![Page 1: Leif Hauge, PE, P. Hydrologist Sr. Civil Engineer Waukesha ... · Sr. Civil Engineer. Waukesha County Land Resources Division • 1001 Wet detention • 1002 Site evaluation • 1003](https://reader034.vdocuments.net/reader034/viewer/2022052612/5f1060d97e708231d448d0a7/html5/thumbnails/1.jpg)
Leif Hauge, PE, P. HydrologistSr. Civil EngineerWaukesha County Land Resources Division
![Page 2: Leif Hauge, PE, P. Hydrologist Sr. Civil Engineer Waukesha ... · Sr. Civil Engineer. Waukesha County Land Resources Division • 1001 Wet detention • 1002 Site evaluation • 1003](https://reader034.vdocuments.net/reader034/viewer/2022052612/5f1060d97e708231d448d0a7/html5/thumbnails/2.jpg)
• 1001 Wet detention• 1002 Site evaluation• 1003 Infiltration• 1004 Bioretention• 1007 Infiltration trench• 1008 Permeable pavement• 1006 Proprietary sediment devices• 1005 Vegetated swales• S100 Compost
![Page 3: Leif Hauge, PE, P. Hydrologist Sr. Civil Engineer Waukesha ... · Sr. Civil Engineer. Waukesha County Land Resources Division • 1001 Wet detention • 1002 Site evaluation • 1003](https://reader034.vdocuments.net/reader034/viewer/2022052612/5f1060d97e708231d448d0a7/html5/thumbnails/3.jpg)
![Page 4: Leif Hauge, PE, P. Hydrologist Sr. Civil Engineer Waukesha ... · Sr. Civil Engineer. Waukesha County Land Resources Division • 1001 Wet detention • 1002 Site evaluation • 1003](https://reader034.vdocuments.net/reader034/viewer/2022052612/5f1060d97e708231d448d0a7/html5/thumbnails/4.jpg)
• Show soils, seasonally high groundwater level, and bedrock conditions to a minimum depth of 5 feet below the proposed bottom of the pond
• Minimum of two test pit or boring per pond.
• Characterize soils using both the USDA and USCS classification systems.
![Page 5: Leif Hauge, PE, P. Hydrologist Sr. Civil Engineer Waukesha ... · Sr. Civil Engineer. Waukesha County Land Resources Division • 1001 Wet detention • 1002 Site evaluation • 1003](https://reader034.vdocuments.net/reader034/viewer/2022052612/5f1060d97e708231d448d0a7/html5/thumbnails/5.jpg)
![Page 6: Leif Hauge, PE, P. Hydrologist Sr. Civil Engineer Waukesha ... · Sr. Civil Engineer. Waukesha County Land Resources Division • 1001 Wet detention • 1002 Site evaluation • 1003](https://reader034.vdocuments.net/reader034/viewer/2022052612/5f1060d97e708231d448d0a7/html5/thumbnails/6.jpg)
![Page 7: Leif Hauge, PE, P. Hydrologist Sr. Civil Engineer Waukesha ... · Sr. Civil Engineer. Waukesha County Land Resources Division • 1001 Wet detention • 1002 Site evaluation • 1003](https://reader034.vdocuments.net/reader034/viewer/2022052612/5f1060d97e708231d448d0a7/html5/thumbnails/7.jpg)
![Page 8: Leif Hauge, PE, P. Hydrologist Sr. Civil Engineer Waukesha ... · Sr. Civil Engineer. Waukesha County Land Resources Division • 1001 Wet detention • 1002 Site evaluation • 1003](https://reader034.vdocuments.net/reader034/viewer/2022052612/5f1060d97e708231d448d0a7/html5/thumbnails/8.jpg)
![Page 9: Leif Hauge, PE, P. Hydrologist Sr. Civil Engineer Waukesha ... · Sr. Civil Engineer. Waukesha County Land Resources Division • 1001 Wet detention • 1002 Site evaluation • 1003](https://reader034.vdocuments.net/reader034/viewer/2022052612/5f1060d97e708231d448d0a7/html5/thumbnails/9.jpg)
![Page 10: Leif Hauge, PE, P. Hydrologist Sr. Civil Engineer Waukesha ... · Sr. Civil Engineer. Waukesha County Land Resources Division • 1001 Wet detention • 1002 Site evaluation • 1003](https://reader034.vdocuments.net/reader034/viewer/2022052612/5f1060d97e708231d448d0a7/html5/thumbnails/10.jpg)
Sites shall be tested for depth to groundwater, depth to bedrock and percent fines information to verify any exemption and exclusion
![Page 11: Leif Hauge, PE, P. Hydrologist Sr. Civil Engineer Waukesha ... · Sr. Civil Engineer. Waukesha County Land Resources Division • 1001 Wet detention • 1002 Site evaluation • 1003](https://reader034.vdocuments.net/reader034/viewer/2022052612/5f1060d97e708231d448d0a7/html5/thumbnails/11.jpg)
Soil profile descriptions must be written inaccordance with the descriptive procedures, terminology and interpretations found in the Field Book for Describing and Sampling Soils, USDA, NRCS, 1998
![Page 12: Leif Hauge, PE, P. Hydrologist Sr. Civil Engineer Waukesha ... · Sr. Civil Engineer. Waukesha County Land Resources Division • 1001 Wet detention • 1002 Site evaluation • 1003](https://reader034.vdocuments.net/reader034/viewer/2022052612/5f1060d97e708231d448d0a7/html5/thumbnails/12.jpg)
![Page 13: Leif Hauge, PE, P. Hydrologist Sr. Civil Engineer Waukesha ... · Sr. Civil Engineer. Waukesha County Land Resources Division • 1001 Wet detention • 1002 Site evaluation • 1003](https://reader034.vdocuments.net/reader034/viewer/2022052612/5f1060d97e708231d448d0a7/html5/thumbnails/13.jpg)
Correction factor is ratio of infiltration rates of soil at basin bottom and least-permeable layer below
![Page 14: Leif Hauge, PE, P. Hydrologist Sr. Civil Engineer Waukesha ... · Sr. Civil Engineer. Waukesha County Land Resources Division • 1001 Wet detention • 1002 Site evaluation • 1003](https://reader034.vdocuments.net/reader034/viewer/2022052612/5f1060d97e708231d448d0a7/html5/thumbnails/14.jpg)
![Page 15: Leif Hauge, PE, P. Hydrologist Sr. Civil Engineer Waukesha ... · Sr. Civil Engineer. Waukesha County Land Resources Division • 1001 Wet detention • 1002 Site evaluation • 1003](https://reader034.vdocuments.net/reader034/viewer/2022052612/5f1060d97e708231d448d0a7/html5/thumbnails/15.jpg)
Construction shall remain suspended if ponded water is present or if residual soil moisture contributes significantly to the potential for soil smearing, clumping or other forms of compaction
![Page 16: Leif Hauge, PE, P. Hydrologist Sr. Civil Engineer Waukesha ... · Sr. Civil Engineer. Waukesha County Land Resources Division • 1001 Wet detention • 1002 Site evaluation • 1003](https://reader034.vdocuments.net/reader034/viewer/2022052612/5f1060d97e708231d448d0a7/html5/thumbnails/16.jpg)
The basin shall be brought on-line when the area draining to the basin has achieved 90% build out of all lots in any of the first 3 years or 75% build outin any subsequent year
![Page 17: Leif Hauge, PE, P. Hydrologist Sr. Civil Engineer Waukesha ... · Sr. Civil Engineer. Waukesha County Land Resources Division • 1001 Wet detention • 1002 Site evaluation • 1003](https://reader034.vdocuments.net/reader034/viewer/2022052612/5f1060d97e708231d448d0a7/html5/thumbnails/17.jpg)
Effects of compaction shall be mitigated with:• two inches of
compost mixed into two inches of topsoil
• a chisel plow or rotary device with the capability of reaching to 12 inches
![Page 18: Leif Hauge, PE, P. Hydrologist Sr. Civil Engineer Waukesha ... · Sr. Civil Engineer. Waukesha County Land Resources Division • 1001 Wet detention • 1002 Site evaluation • 1003](https://reader034.vdocuments.net/reader034/viewer/2022052612/5f1060d97e708231d448d0a7/html5/thumbnails/18.jpg)
All draw down devices in the pond shall be opened during winter months to discourage infiltration of runoff water containing high levels of chlorides
![Page 19: Leif Hauge, PE, P. Hydrologist Sr. Civil Engineer Waukesha ... · Sr. Civil Engineer. Waukesha County Land Resources Division • 1001 Wet detention • 1002 Site evaluation • 1003](https://reader034.vdocuments.net/reader034/viewer/2022052612/5f1060d97e708231d448d0a7/html5/thumbnails/19.jpg)
![Page 20: Leif Hauge, PE, P. Hydrologist Sr. Civil Engineer Waukesha ... · Sr. Civil Engineer. Waukesha County Land Resources Division • 1001 Wet detention • 1002 Site evaluation • 1003](https://reader034.vdocuments.net/reader034/viewer/2022052612/5f1060d97e708231d448d0a7/html5/thumbnails/20.jpg)
• Required when design infiltration rate of native soil <3.6 in/hr
![Page 21: Leif Hauge, PE, P. Hydrologist Sr. Civil Engineer Waukesha ... · Sr. Civil Engineer. Waukesha County Land Resources Division • 1001 Wet detention • 1002 Site evaluation • 1003](https://reader034.vdocuments.net/reader034/viewer/2022052612/5f1060d97e708231d448d0a7/html5/thumbnails/21.jpg)
• If compaction occurs, soil shall be refractured to a depth of at least 12 in.
• If smearing occurs, correct by raking or roto-tilling
![Page 22: Leif Hauge, PE, P. Hydrologist Sr. Civil Engineer Waukesha ... · Sr. Civil Engineer. Waukesha County Land Resources Division • 1001 Wet detention • 1002 Site evaluation • 1003](https://reader034.vdocuments.net/reader034/viewer/2022052612/5f1060d97e708231d448d0a7/html5/thumbnails/22.jpg)
![Page 23: Leif Hauge, PE, P. Hydrologist Sr. Civil Engineer Waukesha ... · Sr. Civil Engineer. Waukesha County Land Resources Division • 1001 Wet detention • 1002 Site evaluation • 1003](https://reader034.vdocuments.net/reader034/viewer/2022052612/5f1060d97e708231d448d0a7/html5/thumbnails/23.jpg)
• Site evaluation per 1002 std required (~1 test / 1,000 l.f.)
• Pollutant removal mechanism is infiltration• Kswale = ½ * Kstatic• Mitigate for compaction by amending soil and /
or chisel plowing• New vegetative filtration standard being
developed
![Page 24: Leif Hauge, PE, P. Hydrologist Sr. Civil Engineer Waukesha ... · Sr. Civil Engineer. Waukesha County Land Resources Division • 1001 Wet detention • 1002 Site evaluation • 1003](https://reader034.vdocuments.net/reader034/viewer/2022052612/5f1060d97e708231d448d0a7/html5/thumbnails/24.jpg)
• Soil type as part of source area parameters –impervious surfaces draining to undeveloped areas
• Soil type as part of BMP parameters – default infiltration rates for basins, swales
![Page 25: Leif Hauge, PE, P. Hydrologist Sr. Civil Engineer Waukesha ... · Sr. Civil Engineer. Waukesha County Land Resources Division • 1001 Wet detention • 1002 Site evaluation • 1003](https://reader034.vdocuments.net/reader034/viewer/2022052612/5f1060d97e708231d448d0a7/html5/thumbnails/25.jpg)
![Page 26: Leif Hauge, PE, P. Hydrologist Sr. Civil Engineer Waukesha ... · Sr. Civil Engineer. Waukesha County Land Resources Division • 1001 Wet detention • 1002 Site evaluation • 1003](https://reader034.vdocuments.net/reader034/viewer/2022052612/5f1060d97e708231d448d0a7/html5/thumbnails/26.jpg)