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


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�


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�



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�

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

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



COLORADORIVER BASIN

BRAZOSRIVER BASIN

NUECESRIVER BASIN

LAVACARIVER BASIN

SAN ANTONIO- NUECESCOASTAL RIVER BASIN

WATERSHED STUDY AREA

Phase I | 9


o

32

6

5

153

12

113

57

*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


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


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


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



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


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



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


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



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


Railroad

COMAL COUNTY

GUADALUPE COUNTY

Phase I | 15


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


HOLLYWOOD PARK

CROSS MOUNTAIN

FAIR OAKS RANCH

OLMOS PARKBALCONES HEIGHTS

CANYON LAKE

NEW BRAUNFELS



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


Counties


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


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




[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


Railroad

COMAL COUNTY

GUADALUPE COUNTY

Phase I | 19


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



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


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



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


Railroad

COMAL COUNTY

GUADALUPE COUNTY

Percent Imperviousness1% - 49%50% - 99%

100%

Phase I | 23


Phase I | 24


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




[0 8,100 16,200 24,3004,050Feet

BUILDING FOOTPRINTS - DRAFT 08/25/11

Stream Segment

Counties


BULVERDE

BuildingFootprints

Phase I | 25


Phase I | 26


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




[0 8,400 16,800 25,2004,200Feet

PARKS AND OPEN SPACE - DRAFT 08/25/11

Stream Segment

Counties


BULVERDE

Parks_BNDY

Phase I | 27


Phase I | 28


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




[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


Railroad

COMAL COUNTY

GUADALUPE COUNTY

Phase I | 29


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


MARTINDALE

FISCHER

SHAVANO PARK

LEON VALLEY

LULING


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


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


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



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


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


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


MARTINDALE

FISCHER

SHAVANO PARK

LEON VALLEY

LULING


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


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


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



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



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


Stream Segment

Dam

Counties


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



COLORADORIVER BASIN

BRAZOSRIVER BASIN

NUECESRIVER BASIN

LAVACARIVER BASIN

SAN ANTONIO- NUECESCOASTAL RIVER BASIN

WATERSHED STUDY AREA

Phase I | 33


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


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


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


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




[0 20,000 40,000 60,00010,000Feet

LAND COVER - DRAFT 1.27.11

Stream Segment


Counties


ETJ New Braunfels


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


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


MARTINDALE

FISCHER

SHAVANO PARK

LEON VALLEY

LULING


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


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


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



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


Counties


ETJ New Braunfels


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




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


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


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


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


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