_ /5 REF. BARS AT 20" 0C, I 2 I I I -1 p• /4 REF. BARS AT 16" O.C. CONTTNOU5 WA TER FLOW L ' _ I I - OR yJ BARS AT 12" O C. AfUST BE ararnrrsiuFD INT'--I-- I---I --I J.000 P.S.I. CONCRETE rltrTFR .'ENLACE ASPITAL T I 1 I I I I II • . uPON REMOVAL OF FORM f--I-- I —-1-— I-—— ——I-—-I —1—— ROLL DOWN RETURN I I I I I I I I �+ �` Q �v`' __ I _I_____1 -_I IF STREET CU1D,1.10 'REINFORCING / C''ox I I I I__ -_I DO NOT CUT, BEND BACK INTO DRIVE 18 I I I I 18 RETURN FOR BOND s -o' R I_—{_._ [__II ti_ I I I I BACK OF CURB - —/ '———— - -—--— * -E&CE 6F-PA-VINC L FACE OF riiRR i 1, 4 T To (",, i' \I no Lr•nlr PERMEABLE PAVING UNITS I TYPICAL INSTALLATION Permeable Paver SPECIFY(EX.CURE)PAVED TURF EDGE(E filled with 1/4 "-3/8" open graded stone 1 // (AASHTO#8 or#9): fill %" from top 1 1 2" of 1/4" -3/8" open graded stone I 1111111111 IlFillill 1=,. illUllIlli (AASHTO#8"or#9) ?=?_.r r`' :_ t.. .�-?`: -e1=•17- .: t Fw• -..cam � +=a' ti.1 .a•.e..._ im ..ar;:imo 'I !'l .eb:A -: 10.�'a�!4 :•-1"!:.0 "D 4 of 3/4 - 1 lb.r` `. -.. •r� f AP — e. ,.` •\� 1 .. . 1up,,-. •.._`. • :a•4 ��. .4~ i0d •- .��- -' open graded 1►svZ :r . _ 6P_ ,r g - a stone no fines j1 V• ii — (AASHTO #57) ..14•Pfrrlidekitriff. �� `�i wa �� 12" of 1 1/2„ ` t .51.�11/40 SM� ANIAIbrngliIN► % 3" open graded r ; ' / - i ' ,,� , ` i ; '_'�`� , �,�,`/�/I ,'�,;1 �� `� / `/ ` stone no fines / ` ' ' _ / ` . ` (AASHTO #1) Perforated Pipe Compacted Subgrade * If street higher, a sub-pump is required