June 6, 2012 Brian Reis, PE.  RPS Espey’s role in the planning process  Key state and federal requirements  Our unique water quantity and water quality.

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Presentation transcript:

June 6, 2012 Brian Reis, PE

 RPS Espey’s role in the planning process  Key state and federal requirements  Our unique water quantity and water quality challenges  Summary of additional things to consider as we move forward

 The suitability of areas for development will initially be identified through a mapping exercise to determine which areas are more restrictive than others. ◦ Statutory requirements/existing regulations ◦ Community values (quality of life, historic areas, cultural value) ◦ Environmental protection goals Most Restrictive Least Restrictive

 Drainage  Flood Control  Water Quality  Erosion Control  Other Environmental Protection Issues ◦ Environmental Flows ◦ Habitat Conservation (flora and fauna) ◦ Aquifer Protection ◦ Archeological ◦ Etc.

Stormwater Management & Environmental Protection Drainage Water Quality Flood Control Erosion Control Environmental Flows Habitat Conservation (flora and fauna) Aquifer Protection Archeological Etc.

HCP Policy MS4 Public  Storm Water Management Program ◦ Regulated by the TCEQ / MS4 Permit ◦ Control discharges of pollutants  Habitat Conservation Plan ◦ Required by the USFWS / Incidental Take Permit ◦ Identifies activities required to minimize impacts to threatened and endangered species

 Physical increases ◦ Peak flow rates ◦ Frequency of bank full conditions ◦ Stormwater pollution ◦ Sediment transport (aggradation) ◦ Etc.  Physical reductions ◦ Base flow ◦ Infiltration ◦ Sediment transport (degradation) ◦ Etc.

 100-year are to be conveyed / contained within ROW  Peak flow shall not cause increased inundation of any building or roadway for the 2-, 5, 10-, 25-, 50- or 100-year storms  Detention is required for the 2- and 25-year storms

 Development within the floodplain shall not increase the base flood elevation by more than 1 foot.  Development within the floodway shall not result in any increase in the base flood.  Floodplain alterations shall not create an erosive water velocity (> 6 fps) on- or off- site.

San Marcos

 One of the largest springs in TX  Recreation area  Home to several threatened or endangered species ◦ Texas Blind Salamander ◦ Fountain Darter ◦ Texas Wild Rice  Pending regulations ◦ EPA/TCEQ (MS4) ◦ USFWS (HCP)

 Limits on impervious cover ◦ Slopes (i.e. 25%) ◦ Special areas: Edwards Aquifer, SM River Corridor  WQ Zones and Buffer Zones  Discourages the use of enclosed storm sewer systems and promotes sheet flow / infiltration  Permanent Best Management Practices (BMPs) ◦ Edwards Aquifer - limits increase in TSS ◦ SM River Corridor – requires removal of lead, zinc, iron, TP, TN, TSS and fecal coliform

 Strong relationship between water quality and impervious cover  The most significant contributor to impaired streams is non-point source pollution.  Compact development approach accommodates more activity while consuming less space, in turn reducing overall imperious cover that helps to maintain watershed functions.

 Building compact, walkable, mixed-use communities can reduce the overall per capita amount of impervious cover in the watershed Impervious Cover Water Quality Density Water Quality

 Managing quality and quantity of stormwater  Protecting natural and cultural resources  Promoting development in appropriate places  Creating complete mixed-use communities …and many other things.

 RPS Espey’s role in the planning process  Key state and federal requirements  Our unique water quantity and water quality challenges  Summary of additional things to consider as we move forward