Download - New Braunfels Stormwater Management Strategy
New Braunfels Stormwater Management StrategyNew Braunfels, Texas
Phase I ReportMarch 2012
| iii
ContentsStaff Kick Off � � � � � � � � � � � � � � � � � � � � � � � �2
Key Findings � � � � � � � � � � � � � � � � � � � � � � � �2
Watershed Advisory Council � � � � � � � � � � � � 2
Project Site Tour � � � � � � � � � � � � � � � � � � � � � �3
Key Findings� � � � � � � � � � � � � � � � � � � � � � � � �3
Goals and Metrics � � � � � � � � � � � � � � � � � � � �4
Existing Conditions � � � � � � � � � � � � � � � � � � � �7
Existing Code and Planning Documents � � 37
Document Summaries � � � � � � � � � � � � � � � �37
DCM Review � � � � � � � � � � � � � � � � � � � � � � �40
Phase I | 1
IPhase I Report
New Braunfels Stormwater Management Strategy | New Braunfels, Texas2 | Phase I
Staff Kick OffA staff kick off was held on January 12, 2011� Representatives from Design Work-shop, LAN and the City were there� City officials present included the representative from City Manager, Planning, Engineering, Building, Public Works, and River Activities departments�
The agenda covered 1� Vision and Critical Success Factors
2� Study Area Boundary
3� Project Management Plan
4� Final Deliverables
5� Metrics
6� Immediate Policy Changes
7� Public Engagement Plan
8� Watershed by Watershed Issues
Key Findings Key findings that came out of the Staff Kick Off included:
• Vision is for a state of the art stormwa-ter management plan that is practical, economical, and forward thinking�
• Stormwater planning goes beyond city limits and is driven by watershed bound-aries� Strategies need to work for this geographic range�
• Specific watersheds with concerns include: • Alligator and Geronimo Creek | There
are many approved but unbuilt subdi-visions with no water quality mecha-nisms in place, even with 303d listing for e-coli and phosphorous�
• Dry Comal | Testing indicates e-coli levels should continue to be moni-tored and Best Management Practices
(BMP’s) developed to maintain levels below appropriate recreation stan-dards�
• Comal | Springs, lakes , mill race and river have endangered species issues and river recreation issues�
• Old Channel of the Comal | Tourism relies on this waterway and water quality is critical for tourism and en-dangered species�
• Blieders Creek | This watershed out-falls at Landa Lake� There is a large development working through the City that would greatly impact this water-shed, which is already suffering from erosion and sedimentation�
• Guadalupe | There is various infra-structure that relies on this watershed, including surface water plant and recreation�
• The immediate policy changes include establishing drainage improvement plans that are bonded by developer for two years and construction of drain-age improvements sufficient to mitigate development as it occurs�
• In May 2011, City Council increased mitigation through detention retention or some other technique must be de-signed, constructed and maintained to reduce the post-development discharge to below that of pre-development for the 2-year, 10-year, 25-year and 100-year design storms� Participation in neighbor-hood or regional mitigation is an accept-able option� The stormwater master plan should support this�
• Public engagement needs to include key stakeholders who have water rights on the rivers, like Schlitterbahn, as well as the general public�
• The Watershed Advisory Committee, or steering committee, needs to be made up of a diverse group of people and will play a critical role in the review of the Stormwater Management Plan, Drain-age Criteria Manual and the Federally Mandated Municipal Separate Storm Sewer (FM MS4) Permit process� They may or may not be a long term water-shed advisory group�
Project Kick Off
Phase I | 3
Watershed Advisory CommitteeThe selection of the Watershed Advisory Committee (WAC) began in February 2011 and continued through June 2011� The schedule and progress of the plan was adjusted to accommodate the appointment of the WAC�
Project Site TourOn July 12th, WAC, City of New Braunfels, Design Workshop and LAN participated in a site tour looking at stormwater issues and opportunities around the City� The site tour included the following:
• Review of green infrastructure manage-ment practices using native lowland prairie, wetland benches and wet ponds as a form of water quality and water quantity needs for a retail project�
• Review of traditional stormwater man-agement practices of water quality and water detention ponds in a residential development currently under construc-tion�
• Review of New Braunfels Utilities site conditions and adjacent runoff near one of the Comal Springs with endangered species�
• Review of Landa Park, associated springs, Panther Canyon and human im-pact to water edge conditions including discussions of the impact to Landa Park after the June 2010 storm event�
• Review of the Dry Comal and adjacent development impact to water quality including discussions on e-coli levels and the creek assessment completed by LAN and Design Workshop in the spring of 2010�
These five reviews offered the WAC an op-portunity to see firsthand a variety of storm-water issues and opportunities that play a role in the economic, environment, commu-nity and aesthetic value in the community�
Key FindingsDuring the tour, it was observed that storm-water management has to consistently be analyzed at a macro and micro scale, from regional to site specific solutions. Also observed was the need to understand is-sues associated with stormwater quality and stormwater quantity as it relates to New Braunfels, since the natural beauty plays such a significant role in the recreational tourism but also the health and safety of the community�
Project Site Tour
New Braunfels Stormwater Management Strategy | New Braunfels, Texas4 | Phase I
harmony are enduring places that make a difference in society, the well being of the planet and leave a legacy for future genera-tions�
Each goal has one or multiple metrics that are used to measure progress toward the goal� Each metric has a baseline and target to create the foundation of the measure-
Project Goals and Metrics
Goal Metric Target/ Objective BaselineEncourage develop-ment patterns that improve stormwater management oppor-tunities�
Metric 1: Woodlands and Grasslands
Target: Increase the acreage of woodland or grasslands designated for stormwater management in the study area by X%�
CityTotal percentage of the study area in Woodland = 10�95% (3104�1 ac)Total percentage of the study area in Grassland = 33�5% (9536�37 ac)WatershedTotal percentage of the study area in Woodland = 29�8% (99544�2 ac)Total percentage of the study area in Grassland = 38�5% (128658�7 ac)
Metric 2: Floodplain and Stream Setback
Target: 100 % of the flood-plain is designated as open space or parkland� 100% of the stream setback is protected with no buildings in the stream setback�
CityTotal percentage of the floodplain protected = 94�5% (253�3 ac)Total percentage of the stream set-back protected = 93�2% (1150 ac)WatershedTotal percentage of the floodplain protected = 99�1% (16297 ac)Total percentage of the stream set-back protected = 97�3% (9177 ac)
Metric 3: Com-pressed Development
Target: Increase density in areas that are appropri-ate for development x% higher than the rest of New Braunfels�
City CoreAverage density of block groups in the city core = 2�0 units/ acreCityAverage density of city = 1�2 units/ acreWatershedAverage density of watershed study area outside the city limits = �2 units/ acre
Goals and MetricsGoals for the Stormwater Management Plan are in line with DW Legacy Design® methodology that creates special places that meet today’s needs, and are sustainable en-vironments for all time� This process seeks to imbue every project with the perfect balance between environmental sensitivity, community connections, artistic beauty and economic viability� Projects that achieve this
Phase I | 5
Through the establishment of goals and metrics in each of the four Legacy catego-ries, the Stormwater Management Plan will meet the vision of a plan that is practical, economical and sustainable�
Project Goals and Metrics
Goal Metric Target/ Objective BaselineMinimize impervious surfaces
Metric 4: Impervious Surfaces
Target: Reduce impervious surface area per parcel�
Target: Have a ratio of im-pervious surface per person below the average of other cities at a similar density to New Braunfels�
CityAverage impervious cover per par-cel within City Limits= 26%
Pervious surface / person in the City Limits = 0�037 acresPeople / acres in the City Limits = 2�6
Prevent flooding and erosion caused by stormwater runoff�
Metric 5: Flooding Target: Reduce structures within the 100-year flood-plain and eliminate ALL structures in the floodway. Prevent all future structures from developing in the flood-plain�
City Number of structures in the FEMA 100 year flood plain = 560Number of structures in the flood-way = 315
Metric 6: Erosion Target: Increase amount of stabilized stream banks�
CityTotal miles of river or creek bank = 35 milesWatershedTotal miles of river or creek bank = 496 miles
Protect water quality of receiving waters particularly the streams and Landa Lake�
Metric 7: Pollutant Total Load Reduction
Target: Reduce measured pollutants�
TBD
Ensure construc-tion does not cre-ate environmental degradation (even on a temporary basis)�
Metric 8: Construc-tion Activity Pollution Prevention
Target: The plan must conform to the erosion and sedimentation requirements of the TCEQ storm water permit for construction� In addition to statewide require-ments, plan must also follow Edwards Aquifer Protection Program requirements when in the Edwards�
TBD
ment� The baseline is the existing condition of the study area� Targets for New Braunfels will be defined over the course of the project by looking at existing conditions, relevant case studies, third party sources (studies, rating systems, etc�) and public acceptance�
New Braunfels Stormwater Management Strategy | New Braunfels, Texas6 | Phase I
Project Goals and Metrics
Goal Metric Target/ Objective BaselineEnsure stakeholder buy-in on stormwater strategies�
Metric 9: Stakeholder Communication
Target: 80% of the partici-pants feel that there was a good public process with a diversity of viewpoints pres-ent�
TBD
Make sure responsi-bility for operations and management of stormwater infra-structure is clear�
Metric 10: Operations and Maintenance
Target: Develop a plan ensuring operations and maintenance of all stormwa-ter facilities�
TBD
Utilize parks and open space for stormwater storage and infiltration.
Metric 11: Parks/Open Space
Target: Increase stormwater facilities in parks and open space�
CityTotal park acreage = 583 acres of parkland�
Align the city’s tour-ism industry prac-tices with sensible stormwater manage-ment�
Metric 12: Tourism Industry Practices
Target: Create guidelines balancing the protection of the water quality and natural resources with ac-cess , specifically in areas of valued tourism such as Landa Park as an event space, the Guadalupe River as a water recreation site, the downtown as a heritage tourism attraction, the Comal River and Schlitterbahn as a family-oriented entertain-ment venue�
Number of Tourist Outfitters along the rivers and creeks = TBD
Develop stronger stormwater standards without stifling growth and development�
Metric 13: Incentives Target: Increase in the number of times the public incentive options are used�
City Number of existing incentives avail-able =
Ensure that public investment in infra-structure proves to have a positive ROI for the community�
Metric 14: Return on Public Investment
Target: Revenue per capita of the stormwater user-fee goes down�
TBD
Stormwater infra-structure should be visually pleasing�
Metric 15: Visual Ap-pearance
Target: Perception of the scenic quality of rivers and creeks increases
TBD
Ensure craftsman-ship of stormwater in-frastructure will result in permanence�
Metric 16: Durability Target: Structural material should have a life-cycle of at least 50 years�
TBD
Phase I | 7
Existing Conditions Maps
Existing ConditionsUsing GIS analysis, the existing conditions in the New Braunfels area watersheds were mapped and used as measuring tools for the baseline conditions of the Goals and Metrics�
Information collected included: • Watersheds• Land Use• Drainage (Digital Elevation Model and
Slope Analysis)• Impervious Surface• Parks and Open Space• Flooding• Aquifers• Land Cover and Vegetation• Soils
Information will continue to be collected based upon specific strategies recommend-ed for the Plan�
New Braunfels Stormwater Management Strategy | New Braunfels, Texas8 | Phase I
Existing Conditions Maps Existing Conditions Maps
o
SAN ANTONIO
SEGUIN
SAN MARCOS
SCHERTZ
LOCKHART
CIBOLO
WIMBERLEY
SELMA
TIMBERWOOD PARK
LIVE OAK
GARDEN RIDGE
CONVERSE
MCQUEENEY
UNIVERSAL CITY
UHLAND
DOMINION
KYLE
CANYON CITY
CASTLE HILLSWINDCREST
MARTINDALE
FISCHER
SHAVANO PARK
LEON VALLEY
LULING
HILL COUNTRY VILLAGEMARION
HOLLYWOOD PARK
CROSS MOUNTAIN
NEW BERLIN
FAIR OAKS RANCH
NIEDERWALD
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6
5
153
12
113
57
*A
CIBOLO CR YORK C R
PLUM C R
SALAD
O CR
SAN MARCOS R
GUADALUPE R
Mill
Cre
ek
Curry Creek
York Creek
Nash Creek
Allig ator Creek
BL AN
CO
R
SIN K CR
Geronimo Creek
PLUM CR, CLEAR F K
Mud C
re ek
PLUM CR, W FK
Carpe r s Creek
E lm Creek
DRY COMA
L CR
Bear Cr eek
Lo ng Creek
LEO
N C
R
Beite
l Cre
ek
Indian Creek
Lewis Creek
Panther Springs Creek
Wol f Cre ek
Cal
lihan
Cre
ek
Rebecca Creek
S a u l Creek
Boggy Creek
Youngs Cre ek
Isaa
c Cre
ek
Cypress Cree k
Dickerson Creek
Walnut B
ranch
Darst C
reek
High smith Creek
Potter Creek
Clear Fork
Walter C
reek
Hon
ey C
reek
Long
Bra
nch
Sm
ith Cre
ek
P leasant Valley Creek
Dry Branch
Sw
ine
Creek
Spr
ing
Bran
ch
Raw
ls Creek
Pant
her C
reek
Meuseb ach Creek
C
ordell Cree
k
Dry Bear Creek
Krause Creek
Hanz C
reek Mountain Creek
Can
tau C
reek
Saw
log
Cre
ek
Caney Creek
Dutch Branch
Ja
cobs C
reek
Ran
dolp
h C
reek
Bru
sh
y Creek
Santa Clara Creek
Olmos Creek
Dead
m an Creek
Rocky C
reekPin Oak Creek
Dry
San
ta C
lara
Cre
ek
Four
mile
Cr eek
Cot
to
nwood C
reek
Women Hollow Creek
Mesquite Creek
Buzz
ard
Cre
ek
Water Hole Creek
Schultz Creek
Turk
ey C
reek
Dee
p C
reek
Elm
Cre
ek
Elm Creek
Elm Creek
Elm C
reek
GUA
DALUPE R
Long Creek
Panther Creek
GUADALUPE RIVER BASIN
SAN ANTONIO RIVER BASIN
NEW BRAUNFELS
CANYON LAKE
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UV345
UV82
UV337
UV368
UV537
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UV123B
UV46C
STRATEGIC MASTER PLAN FOR THE PETRA REGION - Bird Habitat
NEW BRAUNFELS STORMWATER MASTER PLAN
Data Sources: City of New Braunfels, TX Natural Resources Information System, TX DOT, USGS, TCEQ, City of San Antonio
[0 20,000 40,000 60,00010,000Feet
REGIONAL WATERSHEDS - DRAFT 1.27.11
Watershed Boundary
Guadalupe River Basin
San Antonio River Basin
Watershed Study Area
Stream Segment
Dam
Counties
City of New Braunfels
Outlying Cities
New Braunfels ETJ
ETJ Outlying Cities
Municipal Waste Sites
Railroad
HAYS COUNTY
GUADALUPE COUNTY
KENDALL COUNTY
COMAL COUNTY
CALDWELL COUNTY
BLANCO COUNTY
BEXAR COUNTY
BULVERDE
GUADALUPE RIVER BASIN
SAN ANTONIO RIVER BASIN
COLORADORIVER BASIN
BRAZOSRIVER BASIN
NUECESRIVER BASIN
LAVACARIVER BASIN
SAN ANTONIO- NUECESCOASTAL RIVER BASIN
WATERSHED STUDY AREA
Phase I | 9
Existing Conditions Maps
o
32
6
5
153
12
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*A
CI BOLO C R YORK C R
PLUM C R
SALADO CR
SAN MARCOS R
GUADALUPE R
Mill
Cre
ek
Curry Creek
York Creek
Nash Creek
Allig ator Creek
BLA
NC
O R
SIN K CR
Geronimo Creek
PLUM CR, CLEAR F K
Mud C
re ek
PLUM CR, W FK
Carpe r s Creek
E lm Creek
DRY COMA
L CR
Bear Cr eek
Lo ng Creek
SAN ANT
ONIO R
LEO
N C
R
Beite
l Cre
ek
Indian Creek
Lewis Creek
Panther Springs Creek
Wol f Cre ek
Cal
lihan
Cre
ek
Rebecca Creek
S a u l Creek
Boggy Creek
Young s Creek
Isaa
c Cre
ek
Cypress Cree k
Dickerson Creek
Walnu t Branc h
Darst C
reek
High smith Creek
Potter Creek
Clear Fork
Elm Waterhole Creek
Walter C
reek
Hon
ey C
reek
Long
Bra
nch
Sm
ith Cre
ek
P leasant Valley Creek
Dry Branch
Sw
ine
Creek
Spr
ing
Bran
ch
Raw
ls Creek
Pant
her C
reek
Meuseb ach Creek
Salitrillo C reek C
ordell Cree
k
Dry Bear Creek
Krause Creek
Hanz C
reek Mountain Creek
Pierce
Cre
ek
Can
tau C
reek
Saw
log
Cre
ek
Caney Creek
Dutch Branch
Ja
cobs C
reek
Ran
dolp
h C
reek
Brushy Creek
Santa Clara Creek
Olmos Creek
Willow Sp rings Creek
Dead
m an Creek
Bunton Branch
Rocky C
reekPin Oak Creek
Dry
San
ta C
lara
Cre
ek
Four
mile
Cr eek
Cot
to
nwood C
reek
Women Hollow Creek
Mesquite Creek
Buzz
ard
Cre
ek
Water Hole Creek
Schultz Creek
Turk
ey C
reek
Dee
p C
reek
Elm Creek
Elm
Cre
ek
Panther Creek
Elm Creek
Long Creek
Elm Creek
Elm C
reek
GUA
DALUPE R
Bru
sh
y Creek
SAN ANTONIO
SEGUIN
SAN MARCOS
SCHERTZ
TIMBERWOOD PARK
LOCKHART
CIBOLO
LIVE OAK
SELMA
WIMBERLEY
GARDEN RIDGE
CONVERSE
MCQUEENEY
UNIVERSAL CITY
UHLAND
DOMINION
KYLE
CANYON CITY
CASTLE HILLSWINDCREST
MARTINDALE
FISCHER
SHAVANO PARK
LEON VALLEY
LULING
HILL COUNTRY VILLAGE
MARION
HOLLYWOOD PARK
CROSS MOUNTAIN
NEW BERLIN
FAIR OAKS RANCH
NIEDERWALD
BALCONES HEIGHTS
CANYON LAKE
STRATEGIC MASTER PLAN FOR THE PETRA REGION - Bird Habitat
NEW BRAUNFELS STORMWATER MASTER PLAN
Data Sources: City of New Braunfels, TX Natural Resources Information System, TX DOT, USGS, State of Texas, TX Comm Env. Quality
[0 20,000 40,000 60,00010,000Feet SUB WATERSHEDS - DRAFT 1.27.11
Regional Watershed BoundaryStream SegmentDamCountiesCity of New BraunfelsOutlying CitiesMunicipal Solid Waste
JACOBS CREEK- GUADALUPE RIVER
UPPER YORK CREEK
MIDDLE YORK CREEK
ELM CREEK- GUADALUPE RIVER
BEAR CREEK
HEADWATERS WEST FORKDRY COMAL CREEK WEST FORK
DRY COMAL CREEK
ALLIGATOR CREEK
GERONIMO CREEKDRY COMAL RIVER-
GUADALUPE RIVER
UPPER SANTACLARA CREEK
YOUNGS CREEK-GUADALUPE RIVER
LONG CREEK-GUADALUPE RIVER
HAYS COUNTY
KENDALL COUNTY
COMAL COUNTYCALDWELL COUNTY
BLANCO COUNTY
BEXAR COUNTY
BULVERDE
GUADALUPE COUNTY
BLIEDER'S CREEK Blieder's Creek
Phase I | 11
Existing Conditions Maps
o
32
5
57
43
42
7
8
101
28G
UA DALUPE R
Alligator Creek
DR
Y C
OMAL CR
Elm
Cre ek
YORK CR
Geronimo Creek
Blieder's Creek
Long Creek
Fou
rm ile Cre e k
M esquite Creek
Panther Creek
West F
ork Dry Comal Creek
Water Hole Creek
§̈¦35
UV46
UV337
§̈¦35H
UV46C
STRATEGIC MASTER PLAN FOR THE PETRA REGION - Bird Habitat
NEW BRAUNFELS STORMWATER MASTER PLAN
Data Sources: City of New Braunfels, TCEQ, USGS, Comal County
[0 6,000 12,000 18,0003,000Feet
ELEVATION MODEL - DRAFT 1.27.11
Value
High : 19
Low : 1
Stream Segment
Dam
Counties
City Boundary
EJT Boundary
Municipal Solid Waste
Railroad
COMAL COUNTY
GUADALUPE COUNTY
Phase I | 13
Existing Conditions Maps
o
32
5
57
43
42
7
8
101
28G
UA DALUPE R
Alligator Creek
DR
Y C
OMAL CR
Elm
Cre ek
YORK CR
Geronimo Creek
Blieder's Creek
Long Creek
Fou
rm ile Cre e k
M esquite Creek
Panther Creek
West F
ork Dry Comal Creek
Water Hole Creek
§̈¦35
UV46
UV337
§̈¦35H
UV46C
STRATEGIC MASTER PLAN FOR THE PETRA REGION - Bird Habitat
NEW BRAUNFELS STORMWATER MASTER PLAN
Data Sources: City of New Braunfels, TX Comm. Env. Quality, USGS, Comal County
[0 6,000 12,000 18,0003,000Feet
SLOPE ANALYSIS - DRAFT 1.27.11
Slope Analysis
0-5%
5-10%
10-15%
15-20%
20-30%
>30%
Stream Segment
Dam
Counties
City Boundary
EJT Boundary
Municipal Solid Waste
Railroad
COMAL COUNTY
GUADALUPE COUNTY
Phase I | 15
Existing Conditions Maps
SAN ANTONIO
SEGUIN
ST. HEDWIG
LOCKHART
SCHERTZ
TIMBERWOOD PARK
CIBOLOLIVE OAK
GARDEN RIDGE
CONVERSE
SELMA
MCQUEENEY
UNIVERSAL CITY
KIRBY
DOMINION
LEON VALLEY
LULING
NEW BERLIN
CANYON CITY
CASTLE HILLS WINDCREST
MARTINDALE
ALAMO HEIGHTS
SHAVANO PARK
TERRELL HILLS
HILL COUNTRY VILLAGEMARION
HOLLYWOOD PARK
CROSS MOUNTAIN
FAIR OAKS RANCH
OLMOS PARKBALCONES HEIGHTS
CANYON LAKE
NEW BRAUNFELS
STRATEGIC MASTER PLAN FOR THE PETRA REGION - Bird Habitat
NEW BRAUNFELS STORMWATER MASTER PLAN
Data Sources: City of New Braunfels, TX Natural Resources Information System, TX DOT, USGS, State of Texas, TX Comm Env Quality
[0 21,000 42,000 63,00010,500Feet
HOUSING UNITS/ ACRE - DRAFT 08/25/11
Stream Segment
Watershed Study Area
Counties
City of New Braunfels
ETJ New Braunfels
Railroad
BULVERDE
2010 CensusTotal_Hous / Area
0.01196 - 0.4206
0.4207 - 1.026
1.027 - 1.778
1.779 - 2.574
2.575 - 3.558
Phase I | 17
Existing Conditions Maps
o
32
5
57
43
42
7
8
101
28G
UA DALUPE R
Alligator Creek
DR
Y C
OMAL CR
Elm
Cre ek
YORK CR
Geronimo Creek
Blieder's Creek
Long Creek
Fou
rm ile Cre e k
M esquite Creek
Panther Creek
West F
ork Dry Comal Creek
Water Hole Creek
§̈¦35
UV46
UV337
§̈¦35H
UV46C
STRATEGIC MASTER PLAN FOR THE PETRA REGION - Bird Habitat
NEW BRAUNFELS STORMWATER MASTER PLAN
Data Sources: City of New Braunfels, TX Comm. Env. Quality, USGS, Comal County
[0 6,000 12,000 18,0003,000Feet
EXISTING LAND USE - DRAFT 1.27.11
Commercial
Drainage
Government
High Den Res
Industrial
Institutional
Manuf Home Commercial
Mobile Home Park
Open Space
Res Low Density
Res Med Density
Resort
Schools
Stream Segment
Dam
Counties
City Boundary
EJT Boundary
Municipal Solid Waste
Railroad
COMAL COUNTY
GUADALUPE COUNTY
Phase I | 19
Existing Conditions Maps
o
SCHERTZ
GARDEN RIDGE
MCQUEENEYSEGUIN
SAN MARCOS
CIBOLO
YORK CR
GU
A D ALUPE R
A lligator Creek
Elm C
r eek
DRY COM
AL CR
Geronim o Creek
Be ar Cr e ek
Long C reek
Isaa
c Creek
CIBOLO CR
West Fork Dry C omal Creek
Dry Bear Creek
Mountain Creek
C aney Creek
Jaco
bs Creek
Blieder's Creek
Fourm
ile Cr eek
Lit tle B
ear C
reek
Santa Clara Creek
Mes quite Cre ek
Water Hole Creek
Turk
ey C
reek Dee
p Cre
ek
Walnut Branch
Panther Creek
Long Creek
CIBOLO CR
§̈¦35
£¤90
UV46
UV123
UV337 §̈¦35H
UV46C
UV123B
STRATEGIC MASTER PLAN FOR THE PETRA REGION - Bird Habitat
NEW BRAUNFELS STORMWATER MASTER PLAN
Data Sources: City of New Braunfels, TX NRIS, TX DOT, USGS, State of Texas, TCEQ
[0 10,000 20,000 30,0005,000Feet
FUTURE LAND USE - DRAFT 1.27.11
CemetaryComm IndCommercialDrainageGovernmentIndustrialInstitutionalManufactured HomesMixed useOpen SpacePrivate RecreationRes Low DenRes Med HighSchoolUtilitiesWatershed Study AreaCountiesCity of New BraunfelsNew Braunfels ETJETJOtherCitiesMunicipal Solid WasteRailroad
HAYS COUNTYCOMAL COUNTY
GUADALUPE COUNTY
Blieder's Creek
Phase I | 21
Existing Conditions Maps
o
32
5
57
43
42
7
8
101
28G
UA DALUPE R
Alligator Creek
DR
Y C
OMAL CR
Elm
Cre ek
YORK CR
Geronimo Creek
Blieder's Creek
Long Creek
Fou
rm ile Cre e k
M esquite Creek
Panther Creek
West F
ork Dry Comal Creek
Water Hole Creek
§̈¦35
UV46
UV337
§̈¦35H
UV46C
STRATEGIC MASTER PLAN FOR THE PETRA REGION - Bird Habitat
NEW BRAUNFELS STORMWATER MASTER PLAN
Data Sources: City of New Braunfels, TNRIS, TXDOT, USGS
[0 6,000 12,000 18,0003,000Feet
IMPERVIOUS SURFACES - DRAFT 1.27.11
Stream Segment
Dam
Counties
City Boundary
EJT Boundary
Municipal Solid Waste
Railroad
COMAL COUNTY
GUADALUPE COUNTY
Percent Imperviousness1% - 49%50% - 99%
100%
Phase I | 23
Existing Conditions Maps
Phase I | 24
Existing Conditions Maps
D RY COMAL CR
Alliga tor Creek
G
U A DALUPE R
YORK CR
Elm C
re
e k
Long Cre ek
West Fork Dr y Com al Creek
Ge ronimo Creek
Ca ney Creek
Blieder's C re ek
Fo
urmile C reek
Santa Clara Creek
Me squite Creek
Water Hole Creek
Waln ut B
ra nch
Little B ear C
reek
Panthe r Creek
NEW BRAUNFELS
STRATEGIC MASTER PLAN FOR THE PETRA REGION - Bird Habitat
NEW BRAUNFELS STORMWATER MASTER PLAN
Data Sources: City of New Braunfels, TX Natural Resources Information System, TX DOT, USGS, State of Texas, TX Comm Env Quality
[0 8,100 16,200 24,3004,050Feet
BUILDING FOOTPRINTS - DRAFT 08/25/11
Stream Segment
Counties
City of New Braunfels
BULVERDE
BuildingFootprints
Phase I | 25
Existing Conditions Maps
Phase I | 26
Existing Conditions Maps
Alligator Creek
D RY C
OM
AL C R
G
U A DALUPE R
YORK CR
Elm C
re
ek
Long Cre ek
Geronimo Creek
West Fork Dr y Com al Creek
C aney Creek
Blieder's Cr e ek
Fo
urmile C ree
k
Santa Clara Creek
Me squite Creek
Water Hole Creek
Waln ut B
ranch
Panthe r Creek
Little Be ar C
reek
NEW BRAUNFELS
STRATEGIC MASTER PLAN FOR THE PETRA REGION - Bird Habitat
NEW BRAUNFELS STORMWATER MASTER PLAN
Data Sources: City of New Braunfels, TX Natural Resources Information System, TX DOT, USGS, State of Texas, TX Comm Env Quality
[0 8,400 16,800 25,2004,200Feet
PARKS AND OPEN SPACE - DRAFT 08/25/11
Stream Segment
Counties
City of New Braunfels
BULVERDE
Parks_BNDY
Phase I | 27
Existing Conditions Maps
Phase I | 28
Existing Conditions Maps
o
32
5
57
43
42
7
8
101
28G
UA DALUPE R
Alligator Creek
DR
Y C
OMAL CR
Elm
Cre ek
YORK CR
Geronimo Creek
Blieder's Creek
Long Creek
Fou
rm ile Cre e k
M esquite Creek
Panther Creek
West F
ork Dry Comal Creek
Water Hole Creek
§̈¦35
UV46
UV337
§̈¦35H
UV46C
STRATEGIC MASTER PLAN FOR THE PETRA REGION - Bird Habitat
NEW BRAUNFELS STORMWATER MASTER PLAN
Data Sources: City of New Braunfels, TX Comm. Env. Quality, USGS, Comal County
[0 6,000 12,000 18,0003,000Feet
HYDROLOGY AND FLOODPLAINS - DRAFT 1.27.11
0.1 Pct Annual Chance Flood Hazard (100 - year)
Floodway
Flood Damaged Homes June 2010
Stream Segment
Dam
Counties
City Boundary
EJT Boundary
Municipal Solid Waste
Railroad
COMAL COUNTY
GUADALUPE COUNTY
Phase I | 29
Existing Conditions Maps
o
SAN ANTONIO
SEGUIN
SAN MARCOS
SCHERTZ
LOCKHART
CIBOLO
WIMBERLEY
SELMA
TIMBERWOOD PARK
LIVE OAK
GARDEN RIDGE
CONVERSE
MCQUEENEY
UNIVERSAL CITY
UHLAND
DOMINION
KYLE
CANYON CITY
CASTLE HILLSWINDCREST
MARTINDALE
FISCHER
SHAVANO PARK
LEON VALLEY
LULING
HILL COUNTRY VILLAGEMARION
HOLLYWOOD PARK
CROSS MOUNTAIN
NEW BERLIN
FAIR OAKS RANCH
NIEDERWALD
32
6
5
153
12
113
57
*A
CIBOLO CR YORK C R
PLUM C R
SALAD
O CR
SAN MARCOS R
GUADALUPE R
Mill
Cre
ek
Curry Creek
Yo rk Creek
Nash Creek
Allig ator Creek
BL ANC
O R
SIN K CR
Geronimo Creek
PLUM CR, CLEAR F K
Mud C
re
ek
PLUM CR, W FK
Carpe r s Creek
E lm Creek
DRY COMA
L CR
Bear Cr eek
Lo ng Creek
LEON
CR
Beite
l Cre
ek
Indian Cre ek
Lewis Creek
Panther Springs Creek
Wol f Cre ek
Cal
lihan
Cre
ek
Rebecca Creek
S a u l Creek
Boggy Creek
Youngs Cre ek
Isaa
c Cre
ek
Cypress Cree k
Dickerson Creek
Walnut B
ranch
Darst C
r eek
High smith Creek
Potter Creek
Clear Fork
Walter C
reek
Hon
ey C
reek
Long
Bra
nch
Smi th
C re
ek
P leasant Valley Creek
Dry Branch
Swin
e Cre
ek
Spr
ing
Bra n
ch
Raw
ls Creek
Pant
her C
reek
Meusebach Creek
C
ordell Cre
ek
Dry Bear Creek
Krause Creek
Hanz C
reek Mountain Creek
Can
tau C
reek
Saw
log
Cre
ek
Caney Creek
Dutch Branch
Ja
cobs C
reek
Ran
dolp
h C
reek
Bru
sh
y Creek
Santa Clara Creek
Olmos Creek
Dead
m an Creek
Rocky C
reekPin Oak C
reek
Dry
San
ta C
lara
Cre
ek
Four
mile Cr ee
k
Cot
to
nwood Creek
Women Hollow Creek
Mesquite Creek
Buzz
ard
Cre
ek
Water Hole Creek
Schultz Creek
Turk
ey C
reek
Dee
p C
reek
Elm Creek
Elm
Cre
ek
GUA
DALUPE R
Elm Creek
Long Creek
Elm C
reek
Panther Creek
CANYON LAKE
STRATEGIC MASTER PLAN FOR THE PETRA REGION - Bird Habitat
NEW BRAUNFELS STORMWATER MASTER PLAN
Data Sources: City of New Braunfels, TX Commission for Environmental Quality, TX DOT, USGS
[0 20,000 40,000 60,00010,000Feet
HYDROLOGY AND FLOODPLAINS - DRAFT 1.27.11
0.1 Pct Annual Chance Flood Hazard (100 - year)
Floodway
Flood Damaged Homes June 2010
Counties
City of New Braunfels
Other City Boundary
New Braunfels ETJ
Municipal Solid WasteRailroad
HAYS COUNTY
GUADALUPE COUNTY
KENDALL COUNTY
COMAL COUNTY
CALDWELL COUNTY
BLANCO COUNTY
BEXAR COUNTY
BULVERDE
Phase I | 31
Existing Conditions Maps
o
SAN ANTONIO
SEGUIN
SAN MARCOS
SCHERTZ
LOCKHART
CIBOLO
WIMBERLEY
SELMA
TIMBERWOOD PARK
LIVE OAK
GARDEN RIDGE
CONVERSE
MCQUEENEY
UNIVERSAL CITY
UHLAND
DOMINION
KYLE
CANYON CITY
CASTLE HILLSWINDCREST
MARTINDALE
FISCHER
SHAVANO PARK
LEON VALLEY
LULING
HILL COUNTRY VILLAGEMARION
HOLLYWOOD PARK
CROSS MOUNTAIN
NEW BERLIN
FAIR OAKS RANCH
NIEDERWALD
32
6
5
153
12
113
57
*A
CIBOLO CR YORK C R
PLUM C R
SALAD
O CR
SAN MARCOS R
GUADALUPE R
Mill
Cre
ek
Curry Creek
York Creek
Nash Creek
Allig ator Creek
BL AN
CO
R
SIN K CR
Geronimo Creek
PLUM CR, CLEAR F K
Mud C
re ek
PLUM CR, W FK
Carpe r s Creek
E lm Creek
DRY COMA
L CR
Bear Cr eek
Lo ng Creek
LEO
N C
R
Beite
l Cre
ek
Indian Creek
Lewis Creek
Panther Springs Creek
Wol f Cre ek
Cal
lihan
Cre
ek
Rebecca Creek
S a u l Creek
Boggy Creek
Youngs Cre ek
Isaa
c Cre
ek
Cypress Cree k
Dickerson Creek
Walnut B
ranch
Darst C
reek
High smith Creek
Potter Creek
Clear Fork
Walter C
reek
Hon
ey C
reek
Long
Bra
nch
Sm
ith Cre
ek
P leasant Valley Creek
Dry Branch
Sw
ine
Creek
Spr
ing
Bran
ch
Raw
ls Creek
Pant
her C
reek
Meuseb ach Creek
C
ordell Cree
k
Dry Bear Creek
Krause Creek
Hanz C
reek Mountain Creek
Can
tau C
reek
Saw
log
Cre
ek
Caney Creek
Dutch Branch
Ja
cobs C
reek
Ran
dolp
h C
reek
Bru
sh
y Creek
Santa Clara Creek
Olmos Creek
Dead
m an Creek
Rocky C
reekPin Oak Creek
Dry
San
ta C
lara
Cre
ek
Four
mile
Cr eek
Cot
to
nwood C
reek
Women Hollow Creek
Mesquite Creek
Buzz
ard
Cre
ek
Water Hole Creek
Schultz Creek
Turk
ey C
reek
Dee
p C
reek
Elm
Cre
ek
Elm Creek
Elm Creek
Elm C
reek
GUA
DALUPE R
Long Creek
Panther Creek
GUADALUPE RIVER BASIN
SAN ANTONIO RIVER BASIN
NEW BRAUNFELS
CANYON LAKE
§̈¦35
§̈¦10
§̈¦410
§̈¦10
£¤281
£¤90
£¤183
£¤90
UV46
UV123
UV80
UV1604
UV21
UV142
UV345
UV82
UV337
UV368
UV537
§̈¦35J
UV123B
UV46C
STRATEGIC MASTER PLAN FOR THE PETRA REGION - Bird Habitat
NEW BRAUNFELS STORMWATER MASTER PLAN
Data Sources: City of New Braunfels, TX Natural Resources Information System, TX DOT, USGS, TCEQ, City of San Antonio
[0 20,000 40,000 60,00010,000Feet
REGIONAL WATERSHEDS - DRAFT 1.27.11
Watershed Boundary
Guadalupe River Basin
San Antonio River Basin
Watershed Study Area
Stream Segment
Dam
Counties
City of New Braunfels
Outlying Cities
New Braunfels ETJ
ETJ Outlying Cities
Municipal Waste Sites
Railroad
HAYS COUNTY
GUADALUPE COUNTY
KENDALL COUNTY
COMAL COUNTY
CALDWELL COUNTY
BLANCO COUNTY
BEXAR COUNTY
BULVERDE
GUADALUPE RIVER BASIN
SAN ANTONIO RIVER BASIN
COLORADORIVER BASIN
BRAZOSRIVER BASIN
NUECESRIVER BASIN
LAVACARIVER BASIN
SAN ANTONIO- NUECESCOASTAL RIVER BASIN
WATERSHED STUDY AREA
Phase I | 33
Existing Conditions Maps
o
SAN ANTONIO
SEGUIN
SAN MARCOS LOCKHART
SCHERTZ
TIMBERWOOD PARK
CIBOLO
WIMBERLEY
LIVE OAK
GARDEN RIDGE
CONVERSE
SELMA
MCQUEENEY
UNIVERSAL CITY
UHLAND
DOMINION
KYLE
CANYON CITY
CASTLE HILLS WINDCREST
MARTINDALE
FISCHER
SHAVANO PARK
LEON VALLEY
LULING
HILL COUNTRY VILLAGEMARION
HOLLYWOOD PARK
CROSS MOUNTAIN
NEW BERLIN
FAIR OAKS RANCH
NIEDERWALD
*A
C IBOLO CRYOR
K C R
PLUM C R
S ALADO CR
SAN MARCOS R
GUADALUPE R
Mill
Cre
ek
Curry Creek
York Creek
Nash Creek
Allig ator Creek
BL ANCO R
SIN K CR
Geronimo Creek
PLUM CR, CLEAR F K
Mud C
re ek
PLUM CR, W FK
Carpe r s Creek
E lm Creek
DRY COMA
L CR
Bear Cr eek
Lo ng Creek
LEO
N C
R
Beite
l Cre
ek
Indian Creek
Lewis Creek
Panther Springs Creek
Wol f Cre ek
Cal
lihan
Cre
ek
Rebecca Creek
S a u l Creek
Boggy Creek
Isaa
c Cre
ek
Cypress Cree k
Dicke rson Creek
Walnut B
ranch
Darst C
reek
High s mith Creek
Potter Creek
Clear Fork
Walter C
reek
Hon
ey C
reek
Long
Bra
nch
Sm
ith C
reek
P leasant Valley Creek
Dry Branch
Swin
e Cre
ek
Spr
ing
Bran
ch
Raw
ls Creek
Pant
her C
reek
Meuseb ach Creek
C
ordell Cre
ek
Dry Bear Creek
Krause Creek
Hanz C
reek Mountain Creek
Can
tau
Creek
Saw
log
Cre
ek
Caney Creek
Dutch Branch
Ja
cobs C
reek
Ran
dolp
h C
reek
Brus
hy Creek
Santa Clara Creek
Olmos Creek
Willow Sp rings Creek
Dead
m an Creek
Blieder's Creek
Rocky C
reekP in Oak C
reek
Dry
San
ta C
lara
Cre
ek
Four
mile
Cr eek
Cot
to
nwood C
reek
Women Hollow Creek
Mesquite Creek
Buzz
ard
Cre
ek
Water Hole Creek
Schultz Creek
Turk
ey C
reek
Dee
p C
reek
Elm
Creek
Elm
Cre
ek
GUA
DALUPE R
Long CreekPanther Creek
CANYON LAKE
NEW BRAUNFELS
STRATEGIC MASTER PLAN FOR THE PETRA REGION - Bird Habitat
NEW BRAUNFELS STORMWATER MASTER PLAN
Data Sources: City of New Braunfels, TX Natural Resources Information System, TX DOT, USGS, State of Texas, TX Comm Env Quality
[0 20,000 40,000 60,00010,000Feet
LAND COVER - DRAFT 1.27.11
Stream Segment
Watershed Study Area
Counties
City of New Braunfels
ETJ New Braunfels
Municipal Solid Waste
Railroad
BULVERDE
Open Water
Developed Low Intensity
Developed Medium Intensity
Developed High Intensity
Barren Land
Deciduous Forest
Evergreen Forest
Mixed Forest
Scrub/Shrub
Grassland/Herbaceous
Pasture/Hay
Cultivated Crops
Woody Wetlands
Emergent Herbaceous Wetlands
Developed Open Space
Phase I | 35
Existing Conditions Maps
o
SAN ANTONIO
SEGUIN
SAN MARCOS
SCHERTZ
LOCKHART
CIBOLO
WIMBERLEY
SELMA
TIMBERWOOD PARK
LIVE OAK
GARDEN RIDGE
CONVERSE
MCQUEENEY
UNIVERSAL CITY
UHLAND
DOMINION
KYLE
CANYON CITY
CASTLE HILLSWINDCREST
MARTINDALE
FISCHER
SHAVANO PARK
LEON VALLEY
LULING
HILL COUNTRY VILLAGEMARION
HOLLYWOOD PARK
CROSS MOUNTAIN
NEW BERLIN
FAIR OAKS RANCH
NIEDERWALD
*A
CIBOLO CR YORK C R
PLUM C R
SALAD
O CR
SAN MARCOS R
GUADALUPE R
Mill
Cre
ek
Curry Creek
York Creek
Nash Creek
Allig ator Creek
BL ANC
O R
SIN K CR
Geronimo Creek
PLUM CR, CLEAR F K
Mud C
re ek
PLUM CR, W FK
Carpe r s Creek
E lm Creek
DRY COMA
L CR
Bear Cr eek
Lo ng Creek
LEO
N
CR
Beite
l Cre
ek
Indian Creek
Lewis Creek
Panther Springs Creek
Wolf Cre ek
Cal
lihan
Cre
ek
Rebecca Creek
S a u l Creek
Boggy Creek
Youngs Cree k
Isaa
c Cre
ek
Cypress Cree k
Dickerson Creek
Walnut B
ranch
Darst C
reek
High s mith Creek
Potter Creek
Clear Fork
Walter C
reek
Hon
ey C
reek
Long
Bra
nch
Sm
ith C
re
ek
P leasant Valley Creek
D ry Bra nch
Sw
ine
Creek
Spr
ing
Bran
ch
Raw
ls Creek
Pant
her C
ree k
Meuseb ach Creek
C
ordell Cree
k
Dry Bear Creek
Krause Creek
Hanz C
reek Mountain Creek
Can
tau C
reek
Saw
log
Cre
ek
Caney Creek
Dutch Branch
Ja
cobs C
reek
Ran
dolp
h C
reek
Bru
sh
y Creek
Santa Clara Creek
Olmos Creek
Dead
m an Creek
Blieder's Creek
Rocky C
reekP in Oak Creek
Dry
San
ta C
lara
Cre
ek
Four
mile
Cr eek
Cot
to
nwood C
reek
Women Hollow Creek
Mesquite Creek
Buzz
ard
Cre
ek
Water Hole Creek
Schultz Creek
Turk
ey C
reek
Dee
p C
reek
Elm
Cre
ek
Elm Creek
Elm Creek
Elm C
reek
GUA
DALUPE R
Long CreekPanther Creek
§̈¦35
§̈¦10
§̈¦410
§̈¦10
£¤281
£¤90
£¤183
£¤90
UV46
UV123
UV80
UV1604
UV21
UV142
UV345
UV82
UV337
UV368
UV537
CANYON LAKE
§̈¦35H
§̈¦35J
UV123B
UV46C
STRATEGIC MASTER PLAN FOR THE PETRA REGION - Bird Habitat
NEW BRAUNFELS STORMWATER MASTER PLAN
Data Sources: City of New Braunfels, TX Natural Resources Information System, TX DOT, USGS, TX Comm Env. Quality
[0 20,000 40,000 60,00010,000Feet
TREE CANOPY - DRAFT 1.27.11
Stream Segment
Watershed Study Area
Counties
City of New Braunfels
ETJ New Braunfels
Municipal Solid Waste
HAYS COUNTY
GUADALUPE COUNTY
KENDALL COUNTY
COMAL COUNTY
CALDWELL COUNTY
BEXAR COUNTY
BULVERDE
1% - 49% Canopy Cover
50% - 99% Canopy Cover
100% Canopy
Phase I | 37
Existing Conditions Maps
STRATEGIC MASTER PLAN FOR THE PETRA REGION - Bird Habitat
NEW BRAUNFELS STORMWATER MASTER PLAN
Data Sources: City of New Braunfels, TNRIS, TXDOT, USGS
[0 10,000 20,000 30,0005,000Feet
SOILS - DRAFT 1.27.11
Stream Segment
Dam
Counties
City Boundary
EJT Boundary
Municipal Solid Waste
Railroad
COMAL COUNTY
GUADALUPE COUNTY
Phase I | 39
Phase I | 41
Existing Code and Planning DocumentsExisting land use and development code was reviewed for stormwater related issues such as stream setback, impervious cover-age, parking requirements, landscape, water course protection, water harvesting/ conser-vation, and reuse/ recharge� In addition, City standards on landscaping, maintenance of parks and roads right of ways were re-viewed� Finally, existing studies done on wa-tersheds in New Braunfels, including EARIP, Alligator Creek Watershed Study and TCEQ Edward’s Aquifer Stormwater Regulations were reviewed to incorporate components or ensure compatibility�
Review of these reports and documents were compiled into a excel database spreadsheet and tracked by specific code and page� This detailed data will be used as recommendations are made for the Storm-water Management Plan and Drainage Con-trol Manual updates to ensure compatibility among City code, regulations and previous studies findings.
Below is a summary of the documents reviewed and application to the Stormwater Management Plan and DCM�
Document SummariesTPDES Phase II Existing Stormwater Management1� The New Braunfels TPDES Phase II -
Storm Water Management Plan ad-dresses the Texas Pollutant Discharge Elimination System (TPDES) program that designates New Braunfels as sub-ject to regulation under Phase II storm water permitting requirements� This document contains valuable data that can relate to metrics�
Water Quality Documents2� TCEQ: Complying with the Edwards
Aquifer Rules - Technical Guidance on Best Management Practices was reviewed for the requirements that ad-dress activities that threaten the water quality in the Edwards Aquifer, including aquifer fed wells and springs and upland drainage areas� This document outlines the minimum requirements for water quality but the City of New Braunfels can be more stringent if desired�
3� The Edwards Aquifer Authority Act was reviewed because the EAA may develop their own best management practices for stormwater within Edwards Aquifer zones� For now the TCEQ is the main resource for this information�
4� Comal River Review shows a decrease in levels of bacterial contamination from the late 1990s to the mid 2000s� There was an increased reporting of elevated levels in 2008 and 2009�
5� E-Coli Samples were reviewed for base-line e-coli conditions�
6� High Priority Restoration and Mitigation Actions for the Comal and San Marcos Springs Ecosystems was reviewed for information on the restoration and mitigation projects in the New Braunfels area�
Code Review Summary
New Braunfels Stormwater Management Strategy | New Braunfels, Texas42 | Phase I
Code Review Summary
11� Ordinance Chapter 118: The Platting Ordinance addresses water, sewer, drainage facilities and flood hazards for subdivisions� This document was re-viewed for requirements related to drain-age and runoff� Natural waterways and channels should be used to carry runoff, whenever practical� Landscape fea-tures are encouraged in locations where future street improvement, sidewalks, drainage improvements or utilities would not be located�
12� Ordinance Chapter 130: The Pub-lic Utilities Ordinances is the section implementing the TPDES and discusses wastewater and discharge� Illicit dis-charge is also regulated in Chapter 110 and 142 of the Ordinance Code�
13� Ordinance Chapter 143: The Drainage System Ordinance was reviewed for minimum building requirements relating to drainage improvements, setbacks, and impact analysis� The ordinance states that owners must provide a study of downstream impact and the city’s drainage system’s capacity to accept stormwater� Municipal Drainage Utility System Ordinance is reviewed in more detail as part of the more specific DCM review following this code review�
City Ordinances and Permitting7� Ordinance Chapter 14: The Building
Code and Building Regulation Ordi-nance was review for consistency with best stormwater management practices� Building permit requirements for fences specifically should not obstruct flows up to and including the 100-year peak flow.
8� Ordinance Chapter 58: The Flood Dam-age Prevention Ordinance was updated in 2010 and was reviewed to confirm regulations for development in flood-ways and for floodway variance. The document covers variance procedures, flood hazard reduction, residential con-struction, non-residential construction, enclosures and manufactured homes in designated in the 2009 Flood Insurance Rate Maps and/or Flood Boundary-Floodway Maps (FIRM and/or FBFM) as Floodways or FEMA Flood Zone A� The City of New Braunfels Building Depart-ment provided additional outreach after the 2010 flood to help homeowners navigate the permitting process for repairs due to flood damage.
9� Ordinance Chapter 83: The Parks and Recreation Ordinance was reviewed for information relating to river access and fees� It is an offense and a violation of this section for any person to enter any lake, river, stream or waterway by jump-ing, diving or doing any other dangerous act on or off any bridge, street, highway, appurtenance, publicly owned land or public right-of-way�
10� Ordinance Chapter 114: The Streets and Sidewalks Ordinance was reviewed for potential opportunities to incorpo-rate Low Impact Design stormwater techniques into the road networks� Landscaping in street right-of-ways is regulated by the City and NBU� Efforts should be taken to ensure LID type of vegetation is allowed and supported�
Phase I | 43
16� Geronimo and Alligator Creek Protec-tion Strategies was reviewed for urban stormwater and wastewater manage-ment practices that could provide baseline material for metrics� Outreach education programs and funding part-nerships are explored as mechanisms to protect water quality� Nutrient man-agement training to interested parties is recommended� Sanitary sewers are proposed for areas served by septic systems�
17� Stream Assessment Deliverable 01 provides the methodology from which stream assessments will be conducted� It provides basic rules and guidelines for assessment teams� This document was reviewed for best management prac-tices and techniques�
18� River Expenses were reviewed for ac-tual costs of river expenditures including police, streets, parks, management, lit-ter, and anti-litter campaigns� This data is useful for baselines of metrics�
19� The Impact of Tourism on Comal County measures the economic impact of tourism, which includes a specific measurement of river tourism� Obvi-ous economic benefits are outlined as well as non-measurable impacts� The conclusion suggests that spending deci-sions influencing this sector be seen in a broad context� The data in this docu-ment is useful for baselines of metrics�
20� New Braunfels CIP Costs and Proposed Projects document was reviewed for understanding of previous drainage projects completed by the City of New Braunfels� Consideration for future projects should be made for potential increased costs due to stricter regula-tion sin the 2012-2017 FM MS4 imple-mentation�
14� Ordinance Chapter 144: The Zoning Ordinance was reviewed for potential metrics and conflicts to stormwater. Topics reviewed include common open space, overhang easement, roof runoff, construction and pollution prevention and drainage and fences� The following sections relate to stormwater manage-ment�
• Section 5�1 Parking paving require-ments may create additional impervi-ous cover�
• Section 5�2 Landscaping should take into consideration stormwater LID features� Fences may not be lower in elevation than the highest point on either side of a drainage easement�
• Section 5�8 Agriculture uses should have some regulation specific to drain-age ways�
• Section 5�20 The use of human-scaled elements on buildings could be rain harvesting�
Watershed Related Studies15� The Watershed Management Fee
Implementation Study (2003) was reviewed for potential policies and the methodology for applying costs as-sociated with drainage and stormwater related expenses� This study recom-mended a fee based upon impervious cover for parcels for watershed and stormwater management and identified potential funding sources� In April 2011, the City of New Braunfels proposed a potential fee to the City Council and supported the creation of the Watershed Advisory Committee�
Code Review Summary
New Braunfels Stormwater Management Strategy | New Braunfels, Texas44 | Phase I
DCM ReviewA detailed review of the existing Drain-age Control Manual was completed by the consultants and City Staff in January and March. This review identified key issues
related to the stormwater plan for New Braunfels and prioritization of completing changes� The detailed changes outlined in this review are below�
DCM Review
TOPIC Prior� PG # SECT TABLE DW/LAN COMMENT STAFF COMMENTPage Numbering
0 69 1�0 Why does page numbering start with page 69?
Variance from DCM requirements
3 69 1�1 B) Consider elevating variances from DCM to higher than City Engineer
Strongly disagree� Ordinance should contain requirements which are not subject to interpretation and City Engineer should be allowed to interpret this document�
Type 1 Development Requirements
3 70 2�1�1 Require detention or fee-in-lieu for Type 1 Development
Type 2 Development Requirements
3 70 2�1�2 Require detention or fee-in-lieu for Type 2 Development
Digital Submissions
3 70 2�1 Require digital submission for some or all drainage report� Format to be worked out� Especially useful for drainage easement (aka future maintenance) locations�
Design Storm Frequencies
2 71 2�1�3 B�1 Add 2-yr storm in range of design storm frequency requirements
50% storm in range of design storm frequency requirements
Drainage Mitigation Design Points
2 71 2�1�3 B�1 Add language that specifies mitigating peak flow downstream beyond requestor's property line some points TBD
Water Quality 3 72 2�2 Update language to include Ph II, MS4 planned updates
Stream Setback 2 72 2�3 A Create a stream and riparian corridor setback requirement� Setback limits can very per watershed size of creek
Tree Mitigation 3 72 2�3 B Require tree mitigation to some degree� Keep it simple, perhaps a fixed replacement ratio for native trees above a certain size�
Tree mitigation really belongs somewhere else? Why have it as part of drainage?
Land Use Definition
1 72 2�4 Remove requirement to use 1997 aerial� Replace with latest available aerial (and require aerial submission with date of aerial provided)
Need to keep reference to old aerial� In fact, 1997 is not old enough to capture "pre-development" conditions�
Drainage Mitigation Design Points
2 72 2�5�1�A-C Expand on discussion to not transfer problem downstream� Explain in more detail how calculations should be performed further downstream to prove it�
Design Storm Frequencies
2 73 2�5�2�A Add 2-yr storm in range of design storm frequency requirements
50% storm in range of design storm frequency requirements
Phase I | 45
DCM Review
TOPIC Prior� PG # SECT TABLE DW/LAN COMMENT STAFF COMMENTStormwater Infiltration
3 73 2�5�2�D Look for ways to promote responsible infiltration to the EARZ�
Lot Basins and slopes
0 73 2�5�2�F Don't understand criteria
Stormwater retention or detention facilities
74 2�5�2�G�4 Add a freeboard requirement
Pond Side Slopes
3 74 2�5�2�G�6 Change 2�5:1 max to 3:1 max, even consider requiring flatter over a certain depth
Culvert Outlet Erosion
3 75 2�5�3�E Define maximum velocity or shear requirements
Sediment Accumulation in Culverts
3 75 2�5�3�F Define minimum slope and/or minimum velocity to avoid sedimentation
Minimum Culvert Size
3 75 2�5�4�A�4 Change minimum culvert size to 18"
Storm Drain Systems
1 76 2�5�5�A�2 Do we want to allow HDPE pipe?
Storm Drain Systems
1 76 2�5�5�A�7 300 foot spacing conflicts with Table 8�2
Channels 3 77 2�5�6�A Reinforce from "encourage" to "require"
Reinforce from "encourage" to "require"
Channels 1 77 2�5�6�B Does the language about encroachment in FEMA floodways really belong here?
Channels 3 78 2�5�6�B�3 Consider reduction of 12' maintenance access
Sediment Fencing
0 78 2�5�6�C�3 What criteria does the City use to qualify the use of fencing?
What criteria does the City use to qualify the use of fencing? - there isn't one�
Channel Design 3 78 2�5�6�E Improve language with more specifics
Diverse Channel Design
3 78 2�5�6�F Improve language with more specifics
Maintenance 3 79 2�7 Identify maintenance standardsFreeboard requirements
3 79 Table 2-3
Update reference to wave action and SPF for channels
Freeboard requirements
3 79 Table 2-3
Explain difference between channel and swale/ditch (watershed size?) or combine to one row
CAD requirement
3 80 2�8�A Update AutoCAD 14 reference
Erosion Hazard Setback
2 83 2�9 Update write-up with more detail and specific setback requirements� Remove bank stabilization option�
Finished Floor Elevation
1 83 2�10 Omit entire section� Building Official sets building slab elevation�
Ordinance vs� Manual
1 84 3�0 Update reference to Appendix D
New Braunfels Stormwater Management Strategy | New Braunfels, Texas46 | Phase I
DCM Review
TOPIC Prior� PG # SECT TABLE DW/LAN COMMENT STAFF COMMENTRainfall Data 2 85 4�1 B Table
4-1 (IDF) Coeff�
Update with new USGS data
Software 1 85 4�4 Change HEC-1 reference to HEC-HMS
Standard Project Precipitation (SPP)
3 85 4�3 Suggest removing any definitions here and only referring to USACE documentation
Rainfall Data 2 86 4�1 B Table 4-2 (IDF) Coeff�
Update with new USGS data (consider removing/combining with Table 4-1)
Rainfall Data 2 86 4�4 Table 4-3 (DDF)
Update with new USGS data
Proposed development accounting for fully developed upstream conditions
2 87 5�2 Further define this criteria and "fully developed conditions"� Should project drainage assume no upstream detention?
Use of Rational Method
3 87 5�3 Reduce Rational method down to 100ac or less
Runoff Coefficients
2 88 5�3�2 Don't use ASCE 1969 reference for runoff coefficients. Use more recent TxDOT, FHWA, ASCE, or other reference
Runoff Coefficients
2 88 5�3�2 Table 5-1
Add 50-yr K=1�2 Why? City doesn't require use of 50-year flow.
Time of Concentration
2 89 5�3�3 Update Shallow Concentrated Flow Equation
Errata sheet, sheet flow formula provides wrong units
Time of Concentration
2 89 5�3�3 Consider Kirby-Kirpitch or Lamar research for Tc
Look at method of calculating Tc - comments that the method described provides extremely high times
Antecedent Moisture
2 90 5�4�1 B Why AMC III? Use AMC II or Hailey & McGill adjustment map
Mistake in manual
Manning’s “n” for Overland Flow and Shallow Concentrated Flow
1 90 Table 5-4
Look at updating TR-55 provides a better detailed Manning's n table
Soil Types 1 90 5�4�1 B Eliminate reference to Tom Green County, TX� Consider use of NRCS-WSS
SCS/NRCS Unit Hydrograph
1 92 5�4�1�C Spelling "computed"
Use of FEMA flows
1 90 5�4�B Delete this section� New Braunfels should not make a blanket statement to not use FEMA flows.
Hydrologic Software
1 94 5�6 Update Hydrologic Computer Programs
Phase I | 47
DCM Review
TOPIC Prior� PG # SECT TABLE DW/LAN COMMENT STAFF COMMENTStreet Flow 3 96-100 6�0 Consider simplifying this section
with fewer equations and permutations of crown
Flow Calculations for Parabolic Street Sections
1 97 6�3�2 Refer to table 6-4, no such table exists
Inlet Design 3 101-108 7�0 Consider deleting much of this section, keep only "local" inlets and otherwise refer to TxDOT/FHWA/other
Storm Sewer Design Size
3 109 8�1 A Why sized for full flow?
Maximum Manhole Spacing
3 110 8�1 Table 8-2
Reduce maximums� Consider using TxDOT or other reference
Maximum Velocity in Storm Drains
3 110 8�1 Table 8-3
Update velocity maximums
Critical Depth Calculation
3 111 8�1 Eq� 8-2 Yc should be solved for Channel not pipe
Super Critical Flows
3 116 9 Provide more design criteria for super critical flows
General "Weeds"
1 116 9 Remove reference to "weeds" throughout document
Channel Design 3 116 9 Table 9-1
Add native vegetation coefficients and consider shear design
Energy Dissipation
1 127 10�6�B Verify formula (Eq� 10-6)
CN minimums for detention
3 128 11�1�C Either delete this section or provide more clarity and justification for it
Minimum Pond Floor Slope
3 128 11�2�A�1 Increase minimum pond slope from 0�25% to 1�0%
?
Security Fencing
1 128 11�2�4 Fix typo
Maintenance Access
3 128 11�2�5 Consider reduction of 12' maintenance access
2�5�6�B�3 also
Silt Removal 3 128 11�2�7 Clearly define methods for silt removal based on vegetation
Outlet Structure Design Equations
3 129 11�3 Update Outlet structure design equations
Playa Lakes 1 129 11�4 Strike this entire sectionLakes, Dam and Levees
1 130 12�0 Suggest some structural/geotechnical requirement for these designs as well
Levees 3 133 12�2 Strongly discourage use of levees by making conservative criteria
E&S During Construction
1 135 13 Update E&S for Construction to refer to new TCEQ / EPA regulations
References to TNRCC
1 general Update References to TNRCC to TCEQ
TOPIC Prior� PG # SECT TABLE DW/LAN COMMENT STAFF COMMENTDrainage Easement Dedication
3 general Require drainage easement dedication for "fully developed, undetained" floodplain
Pond Design 3 general Need criteria for pond design and existing vegetation
Vegetative Cover
3 general Need criteria for proposed vegetation
LID 3 general Need to add a LID section
DCM Review